ON NONLINEAR ELASTICITY THEORY FOR CRYSTAL DEFECTS

In recent years, modifications of nonlinear elasticity theory for crys tals have been used successfully to analyze phenomena associated with twinning and phase transitions involving changes in crystal symmetry. Here, I attempt to assess how adapting the ideas to dislocation theory could bring in some mechanisms not present in linear dislocation theo ry, and why this might help us better understand plasticity phenomena. Conversely, twinning theory could benefit from adapting ideas used in dislocation theory. (C) 1998 Elsevier Science Ltd. All rights reserve d.