Cumulative Damage in the Low Cycle Fatigue

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概要

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• The authors proposed a hypothesis of cumulative damage due to the low cycle fatigue and gave the following formula for fatigue fracture criterion for the multi-stage loading test; Σ^^p__<i=1>(n_iΔW_<ci>)(σ_<maxi>)^α=C(σ_<maxp>)^β where n_i and ΔW_<ci> are number of cycles and plastic strain energy per cycle in the i-th stage, respectively; σ_<maxi> and σ_<maxp> denote maximum tensile stresses in the i-th and final stages, respectively; α, β and C are material constants. Experimental data on stainless steel show that the above formula approximately holds good. The above formula is transformed into Σ^^p__<i=1>a_i(n_i/N_<fi>)=1 for multi-stage constant strain cycling test. Deviations in the experimental value of Σ(n_i/N_<fi>) from Miner's damage rule may be explained by this formula.

• 一般社団法人日本機械学会の論文

著者

• Shiratori Eiryo

  Research Laboratory Of Precision Machinery And Electronics Tokyo Institute Of Technology

• Obataya Yoichi

  Laboratory Of Precision Machinery And Electronics Tokyo Institute Of Technology

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