| Temperature distribution in adiabatic shear band for ductile metal based on JOHNSON-COOK and gradient plasticity models |
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| 作者姓名： | 王学滨 |
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| 作者单位： | Department of |
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| 基金项目： | Project(2004F052) supported by the Educational Department of Liaoning Province, China |
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| 摘 要： | 1 Introduction Adiabatic shear localization is one of the most important deformation and failure mechanisms in some titanium alloys subjected to moderate and high shear strain rates. Adiabatic shear band(ASB) can be observed in various applications, such as metal forming, perforation, impact on structures, ballistic impact, machining, torsion, explosive fragmentation, grinding, interfacial friction, powder compaction and granular flow1?15]. The formation of ASBs is often followed by ductile…
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| 关 键 词： | Ti-6Al-4V 钛合金 绝热带 塑性 JOHNSON-COOK模型 动态再结晶 相变 |
| 收稿时间： | 2005-06-21 |
| 修稿时间： | 2005-11-11 |
Temperature distribution in adiabatic shear band for ductile metal based on JOHNSON-COOK and gradient plasticity models |
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| WANG Xue-bin.Temperature distribution in adiabatic shear band for ductile metal based on JOHNSON-COOK and gradient plasticity models[J].Transactions of Nonferrous Metals Society of China,2006,16(2):333-338. |
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| Authors: | WANG Xue-bin |
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| Affiliation: | 1. Department of Engineering Mechanics, and Key Laboratory of Soft Machines and Smart Devices of Zhejiang Province, Zhejiang University, Hangzhou 310027, Zhejiang Province, China;2. School of Mechanical Engineering, Tianjin University, Tianjin 300072, China;3. Tianjin Key Laboratory of Nonlinear Dynamics and Control, Tianjin 300072, China;4. Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hong Kong, China;1. Institute of Machine Tools and Manufacturing, ETH Zurich, Leonhardstrasse 21, 8092 Zurich, Switzerland;2. ABB Switzerland Ltd., Semiconductors, BiMOS, PTS3-2, Fabrikstrasse 3, 5600 Lenzburg, Aargau, Switzerland;3. Empa-Swiss Federal Laboratories for Materials Science and Technology, Ueberlandstrasse 129, 8600 Duebendorf, Switzerland;1. Henan University of Science and Technology, China;2. City, University of London, United Kingdom;3. Tianjin University, China |
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| Abstract: | Gradient-dependent plasticity considering interactions and interplay among microstructures was included into JOHNSON-COOK model to calculate the temperature distribution in adiabatic shear band(ASB), the peak and average temperatures as well as their evolutions. The differential local plastic shear strain was derived to calculate the differential local plastic work and the temperature rise due to the microstructural effect. The total temperature in ASB is the sum of initial temperature, temperature rise at strain-hardening stage and non-uniform temperature due to the microstructural effect beyond the peak shear stress. The flow shear stress—average plastic shear strain curve, the temperature distribution, the peak and average temperatures in ASB are computed for Ti-6Al-4V. When the imposed shear strain is less than 2 and the shear strain rate is 1 000 s?1, the dynamic recovery and recrystallization processes occur. However, without the microstructural effect, the processes might have not occurred since heat diffusion decreases the temperature in ASB. The calculated maximum temperature approaches 1 500 K so that phase transformation might take place. The present predictions support the previously experimental results showing that the transformed and deformed ASBs are observed in Ti-6Al-4V. Higher shear strain rate enhances the possibility of dynamic recrystallization and phase transformation. |
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| Keywords: | Ti-6Al-4V adiabatic shear band gradient-dependent plasticity JOHNSON-COOK model dynamic recrystallization phase transformation |
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