English: Internal forces in a continuum body. The continuum is divided into two portions by a surface S which encloses an arbitrary volume of the continuum. The action of the external portion on the internal portion produces an equipollent or equivalent force and moment distribution on a differential surface on S. The stress vector T is define as the differential force over the differential area S as the latter tends to zero.
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{{Information |Description={{en|1=Internal forces in a continuum body. The continuum is divided into two portions by a surface S which encloses an arbitrary volume of the continuum. The action of the external portion on the internal portion produces an eq