Influence of air shot blasting and temperature exposure on residual stresses and fatigue strength of notched specimens from alloys V95 and D16T

Abstract

The effect of air shot blasting and temperature exposure without load on residual stresses and limit endurance of smooth specimens and specimens with semicircular notches of aluminum D16T and V95 alloys was investigated experimentally. This research was done for the symmetric loading cycle in terms of bending and tensioncompression tests and the base of 107 cycles. The check of the calculated mean integral residual criterion stress to estimate the increment of the endurance limit of hardened parts with stress concentrators was completed. It was established experimentally and theoretically, that there is increment of increase in endurance limit hardened parts with stress concentrators in comparison with non-reinforced specimens, and temperature exposure leads to residual stresses relaxation and reduce the increment of the endurance limit.

Keywords

• surface hardening
• cylindrical sample
• semicircular cut
• residual stresses
• limit of resistance fatigue
• temperature exposure