Engineering Fracture Mechanics最新文献

{"title":"Effect of shrinkage-induced initial damage on the frost resistance of concrete in cold regions","authors":"Yanchun Miao ,&nbsp;Wanhao Yu ,&nbsp;Lin Jin ,&nbsp;Liguo Wang ,&nbsp;Junlin Lin ,&nbsp;Yali Li ,&nbsp;Zeyu Lu ,&nbsp;Jinyang Jiang","doi":"10.1016/j.engfracmech.2024.110652","DOIUrl":"10.1016/j.engfracmech.2024.110652","url":null,"abstract":"<div><div>The shrinkage-induced initial damage poses a threat to the frost resistance of concrete in cold regions with low relative humidity (RH). However, the progression of freeze–thaw damage in concrete affected by this initial damage, along with the quantitative relationships among RH, freeze–thaw damage, and the number of freeze–thaw cycles (FTCs), remains unexplored. This study employed combination of experimental and numerical simulation approaches to address these challenges. Experimentally, the freeze–thaw damage of concrete cured at low RH (40 ± 5 %) was compared with that cured at standard RH (95 ± 5 %) after varying FTCs. Results indicated that the former experienced more severe freeze–thaw damage, characterized by increased surface peeling, higher mass loss rate, and greater compressive strength attenuation. For the simulation aspect, a numerical model incorporating cohesive elements was firstly proposed to study the evolution of freeze–thaw damage in concrete cured at different RH under FTCs, of which the rationality was confirmed through experimental data. Additionally, the effect of FTCs and curing RH on freeze–thaw damage was investigated, revealing a negative correlation between freeze–thaw damage and curing RH, resulting in opposite evolution trend for residual mechanical properties of concrete. Finally, the freeze–thaw damage prediction model was proposed based on simulation results, and the error between the predicted and actual values was only 2.1 %, which confirmed that this model can be adopted to accurately assess the freeze–thaw damage degree of concrete cured by different RH after different FTCs. In conclusion, this study aims to better understand the freeze–thaw damage evolution of concrete cured under low RH, which provides a feasible scheme for the frost resistant design of concrete construction in cold regions.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"312 ","pages":"Article 110652"},"PeriodicalIF":4.7,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142657967","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}

{"title":"A novel method for failure probability prediction of plain weave composites considering loading randomness and dispersion of strength","authors":"Bingyao Li ,&nbsp;Youming Li ,&nbsp;Jingran Ge ,&nbsp;Jianguo Wu ,&nbsp;Zengwen Wu ,&nbsp;Jun Liang","doi":"10.1016/j.engfracmech.2024.110649","DOIUrl":"10.1016/j.engfracmech.2024.110649","url":null,"abstract":"<div><div>A new method based on combined residual stiffness-strength degradation is developed to predict the failure probability of plain weave composites subjected to random fatigue loadings. All the parameters presented in the proposed analytical model are characterized using the outcomes from quasi-static and constant amplitude fatigue testing. The evolution of residual strength is obtained based on combined residual stiffness-strength degradation model, which can greatly reduce the cost of the experiments. The Weibull distribution with two parameters is used to account for the dispersion of residual strength. Combing with randomness statistics of the fatigue loadings and the interference criterion of stress-strength, the fatigue failure behavior and failure probability are obtained. The narrow-band random vibration experiments were conducted to generate the random loadings and validate the predicted results. The approach proposed in this paper takes full advantage of residual stiffness or residual strength method and has better accuracy.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"312 ","pages":"Article 110649"},"PeriodicalIF":4.7,"publicationDate":"2024-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142657963","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}

{"title":"Multiaxial failure of dual-phase elastomeric composites","authors":"Mohit Goswami ,&nbsp;Piyush Gupta ,&nbsp;Yoav Lev ,&nbsp;Santanu Chattopadhyay ,&nbsp;Konstantin Volokh","doi":"10.1016/j.engfracmech.2024.110625","DOIUrl":"10.1016/j.engfracmech.2024.110625","url":null,"abstract":"<div><div>The natural rubber (NR) and styrene butadiene rubber (SBR) based composites are used in several industrial applications, mainly tires. The mechanical properties can be tailored by blending them in appropriate ratios. In the present study, blended polymer–matrix composites are tested for uniaxial and bulge tests. Simultaneous constitutive modeling with failure description is done for uniaxial and equibiaxial test results. Using the computational modeling we study the problem of cavitation and compare these results with morphological analysis. The finite element analysis (FEA) is used to analyze state of stress throughout the bulge. We find that the rubber composites can behave contradictorily under different types of mechanical testing environments. For instance, the pressure at failure for SBR composite is found to be 3% more than NR composite under bulge test. However, tensile strength of NR composite is found to 40% more than that of SBR composite, when tested uniaxially. The critical hydrostatic tension corresponding to onset of cavitation is observed to decreasing by more than 20% when NR composite is compared with SBR composite. The dual phase rubber composite with 25% NR and 75% SBR exhibits better mechanical properties, when compared with other blended composites.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"312 ","pages":"Article 110625"},"PeriodicalIF":4.7,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142657917","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}

{"title":"Predicting fracture strength of polarized GaN semiconductive ceramics under combined mechanical-current loading","authors":"GuoShuai Qin ,&nbsp;ShiJie Wang ,&nbsp;ZhenYu Wang ,&nbsp;MingKai Guo ,&nbsp;CuiYing Fan ,&nbsp;MingHao Zhao ,&nbsp;Chunsheng Lu","doi":"10.1016/j.engfracmech.2024.110655","DOIUrl":"10.1016/j.engfracmech.2024.110655","url":null,"abstract":"<div><div>Gallium nitride (GaN) piezoelectric semiconductor ceramics (PSCs) structures are often subjected to combined mechanical and electrical fields in engineering applications, leading to complex deformation and fracture challenges. This paper presents a fracture predictive model for PSCs under combined mechanical and electrical loading, developed using the boundary effect model rather than relying solely on data fitting. By introducing a current parameter that influences the characteristic crack length, the model effectively predicts the quasi-brittle fracture characteristics of GaN PSCs. Additionally, the model reveals how electric current affects the quasi-brittle fracture behavior of PSCs, providing crucial theoretical support for the reliable design of GaN intelligent semiconductor structures in complex environments.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"312 ","pages":"Article 110655"},"PeriodicalIF":4.7,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142657816","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}

{"title":"Experimental and numerical investigation on the failure behaviors of laminates with various shaped cutouts under tensile loading","authors":"Zhengliang Liu ,&nbsp;Leilei Yan ,&nbsp;Zhen Wu ,&nbsp;Jie Zhou","doi":"10.1016/j.engfracmech.2024.110646","DOIUrl":"10.1016/j.engfracmech.2024.110646","url":null,"abstract":"<div><div>Composite structures in aircraft often contain many cutouts, and failure of these structures is prone to occur near the edge of cutouts. Therefore, the failure behaviors of laminates with various shaped cutouts should be carefully investigated. To this end, experiments and numerical simulations are employed to investigate this issue. The tensile tests of composite laminates with circular, elliptical, square, and rectangular cutouts were carried out. Digital image correlation was utilized to capture the strain fields around the cutout. Combining the strain failure criterion and the modified exponential damage variables, a three-dimensional progressive damage model was established, which can accurately predict the peak loads of composite laminates with diverse cutouts. All errors between the experimental and numerical results are less than 10 %. The experimental and numerical results indicate that the shape of the cutout has a great influence on the peak loads. As the ratio of major axis to minor axis (<em>a</em>/<em>b</em>) is increased from 1 to 5, peak loads obviously increase for the laminates with elliptical cutouts. Experimental results show that the average peak load of the laminates with elliptical cutout (<em>a</em>/<em>b</em> = 4) is 20.0 % higher than that of the laminates with circular cutout (<em>a</em>/<em>b</em> = 1). The dispersed distribution of high strains near the edge of the cutout results in an improvement of bearing capacity. As the ratio of length to width (<em>l</em>/<em>w</em>) in rectangular cutouts is increased from 0.5 to 3, peak loads are also improved obviously, because experimental results show that the average peak load of the laminates with rectangular cutout (<em>l</em>/<em>w</em> = 0.5) is 12.3 % lower than that of the laminates with square cutout (<em>l</em>/<em>w</em> = 1). Therefore, to improve the peak loads, it is very necessary to select the proper ratios of <em>a</em>/<em>b</em> and <em>l</em>/<em>w.</em> The above conclusions can serve as a reference for the design of composite structures.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"312 ","pages":"Article 110646"},"PeriodicalIF":4.7,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142657814","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}

{"title":"Comprehensive analysis of mode-I cracking in ice: Exploring full-range rate dependency","authors":"Fuxin Rui ,&nbsp;Jiaqing Dong ,&nbsp;Xindong Wei ,&nbsp;Yan Huang ,&nbsp;Gao-Feng Zhao","doi":"10.1016/j.engfracmech.2024.110650","DOIUrl":"10.1016/j.engfracmech.2024.110650","url":null,"abstract":"<div><div>Ice, as a crystalline material, demonstrates a unique response in its mode-I fracture toughness to variations in loading rates, characterized by an initial decrease and subsequent increase in toughness. This phenomenon has been explored in limited studies. In this work, an extensive numerical analysis of mode-I ice cracking is conducted by using the distinct lattice spring model (DLSM). Norton-Bailey Drucker-Prager DLSM (NB-DP-DLSM) is initially employed to investigate the classical explanations of creep and stress relaxation for the anomaly observed in ice’s fracture toughness at lower loading rates, but this approach does not successfully replicate the experimentally observed strain rate dependency. Then, two rate-dependent constitutive models are introduced to further examine the mode-I fracture mechanics of ice. Our numerical simulations of three-point bending tests show that the relationship between fracture toughness and strain rate at lower levels is more accurately captured by rate-dependent models. For higher strain rates, our numerical modeling of notched semi-circular bending tests indicates that a rate-independent constitutive model can replicate the loading rate dependency of ice’s mode-I fracture toughness. In conclusion, these observations suggest that a reverse-stage-like dynamic constitutive model for DLSM can potentially capture the full range of loading rate dependencies observed in ice.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"312 ","pages":"Article 110650"},"PeriodicalIF":4.7,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142657968","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}

{"title":"An enhanced Hosford–Coulomb fracture model for predicting ductile fracture under a wide range of stress states","authors":"Yuze Song ,&nbsp;Yuhao Guo ,&nbsp;Gang Liu ,&nbsp;Jinbo Han ,&nbsp;Shichao Wang ,&nbsp;Weiping He ,&nbsp;Shiyang Zhu","doi":"10.1016/j.engfracmech.2024.110635","DOIUrl":"10.1016/j.engfracmech.2024.110635","url":null,"abstract":"<div><div>In this study, an Enhanced Hosford–Coulomb (EHC) fracture model is proposed, which suits a wide range of stress states. The model is validated by quantitatively investigating the ductile fracture behaviors of Ti-6Al-3Nb-2Zr-1Mo titanium alloy through experiments and numerical simulations, and the fracture morphologies are characterized using scanning electron microscopy. The results show that the EHC model has higher accuracy in predicting ductile fracture strain for Ti-6Al-3Nb-2Zr-1Mo alloy compared to the original Hosford–Coulomb (HC) model. Finally, the accuracy and material applicability of the EHC model are further verified with X80 pipeline steel and AA2024-T351 aluminum alloy, demonstrating its advantages.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"312 ","pages":"Article 110635"},"PeriodicalIF":4.7,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142657962","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}

{"title":"Effective stress intensity factor range for fatigue cracks propagating in mixed mode I-II loading","authors":"Shuancheng Wang ,&nbsp;Shuwei Zhou ,&nbsp;Bing Yang ,&nbsp;Shoune Xiao ,&nbsp;Guangwu Yang ,&nbsp;Tao Zhu","doi":"10.1016/j.engfracmech.2024.110641","DOIUrl":"10.1016/j.engfracmech.2024.110641","url":null,"abstract":"<div><div>The actual service axles are often subjected to mixed-mode loading, and predicting the mixed-mode I-II crack propagation behaviour using the mode I effective stress intensity factor (Δ<em>K</em>_I) differs from the real service conditions. To effectively predict the fatigue crack propagation behaviour of actual service structures, the I-II stress intensity factor range (Δ<em>K</em>_P-R) considering two closure effects was adopted to describe the fatigue crack propagation under mixed mode loading. A test database was established based on monitoring data of mode I and mixed-mode I-II (30/45/60°) crack propagation tests under different stress ratios. Combining domain knowledge and symbolic regression (SR) methods, an angle factor was proposed for constructing correlation functions between Δ<em>K</em>_I and Δ<em>K</em>_P-R. The results showed that the loading angle (<em>α</em>) only affects the initial projection of the load parallel and perpendicular to the fatigue crack growth (FCG) direction. Compared with the geometric correction factor, the correlation function acquired by the angle factor constructed by the SR method has higher accuracy, and the balance parameters (SCORE) obtained by the former are significantly higher than those obtained by the latter under the same function complexity. The SR verification results demonstrated that constructing mode I and I-II correlation functions with angle factors has a good predictive effect.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"312 ","pages":"Article 110641"},"PeriodicalIF":4.7,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142657965","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}

{"title":"Coupling effects of loading rate and temperature on mode I dynamic fracture characteristics of ductile cast iron","authors":"Changzeng Fan ,&nbsp;Kaili Qi ,&nbsp;Zhou Zhou ,&nbsp;Zejian Xu ,&nbsp;Mengyu Su ,&nbsp;Zhicheng Cai ,&nbsp;Yan Liu ,&nbsp;Fenglei Huang","doi":"10.1016/j.engfracmech.2024.110651","DOIUrl":"10.1016/j.engfracmech.2024.110651","url":null,"abstract":"<div><div>Engineering structures made of ductile cast iron (DCI) have a potential risk of failure due to extreme service environments such as high velocity impacts and sub-zero temperatures. Therefore, it is of great importance to investigate the dynamic fracture behavior of DCI under the coupling effect of rate and temperature. In this paper, two sets of impact velocities (5 m/s and 13.5 m/s), and four sets of temperatures (20 °C, −40 °C, −60 °C, and −80 °C) were specially designed to investigate the coupling effect on the mode I dynamic fracture toughness (DFT). The results show that DFT is positively correlated with impact velocity at 20 °C, −40 °C and −60 °C. However, at −80 °C, the rate effect is reversed. Moreover, DFT decreases with decreasing temperature regardless of impact velocity. With microscopic analysis, the phenomenon of ductile–brittle transition (DBT) was observed in the failure of the material, and it’s verified by dynamic tensile tests. The ductile–brittle transition temperature (DBTT) of DCI is determined as −39.7 °C by comparing the DFT with the strain energy density (SED) characterization method.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"312 ","pages":"Article 110651"},"PeriodicalIF":4.7,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142657919","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}

{"title":"Influence of steam curing on cyclic triaxial characteristics of recycled aggregate concrete: Experimental analysis and DEM simulation","authors":"Xiangyi Zhu ,&nbsp;Peng Lei ,&nbsp;Xudong Chen ,&nbsp;Jingwu Bu","doi":"10.1016/j.engfracmech.2024.110643","DOIUrl":"10.1016/j.engfracmech.2024.110643","url":null,"abstract":"<div><div>The engineering application of steam-cured recycled aggregate concrete (often in a cyclic triaxial stress state) can not only improve the recycling efficiency of resources, but also accelerate the construction progress. In this paper, we adopt a combination of laboratory experiments, theoretical analysis and numerical simulation to study the cyclic triaxial characteristics of recycled aggregate concrete (RAC) under different curing regimes (20℃, 40℃, 60℃ and 80℃). The results indicate that as the steam curing temperature increases, the internal damage caused by high temperature continues to intensify, and the cyclic triaxial failure mode of RAC transitions from shear failure to compression failure, and its peak strength, dynamic elastic modulus, and dilatancy angle all show a downward trend. A linear prediction model is established based on the strong correlation between peak strength and steam curing temperature. As the loading cycles increase, the dynamic elastic modulus and dilatancy angle of RAC show exponential and linear downward trends respectively, and the decline rate increases with the increase of steam curing temperature, and the prediction models for dynamic elastic modulus and dilatancy angle are established based on quantitative relationships between variables. On the basis of experimental analysis results, a cyclic triaxial DEM model considering real recycled aggregates is established by introducing steam-cured damage indexes into the mesoscopic parameters, and its applicability in predicting cyclic triaxial mechanical properties of RAC under different curing regimes is verified. The research outcomes can save a lot of test cost and time consumption for developing steam-cured concrete with better performance, and have important theoretical guidance and practical significance for the wide application of steam-cured concrete.</div></div>","PeriodicalId":11576,"journal":{"name":"Engineering Fracture Mechanics","volume":"312 ","pages":"Article 110643"},"PeriodicalIF":4.7,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142657817","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}