Damage analysis of the stratified curved plate

Saad, Mohamed; Ouinas, Djamel

Journal of Materials and Engineering Structures
Volume 5, Numéro 3, Pages 223-236
2018-09-30

Damage Analysis Of The Stratified Curved Plate

Authors : Saad Mohamed . Ouinas Djamel .

Abstract

This paper deals with numerical analysis of dynamic behavior of a curvilinear graphite / epoxy composite shell under the effect of different impact loads at low speeds. Damage is assumed to initiate when one of Hashin’s failure criteria is satisfied, and its evolution is modeled by Mindlin’s Formulation with geometric non-linearity. This has been accomplished by developing a user defined subroutine and implementing it in the FE software ABAQUS. From strains supplied by ABAQUS the material subroutine uses a micromechanics approach based on the method of cells and values of material parameters of constituents to calculate average stresses in an FE, and checks for Hashin’s failure criteria. If damage has initiated in the material, the subroutine evaluates the damage developed, computes resulting stresses, and provides them to ABAQUS. The computed time histories of the impact loads acting are found to agree well with the numerical ones available in the literature, and various damage and failure modes agree qualitatively with those observed in tests.