残留応力が導入されたPMMA材における表面疲労き裂の寿命予測とき裂開閉口挙動の観察

概要

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Three-dimensional surface fatigue crack propagation experiments were conducted for PMMA with residual stresses to examine the life prediction method proposed previously by the present authors. The residual stresses were introduced by adhering three plates together when the central plate was loaded in tension or in compression. These three-layered specimens had tensile residual stresses in the center layer and compressive ones in the other layers, or vice versa. In addition, direct optical observations of the crack closure behavior were conducted. This direct observation was made possible based on the fact that sodium light penetrated straight through fracture surfaces when they were in contact with each other, while it was reflected on the fracture surfaces when they were separated. It was found that the life prediction method worked fairly well for predicting crack propagation behavior in PMMA with residual Stresses.
社団法人日本機械学会の論文
1997-11-25