Article
Engineering, Mechanical
Wang Dou, Zejian Xu, Hongzhi Hu, Fenglei Huang
Summary: This work proposes a novel plasticity model that considers the effects of stress state, strain, strain rate, and temperature on flow stress. Experimental work on Ti-6Al-4V alloy was conducted to determine plastic behaviors and a new plasticity model was compared with the JohnsonCook model, showing higher accuracy and improvement. The new model was implemented in ABAQUS/Explicit and showed significant improvement in simulation results compared to the JC model.
INTERNATIONAL JOURNAL OF IMPACT ENGINEERING
(2021)
Article
Construction & Building Technology
Xiaonong Guo, Shaohan Zong, Jindong Zhang, Yu Fang
Summary: The use of aluminum alloys in construction applications, especially in public buildings, has increased significantly. It is important to have a plasticity constitutive model that accurately describes the elastoplastic behavior of aluminum alloys under complicated stress states in order to simulate aluminum alloy structures under various working conditions. This study proposes and validates a plasticity constitutive model suitable for extruded aluminum alloys under complicated stress states, taking into account the effects of stress triaxiality and Lode angle. The proposed model showed high accuracy in predicting the response of structural extruded aluminum alloys.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Engineering, Mechanical
Meiduo Chen, Songlin Xu, Liangzhu Yuan, Chunhe Miao, Jianhua Lu, Hao Ma, Guangfa Gao, Pengfei Wang
Summary: This study investigates the strain rate sensitivity and stress state effects on the mechanical behavior of concrete under dynamic load. Through true triaxial Hopkinson tests, the strain rate effect and intermediate principal stress effect of concrete are studied, along with the influence of heterogeneity. The experiments show that the triaxial data align well with the dynamic M-C strength, while the biaxial data deviates significantly from it, indicating the presence of an intermediate principal stress effect.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Mechanics
Xiaofan Liu, Shen Yan, Kim J. R. Rasmussen, Gregory G. Deierlein
Summary: This paper discusses the effect of the Lode angle on the fracture strain of steels and proposes a new fracture model, LMVGM, which combines the effects of stress triaxiality and the Lode angle parameter for accurate prediction of fracture strain.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Engineering, Civil
Wenyu Cai, Guo-Qiang Li
Summary: Fire is a dangerous disaster for high-strength steel structures, as it can lead to unexpected failure or collapse. This study conducted tests on Q690 steel specimens exposed to high temperatures and evaluated their post-fire behavior considering stress state effects.
THIN-WALLED STRUCTURES
(2023)
Article
Mechanics
Xiaofan Liu, Shen Yan, Kim J. R. Rasmussen, Gregory G. Deierlein
Summary: This study investigates the influence of stress triaxiality on fracture strain and fills the gap in validating the exponential model under medium to low stress triaxiality. By comparing test specimens with similar Lode angle parameters, the effect of stress triaxiality is examined within each group. The results verify that the void growth-based exponential function accurately reflects the effect of stress triaxiality for steels over a broad range of stress triaxialities.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Mechanics
Suranjit Kumar, M. K. Samal, P. K. Singh, J. Chattopadhyay
Summary: This paper aims to predict the ductile fracture in low alloy steel specimens with pure tension, pure shear and combined shear-tension type loading using modified Madou-Leblond (MML) porous plasticity model proposed by the present authors. The MML model includes the effect of localised mode of plastic deformation in a narrow band and damage parameter contributions due to void growth process and shear localisation process. The numerical simulations results obtained using MML model has been compared with those of experiments, showing good performance in predicting material softening behaviour and critical fracture location.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Engineering, Multidisciplinary
Sina Abrari Vajari, Matthias Neuner, Prajwal Kammardi Arunachala, Andy Ziccarelli, Gregory Deierlein, Christian Linder
Summary: Phase field models for ductile fracture have been widely studied, but most existing methods only consider the effects of plastic deformation and neglect the multi-axial stress states in practical designs. In this work, a thermodynamically consistent phase field method coupled with finite strain plasticity is proposed to address this issue. The Stress-Weighted Ductile Fracture Model (SWDFM) is utilized to capture the coupling between plasticity and stress states. The excellent performance of the SWDFM in predicting ductile crack initiation motivates its incorporation into the phase field approach for predicting crack initiation and propagation.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2022)
Article
Construction & Building Technology
Mingxu Shang, Hua Yang, Andi Su, Yuyin Wang
Summary: This study investigates the stress-state and strain-rate dependent ductile fracture initiation property of S690 high-strength steel through experiments and simulations. Various types of specimens are tested, and the Cowper-Symonds-type rate correction term is considered in the yield function and ductile fracture initiation locus. Linear and non-linear damage accumulation evolutions are discussed for different loading conditions. The proposed stress-state and strain-rate dependent ductile fracture model is validated through a hybrid experimental and numerical approach.
JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH
(2023)
Article
Construction & Building Technology
Qun He, Michael C. H. Yam, Zhiyang Xie, Xue-Mei Lin, Kwok-Fai Chung
Summary: In this study, it is shown that the classical J2 flow theory is inappropriate for describing the plastic behavior of structural steels under different stress states. A numerical framework is proposed to characterize the strain hardening and ductile fracture initiation considering the effect of stress states. The validity of the proposed model is verified through single element tests and existing test results.
STEEL AND COMPOSITE STRUCTURES
(2022)
Article
Engineering, Mechanical
Zengli Peng, Haisheng Zhao, Xin Li
Summary: In this study, a new uncoupled ductile fracture model is established in the stress space by considering key factors affecting the initiation of ductile fracture. The proposed model is validated through experimental tests and compared with four typical ductile fracture criteria, showing good stability and accuracy in predicting fracture strain, especially in high stress triaxiality range. The asymmetry of the fracture locus and the realistic stress space are also discussed at the end.
INTERNATIONAL JOURNAL OF PLASTICITY
(2021)
Article
Mechanics
Xiao-li Tian, Jie Guo
Summary: The study found that the fracture strain of 6061-T651 aluminum alloy materials decreases with the increase of stress triaxiality and is related to the Lode angle parameter. Temperature has a significant influence on fracture strain, especially above 250 degrees C. The strain rate has no significant effect on the fracture strain of 6061-T651 aluminum alloy.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Mechanics
Zengli Peng, Haisheng Zhao, Xin Li, Lin Yuan, Tong Zhu
Summary: This study focuses on the ductile fracture behavior of X80 pipeline steel through experimental and numerical approaches. Nineteen experiments are conducted, including uniaxial tension, plain strain tension, pure shear, and shear plus tension/compression. Three fracture modes are observed, and a hybrid testing-FE method is used to determine the post-necking strain hardening curve. Ductile fracture parameters are obtained through parallel computations in Abaqus. The results show that a newly proposed model performs better than the other two calibrated models in terms of stability and accuracy for fracture prediction.
ENGINEERING FRACTURE MECHANICS
(2023)
Article
Materials Science, Multidisciplinary
Nathan Spulak, Jeremy Seidt, Amos Gilat
Summary: The ductile fracture behavior of 2024 aluminum under unequal in-plane biaxial tension and out-of-plane compression is studied using a novel experimental design and numerical simulations. Fracture is observed directly during loading in unbacked specimens and using interrupted testing and acoustic emissions in tests with a backing plate. The plasticity model used in the simulations is validated by matching the simulated response with experimental data, and the equivalent plastic fracture strain is determined for various stress states.
MECHANICS OF MATERIALS
(2023)
Article
Engineering, Mechanical
Dhanraj Rajaraman, Vincent Keim, Kannaki Pondicherry, Aida Nonn, Stijn Hertele, Dieter Fauconnier
Summary: Abrasive wear is a common issue that affects the lifetime of machine components, with empirical models linking wear resistance to material hardness. However, the complex stress trajectories during scratch abrasion suggest the need for detailed material damage models. This study evaluates stress states and mechanisms during scratch abrasion, highlighting the importance of selecting suitable damage models for accurate finite element analysis.
Article
Materials Science, Multidisciplinary
Baihong Chen, Changyue Liu, Zengting Xu, Zhijian Wang, Rui Xiao
Summary: In this study, both polydomain and monodomain liquid crystal elastomers (LCEs) were synthesized and their shape change with temperature under a certain stress level was characterized. A thermo-order-mechanical coupling model was developed to predict the shape change of LCEs, showing good consistency with experimental results.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Peng Wang, Fei Xu, Yiding Wang, Jun Song, Cheng Chen
Summary: This study investigates the interplay of super-screw dislocations and coherent twin boundary (CTB) in Ni3Al using molecular dynamics simulations and dislocation continuum theory. Various interaction mechanisms are observed depending on the stress and dislocation gliding pathways. A continuum model framework is developed to evaluate the critical shear stress required for CTB to accommodate dislocations along different pathways, considering the effects of anti-phase boundary (APB) and Complex Stacking Fault (CSF). The study suggests that the resistant force of CTB against all gliding dislocations is a more appropriate metric for quantifying its strength.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Chenyu Du, Haitao Cui, Hongjian Zhang, Zhibin Cai, Weikuo Zhai
Summary: A thermal-elastoplastic phase field model was developed to simulate thermal fatigue crack growth. The accuracy and availability of the model were verified through typical examples. The results indicate that the proposed model effectively simulates the process of thermal fatigue crack propagation in elastoplastic solids. The appropriate regularization length needs to be determined based on experimental results.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
J. Carlsson, A. Kuswoyo, A. Shaikeea, N. A. Fleck
Summary: The sensitivity of the compressive strength of a polymeric Kelvin lattice to the presence of an epoxy core is investigated both experimentally and numerically. The study shows that the epoxy core prevents the formation of crush bands in the lattice and changes its deformation mode. At finite strain, the strength of the lattice is degraded by bending failure and cracking of the struts and adjacent core, leading to the formation of vertical fissures.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Saptarshi Paul, Anurag Gupta
Summary: In this study, we investigate the geometry and mechanics of the buckled orthotropic von Karman elastic plate with free boundary condition, in the presence of an isolated positive or negative disclination. The shape of the buckled plate is cone-like for a positive disclination and saddle-like for a negative disclination. With increasing orthotropy, the shape of the buckled plate becomes more tent-like and the Gaussian curvature spreads along the ridge of the tent. The stress fields are focused in the neighborhood of the defect point and the ridge, indicating that most of the stretching energy is accommodated in these singular regions.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Antu Acharya, Vikram Muthkani, Anirvan DasGupta, Atul Jain
Summary: This study proposes filler-based and infill-based strategies for creating auxetic lattices with enhanced stiffness. The elastic properties of the sinusoidal re-entrant honeycomb lattice are developed and validated using finite element models. Parametric studies are conducted to find combinations leading to enhanced stiffness with minor loss in auxeticity. The results demonstrate the possibility of achieving a significant increment in stiffness while retaining significant auxeticity. The proposed approaches outperform existing approaches in terms of stiffness and auxeticity.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Biswajit Pal, Ananth Ramaswamy
Summary: This study presents a multi-scale approach to simulate the shrinkage and creep of concrete, addressing the limitations of existing macroscopic prediction models due to the heterogeneous nature of concrete. The model is validated with experimental data and compared to national codes and macroscopic models, demonstrating its effectiveness in overcoming the gaps in existing models.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Akash Kumar Behera, Mohammad Masiur Rahaman, Debasish Roy
Summary: Ceramics have attractive properties but low fracture toughness is a major drawback. There is interest in improving the mechanical performance of ceramics by tailoring residual stresses. However, there is a lack of computational models that can accurately predict crack paths and quantify the improved fracture toughness.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Bineet Kumar, Sandeep Kumar Dubey, Sonalisa Ray
Summary: This study aims to develop an energy-based theoretical formulation for predicting the evolution of the fracture process zone in concrete under fatigue loading. Experimental results and calibrations indicate that the specimen size and aggregate size affect the fracture behavior and process zone length of concrete.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Zheliang Wang, Hao Sheng, Xinyi Lin, Yifan Rao, Jia Liu, Nanshu Lu
Summary: In this study, an analytical framework is proposed for investigating the behavior of laminated beams with any number of layers under various bending conditions, and the theory is validated through finite element analysis. It was found that the number of layers, applied deformation, layer properties, and layer aspect ratio have an impact on the equivalent flexural rigidity.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Michael Schwaighofer, Markus Konigsberger, Luis Zelaya-Lainez, Markus Lukacevic, Sebastian Serna-Loaiza, Michael Harasek, Florian Zikeli, Anton Friedl, Josef Fussl
Summary: In this study, nanoindentation relaxation tests were re-evaluated on five industrial lignins extracted from different feedstocks. It was found that the viscoelastic properties of all tested lignins were practically identical and independent of the feedstock and the extraction processes.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Tian Han, Dandan Qi, Jia Ma, Chaoyang Sun
Summary: In this study, a generative design method was used to propose new modified lattice structures suitable for tensile and compressive loading conditions. By conducting experimental and finite element analyses, it was confirmed that the derived structures have improved load-bearing capacity and energy absorption compared to the original structures. The effects of shape parameters on mechanical properties were also discussed.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Wenbin Zheng, Jay Airao, Ramin Aghababaei
Summary: Spinodal decomposition of Ti1-xAlxN crystal structure significantly affects their physical properties. This study uses three-dimensional molecular dynamics simulations to investigate the phase transformation mechanism and surface finish during material removal in TiAlN. The simulations reveal that the aluminum content and cutting depth have a significant influence on the phase transformation process through spinodal decomposition.
MECHANICS OF MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Atasi Ghosh
Summary: The micro-mechanism of low cycle fatigue deformation behavior has been summarized and the recent development in the approach of numerical simulation of cyclic stress-strain behavior of polycrystalline metallic materials at multi-scale has been discussed.
MECHANICS OF MATERIALS
(2024)