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Title: Effect Of Shot Peening Variables On Bending Fatigue
Author: Horvath, J. A.
Source: Conf Proc: ICSP-1, (p.229-236)
Publication year 1981
Document number: 1981023
Number of pages: 7
Abstract:
A fractional factorial experiment was run to determine the effects of shot peening variables of shot size, wheel speed (shot velocity), and shot flow rate on the magnitude
and distribution of residual stress, and on fatigue life of SAE 1074 steel.
Shot peening has a beneficial effect on fatigue life, increasing the B63.2 life by about a factor of five over unpeened samples tested in three point bending. Highest
fatigue lives were obtained when peening gave a high residual surface compressive stress for a shallow depth.
A total shot stream energy concept was developed as a characteristic parameter of the process and indicates that an optimum value of energy exists to obtain maximum fatigue
life. Surface residual compressive stress reached a constant value at a relatively low shot stream energy while higher shot stream energy produced deeper and higher
residual compressive stress levels.
Descriptors: Shot peening; Fatigue life; Residual stress
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