Method for analyzing residual compression strength of composite materials after impact damage

Abstract

The invention belongs to the field of structural damage tolerance design of composite materials, and specifically relates to a method for analyzing residual compression strength of composite materials after impact damage; and the method is used for determining the residual compression strength of composite materials after impact damage. The method comprises three steps of 1, selecting a Hanshin failure criterion as a damage failure criterion for low-speed impact of a laminated plate according to failure characteristics of a composite material; 2, importing the Hanshin failure criterion by adopting a large-scale dynamic finite element program DYTRAN, so as to calculate a damage area under the low-speed impact of the laminated plate; and 3, carrying out rigidity attenuation on a damage area after the low-speed impact according to the damage area determined in the second step, and calculating the residual compression strength of the laminated plate after the low-speed impact by adopting a global-local model analysis method. The invention discloses a brand new analysis method, so that the residual strength of typical components of composite materials after impact damage can be effectively predicted, and basis is provided for the structural design, analysis and verification of the composite materials of airplanes.

Description

technical field

[0001] The invention belongs to the field of damage tolerance design of composite material structures, and is an analysis method for determining the residual compressive strength of composite materials after impact damage. Background technique

[0002] Composite materials are very sensitive to low-velocity impact damage of many types of foreign objects, and low-velocity impact will greatly weaken the pressure-bearing capacity of composite laminate structures. At present, for the damage tolerance analysis of composite materials with barely visible impact damage, the method of setting the allowable strain is generally adopted in China, and the residual compressive strength of the laminate after impact is calculated according to the set allowable strain. Before this analysis method is successfully studied, there is no suitable analysis method that can fully consider the influence of factors such as the change of layup and thickness of the composite structure and...

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