Anisotropy of Mechanical Behavior in Commercially Pure Titanium Sheets

Qiang Cao, Qingdong Zhang,Xiaofeng Zhang

(School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, China)



Abstract:

Commercially pure titanium (CP Ti) sheets show typical planar anisotropy due to inherently crystallographic texture and rolling process. To characterize the initial, planar, plastic anisotropy of CP Ti sheets in forming process, uniaxial tensile tests of cold-rolled TA1 sheets at 0°, 45° and 90° to the rolling direction were performed at room temperature, corresponding stress-strain curves and Lankford coefficient (r value) were obtained. Based on Hill’48 and Barlat’89 yield criteria, the anisotropic behavior of TA1 sheets was investigated. In order to verify the accuracy of two models, the experimental values of yield stress and r were compared with predicted ones. It revealed that Barlat’89 criterion with M=6 is the best agreement with experimental data, and the obtained model can be used in the simulation of forming process.

Key words:  commercially pure titanium  anisotropy  yield criterion  mechanical behavior

DOI：10.11916/j.issn.1005-9113.2015.01.010

Clc Number:TG146.2+3

Fund: