Abstract
The novel destructive method, which is based on enlarging of initial cold-expanded hole diameter, is developed for quantitative assessment of fatigue damage accumulation. The secondary hole diameter increments in principal strain directions are measured at different stages of low-cycle fatigue. These data offer construction of normalized dependencies of principal residual strains, related to the secondary hole diameter, against of lifetime percentage, thus providing a explicit form of the damage accumulation function. These functions are obtained for mandrel entrance and exit side. Obtained information reveals peculiarities of damage accumulation depending on residual stress level. The results also demonstrate how stress ratio influences on the damage accumulation process under low-cycle fatigue conditions.
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