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Ling C, Ren X, Wang X, Li Y, Liu Z, Wang B, Zhao J. Dynamic Mechanical Properties and Modified Johnson-Cook Model Considering Recrystallization Softening for Nickel-Based Powder Metallurgy Superalloys. MATERIALS (BASEL, SWITZERLAND) 2024; 17:670. [PMID: 38591537 PMCID: PMC10856738 DOI: 10.3390/ma17030670] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2023] [Revised: 01/22/2024] [Accepted: 01/25/2024] [Indexed: 04/10/2024]
Abstract
The material undergoes high temperature and high strain rate deformation process during the cutting process, which may induce the dynamic recrystallization behavior and result in the evolution of dynamic mechanical properties of the material to be machined. In this paper, the modified Johnson-Cook (J-C) model for nickel-based powder metallurgy superalloy considering dynamic recrystallization behavior in high strain rate and temperature is proposed. The dynamic mechanical properties of the material under different strain rates and temperature conditions are obtained by quasi-static compression test and split Hopkinson pressure bar (SHPB) test. The coefficients of the modified J-C model are obtained by the linear regression method. The modified model is verified by comparison with experimental and model prediction results. The results show that the modified J-C model proposed in this paper can accurately describe the mechanical properties of nickel-based powder metallurgy superalloys at high temperatures and high strain rates. This provides help for studying the cutting mechanism and finite element simulation of nickel-based powder metallurgy superalloy.
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Affiliation(s)
- Chen Ling
- School of Mechanical Engineering, Shandong University, Jinan 250061, China; (C.L.); (X.W.); (Y.L.); (Z.L.); (B.W.); (J.Z.)
- Key National Demonstration Center for Experimental Mechanical Engineering Education, Key Laboratory of High Efficiency and Clean Mechanical Manufacture of MQE, Jinan 250014, China
| | - Xiaoping Ren
- School of Mechanical Engineering, Shandong University, Jinan 250061, China; (C.L.); (X.W.); (Y.L.); (Z.L.); (B.W.); (J.Z.)
- Key National Demonstration Center for Experimental Mechanical Engineering Education, Key Laboratory of High Efficiency and Clean Mechanical Manufacture of MQE, Jinan 250014, China
| | - Xuepeng Wang
- School of Mechanical Engineering, Shandong University, Jinan 250061, China; (C.L.); (X.W.); (Y.L.); (Z.L.); (B.W.); (J.Z.)
- Key National Demonstration Center for Experimental Mechanical Engineering Education, Key Laboratory of High Efficiency and Clean Mechanical Manufacture of MQE, Jinan 250014, China
| | - Yinghao Li
- School of Mechanical Engineering, Shandong University, Jinan 250061, China; (C.L.); (X.W.); (Y.L.); (Z.L.); (B.W.); (J.Z.)
- Key National Demonstration Center for Experimental Mechanical Engineering Education, Key Laboratory of High Efficiency and Clean Mechanical Manufacture of MQE, Jinan 250014, China
| | - Zhanqiang Liu
- School of Mechanical Engineering, Shandong University, Jinan 250061, China; (C.L.); (X.W.); (Y.L.); (Z.L.); (B.W.); (J.Z.)
- Key National Demonstration Center for Experimental Mechanical Engineering Education, Key Laboratory of High Efficiency and Clean Mechanical Manufacture of MQE, Jinan 250014, China
| | - Bing Wang
- School of Mechanical Engineering, Shandong University, Jinan 250061, China; (C.L.); (X.W.); (Y.L.); (Z.L.); (B.W.); (J.Z.)
- Key National Demonstration Center for Experimental Mechanical Engineering Education, Key Laboratory of High Efficiency and Clean Mechanical Manufacture of MQE, Jinan 250014, China
| | - Jinfu Zhao
- School of Mechanical Engineering, Shandong University, Jinan 250061, China; (C.L.); (X.W.); (Y.L.); (Z.L.); (B.W.); (J.Z.)
- Key National Demonstration Center for Experimental Mechanical Engineering Education, Key Laboratory of High Efficiency and Clean Mechanical Manufacture of MQE, Jinan 250014, China
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Miao Y, Yin J, Du W, Chen L. Mechanical behavior of nanorubber reinforced epoxy over a wide strain rate loading. NANO MATERIALS SCIENCE 2023. [DOI: 10.1016/j.nanoms.2023.03.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/17/2023]
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Jiang M, Dai L. 非晶态固体力学. CHINESE SCIENCE BULLETIN-CHINESE 2022. [DOI: 10.1360/tb-2022-0181] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Hao F, Du Y, Li P, Mao Y, Lin D, Wang J, Gao X, Wang K, Liu X, Song H, Feng Y, Li J, Wang WY. Effect of High Strain Rate on Adiabatic Shearing of α+β Dual-Phase Ti Alloy. MATERIALS 2021; 14:ma14082044. [PMID: 33921667 PMCID: PMC8073931 DOI: 10.3390/ma14082044] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/01/2021] [Revised: 04/14/2021] [Accepted: 04/15/2021] [Indexed: 11/16/2022]
Abstract
In the present work, the localized features of adiabatic shear bands (ASBs) of our recently designed damage tolerance α+β dual-phase Ti alloy are investigated by the integration of electron backscattering diffraction and experimental and theoretical Schmid factor analysis. At the strain rate of 1.8 × 104 s-1 induced by a split Hopkinson pressure bar, the shear stress reaches a maximum of 1951 MPa with the shear strain of 1.27. It is found that the α+β dual-phase colony structures mediate the extensive plastic deformations along α/β phase boundaries, contributing to the formations of ASBs, microvoids, and cracks, and resulting in stable and unstable softening behaviors. Moreover, the dynamic recrystallization yields the dispersion of a great amount of fine α grains along the shearing paths and in the ASBs, promoting the softening and shear localization. On the contrary, low-angle grain boundaries present good resistance to the formation of cracks and the thermal softening, while the non-basal slipping dramatically contributes to the strain hardening, supporting the promising approaches to fabricate the advanced damage tolerance dual-phase Ti alloy.
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Affiliation(s)
- Fang Hao
- State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China; (F.H.); (P.L.); (Y.M.); (J.W.); (Y.F.); (J.L.)
- Western Superconducting Technologies Co., Ltd., Xi’an 710018, China; (K.W.); (X.L.)
| | - Yuxuan Du
- Western Superconducting Technologies Co., Ltd., Xi’an 710018, China; (K.W.); (X.L.)
- Correspondence: (Y.D.); (W.Y.W.)
| | - Peixuan Li
- State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China; (F.H.); (P.L.); (Y.M.); (J.W.); (Y.F.); (J.L.)
| | - Youchuan Mao
- State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China; (F.H.); (P.L.); (Y.M.); (J.W.); (Y.F.); (J.L.)
- Western Superconducting Technologies Co., Ltd., Xi’an 710018, China; (K.W.); (X.L.)
| | - Deye Lin
- CAEP Software Center for High Performance Numerical Simulation, Institute of Applied Physics and Computational Mathematics, Beijing 100088, China;
| | - Jun Wang
- State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China; (F.H.); (P.L.); (Y.M.); (J.W.); (Y.F.); (J.L.)
| | - Xingyu Gao
- Laboratory of Computational Physics, Institute of Applied Physics and Computational Mathematics, Beijing 100088, China; (X.G.); (H.S.)
| | - Kaixuan Wang
- Western Superconducting Technologies Co., Ltd., Xi’an 710018, China; (K.W.); (X.L.)
| | - Xianghong Liu
- Western Superconducting Technologies Co., Ltd., Xi’an 710018, China; (K.W.); (X.L.)
| | - Haifeng Song
- Laboratory of Computational Physics, Institute of Applied Physics and Computational Mathematics, Beijing 100088, China; (X.G.); (H.S.)
| | - Yong Feng
- State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China; (F.H.); (P.L.); (Y.M.); (J.W.); (Y.F.); (J.L.)
- Western Superconducting Technologies Co., Ltd., Xi’an 710018, China; (K.W.); (X.L.)
| | - Jinshan Li
- State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China; (F.H.); (P.L.); (Y.M.); (J.W.); (Y.F.); (J.L.)
| | - William Yi Wang
- State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China; (F.H.); (P.L.); (Y.M.); (J.W.); (Y.F.); (J.L.)
- Correspondence: (Y.D.); (W.Y.W.)
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Micro-Mechanisms of Shear Deformation Localization of Ti6Al4V Alloy under Shear-Compressive Loading Conditions. MATERIALS 2020; 13:ma13245646. [PMID: 33321980 PMCID: PMC7764047 DOI: 10.3390/ma13245646] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/17/2020] [Revised: 12/07/2020] [Accepted: 12/08/2020] [Indexed: 11/17/2022]
Abstract
Titanium Ti6Al4V alloy is a superior material that has extremely high strength, hardness and good anti-corrosion resistance. Dynamic shear-compression experiments were carried out on the alloy to investigate the micro-mechanisms of adiabatic shear banding (ASB) formation. The split Hopkinson pressure bar (SHPB) setup were used for the tests at high strain rates. It was found that the shear deformation localization (SDL) was considerably affected by the complex loading conditions. The micro-mechanisms for the ASB formation relied on different shear compressive proportion of loadings (SCLPs). Scanning electron microscope (SEM) observations showed that the ASB width was related with the SCLP and the fracture failure of alloy was induced by the nucleation and growth of microvoids. In transmission electron microscope (TEM) analysis, the microstructural changes of material within the ASB were characterized by dynamic recrystallization (DRX) and twining grain formation, dislocation migration, and stacking and grain refining processes. The results in this article demonstrates a complex image of microstructural evolution of alloy in the shear localization process.
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Ramanan N, Natarajan S. Causal Learning From Predictive Modeling for Observational Data. Front Big Data 2020; 3:535976. [PMID: 33693412 PMCID: PMC7931928 DOI: 10.3389/fdata.2020.535976] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2020] [Accepted: 08/27/2020] [Indexed: 11/17/2022] Open
Abstract
We consider the problem of learning structured causal models from observational data. In this work, we use causal Bayesian networks to represent causal relationships among model variables. To this effect, we explore the use of two types of independencies-context-specific independence (CSI) and mutual independence (MI). We use CSI to identify the candidate set of causal relationships and then use MI to quantify their strengths and construct a causal model. We validate the learned models on benchmark networks and demonstrate the effectiveness when compared to some of the state-of-the-art Causal Bayesian Network Learning algorithms from observational Data.
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Affiliation(s)
- Nandini Ramanan
- Computer Science Department, University of Texas at Dallas, Dallas, TX, United States
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Guo Y, Du B, Liu H, Ding Z, Zhao Z, Tang Z, Suo T, Li Y. Electromagnetic Hopkinson bar: A powerful scientific instrument to study mechanical behavior of materials at high strain rates. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2020; 91:081501. [PMID: 32872966 DOI: 10.1063/5.0006084] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/27/2020] [Accepted: 08/08/2020] [Indexed: 06/11/2023]
Abstract
The split Hopkinson bar (SHB) has been widely used for testing the dynamic mechanical behavior of materials. However, it is hard to involve complex stress conditions in traditional SHB due to its intrinsic characteristics. The Electromagnetic Hopkinson bar (E-Hopkinson bar) has been recently proposed as a solution. Different from the traditional SHB, the stress pulse of the E-Hopkinson bar is generated directly by the electromagnetic force. Therefore, the stress pulse that loads the specimen can be accurately controlled. With this advantage, some experiments that cannot be done with traditional SHB can be conducted by the E-Hopkinson bar technique. In this review, we introduced briefly the basic principles of the E-Hopkinson bar. Some lasted tests, such as symmetrically dynamic compression/tension of materials, interlaminar fracture of composites, dynamic Bauschinger effect of metals, intermediate strain rate tests, and dynamic multi-axial tests were also introduced. This new technique will be helpful for those researchers in the field of solid mechanics, especially when the strain rate and complex stress condition are involved.
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Affiliation(s)
- Yazhou Guo
- School of Aeronautics, Northwestern Polytechnical University, Xi'an 710072, China
| | - Bing Du
- School of Aeronautics, Northwestern Polytechnical University, Xi'an 710072, China
| | - Huifang Liu
- School of Aeronautics, Northwestern Polytechnical University, Xi'an 710072, China
| | - Zhupan Ding
- School of Aeronautics, Northwestern Polytechnical University, Xi'an 710072, China
| | - Zhenqiang Zhao
- School of Aeronautics, Northwestern Polytechnical University, Xi'an 710072, China
| | - Zhongbin Tang
- School of Aeronautics, Northwestern Polytechnical University, Xi'an 710072, China
| | - Tao Suo
- School of Aeronautics, Northwestern Polytechnical University, Xi'an 710072, China
| | - Yulong Li
- School of Aeronautics, Northwestern Polytechnical University, Xi'an 710072, China
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Nieto-Fuentes JC, Osovski S, Venkert A, Rittel D. Reassessment of the Dynamic Thermomechanical Conversion in Metals. PHYSICAL REVIEW LETTERS 2019; 123:255502. [PMID: 31922796 DOI: 10.1103/physrevlett.123.255502] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2019] [Indexed: 06/10/2023]
Abstract
Heat dissipation still remains an unsolved problem in dynamic plasticity, where nearly adiabatic conditions prevail during high-rate loading scenarios. It is well known that the mechanical energy that is not dissipated as heat during material straining remains stored in the lattice as microstructural defects, and thus, a one-to-one relationship can be expected between the stored energy, the materials microstructure, and its mechanical characteristics. This work demonstrates that this is not so straightforward. High-rate experiments on a Kolsky bar, combined with in situ thermal measurements, were performed on two well-studied materials: pure nickel and aluminum. A dislocation-based constitutive model was used to estimate the mechanical and thermomechanical material behavior. For both materials, the thermal response was observed to be strongly strain rate sensitive, while the mechanical flow, and microstructural characteristics (as characterized by transmission electron microscopy at similar strains), were not. This apparent discrepancy between mechanical and microstructural vs thermal results is discussed, and the concept of thermomechanical conversion is reassessed.
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Affiliation(s)
| | - S Osovski
- Faculty of Mechanical Engineering, Technion, 320000 Haifa, Israel
| | - A Venkert
- Chemistry Department, NRCN, 84190 Beer Sheva, Israel
| | - D Rittel
- Faculty of Mechanical Engineering, Technion, 320000 Haifa, Israel
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Jiang H, Xu S, Shan J, Wang D, Liu Y, Zhou L, Wang P. Dynamic breakage of porous hexagonal boron nitride ceramics subjected to impact loading. POWDER TECHNOL 2019. [DOI: 10.1016/j.powtec.2019.05.028] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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