EFFECT OF SURFACE ROUGHNESS ON THE FORMATION OF SHEAR BAND IN Ti-6Al-4V ALLOY CYLINDRICAL SHELL
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摘要: 剪切带是材料在高应变率加载条件下特有的变形和损伤形式之一,关于影响金属材料中剪切带形成的敏感性因素及其机理的研究,一直是科学研究和工程设计中关注的重点问题. 在柱壳高速坍塌过程中,剪切带优先在内表面形核, 其形核及扩展行为受内表面介观状态的影响显著.本文采用爆轰加载厚壁圆筒坍塌实验技术,结合材料表面处理技术、微结构表征技术和剪切带理论模型分析,研究了内表面粗糙度变化对TC4钛合金柱壳剪切带形成影响的细观动力学规律.结果表明, 在爆炸加载形成的高应变率条件下,表面粗糙度对TC4钛合金柱壳中剪切带形成具有明显影响. 在相同的变形条件下,随着试样内表面粗糙度的增大, 剪切带数量、长度和形核速率均增大;表面粗糙度越大, 部分剪切带扩展速率越快, 剪切带长度差异越大,剪切带的屏蔽效应增强. 分析表明,实验获得的剪切带间距与W-O模型和M模型预测结果基本吻合,具体数值受试样内表面粗糙度影响, 随着表面粗糙度的增大,实验结果逐渐小于预测数值.Abstract: Shear band is one of the special deformations and damage forms of materials under high strain rate loading. The research on the sensitive factors and mechanism of shear band formation in metal materials has always been one of the key issues in scientific research and engineering design. In the process of high-speed collapse of cylindrical shell, the shear band nucleates preferentially in the inner surface, and its nucleation and propagation behavior are significantly affected by the mesoscopic state of the inner surface. In the presented study, the detonation loading of Ti-6AL-4V alloy cylindrical shell was carried out by thick walled cylinder collapse experiment. Combined with surface treatment technology, microstructure characterization technology and shear banding analysis model, the effect of inner surface roughness on the law of mesodynamics of shear band formation in Ti-6AL-4V alloy cylindrical shell was studied through the shear band pattern in samples. The experimental results show that the inner surface roughness has a significant effect on the formation of adiabatic shear bands in Ti-6AL-4V alloy cylindrical shells under high strain rate. The number, length and nucleation rate of adiabatic shear bands in the specimen increase with the increase of the inner surface roughness under the same deformation condition. The results indicate that, the larger surface roughness leads to a stronger shielding effect for the shear bands. Furthermore, the propagating velocity and length of partial adiabatic shear bands in the specimen increase with the increase of the inner surface roughness. The experimental results of shear band spacing are in good agreement with the prediction of W-O model and M model, but the spacing values are influenced by the inner surface roughness of the specimen. With the increase of the inner surface roughness, the experimental results are gradually smaller than the prediction of models.
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Keywords:
- thick-walled cylinder /
- Ti-6AL-4V alloy /
- surface roughness /
- shear band
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