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Numerical analysis for effects of shot peening on fatigue crack growth
被引:17
作者:
Liu, Jinxiang
[1
]
机构:
[1] Beijing Inst Technol, Sch Mech Engn, Beijing 100081, Peoples R China
基金:
中国国家自然科学基金;
关键词:
Shot peening;
Fatigue crack growth;
Short cracks;
Cohesive zone model;
Finite elements;
COHESIVE ZONE MODEL;
PARAMETERS;
D O I:
10.1016/j.ijfatigue.2012.02.010
中图分类号:
TH [机械、仪表工业];
学科分类号:
0802 ;
摘要:
In the present work numerical analysis for effects of shot peening on fatigue crack growth are reported and discussed. Simulations reported in the present work use irreversible cohesive zone model and are based on experimental data for a Nickel-based superalloy. The capability of the cohesive zone model to catch the effects of short crack is investigated. The two-dimensional computations fit known experimental records in the CT specimen which confirms that the cohesive zone model has the potential for engineering application. The fatigue crack growth of shot-peened specimens are studied for different loading amplitudes and different shot peening intensities. The numerical results reveal that the crack initiation position and time depend not only on the shot peening intensity but also on the cyclic loading amplitude. Retardation of fatigue crack growth is more effective at lower loading amplitude for shot-peened specimens, and higher applied loading will eliminate the beneficial effects of shot peening. (C) 2012 Elsevier Ltd. All rights reserved.
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页码:101 / 108
页数:8
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