高锰钢帽型样品在高速冲击下的剪切行为
发布时间：2018-12-20 14:48
【摘要】：绝热剪切带是材料在高速变形时一种典型的破坏形式,为了更好地理解高速冲击过程中绝热剪切带的形成和扩展,基于Johnson-Cook本构模型,利用ANSYS/LS-DYNA软件对高锰钢帽型样品高速冲击过程的剪切行为进行了二维数值模拟。结果表明:横穿剪切带方向,应力应变分布都是剪切带中心最高,然后向两边逐渐降低,类似于高斯分布;平行于剪切带方向,应力应变分布则是呈两端高中间低的特点。然后利用模拟的应力应变场分布确定了剪切带和裂纹形成及扩展方向,即从剪切区两端形成并向中间扩展;最后通过编辑软件的k文件直接得到了剪切带内部及周围形变影响区和基体的温度分布,其和应力应变场分布规律一致,结果与实验结果基本吻合。
[Abstract]:Adiabatic shear band is a typical failure form of material during high velocity deformation. In order to better understand the formation and expansion of adiabatic shear band during high velocity impact, the Johnson-Cook constitutive model is used. The shear behavior of high manganese steel cap during high speed impact was simulated by ANSYS/LS-DYNA software. The results show that the distribution of stress and strain is the highest in the direction of shear band, and then decreases gradually to both sides, which is similar to Gao Si's distribution, and parallel to the direction of shear band, the distribution of stress and strain is high at both ends and low in middle. Then the shear band and crack formation and propagation direction are determined by using the simulated stress-strain field distribution, that is to say, the shear zone is formed from both ends of the shear zone and propagates to the middle. Finally, the temperature distribution of the deformation affected zone and matrix in and around the shear band is directly obtained by editing the k file of the software, which is consistent with the stress-strain field distribution, and the results are in good agreement with the experimental results.
【作者单位】： 北京科技大学材料科学与工程学院;
【基金】：国家自然科学基金项目(51271028)
【分类号】：O344.1
本文编号：2388149
[Abstract]:Adiabatic shear band is a typical failure form of material during high velocity deformation. In order to better understand the formation and expansion of adiabatic shear band during high velocity impact, the Johnson-Cook constitutive model is used. The shear behavior of high manganese steel cap during high speed impact was simulated by ANSYS/LS-DYNA software. The results show that the distribution of stress and strain is the highest in the direction of shear band, and then decreases gradually to both sides, which is similar to Gao Si's distribution, and parallel to the direction of shear band, the distribution of stress and strain is high at both ends and low in middle. Then the shear band and crack formation and propagation direction are determined by using the simulated stress-strain field distribution, that is to say, the shear zone is formed from both ends of the shear zone and propagates to the middle. Finally, the temperature distribution of the deformation affected zone and matrix in and around the shear band is directly obtained by editing the k file of the software, which is consistent with the stress-strain field distribution, and the results are in good agreement with the experimental results.
【作者单位】： 北京科技大学材料科学与工程学院;
【基金】：国家自然科学基金项目(51271028)
【分类号】：O344.1
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