初期引張残留応力場をき裂が進展した疲労破面におけるX線フラクトグラフィ(<特集>X線材料強度)

概要

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Fatigue tests were performed using CCT specimens having initial tensile residual stress caused by welding. The residual stress distribution on the fatigue fracture surface was measured by X-ray diffraction method. The monotonic plastic zone depth corresponds to the K_<max, true> which is the sum of the K_<max> related to the applied maximum stress and the K_<res> caused by the initial residual stress. So, if the initial residual stress distribution is known, the K_<max> or the applied maximum stress can be estimated from the monotonic plastic zone depth. The residual stress on the fatigue fracture surface corresponds to the sum of the tensile residual stress related to the K_<max, true> and the compressive residual stress related to the ΔK_<eff>. So, even if the initial residual stress distribution is unknown, the ΔK_<eff> or the stress amplitude can be estimated from the residual stress on the fatigue fracture surface and the monotonic plastic zone depth.
社団法人日本材料学会の論文
1996-07-15