Article
Materials Science, Multidisciplinary
Aanchal Yadav, Gagandeep Bhardwaj, R. K. Godara
Summary: This paper discusses the fracture analysis of CNT reinforced FG structures under thermo-mechanical load and finds that increasing the CNT content can delay fracture occurrence.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2022)
Article
Engineering, Mechanical
Yehui Cui, Xiangguo Zeng, Vincent B. C. Tan, Zhilang Zhang
Summary: In this study, the dynamic fracture performances of NiTi alloy were comprehensively investigated through experiments and simulations. The fracture behavior was found to exhibit quasi-brittle features. A novel constitutive model was proposed to accurately reproduce the crack propagation process. Additionally, it was demonstrated that a smaller grain size could improve the intergranular fracture toughness.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Mechanics
Isabella Mendoza, Daniel Drury, Andrew Matejunas, Jacob Ivy, Stylianos Koumlis, Peter Jewell, Geoff Brennecka, Leslie Lamberson
Summary: The study found that under dynamic conditions, poled samples exhibited a 70% greater fracture toughness compared to de-poled specimens, with the critical stress intensity factor increasing seven to tenfold. Impulsively loaded samples showed higher fracture toughness, likely due to microcracking and potentially phase transformations at the crack tip. The increase in fracture toughness from poling is likely due to dynamic domain reorientation providing crack tip shielding.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Materials Science, Multidisciplinary
Arjun Sreedhar, Suraj Ravindran, Gyan Shankar, S. Suwas, R. Narasimhan
Summary: Static and dynamic fracture experiments on rolled AZ31 Mg alloy revealed different fracture mechanisms under different loading conditions, with an increase in twin density and associated texture under dynamic loading, leading to a significant increase in fracture toughness at high loading rates.
Article
Mechanics
Haozhe Xing, Fang Xie, Mingyang Wang, Kaidi Xie, Yanyu Qiu
Summary: This study investigates the evolution of fracture process zone (FPZ) and its effect on crack initiation toughness in dynamic rock fracturing. The results show that the FPZ in dynamic fracturing initiates earlier than in quasi-static cases, with a width independent of the loading rate. The LEFM theory underestimates the crack initiation toughness.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Engineering, Petroleum
Meng Meng, Stefan Miska, Mengjiao Yu, Evren Mehmet Ozbayoglu
Summary: During drilling, cyclic loading can lead to rock fatigue, new methods for predicting rock strength have been proposed, empirical models have been established, and a three-stage behavior during cyclic loading has been observed.
Article
Multidisciplinary Sciences
Ziyang Ning, Guanchen Li, Dominic L. R. Melvin, Yang Chen, Junfu Bu, Dominic Spencer-Jolly, Junliang Liu, Bingkun Hu, Xiangwen Gao, Johann Perera, Chen Gong, Shengda D. Pu, Shengming Zhang, Boyang Liu, Gareth O. Hartley, Andrew J. Bodey, Richard I. Todd, Patrick S. Grant, David E. J. Armstrong, T. James Marrow, Charles W. Monroe, Peter G. Bruce
Summary: All-solid-state batteries with a Li anode and ceramic electrolyte have the potential to significantly outperform current Li-ion batteries. However, the formation and penetration of Li dendrites during charging remain a major challenge. Previous models focused on a single process for dendrite initiation and propagation, but our study reveals that these processes are actually separate and independent.
Article
Engineering, Mechanical
Jinyin Ma, Diyuan Li, Quanqi Zhu, Meng Liu, Qianrong Wan
Summary: Through a series of experiments, it was found that the Mode I fatigue fracture behavior of hard rock is significantly affected by dynamic disturbance, with the nonlinearity degree p increasing with increasing pre-static load levels, and the disturbance frequency having a significant impact on corrected fracture toughness.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2022)
Article
Engineering, Manufacturing
Davoud M. Jafarlou, Bryer C. Sousa, Matthew A. Gleason, Gehn Ferguson, Aaron T. Nardi, Danielle L. Cote, Ian R. Grosse
Summary: The research introduces the cold spray process as a method for additive manufacturing of tantalum and extensively evaluates the material's mechanical properties. While anisotropy in the mechanical properties was observed, the material exhibited high strength and excellent isotropy. The study reveals that the cold spray process is suitable for producing tantalum components.
ADDITIVE MANUFACTURING
(2021)
Article
Materials Science, Ceramics
Jason Sun, Yu Chen, Joseph J. Marziale, Eric A. Walker, David Salac, James Chen
Summary: A three-way coupled thermo-mechanical fracture model is presented to predict the damage of brittle ceramics, in particular a-SiC, over a wide range of temperatures (20-1400?). The model is implemented in MOOSE and divided into three modules: elasticity, damage phase field, and heat conduction. Validation tests are conducted for flexural strength and fracture toughness. The simulation results are in agreement with the experimental data. The parallel computing capabilities of the model are also considered in scalability tests.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Engineering, Geological
Selahattin Akdag, Murat Karakus, Giang D. Nguyen, Abbas Taheri, Qian-Bing Zhang, Jian Zhao
Summary: This paper investigates the relationship between the strain burst mechanism and its dynamic fracture propagation by conducting dynamic fracture toughness tests on thermally treated granite specimens. The results show that the loading rate and temperature significantly affect the initiation toughness and energy partitions in dynamic fracture, and higher temperatures exacerbate the fragmentation degree of granite.
INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
(2023)
Article
Engineering, Mechanical
Yuichi Shintaku, Seiichiro Tsutsumi, Kenjiro Terada
Summary: This paper presents a continuum-damage-model-like constitutive law embedding cohesive cracks with plasticity-induced damage to represent the degradation of strength and ductility of steel under cyclic loading. The proposed model is able to predict the tensile strength and breaking elongation of steel after cyclic loading. Its validity is verified through experiments.
INTERNATIONAL JOURNAL OF PLASTICITY
(2022)
Article
Chemistry, Physical
Dominik Glowacki, Wojciech Mocko, Michal Marczak, Anna Glowacka, Cezary Kraskiewicz
Summary: This paper presents the testing methodology of specimens made of layers of titanium alloy Ti6Al4V in dynamic impact loading conditions. Results show that as the number of layers of titanium alloy increases, the force required for damage initiation and the absorbed energy during plastic deformation also increase, displaying a close to linear relationship.
Article
Mechanics
Jun Xie, Yujie Peng, Zheming Zhu, Mansaier Lin, Ke Xue, Jianping Liu
Summary: This study investigates the effects of loading rate on the dynamic fracture toughness of rock using a scaled modeling method. The results show that the method effectively eliminates the influence of loading amplitudes and model size on fracture toughness, and is able to predict the dynamic fracture toughness. The dynamic fracture toughness exhibits a non-linear increase with loading rate in both the fracture initiation and propagation stages, with a rapid growth in a middle range of loading rates.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Mechanics
Arthur Lintner, Reinhard Pippan, Martin Schloffer, Anton Hohenwarter
Summary: Intermetallic titanium aluminides (TiAl) have great potential for high temperature applications due to their high specific strength, creep, and oxidation resistance, but their use for structural components is limited by low ductility and fracture toughness. A study was conducted to determine the fracture toughness of a third generation TiAl-alloy over a wide range of loading rates, and it was found that the dynamic fracture initiation toughness slightly increases up to loading rates of KI = 106 MPa root m/s.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Engineering, Mechanical
Behrad Koohbor, Addis Kidane, Wei-Yang Lu, Michael A. Sutton
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2016)
Article
Materials Science, Characterization & Testing
Behrad Koohbor, Addis Kidane, Wei-Yang Lu
Article
Instruments & Instrumentation
S. Ravindran, A. Tessema, A. Kidane
REVIEW OF SCIENTIFIC INSTRUMENTS
(2016)
Article
Engineering, Mechanical
Behrad Koohbor, Addis Kidane, Michael A. Sutton, Xing Zhao, Silas Mallon
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2017)
Article
Materials Science, Characterization & Testing
Addis Tessema, Addis Kidane
Article
Materials Science, Characterization & Testing
Addis Tessema, Dan Zhao, Joseph Moll, Shansan Xu, Ronggui Yang, Chen Li, Sanat K. Kumar, Addis Kidane
Article
Mechanics
Behrad Koohbor, Suraj Ravindran, Addis Kidane
COMPOSITE STRUCTURES
(2018)
Correction
Engineering, Mechanical
Behrad Koohbor, Addis Kidane, Michael A. Sutton, Xing Zhao, Silas Mallon
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2018)
Article
Mechanics
Suraj Ravindran, Behrad Koohbor, Peter Malchow, Addis Kidane
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2018)
Article
Materials Science, Multidisciplinary
Peter Malchow, Behrad Koohbor, Suraj Ravindran, Addis Kidane
MECHANICS OF MATERIALS
(2018)
Article
Engineering, Multidisciplinary
Sreehari Rajan, Michael A. Sutton, Roudy Wehbe, Brian Tatting, Zafer Gurdal, Addis Kidane, Ramy Harik
COMPOSITES PART B-ENGINEERING
(2019)
Article
Materials Science, Multidisciplinary
S. Ravindran, V. Gupta, A. Tessema, A. Kidane
EXPERIMENTAL MECHANICS
(2019)
Article
Physics, Applied
S. Ravindran, A. Tessema, A. Kidane, J. Jordan
JOURNAL OF APPLIED PHYSICS
(2019)
Article
Mechanics
Vijendra Gupta, Addis Kidane, Michael Sutton
Summary: Density-graded cellular materials have great potential for impact resistance in structural applications. An analytical closed-form solution has been proposed to predict the response of these materials to rigid body impacts, showing excellent agreement with existing numerical solutions. This solution can be used for parametric studies and designing graded structures to mitigate impact.
THEORETICAL AND APPLIED MECHANICS LETTERS
(2021)
Article
Materials Science, Multidisciplinary
A. Tessema, W. Mitchell, B. Koohbor, S. Ravindran, M. Van Tooren, A. Kidane
JOURNAL OF DYNAMIC BEHAVIOR OF MATERIALS
(2018)
Article
Mechanics
Xiaolong Liu, Kelian Luo, Pengcheng Gao, Tao Cong, Xi Wang, Wenjing Wang
Summary: This paper investigates the formation mechanisms of the zig-zag crack region on the shattered rim of railway wheels. The zig-zag crack region, identified as a typical region for crack propagation in rolling contact fatigue behavior, was observed using scanning electron microscopy and transmission electron microscopy. The formation of the zig-zag morphology is attributed to the periodic deflection of the propagation path relative to the initial propagation plane, caused by the limited plastic deformation zone at the crack tip. Grain refinement and secondary cracks in the zig-zag crack region are a result of the large compressive and shear stresses induced by rolling contact loading.
ENGINEERING FRACTURE MECHANICS
(2024)
Article
Mechanics
Anastasia Iziumova, Aleksei Vshivkov, Ivan Panteleev, Virginia Mubassarova, Oleg Plekhov, Denis Davydov
Summary: The aim of this study was to investigate the correlation between structural, acoustic emission, and thermal characteristics of fatigue crack growth in titanium alloys. Cluster analysis of the acoustic emission signals revealed two different types of signals observed during the fatigue crack development. It was experimentally demonstrated that the stored energy tends to reach an asymptotic value at the final stage of fatigue crack growth and this is correlated with the twinning process intensification in titanium alloy Ti Grade 2. A correlation was assumed between the stages of change in heat flux, the cumulative energy of the first cluster of acoustic emission signals, and the crack length.
ENGINEERING FRACTURE MECHANICS
(2024)
Article
Mechanics
M. Vieira de Carvalho, I. A. Rodrigues Lopes, F. M. Andrade Pires
Summary: This study investigates the numerical challenges of fracture mechanics models within implicit quasi-static frameworks and proposes an instability criterion. The ratio of cohesive to internal power is identified as a crucial factor. Two strategies for handling fracture problems with instabilities are discussed and a comparative assessment is performed. The study also examines more complex material responses, including transformation-induced plasticity effects.
ENGINEERING FRACTURE MECHANICS
(2024)
Article
Mechanics
Thomas Duminy, Aurelien Doitrand, Sylvain Meille
Summary: This study conducted in situ wedge splitting tests on millimeter-size PMMA samples and proposed a method to determine the material tensile strength and critical energy release rate using digital image correlation and a full finite element implementation of the coupled criterion.
ENGINEERING FRACTURE MECHANICS
(2024)
Article
Mechanics
Xin Chang, Xingyi Wang, Chunhe Yang, Yintong Guo, Yanghui Wan
Summary: The influence of cyclic thermal shock and high-temperature acid etching on the Mode I fracture of shale was investigated in this study. It was found that cyclic thermal shock severely degrades the strength and fracture toughness of shale, while high-temperature acid etching treatment improves the fracture toughness. These findings are valuable for optimizing process parameters to reduce initiation pressure in deep shale formations.
ENGINEERING FRACTURE MECHANICS
(2024)
Article
Mechanics
Liaojun Yao, Mingyue Chuai, Zhangming Lyu, Xiangming Chen, Licheng Guo, R. C. Alderliesten
Summary: Methods based on fracture mechanics have been widely used in fatigue delamination growth (FDG) characterization of composite laminates. This study proposes appropriate similitude parameters to represent FDG behavior with different R-ratios.
ENGINEERING FRACTURE MECHANICS
(2024)
Article
Mechanics
Zesheng Zang, Zhonghui Li, Yue Niu, Shan Yin
Summary: This study conducted experiments and recorded signals to investigate the fracture behavior and damage evolution characteristics of coal samples. The results showed that as loading proceeds, the stress, electric potential (EP), and acoustic emission (AE) values increase, and EP and AE signals are excited when stress drops. The fracture behavior of coal samples is altered by flaw inclination, and the destruction mode becomes increasingly complicated. The damage evolution characteristics of coal samples can be evaluated and analyzed by defining the coefficient of variation (CV value) of EP and the b value of AE.
ENGINEERING FRACTURE MECHANICS
(2024)
Article
Mechanics
Clotilde Berdin, Nathalie Prud'homme
Summary: In this study, zirconia layers with different fractions of tetragonal phase and thicknesses were tested for multi-cracking behavior. Cracks perpendicular to the tensile direction were observed, showing a blunting effect into the substrate. The ratio of crack spacing at saturation to layer thickness decreased as the layer thickness increased. Unit cell modeling was used to establish a relationship between crack spacing and layer strength, which fell within the bounds of Hu and Evans model and was found to be insensitive to the tetragonal zirconia fraction.
ENGINEERING FRACTURE MECHANICS
(2024)
Article
Mechanics
Huadong Zhang, Weichen Kong, Y. H. Liu, Yuh J. Chao
Summary: Williams' series expansion crack tip solution in linear elasticity is modified to include a uniform crack face pressure. Practical methods to calculate T-stress from near crack tip stresses are outlined. The analytical results are consistent with numerical results.
ENGINEERING FRACTURE MECHANICS
(2024)
Article
Mechanics
Jiahao Kong, Haoyue Han, Tao Wang, Guangyan Huang, Zhuo Zhuang
Summary: This paper introduces a phase-field model for polymer foam materials by combining the phase-field method with the crushable foam model. The model is calibrated using experimental data and successfully simulates the fracture processes of polyurethane under different loading conditions. The study is important for the engineering applications of polymer foam materials.
ENGINEERING FRACTURE MECHANICS
(2024)
