Reliability evaluation for shot peened specimen of the aircraft components manufactured Al7075-T6 by accelerated life tests

Author:  Kim, Nam, Kang, Cheong
Source:  Conf Proc 2011: ICSP-11 South Bend, IN USA (pgs. 219-224)
Doc ID:  2011036
Year of Publication:  2011
Abstract:  
Abstract The object of this work is to consider reliability evaluation for shot peened specimen of the aircraft material Al7075-T6 by accelerated life tests (ALTs), which provides information more quickly on the life-time distribution of components. ALT, is commonly used under not only higher stress level but also higher temperature to induce early failures and to reduce testing efforts. Fatigue test of the shot peened specimen was executed by using the reasonable variety temperatures for the estimated life time with four-point rotary bending fatigue test. By changing the test temperature and the test profile amplitude, a simple equation was proposed to relate ALT durable durations to the equivalent stress. The laboratory testing of the ALT was carried out and the possible effects of errors in estimate of life time were investigated and discussed. Keywords: Accelerated life testing (ALT), shot peening, reliability evaluation, fatigue test.