3次元応力疲労における破壊寿命曲線の近似

概要

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Fracture surface patterns caused by the fatigue due to three-dimensional stresses are different from those by the fatigue due to one-dimensional stresses because of lamellar flaking patterns formation in the former fatigue. But, in both cases, when internal-structures are changed and the changing has progressed to some extent, rubber molecular chains are broken and initial cracks are generated perpendicular to principal tensile stresses. In this study, assuming that the tendencies of the life curves for one-dimensional and three-dimensional stresses are the same, the life curve (logKβ-logLβ) is expressed as an approximation of the life curve (logK-logL) by shifting α along the normalized life axis and β along the normalized stress axis. The life curve (logKβ-log Lβ) is a normalized curve given by normalizing the maximum tensile stresses and life time in three-dimensional stresses by dividing them respectively by the fracture stresses and the fracture time in one-dimensional stresses, and logK-logL curve is a normalized life curve in one-dimensional stresses, and α and β are the ratios of the fracture time and stress in one-dimensional stresses to those in three-dimensional stresses.
日本ゴム協会の論文