Comment on 'energy release rate and crack propagation in piezoelectric materials-I: Mechanical/electrical load, II: Combined mechanical and electrical loads'

摘要

In solving several kinds .of coupled problems of elastic continuum the universal concept of energy balance has been applied to take into account the interaction of fields of mechanical and non-mechanical origins. This is also prevalent in the fracture mechanics and other problems in electro-elasticity. Recent papers of Kumar and Singh (1,2) (and related papers) have shown, however, that a misinterpretation of fundamentals of energy balance in quasi-static coupled problems can lead to incorrect results.