The numerical simulation of the influence of orientational vibratory stress relief to aluminium alloy 7075-T651 fatigue life

DOI

10.2991/mmeceb-15.2016.148How to use a DOI?

Keywords

Orientational VSR, 7075-T651, Residual stress, Fatigue limit.

Abstract

For the application situation of traditional vibratory stress relief (VSR) method, technology of orientational VSR was proposed, that is the residual stress distributions of workpiece is simulated by use of finite element method, and then determine the part of workpiece need to reduce residual stress, select the appropriate modal according to the geometry of workpiece and vibrated for residual stress relief. Firstly, the modal analysis was carried out on aluminum alloy 7075-T651 specimen by using finite element method, determine middle section of specimen for VSR, and choose the first order bending vibration mode for vibration mode. The simulation of dynamic stress for specimen was carried out by using transient dynamic analysis method. It is concluded that a linear relationship between the dynamic stress in the direction of Z axis (axial direction of specimen) and amplitude. Secondly, we assigned initial stress in the middle section along the Z axis (axial direction of specimen) of the specimen, the finite element model that contained initial stress for VSR simulation was established, VSR simulated by using transient dynamic analysis method. It is concluded that a quadratic relationship between surface residual stress of the specimen and amplitude. Finally, the fatigue simulation was carried out by using FE-safe software. It is concluded that fatigue strength increased with amplitude, but the phenomenon “much vibration” appeared when amplitude continues to increase that led to decrease of fatigue strength and a quadratic relationship between fatigue limits and amplitude.

Copyright

© 2016, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Jing Song
AU  - Yidu Zhang
AU  - Ke Sun
PY  - 2015/12
DA  - 2015/12
TI  - The numerical simulation of the influence of orientational vibratory stress relief to aluminium alloy 7075-T651 fatigue life
BT  - Proceedings of the 2015 2nd International Conference on Machinery, Materials Engineering, Chemical Engineering and Biotechnology
PB  - Atlantis Press
SP  - 748
EP  - 755
SN  - 2352-5401
UR  - https://doi.org/10.2991/mmeceb-15.2016.148
DO  - 10.2991/mmeceb-15.2016.148
ID  - Song2015/12
ER  -