论文部分内容阅读
利用分离式Ｈｏｐｋｉｎｓｏｎ压杆冲击加载装置，采用圆柱和锥台两种试样，在高应变速率加载条件下研究Ｔｉ－１７合金的应力应变响应和动态损伤特征实验结果表明，动态屈服应力和断裂应力比静态相应值高宏观损伤对应变速率敏感，而对应力不敏感，出现宏观损伤的临界应变速率．试样微观解剖显示绝热剪切带是材料宏观损伤的先兆，试样主要沿剪切带发生破坏、在垂直加载轴的横截面上，绝热剪切带呈圆弧形，平行加载轴剖面上绝热剪切带沿最大剪切应力方向．锥台试样中绝热剪切带的应变从始点到终点逐渐减小
The experimental results of stress-strain and dynamic damage of Ti-17 alloy under the condition of high strain rate loading were obtained by using the separate Hopkinson pressure bar impact loading device. The experimental results show that the dynamic yield stress and fracture stress The macroscopic damage is more sensitive than the static corresponding value to the strain rate, but it is not sensitive to the stress, and the critical strain rate of macro damage appears. The microscopic anatomy of the specimen shows that the adiabatic shear zone is a precursor to macroscopic damage of the material. The specimen mainly breaks along the shear zone. On the cross section of the vertical loading shaft, the adiabatic shear zone is arc-shaped and the thermal stress Shear band along the direction of the maximum shear stress. The strain of the adiabatic shear band in the frustum sample gradually decreases from the beginning to the end