Synergy effects in the fatigue crack growth of hole cold expanded specimens under variable cyclic loading

被引：7
作者：
Ambriz, R. R. [1 ]
Garcia, C. [2 ]
Rodriguez-Reyna, S. L. [2 ]
Ramos-Azpeitia, M. [2 ]
Jaramillo, D. [1 ]
机构：
[1] Inst Politecn Nacl CIITEC IPN, Cerrada Cecati S-N, Ciudad De Mexico 02250, Mexico
[2] Univ Autonoma San Luis Potosi, Fac Ingn, Av Dr Manuel Nava 8, San Luis Potosi 78290, San Luis Potosi, Mexico
来源：
INTERNATIONAL JOURNAL OF FATIGUE | 2020年 / 140卷
关键词：
Crack growth rate; Hole cold expansion; Residual stresses; Retardation; Overloads; RESIDUAL-STRESSES; FRACTOGRAPHY; OVERLOADS;
D O I：
10.1016/j.ijfatigue.2020.105807
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
The influence of variable load spectra in the fatigue crack growth (FCG) was analyzed. A 4.1% interference was pre-set to some specimens by an expansion operation. As-drilled hole and hole expanded specimens were subjected to FCG tests under a combination of baseline cyclic loading and periodic overloads or underloads applied. Fatigue life was of approximately 1 million of cycles for the as-drilled hole, and 3.5 million of cycles for the hole cold expanded. The pre-setting operation and variable load spectra interaction exhibited a synergy, which was associated with multiple periods of retardation and arresting observed in the crack growth rate.
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页数：12
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