Article
Engineering, Manufacturing
Shamik Basak, Sushanta Kumar Panda
Summary: In this paper, the failure limits of aluminum AA5052 sheet material were experimentally investigated and predicted using various uncoupled ductile fracture models. Three sets of experiments were performed to estimate the failure limits under different strain paths. Anisotropic yield theory enhanced the accuracy of prediction for most fracture models. The incorporation of the BW model as a fracture initiation model in FE simulation showed accurate predictions of fracture location and dome height.
JOURNAL OF MANUFACTURING PROCESSES
(2023)
Article
Engineering, Mechanical
Hai Rong, Ping Hu, Liang Ying, Wenbin Hou, Minghua Dai
Summary: The theory of unified visco-plastic damage constitutive equations has been used to model the thermal flow behavior and damage evolution of materials, but the anisotropic properties were often ignored. A novel damage correction formula was proposed in this paper, integrated with a continuum damage model to establish an improved anisotropic damage constitutive model. Material constants were determined based on experimental data for accurate prediction of forming limit curves and hot forming simulations of AA7075 alloy.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Mechanics
Sedigheh Mohamadnejad Zanjani, Ali Basti, Reza Ansari
Summary: Forming limit diagram is an important tool for investigating the plastic deformation ability of sheet metals. It can predict forming limits for various strain paths. Strain path has a significant effect on forming limits, while it has a minor impact on stress forming limit diagrams. By combining crystal plasticity method and Marciniak-Kuczyniski (M-K) method, forming limits of different crystal materials can be anticipated.
MECHANICS OF TIME-DEPENDENT MATERIALS
(2022)
Article
Construction & Building Technology
Yingyao Cheng, Andrew H. C. Chan, Damien Holloway, Gregory Nolan
Summary: This study investigated the compressive behavior of plantation-grown Eucalyptus nitens as a structural material, finding significant anisotropy in compression behavior under different moisture contents and loading directions. Experimental results showed that the stiffness and strength of E. nitens decrease with increasing moisture content in wet conditions, indicating a need for design guidelines for its use in fully saturated applications.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Engineering, Manufacturing
Gauri Mahalle, Nitin Kotkunde, Amit Kumar Gupta, Swadesh Kumar Singh
Summary: This study emphasizes the importance of accurately predicting the fracture limits of high strength superalloys during sheet-metal stretch forming processes. Experimental results show that the forming and fractured limits of IN718 alloy are significantly influenced by variations in processing temperatures, with higher fracture limits observed in the entire deformation region. Seven different ductile fracture models are formulated to predict the fracture loci of IN718 in EPS vs. triaxiality space, with the Oh model showing the best predictability and least average absolute error at all temperatures.
INTERNATIONAL JOURNAL OF MATERIAL FORMING
(2021)
Article
Engineering, Manufacturing
M. M. Shahzamanian, P. D. Wu
Summary: This study presents an analytical forming limit diagram for sheet metals using the M-K method. The Gurson model with damage growth is implemented, and a parametric study is conducted to investigate the effects of parameters on the FLD prediction, showing minimal impact from initial void volume fraction.
INTERNATIONAL JOURNAL OF MATERIAL FORMING
(2021)
Article
Engineering, Industrial
Zhuoyun Yang, Changcai Zhao, Guojiang Dong, Zhiwei Chen
Summary: A new method using DIC-method for the calibration of ductile fracture parameters and a partition optimizing method based on multi-group fracture parameters for FLD establishment have been proposed. It was found that the plastic flow of AA7075-T6 sheet is stress state dependent. The partition optimizing method based on multi-group fracture parameters can better improve the FLD of AA7075-T6.
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2021)
Article
Orthopedics
Yoshimori Kiriyama, Yudai Sato, Yota Muramatsu, Teppei Mano, Katsumasa Tanaka, Kotaro Oshio
Summary: This study aimed to reproduce hairline cracks on the cranium using finite element analysis and X-FEM. By analyzing the resulting crack shapes, potential markers for estimating the loading conditions could be identified.
BMC MUSCULOSKELETAL DISORDERS
(2022)
Article
Automation & Control Systems
Taratip Chaimongkon, Sansot Panich, Vitoon Uthaisangsuk
Summary: This study investigates the formability of aluminum sheet alloy by considering material anisotropy. Through experiments and modeling, the critical fracture strains at different stress states were accurately predicted, demonstrating that the Yld2000-2d-based fracture model can more accurately predict experimental limit strains. The study also successfully proposed an anisotropic Forming Limit Curve (FFLC) and verified it through forming tests, showing that the Lou-Huh model and Yld2000-2d yield function accurately described the forming limits of investigated aluminum sheet.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Saeed Daneshmand, Mohammad Heydari Vini, Jinmer Bravo-Apaza, Nestor Cuba Carbajal, Abhinav Kumar, Sajjad Firas Abdulameer
Summary: This study experimentally investigated the mechanical properties, fracture toughness, and forming limit diagram of Al base composites manufactured by accumulative roll bonding. The results showed that the strength of the composites was significantly enhanced, and their formability improved after the ARB process. Furthermore, the bonding between layers was strengthened with more passes, and the fracture morphology exhibited shear ductile fracture.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Engineering, Manufacturing
Anees Jaleel, C. Sathiya Narayanan
Summary: Incremental sheet forming (ISF) is a progressive and flexible method used for producing sheet metallic components in limited quantities. It has advantages such as higher formability, no need for complex molds, good surface finish, and quick design changes. However, it also has disadvantages including low accuracy and slow process speed. This paper investigates the impact of hole size and other input parameters on sheet formability, correlating it with factors such as crystallite size and dislocation density. Experimental results are compared with simulation results, and numerical and experimental comparisons are made between contour and spiral tool paths.
JOURNAL OF MANUFACTURING PROCESSES
(2023)
Article
Engineering, Mechanical
Piemaan Fazily, Jeong Whan Yoon
Summary: This study proposes a machine learning-based constitutive model for anisotropic plasticity in sheet metals. A fully connected deep neural network (DNN) is constructed to learn the stress integration procedure under the plane stress condition. The performance of the DNN-based anisotropic constitutive model is evaluated for its predictions and compatibility with the trained anisotropic yield function.
INTERNATIONAL JOURNAL OF PLASTICITY
(2023)
Article
Engineering, Industrial
Renhao Wu, Qi Hu, Meng Li, Sheng Cai, Jun Chen
Summary: The study focuses on the force equilibrium, fracture mechanism, and ductile fracture criteria under isotropic yield criterion in ISF process. The proposed modified forming limit model evaluates the influence of process parameters on formability. Additionally, the assessment of damage accumulation and forming height as the formability metric in ISF are also presented.
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2021)
Article
Engineering, Manufacturing
Zhuoyun Yang, Changcai Zhao, Guojiang Dong, Zhiwei Chen, Yufei Sun, Xiangdong Jia
Summary: The study investigates the impact of stress state variation on ductile fracture criterion parameter calibration through tensile tests and simulation analysis. The research results highlight the significant influence of stress state variation on calibration results and provide guidance on selecting notch specimens for parameter calibration.
INTERNATIONAL JOURNAL OF MATERIAL FORMING
(2021)
Article
Materials Science, Multidisciplinary
M. A. Bertinetti, A. Roatta, E. Nicoletti, M. Leonard, M. Stout, J. W. Signorelli
Summary: Digital-image correlation techniques can now be used to measure the forming-limit diagram (FLD) of metal sheets, and the relationship between Bragard-type and temporal FLDs varies depending on the metal's strain-rate sensitivity. The strain paths followed by different metals with the same MK sample geometries were found to be different, indicating the need to account for different FLDs for positive strain-rate sensitive metals.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2021)
Article
Engineering, Mechanical
Hyungrim Lee, Namsu Park, Minki Kim, Myoung-Gyu Lee, Jung Han Song
Summary: Flexible metal forming processes are innovative techniques to meet the needs of mass production and customization. Numerical simulation approach has gained significant attention in optimizing the process parameters, supported by the development of computing technology.
INTERNATIONAL JOURNAL OF AUTOMOTIVE TECHNOLOGY
(2022)
Article
Chemistry, Physical
Yanju Wang, Pengfei Wu, Xiaolei He, Wei Zhao, Xiang Lan, Yanshan Lou
Summary: This study investigated the effects of temperature and strain rate on the mechanical behavior of SiC/Al 2009 composites and used an artificial neural network model to accurately model the strain hardening behavior. The results showed that the plastic deformation behavior of the composites was influenced by a coupling effect of strain, strain rate, and temperature.
Article
Chemistry, Physical
Minki Kim, Gihyun Bae, Namsu Park, Jung Han Song
Summary: This paper investigates the reduction of springback in an ultra-high-strength martensitic steel sheet through the use of an electrically single-pulsed current. Experimental results show that the springback can be reduced by increasing the current density, pulse duration, and electric energy density. The study also reveals that the athermal portion plays a significant role in the reduction of springback. The findings suggest that the single-pulsed current method can be effectively applied to forming processes, achieving a significant reduction in springback without severe changes in material properties.
Article
Materials Science, Multidisciplinary
Songchen Wang, Yue Wang, Long Yu, Kang Ji, Xiaochuan Liu, Yanshan Lou
Summary: In this study, the ductile fracture behavior of QP980 under complex stress states was investigated using experimental and numerical methods. The constitutive model parameters were optimized to improve the prediction accuracy.
Article
Engineering, Multidisciplinary
Baotong Li, Yuqi Duan, Hua Yang, Yanshan Lou, Wolfgang H. Muiller
Summary: In this paper, optimal topologies of isotropic linear elastic strain gradient materials are investigated using isogeometric topology optimization. Strain gradient theory is applied to capture the microstructural effects of materials and regulate stress/strain concentration phenomena.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2022)
Article
Engineering, Mechanical
Pengfei Wu, Yanshan Lou, Qiang Chen, Haiqing Ning
Summary: This research focuses on characterizing and modeling the effects of temperature and stress state on the yield and fracture behaviors of an Mg-Gd-Y alloy. Experimental results show that the strength of the alloy decreases non-uniformly with increasing temperature. The tension-compression asymmetry varies nonlinearly with temperature and strain, and the fracture behavior is influenced by both temperature and stress state. A modified Zerilli-Armstrong model is proposed to describe the plastic flow behavior, while the Cazacu-Barlat2004 yield function captures the non-uniform evolution characteristic. The established models are validated through numerical simulations.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Engineering, Mechanical
Yanshan Lou, Chong Zhang, Saijun Zhang, Jeong Whan Yoon
Summary: A stress invariant-based yield function is proposed in this research to precisely model the differential strain hardening behavior under different stress states. The convex domain of the proposed function is computed using a numerical convex analysis method, and the parameters of the function are analytically computed based on experimental data. The function is successfully applied to simulate the plastic behavior of different metal materials and accurately predict experimental responses.
INTERNATIONAL JOURNAL OF PLASTICITY
(2022)
Article
Materials Science, Multidisciplinary
Chong Zhang, Saijun Zhang, Yanshan Lou
Summary: This study characterizes the plastic behavior under cyclic loading for an aluminum alloy of 5182-O and advanced high strength steel of QP1180. The results show that the calibration accuracy under the non-associated flow rule (NAFR) is higher than the associated flow rule (AFR) especially for large strain conditions. The additional shear constraint imposed on the plastic potential of NAFR is found to be an effective approach to enforce the simulated shear stress at zero hydrostatic pressure. The HAH model has more flexibility compared to the kinematic hardening model benefiting from its distortional hardening form.
MECHANICS OF MATERIALS
(2022)
Article
Mechanics
Yanshan Lou, Pengfei Wu, Chong Zhang, Jizhen Wang, Xvyang Li, Rugang Chai, Jeong Whan Yoon
Summary: A stress-based shear ductile fracture criterion (sDF2016) is introduced to improve the prediction accuracy of failure for lightweight metals. The criterion takes into account the stress state effect on fracture and is less sensitive to strain path changing effect. Experimental verification and modeling results show that the sDF2016 criterion can accurately predict fracture initiation under distinct stress states.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2022)
Article
Engineering, Manufacturing
Hongchun Shang, Chong Zhang, Songchen Wang, Yanshan Lou
Summary: This research characterizes the effect of strain rate and temperature on flow behaviors under large plastic deformation for 5182-O aluminum alloy by conducting experiments and numerical simulations. An artificial neural network model is established to consider the highly coupled dynamic hardening behavior.
INTERNATIONAL JOURNAL OF MATERIAL FORMING
(2023)
Article
Chemistry, Physical
Jizhen Wang, Miao Han, Chong Zhang, Hasib Md Abu Rayhan, Xvyang Li, Yanshan Lou
Summary: By combining experimental and theoretical models, this research investigates the anisotropic hardening behaviors of TRIP780 steel. The experimental results show that TRIP780 steel exhibits anisotropic characteristics in terms of strength and plastic deformation. Comparing different models, the Chen-CQN function demonstrates better numerical implementation and more realistic prediction of yield stress for the TRIP780 steel sheet.
Editorial Material
Mechanics
Namsu Park, Sungho Kim, Minki Kim
Summary: In this study, finite element analysis based on the arbitrary Lagrangian-Eulerian technique was used to investigate the complex deformation behavior and numerous process variables during the self-piercing riveting joining of multi-materials. Tensile testing and inverse analysis were conducted to determine the mechanical responses of each joining material, and fracture modeling approaches were adopted for crack initiation prediction. The damage distribution and joining characteristics during the SPR joining were numerically investigated, and the FE modeling approach was validated through comparisons with experiments.
COMPOSITE STRUCTURES
(2023)
Article
Engineering, Mechanical
Yanshan Lou, Jeong Whan Yoon
Summary: It is proposed to extend anisotropic yield functions into asymmetric ones by introducing a Lode-dependent function. The proposed Lode-dependent anisotropic-asymmetric (LAA) function is applied to characterize the anisotropic hardening behaviors under both tension and compression. The application shows that the proposed LAA function precisely characterizes the anisotropy in tension and compression and its evolution with plastic deformation.
INTERNATIONAL JOURNAL OF PLASTICITY
(2023)
Article
Chemistry, Physical
Xiang Gao, Songchen Wang, Zhongming Xu, Jia Zhou, Xinming Wan, Hasib Md Abu Rayhan, Yanshan Lou
Summary: In this paper, the plastic anisotropic evolution of 304 stainless steel (SS304) is characterized using the CQN_Chen function. Uniaxial tensile tests are conducted along different loading directions to investigate the anisotropic hardening behavior of SS304. The experimental data shows that SS304 has weak anisotropy. The accuracy of the CQN_Chen function in characterizing plastic evolution is evaluated by comparing it with the Hill48, SY2009 and CQN functions. The comparison with experimental data demonstrates that the CQN_Chen function accurately characterizes anisotropic hardening behavior under uniaxial and equibiaxial tension, and has the ability to adjust the yield surface shape between these two conditions.
Article
Engineering, Civil
Hyung-Rim Lee, Myoung-Gyu Lee, Namsu Park
Summary: This study investigates the use of an evolutionary anisotropic plasticity model for predicting sheet deformation in the incremental sheet forming (ISF) process. The proposed model shows high accuracy in predicting thickness and forming force, demonstrating the importance of evolutionary sheet anisotropy in the SPIF process.
THIN-WALLED STRUCTURES
(2023)