圧電セラミックスの疲労損傷を考慮した構成式と損傷発展式の定式化

概要

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Damage development in piezoelectric ceramics under mechanical and electrical cyclic-loadings is represented by a damage variable based on the continuum damage mechanics, and an evolution equation of the damage variable is formulated by taking into account the effect of applied electric field on a fatigue life. In addition, the damage variable is incorporated into a constitutive equation of piezoelectric ceramics by using the modified cubes model; i.e. material constants of the constitutive equation are expressed as a material function of the damage variable. Then, the damage evolution equation and the constitutive equation are applied to a prediction of a fatigue life under various applied electric fields. Results of the prediction are compared with experimental results, and the validity of formulating the damage evolution equation and the constitutive equation is discussed.
社団法人日本機械学会の論文
2004-01-25