scholarly journals Studies on the Fatigue Crack Growth under Random Loading (1st Report)

1984 ◽  
Vol 1984 (156) ◽  
pp. 513-522
Author(s):  
Junkichi Yagi ◽  
Masafumi Asada ◽  
Yasumitu Tomita ◽  
Takashi Sugimoto
Keyword(s):  
Fatigue Crack ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Random Loading

The Effect of Material Heterogeneity and Random Loading on the Mechanics of Fatigue Crack Growth

1986 ◽  
Vol 108 (3) ◽  
pp. 268-275
Author(s):  
T. S. Srivatsan ◽  
M. Sambandham ◽  
A. T. Bharucha-Reid
Keyword(s):  
Growth Rate ◽  
Fatigue Crack ◽  
Crack Growth Rate ◽  
Fatigue Crack Growth ◽  
Crack Growth ◽  
Material Constant ◽  
Random Variable ◽  
Present Theory ◽  
Nickel Steel ◽  
Random Loading

This paper reviews the experimental work on the influence of variable amplitude or random loads on the mechanics and micromechanisms of fatigue crack growth. Implications are discussed in terms of the crack driving force, local plasticity, crack closure, crack blunting, and microstructure. Due to heterogeneity in the material’s microstructure, the crack growth rate varies with crack tip position. Using the weakest link theory, an expression for crack growth rate is obtained as the expectation of a random variable. This expression is used to predict the crack growth rates for aluminum alloys, a titanium alloy, and a nickel steel in the midrange region. It is observed using the present theory that the crack growth rate obeys the power law for small ΔK and that the power is a function of a material constant.

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