Title of article :
Microcrack propagation and fatigue lifetime under non-proportional multiaxial cyclic loading
Author/Authors :
Weick، Matthias نويسنده , , Aktaa، Jarir نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2003
Pages :
-1116
From page :
1117
To page :
0
Abstract :
Non-proportional multiaxial fatigue tests of tubular specimens were performed under purely alternating strain-controlled loading. Different loading paths with different phase shifts were applied. With increasing phase shift at the same equivalent load, the lifetime was found to increase. For lifetime prediction a model based on the Manson-Coffin law was developed. By including the hydrostatic loading part, it was possible to compare the results of the multiaxial fatigue tests with uniaxially ascertained results. To obtain more information about the microcrack behaviour under multiaxial non-proportional loading, sonic emission studies and fractographic analyses were performed. The results suggest a discontinuous microcrack propagation. Motivated by the good agreement between these observations and some microcrack propagation models known from literature, a simplified model was proposed for micro and short crack propagation. This model which is based on the J-integral range ?J yields a quite good agreement between the experimentally observed and the calculated lifetimes.
Keywords :
High cycle fatigue , low cycle fatigue , Predamage , Titanium alloy , Damage mechanisms
Journal title :
INTERNATIONAL JOURNAL OF FATIGUE
Serial Year :
2003
Journal title :
INTERNATIONAL JOURNAL OF FATIGUE
Record number :
84354
Link To Document :
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