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Publications
Patel, SD. and Guedes Soares, C. (2018), “Reliability assessment of glass epoxy composite plates due to low velocity impact”, Composite Structures, Vol. 200, pp. 659-668
Probability of failure estimation of an offshore composite structure under low velocity impact is an essential requirement to incorporate the uncertainties associated with material properties and loads due to an impact. The material properties of composites exhibit a scatter mostly due to their in-homogeneity and anisotropic characteristics, brittleness of the matrix and fibre and manufacturing defects. In reality, the possibility of incidence of such a situation is due to large randomness arising in the structure. Stochastic finite element analysis of fibre reinforced plastic (FRP) plates under low velocity impact is performed to account the uncertainties of material properties and initial impact velocity. Impact induced failure of FRP structures are a stochastic process due to the scatter involved in material and impact behaviour. Since individual fault in the ply are not easy to track, a continuum damage model is implemented in a finite element code by a user-defined material subroutine to overcome these problems. The Gaussian process response surface method is adopted to determine the probability of failure. Comparative studies re also carried out for different combination of impactor velocities and mass. The probabilistic design optimization method is performed to attain superior strength and lighter weight of FRP structures.
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