| 谷丽瑶,王敏杰.高速切削过程中诱发绝热剪切带形成的热塑性剪切波[J].计算力学学报,2013,30(2):269~274 |
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| 高速切削过程中诱发绝热剪切带形成的热塑性剪切波 |
| Thermo-plastic shear wave induced adiabatic shear banding in high speed machining |
| 投稿时间：2012-03-30 修订日期：2012-06-23 |
| DOI：10.7511/jslx201302016 |
| 中文关键词: 高速切削 绝热剪切 热塑性剪切波 锯齿形切屑 剪切带宽度 |
| 英文关键词:high speed machining adiabatic shear instability thermo-plastic shear wave serrated chip shear bandwidth |
| 基金项目:国家自然科学基金(51175063)资助项目. |
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| 全文下载次数: 2090 |
| 中文摘要: |
| 提出了高速切削过程中诱发绝热剪切带形成的热塑性剪切波的传播机理,针对锯齿形切屑中热塑性区域内的塑性梯度变形特征、动量和能量耗散情况,建立了与切削条件相关的热塑性剪切波的传播模型及剪切带宽度模型。在此基础上,通过淬硬45钢的切削实验并结合改进的Johnson-Cook本构模型分析了热塑性剪切波的传播规律,并将剪切带宽度模型与已提出的DB模型、WR模型和DM模型做了对比,结果表明,由热塑性剪切波传播理论推导的剪切带宽度模型与实验结果较其他模型吻合较好。 |
| 英文摘要: |
| The propagation mechanism of thermo-plastic shear wave induced adiabatic shear banding in high speed machining was presented theoretically.Considering plastic gradient deformation characteristics,momentum and energy dissipations in thermo-plastic region of serrated chip with adiabatic shear band,the propagation model of thermo-plastic shear wave and the corresponding shear bandwidth model were established.On this basis,through high speed cutting experiment of hardened 45 steel and its modified Johnson-Cook constitutive model,the propagation laws of thermo-plastic shear wave were investigated and the shear bandwidth model was compared with other purposed shear bandwidth models,such as DB model,WR model and DM model.The results indicate that the shear bandwidth model deduced from the propagation theory of thermo-plastic shear wave is more accordant with the experimental results than the other shear bandwidth models. |
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