OS0520 難燃性Mg合金を例にとった,微小き裂材の平均応力下における疲労限度の評価法の提案(OS5-5 寿命予測,OS-5 材料の疲労挙動と損傷評価2)

概要

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Evaluation method of the fatigue limit of material with small crack under tensile mean stress, using the stress ratio parameter and effective threshold stress intensity factor range (ΔK_<eff,th>), was proposed. By this method, the fatigue limit can be evaluated in high mean stress area and low mean stress area separately. In order to define the crack size, which is applied to the evaluation method, the variation of the small crack area affected by stress ratio was shown, using the relationship between threshold stress intensity factor range (ΔK_<th>) and the projected area of crack size in the direction of the load (√<area>). The higher stress ratio is, the smaller the upper crack size of small crack area is considered to be. Taking non-combustible Mg alloy as an example, tension-compression fatigue tests were carried out. Using the results of the tests, the validity of the proposed evaluation method was examined.
一般社団法人日本機械学会の論文
2011-07-16