Adiabatic shear bands in α-titanium tube under external explosive loading
Adiabatic shear bands in α-titanium tube under external explosive loading
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DOI：
10.1007/s10853-007-1725-4
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发表时间：
2007-06
影响因子：
4.5
通讯作者：
B. F. Wang;Y. Yang;Z. Chen;Y. Zeng
中科院分区：
文献类型：
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作者：
B. F. Wang;Y. Yang;Z. Chen;Y. Zeng
利用径向压力爆炸实验成功地研究了α-Ti圆管在爆炸载荷作用下绝热剪切带的形成。剪切带起始于α-Ti管的内表面，沿截面呈沿着逆时针方向的螺旋状。剪切带的尖端沿着最大剪应力面传播。观察到四种类型的ASB，如分叉，收集，交叉和N形。剪切带是微孔形核、生长和聚合的首选场所。剪切带中的局部热点和应力集中是微孔形核的主要原因。微孔洞的聚合在ASB内部形成裂纹，当裂纹达到临界长度时，ASB发生灾难性断裂。
The radial pressure explosive experiment is successfully used to investigate the formation of adiabatic shear bands (ASBs) in α-titanium (α-Ti) tube under external explosive loading. The ASBs initiate at the inner surface of α-Ti tube, and most of the shear bands are in spiral form along the cross-section of the tube towards counterclockwise direction. Tip of a shear band propagates along the surface of the maximum shear stress. Four patterns of ASBs such as bifurcation, collection, crossing and N-shape are observed. The developed shear bands are the preferred sites for nucleation, growth and coalescence of microvoids. The nucleation of microvoid is caused by the local hot spots and stress concentration in the shear bands. The coalescence of microvoids forms the crack within ASBs, and when the critical crack length is reached catastrophic fracture occurs.