Article
Materials Science, Multidisciplinary
Thein Lin Aung, Ninshu Ma, Yoshitaka Okitsu, Seiji Hayashi, Kenji Takada, Tadashi Naito
Summary: In this study, the work hardening characteristics of a high strength steel sheet were investigated after undergoing plastic strain in rolling and transverse directions. It was found that a material with mild initial anisotropy showed strong anisotropic work hardening effect after strain path change. A mathematical model was proposed to reproduce the observed hardening phenomena, which can be easily implemented into existing FEM software. The model was validated through comparing simulation results with experimental measurements.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
J. Min, J. Kong, Y. Hou, Z. Liu, J. Lin
Summary: This study utilizes laser deposition technology to characterize the hardening behavior and fracture limits of advanced high strength steels undergoing strain path changes. The results show that both hardening behavior and fracture limits are affected by the loading history. Laser deposition technique can be employed for material characterization under specific strain path changes.
EXPERIMENTAL MECHANICS
(2022)
Article
Materials Science, Multidisciplinary
Isiaka Aderibigbe, Patricia Popoola, Emmanuel Sadiku, Elliot Biro
Summary: This paper analysed the change in microstructure and the low-temperature deformation and strain hardening behavior of laser welded DP800 and DP1000. The results showed that the fusion zone was fully martensitic and the heat-affected zone had a significant impact on the joint efficiency. The welded joints exhibited slightly increased strength and work hardening exponents compared to the base metals. Fractures occurred in the base metal and heat-affected zone of the welded joints, showing characteristic dimple fractures.
Article
Materials Science, Multidisciplinary
F. M. F. Serafim, I. N. A. Oguocha, A. G. Odeshi, R. Evitts, R. J. Gerspacher, E. G. Ohaeri, A. A. Tiamiyu, W. O. Alabi
Summary: The deformation behavior of selected stainless steels was evaluated at different strain rates, showing relatively constant total strain at fracture within a certain range of strain rates. However, a decrease in strain rate above a certain threshold resulted in lower strain. Each steel exhibited varying levels of strain rate sensitivity, with strain hardening rate and exponent increasing as strain rate decreased. Post-deformation microstructure evaluations showed different behaviors for different steels, with dimple diameter increasing and dimple density decreasing with higher strain rates.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2021)
Article
Engineering, Civil
Paulina Lisiecka-Graca, Krzysztof Bzowski, Janusz Majta, Krzysztof Muszka
Summary: The mechanical behaviors of microalloyed and low-carbon steels under strain reversal were modeled based on the average dislocation density, taking into account its allocation between cell walls and interiors. The back stress was assumed as an internal variable. The proposed methods of calculating the initial dislocation density were compared and the effectiveness of the computational methodology was demonstrated through microstructural analysis and comparison with experimental results.
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING
(2021)
Article
Engineering, Mechanical
Diane Herault, Sandrine Thuillier, Shin-Yeong Lee, Pierre-Yves Manach, Frederic Barlat
Summary: This study aims to investigate the mechanical behavior and formability of dual phase steels under complex loading paths, as well as to calibrate a strain path change model. The use of the enhanced Homogeneous Anisotropic Hardening (e-HAH) model in experiments considers the influence of strain path changes on material behavior.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2021)
Article
Materials Science, Multidisciplinary
Xuehui Yan, Peter K. Liaw, Yong Zhang
Summary: Extraordinary strength and good tensile ductility are achieved in (Zr0.5Ti0.35Nb0.15)(100-x)Al-x alloys at room temperature. The relatively low densities exhibited in these alloys make them attractive structural materials. Designing nanoprecipitates and diversifying dislocation motions play key roles in achieving such breakthrough.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Sirous Rizehvandy
Summary: The study developed a multistage strain aging method to investigate the behavior of low carbon steel under static strain aging, revealing that multistage aging can increase strength but decrease plasticity. Different types of pre-strain and aging temperatures also have significant effects on the mechanical properties of the samples.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Materials Science, Multidisciplinary
Mingxiang Liu, Changjiang Song, Zhenshan Cui
Summary: The strain-induced martensite transformation plays a crucial role in the strain hardening process of low-density steel. This transformation is affected by the texture evolution and grain size of austenite, influencing the rate of martensite transformation in each stage of strain hardening. The presence of TWIP effect and high density dislocations during martensite transformation contributes to continuous hardening, but the final stage is slowed down by unfavorable orientation and reduced grain size of austenite.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Mechanics
Jinwoo Lee, Hyuk Jong Bong, Jinjin Ha
Summary: This study developed a fast and robust stress-update algorithm based on the general cutting-plane method for a distortional hardening model, and rectified the lower computational efficiency issue by considering the evolutionary plastic state variables. The algorithm was formulated on the dependence of the equivalent plastic strain and other state variables defined in the distortional hardening model, and implemented in a commercial finite element software using a user-defined material subroutine.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2022)
Article
Metallurgy & Metallurgical Engineering
Kenta Sakaguchi, Shigeto Yamasaki, Hiroyuki Kawata, Kohtaro Hayashi, Manabu Takahashi
Summary: The study analyzed the stress-strain curve characteristics of quenched martensitic steels, finding that the continuum composite approach model can describe the stress-strain curves effectively. The relationship between macroscopic deformation behaviors and microstructural information was investigated, and the unit size corresponding to the microstructure was determined through high-spatial-resolution digital image correlation analysis.
ISIJ INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Ramadan N. Elshaer, Mohamed K. El-Fawakhry, Ahmed I. Z. Farahat
Summary: The effects of quenching after martensitic finish (QAM(f)) and quenching & partitioning (Q&P) on microstructure evolution and mechanical properties of low and medium carbon hot rolled steels were investigated. While QAM(f) process increased uniform elongation and ultimate tensile strength (UTS) in low carbon steel, Q&P process reduced uniform elongation but significantly increased UTS in medium carbon steel. Both processes showed changes in strain hardening instability zones compared to the hot-rolled process, with Q&P process greatly decreasing the instability zone in medium carbon steel.
METALS AND MATERIALS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
A. Sendrowicz, A. O. Myhre, I. S. Yasnikov, A. Vinogradov
Summary: This study revisits the classical topic of elastic energy storage during strain hardening of metals from the perspective of an analytically tractable thermodynamic modelling framework. The model's versatility has been extended to predict energy partitioning during plastic flow. The obtained analytical solutions demonstrate good predictive capability and can be applied to other metals.
Article
Nanoscience & Nanotechnology
Xiaoqian Guo, Chao Ma, Lingyu Zhao, Adrien Chapuis, Qing Liu, Peidong Wu
Summary: Wrought magnesium and Mg alloys exhibit strong basal texture and various slip and twin modes at room temperature, which interact with each other and are modeled empirically via latent hardening coupling coefficients. The activation of {1012} tension twinning can lead to severe mechanical anisotropy and texture change, influenced by slip-induced dislocations. Experiments and simulations show that latent hardening by slip modes for {1012} twinning is much less than self-hardening.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Nanoscience & Nanotechnology
Deping Zhang, Dongdong Zhang, Yaqin Zhang, Shanrong Chen, Tao Xu, Jian Meng
Summary: The ductile Mg-Yb based alloy shows better strain hardening ability and formability at room temperature compared to high-formable Mg alloys. The alloy exhibits four strain hardening stages labeled as stage I, II, III, and IV, different from the majority of Mg alloys, with stage II characterized by an increased strain hardening rate rather than plateau or decrease.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Engineering, Industrial
Marilena C. Butuc, Frederic Barlat, Gabriela Vincze
Summary: This study aims to predict and analyze the formability of TWIP steels using the MK theory, focusing on the influence of mechanical properties on the prediction results. The research found that the current MK theory is not suitable for accurately predicting the forming limits of TWIP steels, necessitating the development of new failure models.
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
C. Rochet, M. Veron, E. F. Rauch, T. C. Lowe, B. Arfaei, A. Laurino, J. P. Harouard, C. Blanc
Article
Engineering, Mechanical
M. S. Wi, S. Y. Lee, J. H. Kim, J. M. Kim, F. Barlat
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2020)
Article
Materials Science, Multidisciplinary
Zhangxi Feng, Seong-Yong Yoon, Jae-Hyun Choi, Timothy J. Barrett, Milovan Zecevic, Frederic Barlat, Marko Knezevic
MECHANICS OF MATERIALS
(2020)
Article
Metallurgy & Metallurgical Engineering
Jae-wook Lee, Frederic Barlat
Summary: Experimental and analytical studies were conducted on the stretch-bending characteristics of advanced high-strength steel sheets commonly used in the automotive industry. A relationship between applied force and forming height was derived based on the assumption that material failure occurred at the maximum tensile force. Nine different types of steels were tested, and a failure criterion based on process variables and material tensile properties was proposed.
STEEL RESEARCH INTERNATIONAL
(2021)
Article
Engineering, Mechanical
Vivek K. Barnwal, Shin-Yeong Lee, Jisik Choi, Jin-Hwan Kim, Frederic Barlat
Summary: This study investigated the fracture behavior of two important AHSS sheets under an equal-biaxial state of stress using hydraulic bulge test and digital image correlation technique. The results showed shear localization during fracture and revealed likely sources of micro-crack initiation. In addition to fracture characterization, a comprehensive finite element study was conducted, and a simple fracture criterion was applied to predict the onset of fracture for both steels.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2021)
Article
Engineering, Mechanical
Diane Herault, Sandrine Thuillier, Shin-Yeong Lee, Pierre-Yves Manach, Frederic Barlat
Summary: This study aims to investigate the mechanical behavior and formability of dual phase steels under complex loading paths, as well as to calibrate a strain path change model. The use of the enhanced Homogeneous Anisotropic Hardening (e-HAH) model in experiments considers the influence of strain path changes on material behavior.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2021)
Review
Engineering, Mechanical
Vivek K. Barnwal, Shin-Yeong Lee, Jisik Choi, Jin-Hwan Kim, Frederic Barlat
Summary: The numerical description of ductile fracture for advanced high strength steel sheets remains a challenge in sheet metal research, with no consensus on a suitable fracture criterion. A study evaluating six fracture criteria on TRIP1180 sheet under different loading conditions found that traditional uncoupled fracture criteria can reasonably describe the fracture. The study also showed that a high number of fracture coefficients does not guarantee improved fracture prediction under various loading conditions.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2021)
Article
Materials Science, Multidisciplinary
Jin-Seong Park, Ji-Min Kim, Frederic Barlat, Ji-Ho Lim, Fabrice Pierron, Jin-Hwan Kim
Summary: The research aims to determine stress-strain curves of sheet metals at various strain rates from a single dynamic experiment. A new high-speed tensile tester was built, and full-field heterogeneous strain fields were measured using digital image correlation technique. Stress-strain curves of three advanced high strength steels at intermediate strain rates were successfully obtained from a single experiment through an inverse identification scheme with a rate dependent hardening law.
MECHANICS OF MATERIALS
(2021)
Article
Engineering, Manufacturing
Toshihiko Kuwabara, Ren Tachibana, Yusuke Takada, Takayuki Koizumi, Sam Coppieters, Frederic Barlat
Summary: This study experimentally investigates the effect of hydrostatic stress on the strength differential effect (SDE) in a low-carbon steel sheet. The results show a positive correlation between hydrostatic pressure and flow stress, leading to the occurrence of SDE.
INTERNATIONAL JOURNAL OF MATERIAL FORMING
(2022)
Article
Mechanics
Marco Rossi, Attilio Lattanzi, Frederic Barlat, Jin-Hwan Kim
Summary: The hydraulic bulge test (HBT) is an important experimental technique to identify the properties of materials, particularly metals. This paper proposes a new approach using stereo-DIC to obtain the displacement field and apply it in an inverse identification scheme for evaluating the properties of metals.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2022)
Article
Engineering, Industrial
Seong-Yong Yoon, Frederic Barlat, Shin-Yeong Lee, Jin-Hwan Kim, Min-Su Wi, Dong-Jin Kim
Summary: In this study, the hydrostatic pressure-dependency of the distortional plasticity model HAH(20) was implemented using a finite element code to account for the strength-differential effect observed in high-strength steel sheets. The implementation was validated by comparing the results with a stand-alone code and experimental data, and the influence of the strength-differential effect on springback simulation was analyzed.
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
(2022)
Article
Engineering, Mechanical
Mooyeong Joo, Min-Su Wi, Seong-Yong Yoon, Shin-Yeong Lee, Frederic Barlat, Carlos N. Tome, Bohye Jeon, Youngung Jeong
Summary: An incremental elasto-visco-plastic self-consistent polycrystal model was directly interfaced with a finite element code to simulate the 3-point-bending process of a mild steel sample. This study predicts the springback response after various amounts of prestrains for the first time. The crystallographic orientation distribution obtained from an EBSD scan was used to assign the initial polycrystalline aggregate for each finite element integration point. The model successfully predicts the effect of prestrain on springback and can be directly applied to industrial forming and springback predictions.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Engineering, Mechanical
Seongyong Yoon, Frederic Barlat
Summary: A non-iterative stress update method is proposed to accelerate finite element simulations in plasticity. This method directly integrates the stress tensor based on elastoplastic constitutive law without needing a recursive root-finding process. The method ensures the positivity of the effective plastic strain increment and resolves the uncertainty of yield condition fulfillment through a stress projection technique. It significantly reduces computation time by approximately 50% while maintaining high accuracy in a variety of finite element simulation examples.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Engineering, Mechanical
Shin-Yeong Lee, Seong-Yong Yoon, Jin-Hwan Kim, Kyung-Seok Oh
Summary: This study assesses the performance of conventional and advanced constitutive models in predicting springback for ultra-high strength steel. The elasto-plastic behavior of a martensitic steel sheet sample is characterized to evaluate the conventional stress-strain behavior. Various tests, including uniaxial compression and tension-compression experiments, are conducted to assess the strength-differential effect and hardening fluctuations during non-linear loading paths. Three constitutive plasticity models are calibrated and employed for finite element predictions of springback. The HAH20 model, which considers both SD and NLLP effects, performs the best in predicting forming and springback for martensitic steel.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
