Title: FEM and experiment-based initial residual stress field construction for titanium alloy monolithic component blank

Authors: Yong Yang; Wei Zhu

Addresses: Department of Mechanical Engineering, Qingdao Technological University, No. 11, Fushun Road, Sifang District, Qingdao City, Shandong Province, China ' Department of Mechanical Engineering, Qingdao Technological University, No. 11, Fushun Road, Sifang District, Qingdao City, Shandong Province, China

Abstract: An annealing process analysis of titanium alloy monolithic component blank was proposed based on finite element method (FEM), which was employed to construct initial residual stress field. Several key technologies, such as sequentially coupled thermal and mechanical procedure, heat conduction equation, boundary condition and fundamental equations, have been implemented to improve the accuracy of finite element simulation. To verify finite element simulation results, the stress experiment was performed by combining stripping layer method with X-ray diffraction technique. The predicted residual stress values were compared with experimental data and found to be in good agreement, indicating that the initial residual stress field constructed in this paper was right. The research results show that the margin region of blank cools the fastest and next is the surface layer, while the centre region cools the slowest; there is large thermal stress difference between surface layer and centre region along thickness direction, while the small difference along the length and width direction; the stress radiates from the centre region to outside, the centre region being the maximum value, then decreases gradually, until a minimum value is attained at the corner.

Keywords: titanium alloys; initial residual stress; annealing process; finite element method; FEM; monolithic component blanks; simulation; thermal stress.

DOI: 10.1504/IJCAET.2015.072602

International Journal of Computer Aided Engineering and Technology, 2015 Vol.7 No.4, pp.481 - 495

Received: 26 Jun 2013
Accepted: 16 Oct 2013
Published online: 22 Oct 2015 *

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