The Effect of Stress Rate on Slow Crack Growth Parameter Estimates

2009 ◽  
pp. 213-213-15 ◽  
Author(s):  
JA Salem ◽  
MG Jenkins
Keyword(s):  
Crack Growth ◽  
Slow Crack Growth ◽  
Growth Parameter ◽  
Stress Rate ◽  
Parameter Estimates

scholarly journals Slow Crack Growth Analysis of Advanced Structural Ceramics Under Combined Loading Conditions — Damage Assessment in Life Prediction Testing

2000 ◽  
Author(s):  
Sung R. Choi ◽  
John P. Gyekenyesi
Keyword(s):  
Experimental Data ◽  
Crack Growth ◽  
Growth Analysis ◽  
Numerical Solutions ◽  
Slow Crack Growth ◽  
Constant Stress ◽  
Stress Rate ◽  
Loading History ◽  
Rate Testing ◽  
Testing Case

Slow crack growth analysis was performed with three different loading histories including constant stress-rate/constant stress-rate testing (Case I loading), constant stress/constant stress-rate testing (Case II loading), and cyclic stress/constant stress-rate testing (Case III loading). Strength degradation due to slow crack growth and/or damage accumulation was determined numerically as a function of percentage of interruption time between the two loading sequences for a given loading history. The numerical solutions were examined with the experimental data determined at elevated temperatures using four different advanced ceramic materials, two silicon nitrides, one silicon carbide and one alumina for the Case I loading history, and alumina for the Case II loading history. The numerical solutions were in reasonable agreement with the experimental data, indicating that notwithstanding some degree of creep deformation presented for some test materials slow crack growth was a governing mechanism associated with failure for all the test materials.

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