| Autor: |
Zinoviev, Peter A., Grigoriev, Sergei V., Lebedeva, Olga V., Tairova, Ludmilla P. |
| Zdroj: |
Composites Science and Technology; 1998, Vol. 58 Issue: 7 p1209-1223, 15p |
| Abstrakt: |
The paper presents a model that describes the deformation and failure processes of multilayered hybrid composites in a state of plane stress. The model, which can be considered as a structural-phenomenological one, is a coupled deformation/failure model (DFM). According to the model, except for two common states of the composite laminate--the initial state (monolithic material) and the final state (completely broken material)--there exists a group of intermediate states, namely the material with cracks. Within the group, we can distinguish two further sub-groups of material states: (1) with open cracks and (2) with closed cracks. The total number of states equals eight (four in the 'open-crack' group). The algorithm of successive stress loading is a natural one for the model. The low shear modulus of modern polymeric composites often results in significant changes in the initial reinforcing angles of the plies as a consequence of shear strains, which is why the model considers the effects of the 'structural non-linearity' of the laminate. The algorithm is capable of predicting both stress/strain curves and failure envelopes for multilayered composites under a variety of loading conditions. Theoretical predictions are presented for a number of cases provided by the organisers of the failure exercise. |
| Databáze: |
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