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S45C調質材のき裂発生と伝ぱ挙動に関する確率疲労特性

真宏 後藤, 茂 福島, 弘信 西谷

Journal Article

Abstract

In order to study the probabilistic characteristics of the initiation and propagation of cracks, rotating bending fatigue tests of heat-treated 0.45 % C steel smooth specimens were carried out in three stress ranges (1.1σ_w < σ_a < 1.6σ_w,σ_w : fatigue limit). The 16 specimens were tested at each stress range. The following results were obtained through the successive observations of cracks which led to final fracture. The propagation life of a crack from initiation up to fracture, N_ , and the total number of cycles to fracture, N_f, are expressed by the three-parameter Weibull distribution. A slight dependency of the coefficient of variation, CV, in N_ on the stress range is recognized. Although the initiation life of a crack, N_i, is also expressed by the three-parameter Weibull distribution, the value of CV increases with the decrease in stress range.

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Keywords

16 specimens
 
coefficient
 
cracks
 
CV
 
CV increases
 
cycles
 
fatigue limit
 
fatigue tests
 
final fracture
 
following results
 
fracture
 
heat-treated 0.45 % C steel smooth specimens
 
initiation life
 
probabilistic characteristics
 
slight dependency
 
stress range
 
stress ranges
 
successive observations
 
three-parameter Weibull distribution
 
total number