Numerical simulation method for Ti/CFRP laminated plate structure under impact load

Abstract

The invention discloses a Ti / CFRP laminated plate structure impact process numerical simulation method. The method comprises the following steps: constructing a VUMAT subprogram of a composite material based on the stress-strain relation of the composite material, a three-dimensional Hashin failure criterion and a Tan degradation criterion; constructing a finite element mesh model of the Ti / CFRP laminated plate structure and the hemispherical punch; constructing a material failure model of a titanium alloy plate and an adhesive layer in the Ti / CFRP laminated plate grid model; constructing an initial condition of the impact load; constructing boundary conditions of the Ti / CFRP laminated plate grid model; and combining the constructed VUMAT subprogram with the constructed model and conditions by utilizing ABAQUS to obtain a numerical analysis model of the Ti / CFRP laminated plate structure under the impact load, and solving to obtain the contact force of the laminated plate structure andthe damage failure area of the composite material. According to the invention, the damage failure of the Ti / CFRP laminated plate structure in which forms and the corresponding failure area under the impact load can be simulated, and a more accurate reference basis is provided for the structural design of the Ti / CFRP laminated plate.

Description

technical field [0001] The invention relates to the field of numerical simulation, in particular to a numerical simulation method for a Ti / CFRP laminate structure under impact load. Background technique [0002] Compared with metal materials, carbon fiber reinforced composite materials (CFRP) have good mechanical properties such as light weight, high specific strength, high toughness, high temperature resistance, and corrosion resistance, and have been widely used in aviation, aerospace, weapons, ships, automobiles, etc. . However, composite materials have weak impact resistance and are prone to damage after being impacted. In order to improve the impact resistance of composite materials, metal plates are generally attached to the surface of composite laminates by means of adhesive or mechanical connection to form a new laminate. Titanium alloy / carbon fiber (Ti / CFRP) composite laminate is a typical laminate. When the side of the titanium alloy plate is subjected to impact ...

AI Technical Summary

Problems solved by technology

Titanium alloy / carbon fiber (Ti / CFRP) composite laminate is a typical laminate. When the side of the titanium alloy plate is subjected to impact load, the kinetic energy of the impact load will be transferred from the titanium alloy plate to the composite laminate. Although the titanium alloy plate will absorb part of the kinetic energy, it is still possible to cause damage to the composite laminate without destroying the titanium alloy plate. In order to ensure the safety and reliability of the Ti / CFRP laminate structure, it is necessary to withstand the impact load Analysis of the Ti / CFRP laminate structure

In the paper "Numerical Simulation of High-speed Impact of Ti / CFRP / Ti Sandwich Structure", Ding Bing et al. used the two-dimensional Hashin failure criterion for composite materials that comes with ABAQUS software to simulate the damage and failure of composite materials, but they could not get the specific forms of composite materials. damage failure

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