Article
Engineering, Multidisciplinary
Meiqi Hu, Baozhong Sun, Bohong Gu
Summary: A microstructure model based on fully thermo-mechanical coupling behavior of 3-D braided composites has been proposed for characterizing multiple transverse impact damage. The model incorporates interfacial contact and cohesive debonding, as well as ductile and shear damage, along with thermo-mechanical coupling constitutive equations. Adiabatic temperature rise and interfacial damage are concentrated on the impact surface with local plastic deformation, caused by the heat energy generated in impact interaction leading to thermal expansion of epoxy resin and extra internal stress. Comparisons between braided preforms with and without axial yarns show that axial yarns improve heat energy absorption and impact damage tolerances, while impeding impact damage growth.
COMPOSITES PART B-ENGINEERING
(2021)
Article
Mechanics
Witold Ogierman
Summary: This study presents a time-efficient and accurate method for estimating the effective nonlinear behavior of composites reinforced with misaligned short fibers. By combining a two-stage hybrid homogenization method with a novel formulation of the pseudo-grain discretization method, the proposed approach provides accurate results in both linear elastic and elastic-plastic regimes. The accuracy of the method has been verified through comparisons with reference solutions obtained using established analytical and numerical methods.
COMPOSITE STRUCTURES
(2021)
Article
Mechanics
Yanan Ke, Shuwei Huang, Jinhui Guo, Chaofeng Han, Baozhong Sun, Bohong Gu
Summary: This study examines the effects of thermo-oxidative aging on the mechanical properties of 3-D angle-interlock woven composites, revealing a decrease in mechanical performance, earlier onset of interface damage, and a reduction in surface strain and Poisson's ratio with aging. A finite element model was utilized to explore the mechanisms of mechanical degradation.
COMPOSITE STRUCTURES
(2022)
Article
Materials Science, Multidisciplinary
Jingyu Zhao, Guoxiang Xu, Zan Wang, Jia Ju, Xianli Wang, Mingzhi Chen, Feng Xue, Jian Zhou
Summary: By using arc deposition technology, Fe3Al cladding with better formability, lower dilution rates and fewer defects can be prepared on the steel surface. Compared with linear deposition method, the weave deposition method performs better in different aspects. The weave process can produce faster molten pool velocities, which leads to a smaller contact angle and better bonding strength. This technology has a good prospect for applications.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Dentistry, Oral Surgery & Medicine
Pravinkumar G. Patil, Liang Lin Seow, Rashmi Uddanwadikar, Piyush D. Ukey
Summary: The study aimed to compare the biomechanical behaviors of 2 standard implants and 2 mini implants. The results showed that mini implants generated higher stresses than standard implants, indicating that overdentures retained with standard implants experienced less stress.
JOURNAL OF PROSTHETIC DENTISTRY
(2021)
Article
Engineering, Civil
Y. Jeawon, G. A. Drosopoulos, G. Foutsitzi, G. E. Stavroulakis, S. Adali
Summary: The optimal design and analysis of three-phase graphene/fibre reinforced laminated nanocomposite plates with the aim of maximizing the fundamental frequency is studied in this research. Different sets of design parameters are optimized to assess and compare the effectiveness in maximizing the fundamental frequency. Non-uniform distributions of graphene and fibre as well as fibre orientations are observed to be effective in improving the design efficiency.
ENGINEERING STRUCTURES
(2021)
Article
Engineering, Manufacturing
Tao Zheng, Licheng Guo, Ruijian Sun, Zhixing Li, Hongjun Yu
Summary: This paper investigates the compressive damage mechanisms of 3D woven composites through a coupled numerical-experimental approach, and develops a comprehensive progressive damage model capable of characterizing damage accumulations. The influence of inhomogeneous fiber initial misalignments on compressive performances is parametrically investigated, and the proposed model is validated through corresponding experiments.
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
(2021)
Article
Engineering, Multidisciplinary
Jin Huang, Philippe Boisse, Nahiene Hamila
Summary: The simulation approach proposed in this study accurately determines the state of tufted preforms after forming and takes into account the wrinkles that may occur. The modeling of textile reinforcements and tufting threads by stress resultant shells and rod chains with friction sliding, respectively, along with the consideration of thread bending using neighboring elements, provides a comprehensive understanding of the forming process of tufted preforms.
COMPOSITES PART B-ENGINEERING
(2021)
Article
Mechanics
X. Lu, X. M. Guo
Summary: In this study, a non-local continuum damage model is developed to analyze the progressive failure of laminated composites. The model incorporates an orthotropic non-local integral strategy with two internal length scales, allowing for accurate predictions of damage evolution. Additionally, an interactive damage transfer scheme is proposed to capture the interaction between matrix cracking and interface delamination. The model demonstrates superior performance over conventional methods in predicting the complex failure mechanisms of composite laminates.
COMPOSITE STRUCTURES
(2022)
Article
Materials Science, Multidisciplinary
Jessica Leon de Ulloa, Jesus E. Gonzalez, Ana M. Beltran, Eduardo Peon Aves, Jennifer Rodriguez-Guerra, Yadir Torres
Summary: The aim of this study was to simulate the biomechanical behavior of customized scaffolds fixed by a dental implant on a partially edentulous jaw using the finite element method. The results showed that the customized scaffolds allowed for the recovery of jaw dimensions and reduced stress and strain values in the peri-implant cortical bone. The study found that the diameter of the hole and the porosity of the scaffold did not significantly influence the maximum stress and strain values in the peri-implant bone.
MATERIALS & DESIGN
(2022)
Article
Materials Science, Composites
Gianluca Parodo, Felice Rubino, Luca Sorrentino, Sandro Turchetta
Summary: The aim of this study is to monitor the temperature during the dry drilling of fiber metal laminates used in the aviation field and analyze the influence of cutting speed on temperature trends. Experimental results show that increasing the spindle speed can reduce the temperatures on the tool and flank, and the thermal properties of carbon and glass fibers play a significant role in temperature distribution.
POLYMER COMPOSITES
(2022)
Article
Chemistry, Physical
Mingjie Shen, Baojian Han, Tao Ying
Summary: In this study, finite element analysis using representative volume elements (RVE) was conducted to investigate the micromechanical response and damage behavior of carbon nanotubes/magnesium matrix composites. The research found that carbon nanotubes played a crucial role in enhancing the strength and toughness of the composites through mechanisms such as pullout and bridging.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Mechanics
Dong-Hyeop Kim, Sang-Woo Kim, In Lee
Summary: This study evaluates the deformation of plain woven composite structures induced by the curing process. The effective material property is calculated by considering fabric parameters closely related to the material properties. The theoretical models for predicting the cure behavior and effective material property are incorporated into finite element-based three-dimensional cure simulation. The results revealed the relationship between deformation and composite yarn thickness, as well as the gap between adjacent yarns. The process-induced deformation considering fabric parameters can contribute to improving the manufacturing quality of woven composite structures.
COMPOSITE STRUCTURES
(2022)
Article
Engineering, Multidisciplinary
Junshuo Zhang, Yu Wang, Huaxia Deng, Jianyu Zhou, Shuai Liu, Jianpeng Wu, Min Sang, Xinglong Gong
Summary: The study showed that increasing the concentration of shear thickening fluid (STF) in the composite structure can improve anti-impact and energy absorption properties. Additionally, the addition of carbon nanotubes (CNTs) to STF resulted in the preparation of C-STF/Ecoflex, which had impact sensing function and could be used in multifunctional wearable devices with anti-impact properties.
COMPOSITES PART B-ENGINEERING
(2022)
Article
Polymer Science
Taha Awadallah El-Sayed
Summary: Geopolymer concrete is a substantial type created using various binding ingredients, the study aimed to manufacture new columns with unique features to replace traditional concrete members and reduce costs. Ferrocement geopolymer columns with expanded or welded reinforcement showed higher ultimate failure loads than control columns, while columns reinforced with one-layer of nonmetallic Tensar-mesh obtained higher ultimate failure loads.
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)