Archives of Civil and Mechanical Engineering最新文献

Seismic fragility and financial loss analysis of building clusters on the basis of probability and empirical estimation strategies 基于概率与经验估计策略的建筑集群地震易损性与经济损失分析

IF 4.4 3区工程技术

Archives of Civil and Mechanical Engineering Pub Date : 2025-05-26 DOI: 10.1007/s43452-025-01234-2

Si-Qi Li

{"title":"Seismic fragility and financial loss analysis of building clusters on the basis of probability and empirical estimation strategies","authors":"Si-Qi Li","doi":"10.1007/s43452-025-01234-2","DOIUrl":"10.1007/s43452-025-01234-2","url":null,"abstract":"<div><p>The effects of earthquakes of multiple intensities on engineering buildings directly cause many structural failures, economic losses, and displacement. Furthermore, various building structures exhibit diverse seismic vulnerabilities and risk characteristics under different temperatures. Structural earthquake vulnerability and loss of typical engineering structures under multiple temperatures and low- to medium-seismic intensities have been proposed to study seismic vulnerability and loss estimation models considering probabilistic seismic risk and temperature effects. Temperature models were established for nine typical cities (earthquake-prone regions) within Yunnan Province. An innovative model for estimating the number of outdoor shelters considering the seismic fragility of buildings and the dominance of temperature fields has been proposed. Using empirical and mathematical statistical techniques, the developed model was validated and analysed via four types (adobe and wooden (AW) buildings, brick and timber (BT) structures, multistory masonry (MM) structures, and reinforced concrete frame (RCF) structures) of structural survey data (31,356.347 m<sup>2</sup>) from two destructive earthquakes (Dayao-N and Dayao-L) that occurred in Dayao County, Yunnan Province, China, on July 21, 2003, and October 16, 2003. Using probability risk and nonlinear regression methods, seismic loss and risk index curves and economic loss distributions were established for four building clusters considering empirical and temperature effects. Using the method of cumulative estimation of failure and loss, seismic loss and risk models were generated. A statistical analysis of the distribution of the number of outdoor shelters considering a dataset of actual damage to four types of buildings under different temperatures and earthquake intensities was performed. An updated seismic risk membership index curve was generated for four buildings on the basis of temperature and moderate- to low-intensity measures.</p></div>","PeriodicalId":55474,"journal":{"name":"Archives of Civil and Mechanical Engineering","volume":"25 4","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144135383","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The deformation law and interfacial bonding mechanism of bimetallic hollow shafts cross-wedge rolling with mandrel 双金属空心轴楔横轧的变形规律及界面结合机理

IF 4.4 3区工程技术

Archives of Civil and Mechanical Engineering Pub Date : 2025-05-26 DOI: 10.1007/s43452-025-01201-x

Le Zhu, Chaoyang Sun, Jing Zhou, Baoyu Wang, Long Ma, Xuan Wang, Ning Liu, Jialong Lu

{"title":"The deformation law and interfacial bonding mechanism of bimetallic hollow shafts cross-wedge rolling with mandrel","authors":"Le Zhu, Chaoyang Sun, Jing Zhou, Baoyu Wang, Long Ma, Xuan Wang, Ning Liu, Jialong Lu","doi":"10.1007/s43452-025-01201-x","DOIUrl":"10.1007/s43452-025-01201-x","url":null,"abstract":"<div><p>The manuscript presents a new manufacturing technology for fabricating bimetallic hollow shafts. Cross-wedge rolling (CWR) bimetallic hollow shafts with mandrels increase hole quality by controlling bore shape and decreasing internal flaws. It also increases the quality of the interface combination. In this study, the interfacial bonding quality and deformation laws are investigated by finite element and experimental with different the relative mandrel diameter. The stress–strain field, metal flow, temperature, and rolling force of the workpiece were analyzed in detail by finite elements. The stress in the deformation zone of the interface is three-way compressive stress, and the radial stress is the most advantageous to the interface welding. Along the direction of thickness, the interfacial stress–strain gradient is observed. As the relative mandrel diameter increases, the maximum outer diameter size of the rolled part increases and the non-circularity increases, and the shear strength increases first and then decreases. The microhardness of interface accessories slightly increases with the increase of mandrel diameter, and peaks and valleys appear on the right and left sides of the interface. According to the results of microstructure, the increase of the diameter of the mandrel is conducive to the improvement of the microhardness and the interface strength, and the grains on both sides of the interface were significantly refined with increasing the relative mandrel diameter. The study’s findings can provide theoretical guidance for the fabrication of the CWR bimetallic hollow shafts.</p></div>","PeriodicalId":55474,"journal":{"name":"Archives of Civil and Mechanical Engineering","volume":"25 4","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144135474","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of steel fibers, polypropylene fibers, and silica fume on the properties of ultra-high-performance geopolymer concrete 钢纤维、聚丙烯纤维和硅灰对高性能地聚合物混凝土性能的影响

IF 4.4 3区工程技术

Archives of Civil and Mechanical Engineering Pub Date : 2025-05-24 DOI: 10.1007/s43452-025-01228-0

Abdullah M. Zeyad, Hassan M. Magbool, Mohammed Mutnbak, Mohamed Amin, Ibrahim Saad Agwa

{"title":"Effect of steel fibers, polypropylene fibers, and silica fume on the properties of ultra-high-performance geopolymer concrete","authors":"Abdullah M. Zeyad, Hassan M. Magbool, Mohammed Mutnbak, Mohamed Amin, Ibrahim Saad Agwa","doi":"10.1007/s43452-025-01228-0","DOIUrl":"10.1007/s43452-025-01228-0","url":null,"abstract":"<div><p>This study investigates the properties of ultra-high-performance geopolymer concrete (UHPGC) incorporating polypropylene fiber (PPF) or steel fiber (St.F) along with silica fume (SF). Various volume fractions of PPF and St.F (0%, 0.5%, 1%, 1.5%, and 2%) were utilized in UHPGC production. To evaluate fresh properties, 20% SF and 30% by weight of the binder were added. Slump flow and mechanical properties were examined through compressive strength (CS), splitting tensile strength (STS), flexural strength (FS), modulus of elasticity (ME), and drying shrinkage (DS). Transport properties were analyzed based on water permeability (WP), chloride permeability (CP), and water sorptivity (WS). The effect of elevated temperatures (200 °C, 400 °C, 600 °C, and 800 °C) on CS was also explored. The results indicated that the mixtures containing 30% SF showed greater strength compared to 20% SF. In addition, the inclusion of fibers enhanced the mechanical properties in a direct relationship with the increase in fiber content. At 28 days, the mixture containing 2% St.F achieved CS, FS, and STS values of 172.8 MPa, 19.9 MPa, and 29.4 MPa, respectively. The mixtures containing 30% SF and without fibers showed the best transport properties, with WP, CP, and WS results of 1.3 × 10<sup>−11</sup> cm/s, 210 Coulombs, and 5.7 × 10<sup>−4</sup> mm/s<sup>0.5</sup>, respectively. The incorporation of fibers contributed to the reduction of drying shrinkage and damage caused by elevated temperatures.</p></div>","PeriodicalId":55474,"journal":{"name":"Archives of Civil and Mechanical Engineering","volume":"25 4","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144125761","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Refined microstructure and mechanical properties of WAAM-fabricated IN-625 alloy through process parameter optimization 通过工艺参数优化，改善了waam制备IN-625合金的组织和力学性能

IF 4.4 3区工程技术

Archives of Civil and Mechanical Engineering Pub Date : 2025-05-23 DOI: 10.1007/s43452-025-01233-3

Ankit Kumar, Mayank Arun Sontakke, Gurminder Singh, Rahul S. Mulik

{"title":"Refined microstructure and mechanical properties of WAAM-fabricated IN-625 alloy through process parameter optimization","authors":"Ankit Kumar, Mayank Arun Sontakke, Gurminder Singh, Rahul S. Mulik","doi":"10.1007/s43452-025-01233-3","DOIUrl":"10.1007/s43452-025-01233-3","url":null,"abstract":"<div><p>This work focuses on the fabrication of Inconel-625 (IN-625) superalloy through wire-arc additive manufacturing (WAAM). Key process parameters, including the table travel speed, DC current, and wire feed rate, were optimized to achieve the desired microstructure and mechanical properties. Microstructural analysis revealed that the layer of the specimen showed fine primary grains transitioning to a dendritic core with a secondary arm structure, with intermetallic phases including Laves phases and Nb-rich gamma-nickel contributing to the observed strength variations. Tensile testing revealed that the samples processed at higher travel speeds exhibited the highest tensile strength along the build direction ~ (494 MPa) and hardness ~ (457 ± 31.55 HV). The effects of WAAM process parameters and mechanisms on these outcomes were critically examined. Optimizing WAAM parameters is crucial for producing IN-625 alloys with refined microstructure, and enhanced strength, making them ideal for heavy-duty applications and advancing additive manufacturing techniques. </p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":55474,"journal":{"name":"Archives of Civil and Mechanical Engineering","volume":"25 4","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144117671","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Nonlinear bending and vibration of FGCNTs cylindrical microshells conveying microfluid under a 2D magnetic field 二维磁场下输送微流体的FGCNTs圆柱微壳的非线性弯曲和振动

IF 4.4 3区工程技术

Archives of Civil and Mechanical Engineering Pub Date : 2025-05-22 DOI: 10.1007/s43452-025-01212-8

Mohammed Sobhy

{"title":"Nonlinear bending and vibration of FGCNTs cylindrical microshells conveying microfluid under a 2D magnetic field","authors":"Mohammed Sobhy","doi":"10.1007/s43452-025-01212-8","DOIUrl":"10.1007/s43452-025-01212-8","url":null,"abstract":"<div><p>This paper presents the nonlinear static bending and nonlinear dynamic analysis of cylindrical microshells conveying microfluid and exposed to a 2D magnetic field. The composite shell is made of a polymer matrix reinforced with functionally graded (FG) carbon nanotubes (CNTs). The CNT dispersion varies across the shell thickness according to a power law. Four types of CNT distributions are examined. To account for the small-size effect using a single material parameter, the modified couple stress theory is applied. Additionally, the small-size effect of the microfluid is considered using the Knudsen number. To model fluid–structure interaction, the Navier–Stokes equation for magnetic-fluid flow is employed. The nonlinear motion equations of the cylindrical microshells conveying fluid are developed using Hamilton’s variational principle. The Galerkin approach is used to convert the motion equations into an algebraic system for static bending and into ordinary differential equations (ODEs) for dynamic analysis. The ODEs are solved using the fourth-order Runge–Kutta method. Numerical results reveal the positive role of fluid flow, CNT reinforcement, and magnetic field on the structural behavior of cylindrical microshells. Furthermore, considering the small-size effects of the structure and fluid leads to a noticeable reduction in the amplitude of the deflection waves.</p></div>","PeriodicalId":55474,"journal":{"name":"Archives of Civil and Mechanical Engineering","volume":"25 4","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144117722","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Concrete crack simulation and its machine learning application in propagation prediction 混凝土裂缝模拟及其机器学习在传播预测中的应用

IF 4.4 3区工程技术

Archives of Civil and Mechanical Engineering Pub Date : 2025-05-22 DOI: 10.1007/s43452-025-01229-z

Thuy Anh Vu Thi, Hiep Tran Dinh, Giang Vu Dinh, Hieu Le Cong, Dat Ngo Dinh, Duc Nguyen Dinh

{"title":"Concrete crack simulation and its machine learning application in propagation prediction","authors":"Thuy Anh Vu Thi, Hiep Tran Dinh, Giang Vu Dinh, Hieu Le Cong, Dat Ngo Dinh, Duc Nguyen Dinh","doi":"10.1007/s43452-025-01229-z","DOIUrl":"10.1007/s43452-025-01229-z","url":null,"abstract":"<div><p>This study introduces an innovative approach for the Automatic Simulation of Concrete Cracks (ASCC), integrating simulation and programming software, as well as its machine learning (ML) application in propagation prediction. The ASCC offers an automated simulation facilitated through a user interface, allowing for seamless adjustment of boundary conditions, including support conditions, geometric sizes, and simulation parameters. The crack propagation data obtained from ASCC are employed to train ML models, the correlation of which with real-world crack is verified on some reputable crack image datasets. Experimental results confirmed the effectiveness of samples generated from the Cantilever simply supported beam in approximating real-world cracks. A comparison with a recent relevant work demonstrated smaller fitting errors on 50% of the examined crack image datasets when approximating real-world samples with the best-fit simulation. Comparative analysis indicates that ASCC is significantly faster than manual intervention, i.e. the time required for a simulation in some boundary support conditions is only 4.5% compared to the processing time of an engineer. This achievement is meaningful in simulation and has potential applications for data-intensive tasks, such as vision-based crack detection using ML or deep learning. This work also highlighted the importance of the number of crack tips, which could lead to overfitting when using ML. </p></div>","PeriodicalId":55474,"journal":{"name":"Archives of Civil and Mechanical Engineering","volume":"25 4","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144117726","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Influence of adding silica sand powder on the macroscopic properties and microscopic pore structures of waste-fired clay brick-based geopolymers 添加硅砂粉对废烧粘土砖基地聚合物宏观性能和微观孔隙结构的影响

IF 4.4 3区工程技术

Archives of Civil and Mechanical Engineering Pub Date : 2025-05-21 DOI: 10.1007/s43452-025-01222-6

Cédric Mbiakop Dieuhou, Gaëlle Ngnie, Jean Jacques Kouadjo Tchekwagep, Barbara Rodrigue Eloundou Mbole, Hervé Kouamo Tchakouté, Zihao Li, Claus Henning Rüscher, Charles Peguy Nanseu-Njiki, Pengkun Hou

{"title":"Influence of adding silica sand powder on the macroscopic properties and microscopic pore structures of waste-fired clay brick-based geopolymers","authors":"Cédric Mbiakop Dieuhou, Gaëlle Ngnie, Jean Jacques Kouadjo Tchekwagep, Barbara Rodrigue Eloundou Mbole, Hervé Kouamo Tchakouté, Zihao Li, Claus Henning Rüscher, Charles Peguy Nanseu-Njiki, Pengkun Hou","doi":"10.1007/s43452-025-01222-6","DOIUrl":"10.1007/s43452-025-01222-6","url":null,"abstract":"<div><p>The task of this research is to examine the behavior of silica sand powder on the macroscopic properties and the microscopic pore structures of non-calcined and calcined waste-fired brick-based geopolymers. In the <i>R</i><sup>3</sup> reactivity test, calcined waste-fired bricks release 460 J/g, while non-calcined waste-fired bricks release 457 J/g. The findings highlight that the compressive strength of waste-fired clay brick-based geopolymers increases from (44.96 ± 1.17) to (54.45 ± 1.73) MPa after the addition of 30 g of silica sand powder. When 40 g of silica sand is added, it decreases from (54.45 ± 1.73) to (50.71 ± 1.69) MPa. The compressive strength rises from (53.16 ± 1.69) to (64.89 ± 1.96) MPa when 10 g of silica sand powder is added to the calcined waste-fired clay brick. It decreases from (64.89 ± 1.96) to (49.04 ± 1.32) MPa if 40 g of silica sand is added. The mercury intrusion porosimetry results demonstrate that the geopolymers contain mesopores and macropores. The range of pore size diameters of the calcined waste-fired clay brick-based reference geopolymer (5–60 nm) is smaller than that of the waste-fired clay brick-based geopolymer (5–94 nm). It was found that the addition of 30 and 10 g of silica sand powder to geopolymers made from non-calcined and calcined waste-fired clay bricks, respectively, tended to increase siloxane chains, convert macropores into inaccessible finer pores.</p></div>","PeriodicalId":55474,"journal":{"name":"Archives of Civil and Mechanical Engineering","volume":"25 4","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144108440","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Quasi-static puncture resistance behaviors of the air cushion fabric structures 气垫织物结构的准静态抗穿刺性能

IF 4.4 3区工程技术

Archives of Civil and Mechanical Engineering Pub Date : 2025-05-21 DOI: 10.1007/s43452-025-01219-1

Junhao Xu, Shanshan Xu, Yingying Zhang, Yang Ji, Shuhuan Fei, Yushuai Zhao

{"title":"Quasi-static puncture resistance behaviors of the air cushion fabric structures","authors":"Junhao Xu, Shanshan Xu, Yingying Zhang, Yang Ji, Shuhuan Fei, Yushuai Zhao","doi":"10.1007/s43452-025-01219-1","DOIUrl":"10.1007/s43452-025-01219-1","url":null,"abstract":"<div><p>Air cushion fabric structures rely on the internal air pressure within the enclosed space to support external loads. However, during service, they are often subjected to puncture forces from hard objects, which can significantly undermine their structural integrity. To address this issue, the present study investigates the quasi-static puncture resistance behavior of air cushion fabric structures. The analysis focuses on the influence of several factors, including internal pressure, penetrator shape and material, yarn orientation, puncture location, and specimen geometry on puncture resistance. In addition, a computational model to evaluate the puncture resistance of cushion structures has been developed using the finite element (FE) method. The results indicate that puncture resistance is strongly dependent on the shape of the penetrator and the magnitude of the internal pressure. Flat penetrators induce the highest puncture resistance, followed by hemispherical and conical heads, with the latter exhibiting lower resistance due to edge-induced punching shear. Wooden penetrators produce smoother resistance curves but exhibit higher puncture resistance and displacement compared to steel penetrators. As internal pressure increases, a reduction in the cushion’s puncture resistance is observed. The FE models provided accurate predictions of the puncture resistance behavior of the cushions. </p></div>","PeriodicalId":55474,"journal":{"name":"Archives of Civil and Mechanical Engineering","volume":"25 4","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144108441","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Properties of green prepacked composites produced with slag cement: efficient recycling of micronized waste marble powder and waste wood sawdust 矿渣水泥绿色预包装复合材料的性能：高效回收微粉废大理石粉和废木屑

IF 4.4 3区工程技术

Archives of Civil and Mechanical Engineering Pub Date : 2025-05-21 DOI: 10.1007/s43452-025-01231-5

Barış Bayrak, Oğuzhan Yavuz Bayraktar, Halil Oğuzhan Kara, İhsan Türkel, İffet Gamze Mütevelli Özkan, Mehmet Uğur Yılmazoğlu, Emirhan Bektaşoğlu, Gökhan Kaplan, Abdulkadir Cüneyt Aydın

{"title":"Properties of green prepacked composites produced with slag cement: efficient recycling of micronized waste marble powder and waste wood sawdust","authors":"Barış Bayrak, Oğuzhan Yavuz Bayraktar, Halil Oğuzhan Kara, İhsan Türkel, İffet Gamze Mütevelli Özkan, Mehmet Uğur Yılmazoğlu, Emirhan Bektaşoğlu, Gökhan Kaplan, Abdulkadir Cüneyt Aydın","doi":"10.1007/s43452-025-01231-5","DOIUrl":"10.1007/s43452-025-01231-5","url":null,"abstract":"<div><p>This study aims to experimentally investigate the potential of recycling waste marble powder (WMP) and waste wood sawdust in green prepackaged composites. Using low-carbon emission slag cement, the study evaluated the mixtures prepared with different WMP ratios (25%, 50%, and 100%) and sawdust volumes (5%, 7.5%, and 10%). Fresh, physical, mechanical, and durability properties were tested; the effects of sodium silicate (Na<sub>2</sub>SO<sub>4</sub>) exposure, high temperature, and freeze–thaw cycles were investigated. The results show that WMP increases the flowability of the mixture and provides a homogeneous matrix structure when used with low sawdust ratios. It was determined that 50% WMP and 5% sawdust ratio provided optimum performance due to tight packing density and low void ratio. However, using 100% WMP and high-sawdust ratios negatively affected the durability performance by disrupting the matrix homogeneity. At high temperatures, the thermal resistance of WMP decreased, while sawdust’s porosity and microcrack formation increased. In freeze–thaw cycles, WMP and sawdust ratios caused significant mass loss and compressive strength changes. SEM analysis has shown that WMP and sawdust ratios determine microstructural homogeneity, porosity, and microcrack formation, and adversely affect binder phase thermal stability and mechanical strength, particularly at high temperatures. 25–50% WMP and 5% sawdust ratios provided the most balanced results between environmental sustainability and mechanical performance. These findings emphasize that WMP and sawdust ratios should be carefully optimized for sustainable construction material production. </p></div>","PeriodicalId":55474,"journal":{"name":"Archives of Civil and Mechanical Engineering","volume":"25 4","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s43452-025-01231-5.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144108442","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enhancing the tribological performance of polymeric laminated composite materials by adopting the functionally graded materials technique 采用功能梯度材料技术提高聚合物层合复合材料的摩擦学性能

IF 4.4 3区工程技术

Archives of Civil and Mechanical Engineering Pub Date : 2025-05-20 DOI: 10.1007/s43452-025-01224-4

Mostafa A. A. Nowier, Amr A. Abd-Elhady, Hossam El-Din M. Sallam, Mahmoud Atta

{"title":"Enhancing the tribological performance of polymeric laminated composite materials by adopting the functionally graded materials technique","authors":"Mostafa A. A. Nowier, Amr A. Abd-Elhady, Hossam El-Din M. Sallam, Mahmoud Atta","doi":"10.1007/s43452-025-01224-4","DOIUrl":"10.1007/s43452-025-01224-4","url":null,"abstract":"<div><p>The concept of functionally graded materials was adopted to experimentally enhance the wear resistance and hardness of the traditional laminated composite materials made of long glass fibers and epoxy resin in this work. The laminated composite structure consisted of twelve layers. The redistribution of fibers through the width of the specimens produces three distinct functionally graded patterns: linear, non-linear, and stepwise. A Shore-D hardness tester was used to get the hardness of each pattern, while their wear and friction coefficients were measured through a Pin-On-Disc tester according to ASTM standards for applied load varied from 10 to 40 N and sliding speed ranged from 0.2 to 0.8 m/s. The study also considered the effects of fiber orientation relative to the sliding direction, i.e., parallel, anti-parallel, and normal. The worn surfaces of the composite were inspected using an optical microscopy microscope, X-ray diffraction analysis, and scanning electron microscope. The results indicated that the wear rate, friction coefficient, and temperature of a functionally graded composite are influenced by several factors, including sliding speed, applied load, sliding distance, and fiber orientation. The composite demonstrated superior wear performance in the normal orientation compared to parallel and anti-parallel ones. The linear patterns improved the wear resistance rate and coefficient of friction of conventional composites with an average of 15% and 3%, respectively, in the normal orientation in all manners of applied forces and sliding velocities. Meanwhile, the stepwise patterns enhanced both of them by up to 25% and 8% in parallel and anti-parallel orientations for the same cases.</p></div>","PeriodicalId":55474,"journal":{"name":"Archives of Civil and Mechanical Engineering","volume":"25 4","pages":""},"PeriodicalIF":4.4,"publicationDate":"2025-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s43452-025-01224-4.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144090980","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0