Article
Materials Science, Ceramics
Yuqiao Li, Qingxian Li, Chuandong Zuo, Fei Qi, Long Li, Jiachen Wei, Yingfeng Shao, Fan Song
Summary: Measuring the thermal shock crack growth process is crucial for understanding the failure mechanisms and reliability of ceramic materials and structures. In this study, a self-made water quenching system was used to conduct thermal shock tests on alumina and zirconia ceramics. The thermal shock process was recorded using high-speed digital image correlation (DIC). By analyzing the speckle image change on the sample's surface, the process of thermal shock crack initiation and propagation in the two ceramics was determined. It was found that alumina exhibited a faster crack growth rate compared to zirconia, which was attributed to different material parameters. This paper presents an in-situ measurement method that can help identify and predict thermal shock damage in ceramic components.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Mechanics
Mansour Sharafisafa, Zeinab Aliabadian, Faham Tahmasebinia, Luming Shen
Summary: This study investigates the failure patterns of rock-like specimens with pre-existing flaws, utilizing 3D printing technology coupled with digital image correlation (DIC) and bonded particle model (BPM). The presence of filled flaws significantly affects the deformation behavior of the specimens. Different types of flaws lead to various failure modes, with filled specimens showing higher peak loads due to the additional energy required to fracture the filling material.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Mechanics
Jiarong Chen, Xuehan Yin, Changtai Zhou, Muyuan Pan, Zhenyu Han, Tao Zhou
Summary: This study investigated the effect of flaw geometries on the interaction between flaws under compressive-shear loading. The results showed that the axial peak force of flawed specimens was sensitive to the flaw configuration, and the axial peak forces of specimens with parallel flaws were greater than those with coplanar ones. Additionally, it was found that tensile strain primarily influenced crack initiation and propagation, while edge cracks exhibited a combination of tensile and shear strains. Furthermore, novel parameters were proposed to quantitatively characterize the independent effect between coplanar flaws and the reinforced effect between parallel flaws. The findings of this study contribute to a better understanding of the interaction between flaws and rock failure characteristics under compressive-shear loading conditions.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Engineering, Geological
Vikram Vishal, Debanjan Chandra
Summary: This study uses digital volume correlation and quantitative image analysis to investigate the evolution and propagation of cracks in coal. The results demonstrate the crucial role of organic matter in guiding and initiating cracks in coal. Constructive interference between tensile and shear crack systems enhances permeability and reduces tortuosity. Moreover, the tortuosity of the cracks decreases exponentially, while permeability and crack volume fraction increase exponentially with increasing load.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2022)
Article
Materials Science, Composites
Behrad Koohbor, Christopher B. Montgomery, Nancy R. Sottos
Summary: This study developed a multiscale experimental approach combining optical and SEM DIC measurements to experimentally characterize the length scale of the RVE in a carbon fiber composite with a random fiber distribution. The RVE size was determined by the convergence between locally averaged strains and global strains, and it was found to be stress dependent and increased with the evolution of internal damage in the composite.
COMPOSITES SCIENCE AND TECHNOLOGY
(2022)
Article
Chemistry, Physical
Muhammad Ajmal, Cristina Lopez-Crespo, Alejandro S. Cruces, Pablo Lopez-Crespo
Summary: This study presents a novel approach to investigate fatigue-induced crack growth by using the plastic contribution of crack-tip opening displacement (CTODp). CTODp is employed to predict the crack propagation in austenitic stainless-steel. Unlike linear elastic fracture mechanics analysis, this method is useful for tasks beyond small-scale yielding. The approach is based on correlating full-field displacement information with post-processing digital images. A detailed post-processing protocol is described to calculate CTODp, and the results for steel compact-tension specimens show promising findings, as there is a linear relationship between the propagation rate of fatigue cracks and the CTODp range.
Article
Metallurgy & Metallurgical Engineering
Jia-qing Cui, Guo-rui Feng, Zhu Li, Yan-na Han, Cheng Song
Summary: Rock masses with filled flaws provide the main bearing capacity after excavation of pre-grouting roadway. Numerical simulation was used to obtain the excavation stress path, and rocks with filled flaws were loaded under both conventional compression and excavation stress path. The failure process was monitored by digital image correlation method and acoustic emission equipment. The results showed that the excavation stress path caused three simultaneous changes: compaction, non-uniform change in strength near the flaws, and pre-cracking at the flaw tip. These changes affected the initiation angle of cracks, the deformation patterns, and the propagation direction of shear cracks.
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2023)
Article
Optics
Xiaofeng Yan, Rui Zhang, Li Guo
Summary: In this study, a hybrid experimental and computational method based on peridynamics (PD) and digital image correlation (DIC) technique was proposed to investigate the damage and fracture characteristics of ultrahigh-performance concrete (UHPC). The comparison between experimental and simulation results indicates that the proposed model can accurately detect damage and simulate crack propagation.
OPTICS AND LASERS IN ENGINEERING
(2022)
Article
Engineering, Mechanical
J. M. Robles, J. M. Vasco-Olmo, A. S. Cruces, F. A. Diaz, M. N. James, P. Lopez-Crespo
Summary: This work characterizes crack growth in AA2024-T315 by combining different methods and successfully estimates the opening and closure loads, as well as the propagation rate and fracture mode.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Materials Science, Multidisciplinary
Pengjie Wang, Yuqi Mao, Xiang Ji, Jun Chen, Zhenyu Liu
Summary: The slip transfer behavior between grain boundaries (GBs) of high-Mn austenitic steel at 77 K in high cycle fatigue has been investigated. It has been found that slip can transfer through special GBs, including coplanar slip systems and coherent twin boundaries (CTBs). Unlike coplanar slip systems, CTBs allow slip band (SB) propagation but promote the formation of immovable dislocations, which affects the strain compatibility.
MATERIALS TODAY COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Yolanda Manzanares-Negro, Guillermo Lopez-Polin, Kazunori Fujisawa, Tianyi Zhang, Fu Zhang, Ethan Kahn, Nestor Perea-Lopez, Mauricio Terrones, Julio Gomez-Herrero, Cristina Gomez-Navarro
Summary: The study demonstrates that introducing atomic vacancies in MoS2 monolayers can effectively prevent catastrophic failure and increase the material's fracture toughness.
Article
Mechanics
Juan Lu, Yafang Zhang, Libin Duan, Yongjie Huo, Hao Liu
Summary: This study investigated the impact behaviors of RC beams and CFRP-RC beams, finding that the introduction of CFRP can significantly reduce crack widths and deflections while improving impact resistance.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Materials Science, Multidisciplinary
Yue Zhang, Jianfeng Shi, Jinyang Zheng
Summary: The study proposes a method combining acoustic emission and digital image correlation techniques to measure the fracture toughness of polyethylene pipe material, and verifies the effectiveness and accuracy of this method through numerical simulation and experimental testing.
MATERIALS & DESIGN
(2021)
Article
Engineering, Mechanical
Weibing Cai, Yong Li, Ke Gao, Kai Wang
Summary: Through experiments and numerical simulations, the mechanism of crack initiation, propagation, and coalescence in rock-like materials with intermittent flaws under shear loading was investigated. The results showed that cracks with different dip angles have a significant impact on the failure patterns of specimens.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Mechanics
C. Tekoglu, S. Celik, H. Duran, M. Efe, S. Baier-Stegmaier, K. L. Nielsen
Summary: This study investigates the effect of intermetallic particles on the crack propagation mechanisms and fracture surface morphologies when tearing Al 1050 plates. Experimental results suggest that the volume fraction, size, and aspect ratio of intermetallic particles influence whether slanted/cup-cone cracks or cup-cup cracks occur during fracture.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Engineering, Mechanical
Zhuang Sun, Yixin Zhao, Yirui Gao, Sen Gao, Davide Elmo, Xindong Wei
Summary: In this study, the modified semi-circular bending test was used to investigate the fracture toughness of coal samples with different sizes and bedding angles. The results showed that the fracture toughness of coal exhibits size effect and anisotropy. The crack initiation and propagation in hydraulic fracturing of coal seam can be influenced by bedding angles.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Ruiming Zhang, Kai Ma, Wenzhu Peng, Jinyang Zheng
Summary: The fatigue crack growth rates of 4130X steel in different hydrogen concentrations were measured, and the influence of hydrogen on crack behavior was analyzed. Results show that the crack growth rate increases with increasing hydrogen pressure, reaching a threshold at 87.5 MPa.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Hien Do, Phuc L. H. Ho, Canh V. Le, H. Nguyen-Xuan
Summary: In this study, a new method for determining the limit loads of fracture structures using the pseudo-lower bound method with adaptive quadtree meshes is proposed. The method overcomes the volumetric locking problem and handles the challenge of hanging nodes during refinement procedure by using quadtree meshes. The effectiveness of the approach is demonstrated through numerical validation.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Weimin Song, Yuxin Fan, Hao Wu, Liang Zhou
Summary: This study proposed a novel test method to characterize the I-II mixed fracture toughness of asphalt pavement and investigated the effects of reclaimed asphalt pavement (RAP) and loading rate. The results showed that loading rate and inclusion of RAP had positive effects on fracture toughness.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Zida Liu, Diyuan Li, Jianqiang Xia, Quanqi Zhu
Summary: In this study, the influence of flaw inclinations on the failure mechanism of fissured granite specimens was analyzed through a series of experiments. A quantitative method combining deep learning and scanning electron microscope was employed to identify the mesoscopic fracture mechanism of macroscopic cracks. The results indicated that the failure of fissured specimens was mainly caused by tensile stress and shear stress.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Jiabing Zhang, Yiling Chen, Ronghuan Du, Xianglian Zhao, Jun Wu
Summary: This study investigated the mechanical characteristics and crack propagation behavior of sandstone-like samples with single cracks under freeze-thaw cycles. The results demonstrated the significant effects of crack angle and freeze-thaw cycles on the compressive strength and stability of the samples. Confining pressure inhibited the freeze-thaw deterioration, and the acoustic emission signals exhibited good consistency with the stress-strain curves. The simulation results matched well with the experimental results, and five crack propagation modes were proposed.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Felix Boedeker, Pauline Herr, Anders Biel, Ramin Moshfegh, Stephan Marzi
Summary: Cohesive Zone Models with finite thickness are widely used for fracture mechanical modeling. Computational homogenization techniques are crucial for the development of advanced engineering materials. FFT-based homogenization scheme shows potential in reducing computational effort and has practical applications.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Sobhan Pattajoshi, Sonalisa Ray, Yugal Kishor Joshi
Summary: In this work, a novel multi-layer composite structure is proposed for protective shelter design. The dynamic behavior and mechanical performance of the multi-layer composite under projectile impact loading are investigated. The proposed composite target demonstrates enhanced penetration resistance and lesser damage compared to its reinforced concrete monolayer counterpart. An analytical model is also developed to predict the forces transmitted to the lowest layer for design purposes.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
H. M. Shodja, M. T. Kamali, B. Shokrolahi-Zadeh
Summary: This study proposes a semi-analytical method for calculating the stress intensity factor of an internally pressurized eccentric annular crack. By using hypersingular integral equations and conformal mapping, accurate values of SIFs along the crack edges can be obtained. The material properties of the elastic matrix do not affect the SIF values, as demonstrated through the investigation of geometric parameters.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Wen Hua, Zhanyuan Zhu, Wenyu Zhang, Jianxiong Li, Jiuzhou Huang, Shiming Dong
Summary: Accurate assessment and prediction of fracture behavior in cracked materials using mixed mode fracture criteria are crucial in fracture mechanics. This study comprehensively reviewed modified fracture criteria that incorporate T-stress for mixed mode I-II cracks. A comparative analysis was conducted between experimental results and theoretical predictions for five different cracked configurations. The study also discussed the effect of T-stress on crack initiation angle and fracture toughness, providing suggestions. The results showed variations in predictive accuracy across different cracked configurations due to disparities in T-stress. However, similar predictions were observed for semi-circular bend and edge-crack triangular specimens due to their similar biaxial stress ratio B. Different fracture criteria were suitable for different cracked configurations with positive or negative T-stresses.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Qing-qing Shen, Qiu-hua Rao, Wei Yi, Dian-yi Huang
Summary: This study proposes a theoretical approach to forecast multi-crack propagation trajectories in a finite plate. By calculating the stress intensity factor (SIF) and analyzing the influence of crack size, the criteria for crack initiation and propagation in a finite plate are established. Experimental results demonstrate that the SIF of multiple cracks in a finite plate is consistently larger than that of an infinite plate.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Songbai Li, Qiyun Zhu, Zhizhong Lu, Hongzhi Yan, Chu Zhu, Peize Li
Summary: This study investigates the effects of laser heating and laser shot peening on fatigue life of AA2524, and predicts the fatigue life using artificial neural networks and support vector regression models. The results show that laser heating and laser shot peening can significantly improve the fatigue life, and the neural networks have better prediction ability.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
V. Shlyannikov, A. Sulamanidze, D. Kosov
Summary: This paper presents experimental crack-growth data for thermomechanical fatigue conditions in nickel-based alloy components. The crack-growth experimental results are interpreted using finite element analyses and multi-physics numerical calculations. The results show that crack growth rate is slower under isothermal pure fatigue conditions, while it is faster under thermomechanical cyclic deformation conditions.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Tairui Zhang, Xin Ma, Bin Yang, Wenchun Jiang, Zhiqiang Ge, Xiaochao Liu
Summary: This study experimentally investigated the fracture toughness distributions in dissimilar metal welds. The predictions of fracture toughness were made using three criteria and an energy release rate model. The results showed that using the critical strain criterion and ERR model resulted in higher consistency compared to mini-CTs, while the predictions using the critical stress criterion had high dispersion. The study also investigated the source of errors through damage developments and SEM observations.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
Article
Engineering, Mechanical
Yike Dang, Zheng Yang, Xiaoyu Liu, Jianghao Guo
Summary: This study uses discrete element modeling to examine bedded rock failure with parallel defects. It is found that bedding influences crack propagation direction but has limited impact on final failure. Shear failure accumulates at the bridge area and defect tip, while tensile failure occurs during nucleation region development.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2024)
