Multiscale Prediction Method for Progressive Failure of Composite Laminates Under Low Velocity Impact

Abstract

The invention relates to the field of damage prediction of a composite laminate, aiming at providing a multi-scale prediction method for progressive failure of a composite laminate under low-velocityimpact. The method comprises the following steps: establishing a low-velocity impact finite element model containing a punching hammer, a composite laminate and a support plate; establishing a multi-scale prediction method of composite materials based on micromechanics; solving stress, strain and damage of the composite laminate under s low-velocity impact load based on a multi-scale method; and calculating the low-velocity impact to further obtain the impact force, displacement, velocity and acceleration. A macroscopic progressive failure behavior is predicted from a microscopic point of view; and compared with a research method based on the macromechanics theory of a composite material, the invention considers the influence of the difference of mechanical properties of microscopic fibersand matrixes on the macromechanics properties of the composite laminate, and more essentially and more accurately predicts the progressive failure behavior of the composite laminate under the low-velocity impact load.

Description

technical field

[0001] The invention relates to the field of damage prediction of composite material laminates, in particular to a multi-scale prediction method for progressive failure of composite material laminates under low-velocity impact. Background technique

[0002] At present, composite laminates are widely used in high-tech fields such as aerospace, wind power generation, and automobiles. However, low-velocity impact damage has a great influence on the strength, stiffness and residual properties of composite laminates. Therefore, it is necessary to clearly understand the progressive failure process of composite laminates under low-velocity impact.

[0003] The existing low-velocity impact studies of composite laminates at home and abroad are basically based on macroscopic failure criteria (such as Hashin, Puck and Phiho failure criteria, etc.) to identify complex composite damage modes. Although the above-mentioned macroscopic failure criteria realize the predictio...

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