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Title: Fatigue Property Enhancement By Fine Particle Shot Peening For Aircraft Aluminum Parts
Author: A.Inoue, T. Sekigawa and K. Oguri
Source: Conf Proc: ICSP-10 Tokyo, Japan 2008
Publication year 2008
Document number: 2008074
Number of pages: 5
Abstract:
ABSTRACT
Fine Particle Shot Peening (FPSP), which has been developed in the Japanese automobile industry for steel parts, enables to improve fatigue property much more than the
conventional Shot Peening (SP). The suitable FPSP process for the aluminum aircraft parts is under development. Fatigue life of conventional shot peened 7050-T7451 aluminum
parts was increased by several times, while that of fine particle shot peened aluminum was increased by more than ten times compared with that of as machined. Compressive
residual stress on fine particle shot peened surface which was covered with uniform dimples adequately is higher than that on shot peened surface. Fracture surface
observation revealed that the fatigue crack of fine particle shot peened samples originate at the subsurface layer, which shows the high compressive residual stress at very
near the surface and less roughened surface prevent crack initiation from the surface. Then FPSP can improve fatigue life farther more than SP does, which shows fatigue
crack initiates from a small flaws and laps on the surface created by SP.
KEY WORDS Fatigue enhancement, Fine Particle, High velocity, Aircraft, Smooth surface
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This page last revised: 03/22/2010