Investigation on Strain Hardening and Failure in Notched Tension Specimens of Cold Rolled Ti6Al4V Titanium Alloy

Materials

Hao Zhang¹  Jian Chen¹  Xunpeng Li¹  Tao Gao¹  Haipeng Song²  Ganyun Huang³ 

[1] School of Mechanical Engineering, Yangzhou University, Yangzhou 225127, China;Sino-European Institute of Aviation Engineering, Civil Aviation University of China, Tianjin 300300, China;Tianjin Key Laboratory of Modern Engineering Mechanics, School of Mechanical Engineering, Tianjin University, Tianjin 300072, China;

关键词: titanium alloy;    Ti6Al4V;    strain hardening behavior;    strain localization;    failure;   

DOI  :  10.3390/ma15103429

来源: DOAJ

【 摘 要 】

Uniaxial and notched tension samples are utilized to investigate the damage and failure of titanium alloy Ti6Al4V. The strain fields on the samples are obtained by the digital image correlation (DIC) method. Strain localization occurs before fracturing in all samples, and the width and size of the localized zone are characterized. Slant fractures are observed in uniaxial and notched tension specimen, which indicate that the initiation and propagation of cracks in thin sheet specimens are highly affected by the shear stress. Numerical simulations were performed for identification of hybrid hardening laws, and the results were compared with the experiments. The influence of the stress triaxiality on damage mechanism of Ti6Al4V was analyzed by observation of the specimen fracture surfaces using SEM. The results show that a higher stress triaxiality facilitates the formation and growth of micro-voids, which leads to a decrement of strain at failure.

【 授权许可】

Unknown