Article
Nanoscience & Nanotechnology
D. Firneis, S. Wurster, V Nikolic, R. Pippan, A. Hohenwarter
Summary: The fracture properties of pure tungsten sheets were tested at different thicknesses and temperatures. Thinner sheets exhibited refined microstructure and increased fracture toughness. The fracture behavior changed from transcrystalline fracture to mixed transcrystalline and delamination fracture as the thickness decreased. The fracture toughness increased significantly at room temperature, but only slightly at 200 degrees C.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Ceramics
Xi Shi, Nitish Kumar, Jacob L. Jones, Mark Hoffman
Summary: The fracture properties of 0.94(Na0.5Bi0.5)TiO3-0.06BaTiO(3) relaxor ferroelectrics were investigated using the Vickers indentation method and crack tip opening displacement calculation. It was found that unpoled and poled samples exhibited different fracture toughness, with crack growth influenced by residual stress and electromechanical strain. The crack propagation rate was affected by the applied electric field amplitudes, with evidence of a saturation threshold for crack propagation in relaxor ferroelectrics.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2021)
Article
Mechanics
Bodiuzzaman Jony, Sameer B. Mulani, Samit Roy
Summary: The study presents the recovery of shear fracture toughness of damaged thermoset carbon fiber reinforced polymer composite using multiphase thermoplastic healing agents. Bio-mimetic heat-activated intrinsic healing and molten thermoplastic PCL healants were employed to repair micro or macro cracks, achieving recovery of fracture toughness in fractured specimens.
COMPOSITE STRUCTURES
(2022)
Article
Mechanics
Davide Leonetti, Johan Maljaars, H. H. (Bert) Snijder
Summary: Propagation of weld toe cracks under cyclic loading is often predicted using fracture mechanics, with studies aiming to correlate fatigue crack growth rate and threshold condition of small cracks. This paper bypasses the difficulties in quantifying material properties and model parameters by using the square root of area parameter, formulating a linear elastic fracture mechanics based fatigue crack growth model.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Materials Science, Ceramics
Marc Neumann, Kacper Michon, Dirk Endler, Tilo Zienert, Hans Jelitto, Gerold A. Schneider, Christos G. Aneziris
Summary: The fracture behavior of niobium-alumina composites was characterized in this study. Fine-grained Nb-Al2O3 composites with a niobium content of 60 vol% were prepared using castable technique from different alumina sources. The sensitivity towards subcritical crack advance, R-curve behavior, and work of fracture of the sintered castables were tested through slow, cyclic four-point flexure tests. Overall, the investigated composites showed measurable R-curve behavior and were more sensitive towards subcritical crack damage than pure alumina.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Sujata Swain, Rakesh Bhaskar, Balaram Mishra, Mukesh Kumar Gupta, Sonia Sudip Dasgupta, Pawan Kumar
Summary: This study investigated the mechanical, electrical and bio properties of xHAp/(1-x)BZT-BCT composites. It was found that the addition of BZT-BCT improved the mechanical and electrical properties of HAp, leading to increased proliferation of human osteogenic cells.
CERAMICS INTERNATIONAL
(2022)
Article
Chemistry, Physical
Lu Wang, Faqiang Zhang, Chen Chen, Xiang He, Muzaffar Ahmad Boda, Kui Yao, Zhiguo Yi
Summary: This study reports a lead-free ferroelectric ceramic material with narrow bandgaps and large polarizations by utilizing the Jahn-Teller effect of Mn ion. It shows excellent near infrared light induced pyroelectric response and substantial response to infrared irradiation from human body, making it a promising material for human body recognition and light energy harvesting.
Article
Materials Science, Multidisciplinary
Yilun Xu, Weifeng Wan, Fionn P. E. Dunne
Summary: This paper investigates the mechanistic drivers of short fatigue crack growth using theory, computational crystal plasticity, and experimental test and characterization. The study shows that the crack tip stored energy density is non-singular and finite, and depends on the crystal Burgers vector and intrinsic slip strength. Computational methods accurately calculate the stored energy at crack tips, with good agreement obtained for static cracks with the theory. Experimental results demonstrate microstructural sensitivity and good quantitative agreement with both theory and computational modeling, presenting a new microstructurally-sensitive fracture mechanics for short cracks within crystalline materials.
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
(2021)
Article
Mechanics
Simon Laliberte-Riverin, Myriam Brochu
Summary: In this article, a novel method for measuring the stress intensity threshold for hydrogen embrittlement (K-th) in industrial plating conditions was developed. The method involved plating side-grooved CT samples in industrial plating baths and measuring K-th using an incremental step loading methodology. The method was validated with a benchmark case and used on a test case to quantify hydrogen embrittlement. The study concluded that delaying the post-plating bake did not cause hydrogen embrittlement in the studied conditions. The presence of side grooves on CT samples increased the sensitivity to hydrogen embrittlement compared to smooth samples.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Construction & Building Technology
Sepehr Ghafari, Fereidoon Moghadas Nejad
Summary: R-curves provide a means for detailed analysis of crack propagation in engineering materials. In this study, SE(B) tests were conducted on AC mixtures in pure mode I and mixed mode (I/II) states at various temperatures. The research found that increasing shear mode contribution led to a larger stable crack growth region, while unstable crack propagation was more prominent at lower temperatures. Additionally, increasing the NMAS value from 19 mm to 25 mm was observed to enhance cohesive energy and blunting work required for crack initiation, amplifying unstable crack growth at -20°C and -15°C.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Engineering, Mechanical
Johannes Tlatlik, Joerg Hohe, Sebastian Muenstermann
Summary: This study focuses on the issue of brittle fracture in safety-relevant components, such as nuclear reactor pressure vessels. It is found that macroscopic methods cannot reliably assess brittle failure under dynamic loading, due to adiabatic heating processes and local crack arrest events. A detailed study on the evaluation of local cleavage fracture models at elevated loading rates is not available. The present work applies a local model to various dynamic loading conditions and proposes a model adjustment to improve analysis results.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2023)
Article
Materials Science, Ceramics
Sujata Swain, P. Kumar, Sonia
Summary: Lead-free ferroelectric ceramics BaTiO3, Ba(Zr0.2Ti0.8)O-3-0.5(Ba0.7Ca0.3)TiO3, and (Bi0.5Na0.5)TiO3-2.6(BaTiO3)-12(Bi0.5K0.5)TiO3 were synthesized by high energy ball milling assisted solid-state reaction route. Detailed characterizations were carried out on dielectric, polarization-electric field loop, and mechanical properties of these sintered ceramics.
CERAMICS INTERNATIONAL
(2021)
Article
Engineering, Ocean
Arturo Silva-Campillo, J. C. Suarez-Bermejo, M. A. Herreros-Sierra
Summary: The paper investigates the influence of different geometric variables on the fatigue strength assessment of a common ship structural detail, the intersection between the longitudinal stiffener and the double bottom floor. Finite element models are used to analyze the structural behavior and develop fatigue sensitivity curves to determine fatigue life under different loading conditions. Experimental tests are carried out to validate the numerical results and determine the most effective combination.
APPLIED OCEAN RESEARCH
(2023)
Article
Nuclear Science & Technology
Michael Mahler, Stephane Fessi, Jarir Aktaa
Summary: Determining fracture-mechanical properties in the ductile regime, especially for irradiated specimens in fusion reactors, can be challenging due to size restrictions. This study presents a simplified approach using Finite Element Method and cohesive zone model to identify cohesive zone parameters on small specimens for predicting crack-resistance curve and fracture toughness of large specimens. This method eliminates the need for testing big specimens, showcasing its potential applicability in future applications.
NUCLEAR MATERIALS AND ENERGY
(2021)
Article
Mechanics
Tom R. Gallacher, Douglas A. Scarth, Preeti Doddihal
Summary: In-service inspections of Zr-2.5Nb pressure tubes in CANDU nuclear reactors have discovered surface breaking flaw indications classified as manufacturing flaws. Evaluating potential growth of these flaws through an oxide wedging crack growth mechanism is important. This study addresses the conservatism in the established approach by evaluating crack growth due to postulated oxide wedging and showing that fatigue crack growth is not possible under oxide wedge loading.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Materials Science, Multidisciplinary
Fernando Maccari, Alexander Zintler, Thomas Brede, Iliya A. Radulov, Konstantin P. Skokov, Leopoldo Molina-Luna, Oliver Gutfleisch
Summary: The ferromagnetic Mn-Al-C tau-phase has potential to be developed as a permanent magnet, but its metastable nature and decomposition to nonmagnetic phases negatively affect its magnetic properties. This study investigates a novel method using electric current-assisted annealing to obtain pure tau-phase samples. Results show that increasing electric current density reduces the required temperature for phase formation, with a maximum shift of 140 degrees C at 45 A mm(-2). Magnetic properties, however, are not affected by the electric current density. Microstructural analysis reveals the nucleation of the tau-phase at grain boundaries and the presence of twin boundaries during phase growth, resulting in similar extrinsic magnetic properties.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Lukas Schaefer, Konstantin Skokov, Fernando Maccari, Iliya Radulov, David Koch, Andrey Mazilkin, Esmaeil Adabifiroozjaei, Leopoldo Molina-Luna, Oliver Gutfleisch
Summary: A novel magnetic hardening mechanism is described, where modified Nd-Fe-B alloys undergo a solid-state phase transformation to increase coercivity. The presence of FeMo2B2 precipitates after thermal treatment refines the Nd2Fe14B grains and further enhances coercivity.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Materials Science, Ceramics
Ahmed Gadelmawla, Udo Eckstein, Kevin Riess, Yi-Xuan Liu, Ke Wang, Jing-Feng Li, Ken-ichi Kakimoto, Neamul H. Khansur, Kyle G. Webber
Summary: The influence of stress on the small-signal dielectric permittivity and piezoelectric coefficient of polycrystalline lead-free perovskite was studied under different constant uniaxial stress. The study revealed that the electromechanical response was suppressed and phase boundaries shifted under stress. The sensitivity to stress was found to increase with the BZ/BLT ratio in the system, and a significant increase in relative permittivity was observed under compressive stress at temperatures below -50 degrees C.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Multidisciplinary
Franziska Staab, Enrico Bruder, Lukas Scha, Konstantin Skokov, David Koch, Benjamin Zingsem, Esmaeil Adabifiroozjaei, Leopoldo Molina-Luna, Oliver Gutfleisch, Karsten Durst
Summary: Textured nanocrystalline SmCo5-Cu magnets are produced by high-pressure torsion (HPT) of powder blends consisting of SmCo5 and Cu powder. The process overcomes limitations imposed by the phase diagram as in conventional sintering routes, enabling a free selection of the magnetic phase and the grain boundary phase. Increasing number of rotations during HPT leads to structural refinement, increasing coercivity, and amorphous structure of strongly deformed SmCo5 particles. The magnetic hardening is attributed to microstructural refinement and magnetic decoupling of hard magnetic SmCo5 grains by Cu.
Article
Materials Science, Multidisciplinary
Benedikt Beckmann, David Koch, Lukas Pfeuffer, Tino Gottschall, Andreas Taubel, Esmaeil Adabifiroozjaei, Olga N. Miroshkina, Stefan Riegg, Timo Niehoff, Nagaarjhuna A. Kani, Markus E. Gruner, Leopoldo Molina-Luna, Konstantin P. Skokov, Oliver Gutfleisch
Summary: Ni-Mn-based Heusler alloys, especially all-d-metal Ni(-Co)-Mn-Ti, show promising potential for energy-efficient solid-state refrigeration. The study focuses on the transition entropy change and reveals a significant contribution from the structural entropy change, as well as a negative entropy change from the magnetic subsystem at lower temperatures. This phenomenon limits the utilization of these alloys for gas liquefaction at cryogenic temperatures.
Article
Materials Science, Multidisciplinary
Fernando Maccari, Tarini Prasad Mishra, Monica Keszler, Tobias Braun, Esmaeil Adabifiroozjaei, Iliya Radulov, Tianshu Jiang, Enrico Bruder, Olivier Guillon, Leopoldo Molina-Luna, Martin Bram, Oliver Gutfleisch
Summary: Flash spark plasma sintering (flash SPS) is an attractive method to obtain anisotropic Nd-Fe-B magnets with high magnetic performance by starting from melt-spun powders. The process promises electroplasticity and reduced tool wear, while maximizing magnetic properties through tailored microstructure. A parameter study reveals the importance of presintering conditions and preheating temperature on grain size and texture control. The best compromise between remanence and coercivity is achieved through a combination of specific parameters, resulting in a magnet with high energy product.
ADVANCED ENGINEERING MATERIALS
(2023)
Article
Chemistry, Physical
Xingmin Liu, Dan Xu, Hui Ding, Marc Widenmeyer, Wenjie Xie, Maximilian Mellin, Fangmu Qu, Guoxing Chen, Ye Shui Zhang, Zhenyu Zhang, Aasir Rashid, Leopoldo Molina-Luna, Jan P. Hofmann, Ralf Riedel, Dan J. L. Brett, Anke Weidenkaff
Summary: In this study, multiscale designed Co-Mn-O spinel smart pre-catalysts were developed for the conversion of waste plastics. The carbon nanotube composites (CNCs) showed excellent catalytic performance and high H-2 yield. Density functional theory calculations suggested that the Co/MnO catalyst had excellent activity in the dissociation of alkanes. This work provides a new recipe and insights for developing advanced catalysts for waste plastic conversion.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Materials Science, Ceramics
Gina E. Eyoum, Ahmed Gadelmawla, Kyle G. Webber
Summary: The electromechanical behavior and phase transition of lead-free piezoelectric Bi1/2K1/2TiO3 (BKT) can be modified through post-densification thermal treatment. The influence of the annealing atmosphere and cooling rate on the functional properties of BKT was studied. The evaporation of volatile constituents in BKT ceramics was enhanced in an oxygen atmosphere, leading to a decrease in properties. The relaxor-to-ferroelectric transition was suppressed at lower cooling rates, showing the influence of atmosphere and cooling rate on BKT.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Ruijuan Yan, Chen Shen, Marc Widenmeyer, Ting Luo, Robert Winkler, Esmaeil Adabifiroozjaei, Ruiwen Xie, Songhak Yoon, Emmanuelle Suard, Leopoldo Molina-Luna, Hongbin Zhang, Wenjie Xie, Anke Weidenkaff
Summary: The density functional theory (DFT) calculations and experiments have confirmed that the 3d elements occupying the B position in ABC-type half-Heusler compounds are natural over-stoichiometry. In this work, Cu interstitial defects are intentionally introduced to optimize the electrical and thermal transport properties of ZrNiSn compound. The correlations between the phase structure, microstructure, and thermoelectric properties of ZrNiCuxSn (x = 0-0.20) are investigated using various techniques.
MATERIALS TODAY PHYSICS
(2023)
Article
Chemistry, Physical
Juliana G. Maier, Ahmed Gadelmawla, Neamul H. Khansur, Kyle G. Webber
Summary: This study investigated the stress-modulated energy storage properties of lead-free polycrystalline Ba0.85Ca0.15Zr0.1Ti0.9O3 as a function of temperature. The applied uniaxial compressive stress of -160 MPa increased the recoverable energy storage density by 226% to a maximum value of 274 mJ/cm3 and enhanced the energy storage efficiency by approximately 10% to a value of 88.2%. The stress-induced tailoring of energy storage performance can be utilized to enhance the recoverable energy density and reduce the hysteretic losses in other nonlinear dielectric ceramics.
JOURNAL OF MATERIOMICS
(2023)
Article
Engineering, Environmental
Dan Xu, Chen Shen, Xingmin Liu, Wenjie Xie, Hui Ding, Marc Widenmeyer, Maximilian Mellin, Fangmu Qu, Aasir Rashid, Guoxing Chen, Emanuel Ionescu, Ye Shui Zhang, Leopoldo Molina-Luna, Jan P. Hofmann, Dan J. L. Brett, Hongbin Zhang, Anke Weidenkaff
Summary: This article develops advanced bimetallic catalysts and investigates the influence of catalyst ratio on the conversion performance. The activity of the catalysts is rationalized by density functional theory simulations. Additionally, excellent electromagnetic absorption performance of carbon nanocomposites is demonstrated.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Yongchao Chen, Tianshu Jiang, Chuanmu Tian, Ying Zhan, Esmaeil Adabifiroozjaei, Alexander Kempf, Leopoldo Molina-Luna, Jan P. Hofmann, Ralf Riedel, Zhaoju Yu
Summary: A simple and environmentally friendly method was used to synthesize novel nanocomposites, MoP quantum dots (QDs) were used as cores and graphitic carbon as shells. These nanoparticles were dispersed in nitrogen and phosphorus-doped porous carbon and carbon nanotubes substrates. The synthesized sample, MoP@NPC/CNT-900, showed remarkable electrocatalytic activity and durability for the hydrogen evolution reaction in both 0.5 M H2SO4 and 1 M KOH solutions.
Article
Chemistry, Physical
X. F. Liao, A. Aubert, F. Maccari, S. Riegg, S. Ener, E. Adabifiroozjaei, T. Jiang, L. Molina-Luna, K. Skokov, O. Gutfleisch
Summary: Grain boundaries play a crucial role in optimizing coercivity and densification in rare earth permanent magnets during sintering. This study focuses on grain boundary engineering of Nd-based ThMn12 magnets and their nitrides. By adjusting the Nd content and doping with Cu, the grain boundary phase properties can be controlled to enhance the sintering process and improve the relative density. However, the challenge lies in finding a suitable grain boundary for nitrides, as the existing grain boundary phase inhibits liquid-phase sintering.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Ceramics
Jiongjie Liu, Chuanmu Tian, Tianshu Jiang, Emmanuel Ricohermoso, Zhaoju Yu, Emanuel Ionescu, Leopoldo Molina-Luna, Jan P. Hofmann, Ralf Riedel
Summary: A series of silicon oxycarbide ceramics with different carbon content were prepared by thermal pyrolysis and spark plasma sintering. The high carbon content resulted in a porous microstructure, and the sample with 40 wt% carbon content exhibited a porosity of 34% and a specific surface area of 262 m(2)/g at 1600 degrees C. The electrochemical behavior of SiOC was evaluated and showed certain electrocatalytic activity, with the sample containing 10 wt% carbon showing an overpotential of 450 mV vs. RHE at 10 mA.cm(-2) in acid medium. The electrochemical behavior was found to be closely related to the phase composition and microstructure of the ceramics.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Chemistry, Physical
Hui Ding, Sonja Egert, Binxiang Huang, Tianshu Jiang, Leif Carstensen, Edina Sic, Yucheng Liu, Tongqing Yang, Pedro Braga Groszewicz, Hans-Joachim Kleebe, Andreas Klein, Leopoldo Molina-Luna, Gerd Buntkowsky
Summary: The combination of atomic-resolution STEM and solid-state NMR spectroscopy provides unprecedented insight into the structure of antiferroelectric perovskite oxides PbZrO3 and (Pb,La)(Zr,Sn,Ti)O-3. The researchers showed ordered in-plane displacement modulation and out-of-plane information using STEM imaging and Pb-207 NMR spectroscopy. In chemically modified samples, they observed both inhomogeneous displacement modulation and a broad distribution of Pb-207 chemical shifts.
CHEMISTRY OF MATERIALS
(2023)
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)
