Method for evaluating low-speed impact damage residual strength of winding composite material structure

Abstract

The invention relates to a method for evaluating low-speed impact damage residual strength of a winding composite material structure. Comprising the steps of 1, low-speed impact damage simulation calculation of the winding composite material structure; step 2, outputting and importing a unit damage state; a predefined field variable analysis method is adopted to achieve transmission of damage information between low-speed impact damage and residual strength simulation of the composite material structure; 3, establishing a low-speed impact damage residual strength model of the winding composite material structure containing the initial damage; step 4, calculating residual intensity; the winding composite material structure low-speed impact damage residual strength model established in the third step is obtained; the method can meet the requirement for predicting the residual strength of an existing winding composite material structure after low-speed impact damage, finite element simulation is applied to low-speed impact damage residual strength calculation of the winding composite material structure, and the damage state, obtained through low-speed impact simulation calculation, of a unit is imported into a finite element analysis model; therefore, the transmission of damage information is realized.

Description

technical field [0001] The invention relates to a method for evaluating the strength of a composite material, in particular to a method for evaluating the residual strength of a wound composite material structure due to low-speed impact damage. Background technique [0002] As a typical composite material structure, filament wound composite structure has the advantages of high specific strength, specific stiffness, winding line type and winding angle can be designed, etc. It is widely used in important strategies such as aviation, aerospace, missile weapons, and chemical industry. field. Unlike metallic structures, composite structures are very sensitive to the effects of mechanical shock loads, and matrix cracking, delamination, and damage can occur within the composite even when the impact energy is low and no visible damage occurs on the outer surface of the structure. Damage such as fiber breakage greatly reduces the strength of the structure and poses a potential and h...

AI Technical Summary

Problems solved by technology

However, most of the research objects in the existing research literature on the low-velocity impact of composite materials are laminated, braided and sandwich structures commonly used in the aviation industry, and there are few studies on the structure of fiber-wound composite materials.

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