衝撃破壊破面のX線フラクトグラフィ手法とその損傷解析への適用

概要

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To study the plastic zone size of dynamic fracture surface,instrumented Charpy impact tests of high carbon bearing steels were conducted.The plastic zone size beneath the frature surface was evaluated by the X-ray diffraction parameters.The results gave the following three experimental conclusions.The first,a good correlation exists between the plastic zone size and the dynamic stress intensity factor as w_y=(a(K_d/σ_r)^2,and the values values of α depend on materials.The second,α can be calculated from the equation a=0.15[(B_0+2.12)/(B_f+2.12)]^2,where B_0 is the average half-value breadth of the base material and B_F is the maximum half-value breadth beneath the fracture surface.The third,both w_y and α can be simultaneously measured on the fracture surface,and K_d can be evaluated by using the above two equations.This tehnique was applied to an actual fracture surface and confirmed to be very effective for failure analysis.It is advantageous over other test methods and it will find wider applocation in the industry.
社団法人日本材料学会の論文
1993-12-15