1308 アルミニウム合金の疲労き裂進展速度に及ぼすショットピーニングの影響(G03-2 き裂進展・疲労損傷・表面処理,G03 材料力学)

概要

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The objective of this research was to determine the effects of shot peening intensity on fatigue crack growth in 7075-T735 single-edged notch bend specimens (SENB) specimens. The SENB specimens were tested in the as-received and shot peened (with four Almen scales (4,8,12,16)) conditions, with crack perpendicular to the rolling direction, i.e. in the L-T direction. The striations in the SEM micrographs were used to calculate the crack growth rate, da/dN. The 3-D K along the curved and tunneled crack front in a loaded SENB specimen with residual stress measured by using an X-ray diffraction stress analyzer was obtained through the J integral computed from a 3-D finite element analysis. The crack growth rate at the initial phase of crack growth in the shot-peened specimens is significantly higher than that of the as-received specimen.
一般社団法人日本機械学会の論文
2005-09-18