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The Multiparticle Models of Multilayered Materials (models M4) are developedto analyze easily the 3D stress fields which produce delamination or transversecrackings in laminates. The M4 models are built from 3D approximate stressfields in z per layer and the Hellinger-Reissner's formulation. Here-in weexpress two of these models: the M4_5n model of which the kinematics, with 5nfields (n: number of layers), is the one of n Reissner's plates and, theM4_(2n+1)M model of membrane with 2n+1 fields. The latter gives simple analyticsolutions and a concentrated edge force per unit length that could be a naturalsupport for the criteria of delamination. We illustrate this concept by theanalytic resolution of (0 deg, 90 deg)s in traction and give some results formore complex stackings.

Modeles Multiparticulaires Des Materiaux Multicouches M4_5n et  M4_(2n+1)M Pour L'Analyse Des Effets De Bord Multiparticle Models of  Multilayered Materials M4_5n and M4_(2n+1)M for Edge Effect Analysis