熱・機械的負荷を受けるアルミ合金の非弾性変形特性と低サイクル疲労

概要

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In this paper, out-of-phase thermo-mecahnical fatigue tests are performed on the aluminum alloy that is used for engines of automobiles. The tests are conducted with three constant total strain amplitudes, three periods of cycle of loading and three temperature renges. These test conditions are chosen taking account of actual use of the alloy in engines. First, the detailed observation on the inelastic deformation due to thermo-mechanical loading is done, and we show the effect of strain amplitude, period of cycle of loading and temperature range on the deformation of the alloy. Second, the method to estimate number of cycle to fatigue failure is discussed. As a result, the relationship between the plastic work density per unit time, which is based on the concept of the plastic strain energy density, and number of cycle to fatigue failure is expressed by a formula irrespective of the test condition. Then, it is found that the plastic work density per unit time has an advantage to estimate number of cycle to fatigue failure due to the thermo-mechanical loading.
一般社団法人日本機械学会の論文
1998-01-25