A Newtonian interpretation of configurational forces on dislocations and cracks

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• 作者：Roberto Ballariniup>aup>up> ; up>up>rballarini@uh.edu" class="auth_mail" title="E-mail the corresponding authorup> ; Gianni Royer-Carfagniup>bup>up> ; up>up>cup>up> ; up>up>gianni.royer@unipt.it" class="auth_mail" title="E-mail the corresponding authorup>
• 关键词：Configurational forces ; Eshelbian forces ; Newtonian mechanics ; Dislocations ; Cracks ; Perturbative methods ; J-integral
• 刊名：Journal of the Mechanics and Physics of Solids
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：95
• 期：Complete
• 页码：602-620
• 全文大小：1450 K

文摘

Configurational forces are fundamental concepts in the description of the motion of dislocations, cracks and other defects that introduce singularities within the solid state. They are defined by considering variations in energies associated with the movement of such defects, and are therefore different from the classical forces that enter the balance laws of classical Newtonian mechanics. Here, it is demonstrated how a configurational force can be viewed as the resultant of the (Newtonian) contact forces acting on the perturbed shape of an object of substance equivalent to the defect, and evaluated in the limit of the shape being restored to the primitive configuration. The expressions for the configurational forces on the paradigmatic examples of cracks and dislocations are in agreement with those determined using classical variational arguments. This finding opens a new prospective in the use of configurational forces by permitting their physical and intuitive visualization.