薄板切欠き試験片の片振り低サイクル疲労過程の塑性域内の応力およびひずみ分布の測定とき裂伝ぱ

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Stress and strain distributions in the plastic zone of notched thin sheet specimens were measured by an X-ray diffractometer and strain gauges, respectively. The results obtained are as follows. (1) The stress and strain distributions obtained under ;?? monotonic load were similar to those estimated with the plasticity assumption. They are expressed as [numerical formula] where r=x+ρ/4, ρ is the notch radius and x is the distance from the notch root. In this case, the plastic zone boundary was clearly identified in the stress distribution diagram, On the other hand, under repeated tensile load, the stress-range and strain-range distributions were similar to those estimated with the elasticity assumption. They are expressed as [numerical formula] In this case, no clear plastic zone boundary was observed in the stress range distribution diagram. This must have resulted from the fact that the elastic strain is much larger than the plastic strain in the stress-strain hysteresis loop, even at the notch root. (2) The stress and stress range distributions measured by X-ray method can be estimated accurately from the strain and strain range distributions by using the stress-strain curves. (3) The relationship between the crack propagation rate and the stress intensity factor in the case of repeated zero-tension load in the range of da/dN=10^<-3>-10^<-1>(mm/cycle) was similar to that in the range of da/dN=10^<-5>-10^<-4>(mm/cycle) , even though the former range did not satisfy the small scale yielding condition. This should be considered as a circumstantial evidence for the model obtained in (1), i. e. the stress (or strain) -range distribution in the plastic zone is similar to that estimated with the elasticity assumption.
社団法人日本材料学会の論文
1977-06-15

薄板切欠き試験片の片振り低サイクル疲労過程の塑性域内の応力およびひずみ分布の測定とき裂伝ぱ

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