Engineering Fracture Mechanics最新文献_第7页

Comparison of dynamic fracture toughness and critical J-integral criteria under high loading rates

IF 4.7 2区工程技术

Engineering Fracture Mechanics Pub Date : 2025-03-10 DOI: 10.1016/j.engfracmech.2025.111035

Changzeng Fan , Zejian Xu , Yang Han , Gang Wu , Rui He , Hao Cui , Zhicheng Cai , Yan Liu , Fenglei Huang

{"title":"Comparison of dynamic fracture toughness and critical J-integral criteria under high loading rates","authors":"Changzeng Fan , Zejian Xu , Yang Han , Gang Wu , Rui He , Hao Cui , Zhicheng Cai , Yan Liu , Fenglei Huang","doi":"10.1016/j.engfracmech.2025.111035","DOIUrl":"10.1016/j.engfracmech.2025.111035","url":null,"abstract":"<div><div>Dynamic fracture toughness (DFT) and the critical <em>J-</em>integral are two key criteria traditionally used to assess the onset of crack initiation in materials. These criteria, however, are not interchangeable within the elastic–plastic range. Consequently, understanding their validity becomes crucial, particularly when the material’s failure mode changes. In this study, we employed the electromagnetic Hopkinson bar technique and Digital Image Correlation (DIC) to conduct compact tensile tests on two ultra-high-strength steels (UHSS) under high loading rates. DFT was determined through an experimental–numerical method, while the critical <em>J-</em>integral was obtained indirectly using the DIC technique. The crack initiation mode was identified by analyzing the fracture morphology at the crack tip. The findings reveal that as the crack initiation mode shifts, the DFT criterion becomes less reliable in characterizing a material’s resistance to crack initiation. In contrast, the critical <em>J-</em>integral remains a robust and applicable measure.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"319 ","pages":"Article 111035"},"PeriodicalIF":4.7,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143619568","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Assessing hydrogen embrittlement of alloy 718: Hollow and conventional tensile tests

IF 4.7 2区工程技术

Engineering Fracture Mechanics Pub Date : 2025-03-10 DOI: 10.1016/j.engfracmech.2025.111028

Fabien Ebling , Philipp Bratsch , Stefan Wagner , Astrid Pundt , Johannes Preußner , Heiner Oesterlin , Ken Wackermann , Thorsten Michler

{"title":"Assessing hydrogen embrittlement of alloy 718: Hollow and conventional tensile tests","authors":"Fabien Ebling , Philipp Bratsch , Stefan Wagner , Astrid Pundt , Johannes Preußner , Heiner Oesterlin , Ken Wackermann , Thorsten Michler","doi":"10.1016/j.engfracmech.2025.111028","DOIUrl":"10.1016/j.engfracmech.2025.111028","url":null,"abstract":"<div><div>Testing of metals for hydrogen embrittlement is of great interest for a safe hydrogen infrastructure. However, the costs and efforts involved in in-situ tests in hydrogen pressure autoclaves are high. Simpler alternatives are ex-situ testing with hydrogen pre-charging or in-situ testing with the hollow specimen technique, in which the specimen is pressurized with hydrogen gas from the inside through a longitudinal hole. However, the comparability of the techniques has not been conclusively clarified.</div><div>Slow strain rate tensile tests are carried out with the three techniques on the nickel-based alloy 718 in wrought and additive manufactured states. Experiments are performed at hydrogen gas pressures up to 200 bar. Testing in nitrogen gas is used as a reference. Hydrogen pre-charging was conducted at 350 °C and 100 bar pressure. The in-situ techniques show increasing hydrogen embrittlement with increasing hydrogen pressure. The most severe embrittlement could be achieved with hydrogen pre-charging. Conventional and hollow specimens agree on yield strength and tensile strength but differ in elongation to failure and reduction of area. Influencing variables such as surface qualities and multi-axial stresses in hollow specimens resulting from the internal pressure are discussed. The damage mechanisms of all techniques are analyzed by fracture surface examinations using SEM and EBSD.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"319 ","pages":"Article 111028"},"PeriodicalIF":4.7,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143610134","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Mode-Ⅰ fracture of laminated flattened-bamboo lumbers: An experimental study based on the double cantilever beam method and DIC technology

IF 4.7 2区工程技术

Engineering Fracture Mechanics Pub Date : 2025-03-09 DOI: 10.1016/j.engfracmech.2025.111025

Yue Chen , Haitao Li , Dong Yang , Xin Xue , Conggan Yuan , Ottavia Corbi

{"title":"Mode-Ⅰ fracture of laminated flattened-bamboo lumbers: An experimental study based on the double cantilever beam method and DIC technology","authors":"Yue Chen , Haitao Li , Dong Yang , Xin Xue , Conggan Yuan , Ottavia Corbi","doi":"10.1016/j.engfracmech.2025.111025","DOIUrl":"10.1016/j.engfracmech.2025.111025","url":null,"abstract":"<div><div>The longitudinal Mode-I fracture characteristics of laminated flattened-bamboo lumber (LFBL) were tested using the Double Cantilever Beam (DCB) method in combination with Digital Image Correlation (DIC) technology, and the effects of initial crack length (<em>a</em><sub>0</sub>), specimen height (<em>H</em>), and specimen thickness (<em>B</em>) were analyzed. The results showed that crack propagation was primarily attributed to the failure of the weaker ground tissue, accompanied by fiber bridging phenomena. As <em>B</em> increased, the failure mode of the specimen gradually shifted from ductile to brittle failure. The <em>a</em><sub>0</sub> had no effect on the critical strain energy release rate (<em>G</em><sub>Ic</sub>). When <em>B</em> and <em>H</em> satisfied the conditions of <em>B</em>/<em>H</em> ≥ 0.6 and <em>H</em> ≥ 40 mm, <em>G</em><sub>Ic</sub> stabilized to a constant, suggesting it is an inherent property of the material. Among various theoretical methods, the results calculated using the Compliance Calibration (CC) method and the Modified Compliance Calibration (MCC) method were close to those obtained by the Direct Measurement (DM) method proposed in this study. The values of the longitudinal Mode-I fracture toughness of LFBL obtained in this study is: critical strain energy release rate <em>G</em><sub>Ic</sub> = 0.77 N/mm.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"319 ","pages":"Article 111025"},"PeriodicalIF":4.7,"publicationDate":"2025-03-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143619569","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

New method for crack length determination in low-temperature DCB tests based on electrical capacitance 基于电容的低温直流电压试验裂纹长度测定新方法

IF 4.7 2区工程技术

Engineering Fracture Mechanics Pub Date : 2025-03-09 DOI: 10.1016/j.engfracmech.2025.111012

Tobias Tiedemann, Florian Chen, Bodo Fiedler

引用次数: 0

Experimental investigation of the effect of interface angle on mode-I fracture toughness in DCB laminates using digital image correlation

IF 4.7 2区工程技术

Engineering Fracture Mechanics Pub Date : 2025-03-08 DOI: 10.1016/j.engfracmech.2025.110988

Linlin Deng , Liu Liu , John-Alan Pascoe , René Alderliesten

引用次数: 0

An improved analytical formula of generalised stress intensity factors for blunt V-notches in orthotropic plates 正交各向异性板中钝 V 形缺口的广义应力强度因子的改进分析公式

IF 4.7 2区工程技术

Engineering Fracture Mechanics Pub Date : 2025-03-08 DOI: 10.1016/j.engfracmech.2025.110981

Zishuo Wang , Lifei Song , Jiajing Lei , Weiqin Liu , Wei Shen , Kang Liu

{"title":"An improved analytical formula of generalised stress intensity factors for blunt V-notches in orthotropic plates","authors":"Zishuo Wang , Lifei Song , Jiajing Lei , Weiqin Liu , Wei Shen , Kang Liu","doi":"10.1016/j.engfracmech.2025.110981","DOIUrl":"10.1016/j.engfracmech.2025.110981","url":null,"abstract":"<div><div>For anisotropic plates with notches, the notch stress field is not only related to the opening depth, notch angle and geometric size, but also closely related to the elastic properties of materials. In order to simplify the assessment method of notch stress and GSIF for single edge blunt V-notches orthotropic thin plate, a semi-analytical formula of notch stress field of anisotropic plate is proposed based on the characteristic equation of generalized biharmonic equation of anisotropic body. By equating geometric dimensions, opening angle and elastic properties of materials with equivalent strength factors of orthotropic materials, the notch stress field and GSIF of planar composite plates are simplified and solved. After a large number of finite element numerical cases and multi-parameter analysis, the empirical formula of dimensionless GSIF is obtained by fitting. The prediction results of the improved formula are compared with the GSIF and stress fields of numerical models under different materials and geometric conditions. The results show that the error between the predicted GSIF results and the numerical results by the semi-analytical formula proposed in this paper is less than 5%, which is more accurate than the traditional analytical formula. The related formulas and conclusions provide a basis for the design optimization and safety evaluation of composite blunt V-notches structures.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"319 ","pages":"Article 110981"},"PeriodicalIF":4.7,"publicationDate":"2025-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143600368","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

A correlation between unified constraint parameter and J-R curves of different metallic materials

IF 4.7 2区工程技术

Engineering Fracture Mechanics Pub Date : 2025-03-08 DOI: 10.1016/j.engfracmech.2025.110999

J.Y. Xiao, J. Yang

{"title":"A correlation between unified constraint parameter and J-R curves of different metallic materials","authors":"J.Y. Xiao, J. Yang","doi":"10.1016/j.engfracmech.2025.110999","DOIUrl":"10.1016/j.engfracmech.2025.110999","url":null,"abstract":"<div><div>To enhance the safety of service and the economic efficiency of operation and maintenance of cracked structures in structural integrity assessment, it is essential to investigate and establish the general correlation of constraint-dependent <em>J-R</em> curves for different metallic materials. This research makes use of a large number of <em>J-R</em> curves data of different metallic materials. These data are predominantly measured or simulated from SEN(B) specimens with different geometries and sizes (representing various constraint levels). Additionally, the research utilizes the load-independent unified constraint parameter <em>A<sub>d</sub></em>* data calculated for each specimen through the finite element method. Based on these data, a general correlation equation of constraint-dependent <em>J-R</em> curves for different metallic materials has been established. This general correlation equation can predict constraint-dependent <em>J-R</em> curves for components or structures with varying levels of constraint and different metallic materials, and its predictive capability and accuracy have been validated using experimental and simulated <em>J-R</em> curves data of different homogeneous materials and welded joint materials. This general correlation equation can provide a simple and convenient approach to predicting and estimating constraint-dependent <em>J-R</em> curves, significantly lowering both experimental and computational costs, and has a broad application range for metallic materials, loading modes, geometries and crack sizes.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"319 ","pages":"Article 110999"},"PeriodicalIF":4.7,"publicationDate":"2025-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143600473","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 evaluation method for grain refinement effect of UIT on fatigue life of welded joints based on crystal plasticity

IF 4.7 2区工程技术

Engineering Fracture Mechanics Pub Date : 2025-03-07 DOI: 10.1016/j.engfracmech.2025.111023

Shao-hui Han , Chuang Cui , Qinghua Zhang , Ying Wang , Yi Xie , Yun-hui Zhang

{"title":"The evaluation method for grain refinement effect of UIT on fatigue life of welded joints based on crystal plasticity","authors":"Shao-hui Han , Chuang Cui , Qinghua Zhang , Ying Wang , Yi Xie , Yun-hui Zhang","doi":"10.1016/j.engfracmech.2025.111023","DOIUrl":"10.1016/j.engfracmech.2025.111023","url":null,"abstract":"<div><div>Ultrasonic impact treatment (UIT) is regarded as one of the most promising post-weld techniques for improving the fatigue performance of welded joints because of its complex enhancement effects. However, difficulties in evaluating the multiple enhancement effects of UIT, especially the effect of grain refinement, on the fatigue life of welded joints have significantly hindered the application of this technique. Thus, a fatigue life evaluation method based on crystal micro-plastic slip (<em>p</em>) was proposed in this study, and the united <em>p</em>-<em>N</em> curve for both as-welded joints and welded joints subjected to UIT with different impact parameters was determined by re-analyzing relevant experimental data in the literature. The proposed <em>p</em>-<em>N</em> curve was then used to evaluate the fatigue performance of nine rib-to-deck joints in orthotropic steel bridge decks, which further verified the applicability of the united <em>p</em>-<em>N</em> curve for fatigue performance evaluation of as-welded and UIT joints under complex loading conditions. Finally, the grain refinement effect of UIT on the fatigue performance of welded joints was discussed and analyzed. The results showed that the fatigue life of the as-welded joints was extended by 10.4 % ∼ 17.1 % owing to the grain refinement effect of UIT.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"319 ","pages":"Article 111023"},"PeriodicalIF":4.7,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143578372","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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 role of shear interlock effect of CA on the pre-peak cracking of UHPC-CA

IF 4.7 2区工程技术

Engineering Fracture Mechanics Pub Date : 2025-03-07 DOI: 10.1016/j.engfracmech.2025.111024

Tengfeng Geng, Baozhen Luo, Yu Zhang, Ziying Chen, Shaohua Li

{"title":"The role of shear interlock effect of CA on the pre-peak cracking of UHPC-CA","authors":"Tengfeng Geng, Baozhen Luo, Yu Zhang, Ziying Chen, Shaohua Li","doi":"10.1016/j.engfracmech.2025.111024","DOIUrl":"10.1016/j.engfracmech.2025.111024","url":null,"abstract":"<div><div>Coarse aggregate (CA) can mitigate the shrinkage of Ultra-High Performance Concrete (UHPC), however, the pre-peak cracking process of UHPC containing CA (UHPC-CA) under mixed tensile-shear loading remains unclear. Herein, microcracking, mesoscale fracture and macroscale cracking resistance are quantified with the aim to clarify the role of CA on the pre-peak cracking mechanism of UHPC-CA. The results show that, as shear stress proportion increases, a localized strain concentration appears along CA, exhibiting a shear interlock effect of CA. Based on the integrated machine learning based acoustic emission mode classification, more shear microcracking events are detected. Moreover, higher shear proportion results in a higher fracture across CA at the mesoscale and a mineral crystal fracture mode transformation, from intergranular fracture to transgranular fracture, at the microscale. As a result, CA leads to a delayed initiation of full-developed fracture process zone and larger fracture energy, consequently, higher cracking resistance of UHPC-CA under mixed tensile-shear loading.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"319 ","pages":"Article 111024"},"PeriodicalIF":4.7,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143610133","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Study on tensile property of thin spray-on liner based on fractal characteristics of pore structure

IF 4.7 2区工程技术

Engineering Fracture Mechanics Pub Date : 2025-03-06 DOI: 10.1016/j.engfracmech.2025.110946

Qingfa Chen, Jian Ma, Jiayou Wu, Chenyang Liu

{"title":"Study on tensile property of thin spray-on liner based on fractal characteristics of pore structure","authors":"Qingfa Chen, Jian Ma, Jiayou Wu, Chenyang Liu","doi":"10.1016/j.engfracmech.2025.110946","DOIUrl":"10.1016/j.engfracmech.2025.110946","url":null,"abstract":"<div><div>The thin spray-on liner (TSL) presents as a composite of considerable promise for application in mining and tunnel engineering domains. It serves not only to support the rock mass but also to inhibit the oxidation of both rock bolts and wire mesh. The tensile property of TSL plays a crucial role in governing the design and performance of support systems. And the macroscopic tensile properties of TSL mainly depends on the micro-pore structures. Thus, this study utilized porosity as an intermediary to develop a predictive model for the effective tensile strength of TSL based on fractal characteristics of pore structure. First, dual fractal dimensions were utilized to construct the a relation model of the fractal dimensions of pore structures and porosity. Subsequently, the quantitative relationship between the effective tensile strength and porosity was constructed by applying the TSL equivalent central pore model. Following this, by incorporating porosity as an intermediary, a predictive model was constructed for the tensile strength of TSL based on the dual fractal dimensions. The established models were finally employed to predict both porosity and effective tensile strength. The results demonstrate a good fit between the measured values and the predicted values, indicating the model’s reliability.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"319 ","pages":"Article 110946"},"PeriodicalIF":4.7,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143642883","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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