摘要
研究了在爆炸复合冲击载荷下工业纯钛和低碳钢(TA2/A3)爆炸复合界面层附近TA2侧出现的绝热剪切带(ASB)内的显微组织,表明其ASB内具有等轴微晶组织特征并未发现微裂纹,ASB内的显微硬度比附近基体略高,对仅在TA2侧产生ASB,而在A3侧从未观察到.这一现象从材料-力学-热学上进行了综合分析讨论.结果表明:应变丰和应变都影响绝热剪切过程;在爆炸复合冲击载荷这一近似绝热条件下,材料本身的物理性能(如比定容热容cv,密度p等)、刀学性能(如导热系数k)都影响ASB产生的倾向性.
The microstructure of adiabatic shear band(ASB)for pure titanium developed under ex-plosion-clad shock loading was observed by means of OM and SEM. Very fine equiaxed mi-crocrystal structure without cavities was observed in ASB_s.Microhardness differences be-tween the bands and adjacent regions were slight.The reasons why ASB: only occurs on theTA2 side but not on the A3 side were respectively discussed in light of the materials'physi-cal,mechanical and thermal properties.
关键词
复合板
工业纯钛
低碳钢
爆炸成型
dynamic instability;shear;adiabatic shearing;shock loading;thermo-viscoplas-ticity