Static strength equivalent analysis method for composite laminates considering assembly defects

Abstract

The application provides a composite laminate structure static strength equivalent analysis method considering assembly defects, comprising: constructing a finite element simulation model considering structure assembly defects, constructing a nonlinear regression model of assembly defects-characteristic parameters according to the obtained load-displacement curve characteristic parameters; adopting material property equal ratio degradation form for degradation, and carrying out static strength simulation on different degradation indexes, and training a nonlinear regression model corresponding to the degradation index-characteristic parameters based on the simulation results; finally, based on the two nonlinear regression models established in the foregoing, taking the load-displacement curve characteristic parameters as intermediate items, and taking the mixed connection structure assembly defects as input, the material degradation index is reversely predicted, and the establishment of the equivalent prediction model of the assembly defects-degradation index is realized. The application solves the problems of composite static strength prediction difficulty and calculation period under the influence of assembly defects.

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