破面からのエキソ電子放射挙動

概要

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The information obtained from fractures surface is quite relevant to failure analysis. In the present study,it was investigated whether the Exo-electron emission phenomena can be successfully applied to failure analysis. The Exo-electron (EE) emission from the fracture surface of a toughness test specimen was observed by using a scanning Exo-electron emission microscope. The difference in EE emission behavior between fatigue fracture and ductile fracture surface as well sa the time decay of EE emission intensity were investigated. A significant difference in EE emission intensity was observed between fatigue fracture and ductile fracture surface. A good correlation was found between the J-integral range at fatigue cracking and the EE emission intensity of the fatigue fracture surface. The characteristics of decay of EE emission intensity was given as I_<(t)>=I_0epx(k_1t)[A+Bexp(-k_2t)] where I_0 is the intnsity of EE emission at t=0, K_1, k_2, A and B are constants. There is a Good correlation between ΔJ and K_1. ΔJ can be estimated by determining the K_1 value from the decay curve.
社団法人日本材料学会の論文
1986-12-15