Article
Materials Science, Multidisciplinary
Xingfeng Liu, Di Li, Hui Song, Zipeng Lu, Hongjian Cui, Ning Jiang, Jiachuan Xu
Summary: This paper investigates the effect of temperature on the damage parameters of DP590 steel under warm forming using the extended GTN model. The study determines the damage parameters at different temperatures through experiments and numerical simulation, and analyzes the changes in shear damage and void damage under different conditions. The influence of shear damage and void damage on competitive fracture failure under warm forming is discussed, and a competitive failure equation considering temperature and stress triaxiality is proposed.
Article
Nuclear Science & Technology
Chih-Cheng Chang, Dmitry Terentyev, Alexander Bakaev, Aleksandr Zinovev, Daniele Del Serra, Patricia Verleysen, Thomas Pardoen
Summary: This article investigates the equivalence and interchangeability of miniaturized flat and cylindrical tensile samples for the extraction of the tensile properties. The experimental-computational study focuses on the determination of the post-necking properties. The results show that the finite element simulations accurately reproduce the experimental data for flat tensile samples, but have a reduced accuracy for cylindrical samples due to a difference in the stress triaxiality distribution.
FUSION ENGINEERING AND DESIGN
(2023)
Article
Engineering, Mechanical
Chenchen Zhao, Tao Wang, Zixuan Li, Jianglin Liu, Zhiquan Huang, Qingxue Huang
Summary: In this research, a modified Gurson-Tvergarrd-Needleman (GTN) model was proposed to predict the behavior of edge cracks in rolled Mg alloys and analyze the mechanisms of crack formation and evolution. Physical experiments and FE analysis accurately showed the morphology and location of cracks during the rolling process, and revealed that high stress triaxiality was a significant cause of edge cracking. Based on this, an edge-constraint rolling process was proposed to effectively avoid edge cracks and provide a basis for optimizing the rolling deformation process of Mg alloys.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Engineering, Mechanical
Hongfei Wu, Xincun Zhuang, Wen Zhang, Zhen Zhao
Summary: In this study, an anisotropic Gurson-Tvergarrd-Needleman (GTN) model considering anisotropic void behaviors was proposed to accurately predict anisotropic ductile fracture. The effect of high stress triaxiality on void nucleation was considered through an additional stress dependent factor, and anisotropic stress triaxiality was adopted. A new formulation related to anisotropic critical damage was proposed to describe the difference in damage accumulations along different material orientations. Uniaxial tension experiments were performed to validate the proposed model, and remarkable improvement was achieved when considering the contribution of high stress triaxiality, anisotropic void nucleation, and critical damage in the modeling of anisotropic ductile fracture.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Mechanics
Noe Brice Nkoumbou Kaptchouang, Yann Monerie, Frederic Perales, Pierre-Guy Vincent
Summary: The study focuses on micromechanical modeling and simulation of crack initiation and propagation in ductile materials using a cohesive-volumetric approach. The proposed cohesive zone model is based on a micromechanical approach and is implemented in the XPER computer code. The efficient cohesive-GTN model is highlighted for its direct derivation of mechanical parameters from the micromechanical approach.
ENGINEERING FRACTURE MECHANICS
(2021)
Article
Engineering, Multidisciplinary
Aditya Kumar, Naveen, Kanwer Singh Arora, Harpreet Singh, Rahul Chhibber
Summary: The GTN model parameters have been estimated for API X80 linepipe steel, and these parameters and mesh size are transferable. However, fracture data cannot be transferred from lab specimens to component level, so local fracture approaches are used for damage prediction.
INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING
(2022)
Article
Construction & Building Technology
Rui Yan, Haohui Xin, Milan Veljkovic
Summary: The study focuses on the ductile failure of cold-formed S700 material using the GTN damage model. RVE models with varying void volume fractions investigate the pressure dependency of deviatoric limit stress. Through calibration of parameters, an equation for determining q(1) for different void volume fractions is proposed.
JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH
(2021)
Article
Materials Science, Multidisciplinary
Leticia dos Santos Pereira, Gustavo Henrique Bolognesi Donato, Miguel Mattar Neto
Summary: A complete understanding of stress triaxiality and stress concentration is crucial for ensuring structural safety. Mechanical tests combined with numerical simulations were used to study stress triaxiality. Different notches were tested and the results were simulated using Abaqus/Explicit 2020 software. The stress triaxiality varied with strain, and the presence of a notch influenced the distribution of stress triaxiality.
MATERIALS RESEARCH-IBERO-AMERICAN JOURNAL OF MATERIALS
(2023)
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
Yue Yin, Wenjia Qin, Tao Ma, Jinghan Bai
Summary: This paper proposes a cyclic GTN (C-GTN) model for predicting the ultra-low cycle fatigue (ULCF) of materials. By considering the evolution of microvoids and the effect of cumulative plastic strains on ductile fracture, this model can better describe the behavior of materials. The applicability of the C-GTN model is validated using a VUMAT subroutine.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Engineering, Civil
Huakun Deng, Yunfei Mao, Guangyao Li, Xu Zhang, Junjia Cui
Summary: This study investigates the high-speed fracture problem of aluminum alloys in electromagnetic forming process through experiments and model establishment. The results show that the fracture strain is significantly influenced by strain rate. The established fracture model accurately predicts high-speed fracture and verifies the effectiveness of the failure criteria in electromagnetic flanging process.
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING
(2022)
Article
Engineering, Mechanical
Jianqiu Liu, Minsheng Huang, Zhenhuan Li, Lv Zhao, Yaxin Zhu
Summary: In this study, the growth of microvoids in polycrystals under finite deformation was investigated, revealing significant influences of crystallographic orientation of grains and local heterogeneous polycrystalline microstructure on microvoid growth. Additionally, the size ratio of microvoid to voided grain was found to heavily influence microvoid growth, indicating a strong size effect in heterogeneous polycrystals.
INTERNATIONAL JOURNAL OF PLASTICITY
(2021)
Article
Materials Science, Multidisciplinary
Weitao Jia, Lijuan Wang, Lifeng Ma, Huaying Li, Hongbo Xie, Yuan Yuan
Summary: The study investigated the influence of temperature, strain rate, and stress state on the deformation behavior of twin-roll casting AZ31 alloy, establishing a mathematical model to determine critical fracture strain and predict crack initiation. This research provides valuable insights for predicting forming limits during plastic deformation of the alloy under complex stress states.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
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
Engineering, Manufacturing
Sheng Cai, Lin Chen
Summary: This study provides numerical and experimental investigations of a blanking process using a shear-enhanced Lemaitre's damage model. The model was successfully applied to predict cutting force and edge geometry under different parameters. Various tests were conducted to characterize damage and closure parameters, and finite element models were validated through comparison with experimental results. A deformation analysis of a circular work piece was also performed to study the effects of blanking conditions on part morphology and stress distribution.
ADVANCES IN MANUFACTURING
(2021)
Article
Mechanics
Shakir Gatea, Hengan Ou, Bin Lu, Graham McCartney
ENGINEERING FRACTURE MECHANICS
(2017)
Article
Materials Science, Multidisciplinary
Y. Q. Wang, S. J. Clark, V. Janik, R. K. Heenan, D. Alba Venero, K. Yan, D. G. McCartney, S. Sridhar, P. D. Lee
Article
Materials Science, Multidisciplinary
Shakir Gatea, Hengan Ou, Graham McCartney
MATERIALS CHARACTERIZATION
(2018)
Article
Materials Science, Multidisciplinary
B. Cacciapuoti, Andy Morris, Wei Sun, David Graham McCartney, Jeff Hulance
MATERIALS AT HIGH TEMPERATURES
(2019)
Article
Engineering, Manufacturing
Shakir Gatea, Bin Lu, Jun Chen, Hengan Ou, Graham McCartney
INTERNATIONAL JOURNAL OF MATERIAL FORMING
(2019)
Article
Chemistry, Physical
Jingyi Mo, Enyu Guo, D. Graham McCartney, David S. Eastwood, Julian Bent, Gerard Van Dalen, Peter Schuetz, Peter Rockett, Peter D. Lee
Article
Automation & Control Systems
Zhiyuan Yang, Fei Chen, Shakir Gatea, Hengan Ou
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2020)
Article
Materials Science, Multidisciplinary
Yuanbo T. Tang, Chinnapat Panwisawas, Joseph N. Ghoussoub, Yilun Gong, John W. G. Clark, Andre A. N. Nemeth, D. Graham McCartney, Roger C. Reed
Summary: New grades of gamma/gamma' nickel-based superalloy for the additive manufacturing process were designed using computational approaches, with processing trials carried out using powder-based selective laser melting. The superior processability and mechanical behaviour of the new alloys were demonstrated through microstructural characterisation, calorimetry and hot tensile testing. Suggestions for refinements to the modelling approach were also made.
Article
Automation & Control Systems
Shakir Gatea, Hengan Ou
Summary: The study analyzed the overall surface roughness of a hyperbolic truncated cone formed by the SPIF process, finding that the surface roughness changes with the deformed part height and rough surface could be produced in regions of high stress and low plastic strain.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2021)
Article
Automation & Control Systems
Shakir Gatea, Thanaa Abdel Salam Tawfiq, Hengan Ou
Summary: The investigation focuses on enhancing the ductility of Al/SiC particle composite sheets through annealing treatments in order to enable successful deformation under single point incremental forming. Different forming parameters can result in greater formability and fracture depth during the SPIF process.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Nanoscience & Nanotechnology
Yuanbo T. Tang, Anh Hoang Pham, Shigekazu Morito, D. Graham McCartney, Roger C. Reed
Summary: This study investigates the solid-state growth of M7C3 carbide at different interfaces in an austenitic Ni-Cr-Fe alloy using high temperature confocal laser scanning microscopy and 3D tomographic technique. The carbide develops dendritic morphology and grows laterally across the free surface via a diffusion-assisted mechanism. The study also confirms the direct connection between surface carbides and dendritic carbide at grain boundaries.
SCRIPTA MATERIALIA
(2022)
Article
Materials Science, Multidisciplinary
Ashish Arote, Junji Shinjo, D. Graham McCartney, Roger C. Reed
Summary: To accurately simulate the free dendritic growth problem, a computationally efficient, accurate, and elegant cell capturing method termed limited circular neighbourhood (LCN) is proposed. The LCN method is able to reduce artificial grid anisotropy and capture growth orientation accurately, resulting in reduced mass loss and shape error compared to other methods. It is also demonstrated that the LCN method is effective for both free dendrite growth in a pure material and constrained dendritic growth in a binary alloy with multiple growth sites.
COMPUTATIONAL MATERIALS SCIENCE
(2023)