Procedia Structural Integrity最新文献_第6页

Fatigue limit of advanced bainitic steels: notch effect 高级贝氏体钢的疲劳极限：缺口效应

Procedia Structural Integrity Pub Date : 2025-01-01 DOI: 10.1016/j.prostr.2025.06.087

Lucia Morales-Rivas , Eberhard Kerscher

引用次数: 0

Crashworthiness Simulations with LS-DYNA Investigating the Effect of Strain Rate-Dependent Material Models 基于LS-DYNA的耐撞性仿真研究应变率相关材料模型的影响

Procedia Structural Integrity Pub Date : 2025-01-01 DOI: 10.1016/j.prostr.2025.06.094

E. Ezgi Aytimur

{"title":"Crashworthiness Simulations with LS-DYNA Investigating the Effect of Strain Rate-Dependent Material Models","authors":"E. Ezgi Aytimur","doi":"10.1016/j.prostr.2025.06.094","DOIUrl":"10.1016/j.prostr.2025.06.094","url":null,"abstract":"<div><div>This study investigates the effect of using strain rate-dependent material models, specifically the Johnson-Cook, Cowper-Symonds and Elastic (non-strain rate effect) models, on crashworthiness simulations involving mild steel. The research examines the deformation, stress, deceleration and recovery coefficients of these models under single impact simulations conducted according to regulations of NHTSA. Ansys LS-DYNA version 13.1 was used for the simulation and material parameters were obtained from the study of Škrlec and Klemenc (2016) on mild steel E185. The results show various degrees of deformation where the Johnson-Cook model exhibits the lowest total deformation due to its ability to accurately capture strain rate sensitivity. Equivalent stress values show that the Johnson-Cook model has the highest stress, followed by the Cowper-Symonds and Elastic models. Deceleration values emphasize the superior prediction accuracy of the Johnson-Cook model, while restitution coefficients reveal differences in energy dissipation and recovery between the models. The findings emphasize the importance of selecting appropriate material models for collision simulations based on accuracy, computational efficiency and complexity tolerance. While the Johnson-Cook model offers improved prediction capabilities, it may require higher computational resources compared to simpler models such as the Elastic model. In conclusion, this study contributes to the understanding of material behaviour under dynamic loading conditions and provides insights for optimizing crash simulations to improve vehicle safety and structural integrity.</div></div>","PeriodicalId":20518,"journal":{"name":"Procedia Structural Integrity","volume":"68 ","pages":"Pages 540-546"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144580426","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Effect of Build Strategy on the Residual Stress Distribution in Additively Manufactured Duplex Stainless Steel Pressure Vessels 构建策略对增材制造双相不锈钢压力容器残余应力分布的影响

Procedia Structural Integrity Pub Date : 2025-01-01 DOI: 10.1016/j.prostr.2025.06.107

A.E. Odermatt , N. Al-Hamdany , G. Abreu Faria , S. Degener , N. Kashaev

引用次数: 0

The hybridization effect on the mechanical and piezoresistive behavior of epoxy nanocomposites 杂化对环氧纳米复合材料力学性能和压阻性能的影响

Procedia Structural Integrity Pub Date : 2025-01-01 DOI: 10.1016/j.prostr.2025.06.037

J.M. Parente , A.P. Silva , P.N.B. Reis

{"title":"The hybridization effect on the mechanical and piezoresistive behavior of epoxy nanocomposites","authors":"J.M. Parente , A.P. Silva , P.N.B. Reis","doi":"10.1016/j.prostr.2025.06.037","DOIUrl":"10.1016/j.prostr.2025.06.037","url":null,"abstract":"<div><div>Epoxy composites are used in a wide range of industrial applications due to their excellent mechanical properties. Furthermore, they can be functionalized by incorporating carbon-based nanomaterials, such as graphene with carbon nanotubes, to improve their mechanical performance and simultaneously provide an electrical response for very specific applications. Therefore, the main goal of this study is to analyze the mechanical and electrical properties of an epoxy resin reinforced with graphene nanoplatelets (GNP) and carbon nanotubes (CNTs) for industrial applications. For this purpose, several systems involving different amounts of nano-reinforcements were produced and evaluated to determine the architecture that simultaneously maximizes the bending strength and electrical conductivity. The results showed that the hybridization with 0.25 wt.% CNT and 0.5 wt.% GNP led to the most pronounced increases in mechanical and piezoresistivity properties suggesting that hybrid nano-reinforcements have enormous potential for obtaining multifunctional and high-performance materials for structural and/or sensors applications.</div></div>","PeriodicalId":20518,"journal":{"name":"Procedia Structural Integrity","volume":"68 ","pages":"Pages 160-165"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144580813","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Interface and phase-field dynamic quasi-brittle fracture of solids under tension or compression 固体在拉伸或压缩作用下的界面和相场动态准脆性断裂

Procedia Structural Integrity Pub Date : 2025-01-01 DOI: 10.1016/j.prostr.2025.06.044

Roman Vodička

引用次数: 0

Effect of pearlite on microstructures and tensile properties in Mn-heterogeneous steels 珠光体对锰非均质钢组织和拉伸性能的影响

Procedia Structural Integrity Pub Date : 2025-01-01 DOI: 10.1016/j.prostr.2025.07.014

Dezhen Yang , Youjing Zhang , Hao Zhang , Qi Chen , Xiaohui Wang , Zhiping Xiong

{"title":"Effect of pearlite on microstructures and tensile properties in Mn-heterogeneous steels","authors":"Dezhen Yang , Youjing Zhang , Hao Zhang , Qi Chen , Xiaohui Wang , Zhiping Xiong","doi":"10.1016/j.prostr.2025.07.014","DOIUrl":"10.1016/j.prostr.2025.07.014","url":null,"abstract":"<div><div>Mn heterogeneity in high-temperature austenite is an effective way to tailor retained austenite and achieve a good balance of strength and ductility. Instead of conventional quenching and tempering, fast and short austenitization from Mn-partitioned pearlite followed by quenching and tempering is carried out, leading to the formation of ghost pearlite. Here, we have studied the role of the lamellar width of cementite on microstructures and tensile properties in Mn-heterogeneous steels. With increasing pearlite transformation temperature from 540 °C to 570 °C, the lamellar width of cementite increases from 11.4±2.1 nm to 18.3±2.8 nm, effectively enlarging the size of the Mn-enriched regions in high-temperature austenite, thereby facilitating the formation of ghost pearlite after quenching to room temperature. The high volume fraction of ghost pearlite can ensure a high strength due to refined width of martensitic lath, while high RA fraction can ensure a good ductility, leading to a simultaneous increase in yield strength and uniform elongation with increasing pearlite transformation temperature.</div></div>","PeriodicalId":20518,"journal":{"name":"Procedia Structural Integrity","volume":"69 ","pages":"Pages 97-104"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144587741","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","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 beam shaping in laser welding on the microstructure and transformation temperatures of NiTiHf high-temperature shape memory alloy 激光焊接中光束整形对NiTiHf高温形状记忆合金显微组织和相变温度的影响

Procedia Structural Integrity Pub Date : 2025-01-01 DOI: 10.1016/j.prostr.2025.07.007

C.A. Biffi , A.G. Demir , L. Caprio , J. Fiocchi , B. Previtali , A. Tuissi

引用次数: 0

Enhancing the functional fatigue properties of TiNbZrSn biocompatible Shape memory alloy through femtosecond laser shock peening 飞秒激光冲击强化TiNbZrSn生物相容性形状记忆合金的功能疲劳性能

Procedia Structural Integrity Pub Date : 2025-01-01 DOI: 10.1016/j.prostr.2025.07.006

Muhammad Asim , Wael Abuzaid , Faisal Mustafa , Ali S. Alnaser

引用次数: 0

Optimizing concrete performance: Influence of carbon nanotubes dispersion techniques 优化混凝土性能：碳纳米管分散技术的影响

Procedia Structural Integrity Pub Date : 2025-01-01 DOI: 10.1016/j.prostr.2025.06.006

E.D. Reis , F. Gatuingt , F.S.J. Poggiali , A.C.S. Bezerra

{"title":"Optimizing concrete performance: Influence of carbon nanotubes dispersion techniques","authors":"E.D. Reis , F. Gatuingt , F.S.J. Poggiali , A.C.S. Bezerra","doi":"10.1016/j.prostr.2025.06.006","DOIUrl":"10.1016/j.prostr.2025.06.006","url":null,"abstract":"<div><div>Given the challenges of decarbonizing materials commonly used in the construction industry and the promising use of nanoparticles in cement composites, this article aims to analyze the influence of carbon nanotubes (CNTs) dispersion techniques on concrete quality. To this end, multi-walled carbon nanotubes were pre-dispersed in Portland cement particles in isopropanol after mechanical stirring, sonication, and oven drying. Then, 0% (reference), 0.05%, and 0.10% CNTs were used to make thirty-six cylindrical specimens measuring 10 × 20 cm (diameter × height). The properties of compressive strength (f<sub>c</sub>), tensile strength (f<sub>ct</sub>), porosity (P), and ultrasonic pulse velocity (UPV) were measured. Scanning electron microscopy (SEM) was also carried out on the broken samples to capture any effect of the CNTs. The results were compared with those of similar studies in the literature, but which used other dispersion techniques and CNT contents. Compared to the reference samples, the concrete with CNTs showed significant improvements in f<sub>c</sub> (up to 23% increase), f<sub>ct</sub> (up to 35% increase), P (up to 12% reduction), and UPV (up to 4% increase). However, considering the low CNT contents used, the action of CNTs in the concrete was not detected using SEM images. The analysis and discussion of the results proved the effectiveness of pre-dispersion of CNTs in cement particles, but choosing CNTs in aqueous suspension with industrial dispersion tends to be a more practical and safer approach for improving the concrete quality and extend the useful life of structures built with this composite.</div></div>","PeriodicalId":20518,"journal":{"name":"Procedia Structural Integrity","volume":"67 ","pages":"Pages 39-46"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144572452","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Nanomaterials advancements: probing environmental sustainability of alumina nanofiber dispersion for Ultra High Performance Concrete 纳米材料的进展：探索氧化铝纳米纤维分散体在超高性能混凝土中的环境可持续性

Procedia Structural Integrity Pub Date : 2025-01-01 DOI: 10.1016/j.prostr.2025.06.008

Davide di Summa , Estefania Cuenca , Nele De Belie , Liberato Ferrara

{"title":"Nanomaterials advancements: probing environmental sustainability of alumina nanofiber dispersion for Ultra High Performance Concrete","authors":"Davide di Summa , Estefania Cuenca , Nele De Belie , Liberato Ferrara","doi":"10.1016/j.prostr.2025.06.008","DOIUrl":"10.1016/j.prostr.2025.06.008","url":null,"abstract":"<div><div>Alumina nano-fibres, incorporated into Ultra High Performance Concrete (UHPC), play a dual role by enhancing mechanical performance and improving durability under aggressive conditions, particularly through stimulated autogenous crack sealing and performance self-healing mechanisms. The superior performance of UHPC, enriched with alumina nano-fibres, is attributed to their nano-scale reinforcing effects, exerting control over the cracking process from its initiation, and their hydrophilic nature, promoting cement and binder hydration reactions. Goal of this study is to address the environmental sustainability of alumina nano-fibres through a Life Cycle Assessment (LCA) analysis. Concentrated versions of alumina nanofibers are specifically examined, employing chemical admixtures such as polycarboxylate sodium salt (PCE) for dispersion. This strategic approach intensifies intermixing and prevents gelatinization arising from the inherent hydrophilic nature of alumina nano-fibres. Through LCA analysis, the study sheds light on the environmental footprint associated with the production and application of alumina nano-fibres in UHPC, through a broad perspective contributing valuable insights into the sustainability of these materials and enabling informed decision-making for their future applications in the construction industry.</div></div>","PeriodicalId":20518,"journal":{"name":"Procedia Structural Integrity","volume":"67 ","pages":"Pages 53-60"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144572454","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0