Two-dimensional calculation method for composite material layer cracking

A composite material layer and calculation method technology, applied in the field of two-dimensional calculation of composite material spallation, can solve problems such as troublesome grid division, achieve the effects of low grid size requirements, avoid repeated iterations, and improve calculation efficiency
CN110245376AActive Publication Date: 2019-09-17HEFEI GENERAL MACHINERY RES INST +1
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
HEFEI GENERAL MACHINERY RES INST
Publication Date
2019-09-17

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Abstract

The invention discloses a two-dimensional calculation method for composite material layer cracking. The method comprises the following steps: S1, solving node displacement by adopting an extended finite element method; S2, based on the virtual crack closing technology, the energy release rate of the tip of the layer crack is obtained; S3, judging whether the layer cracks are expanded or not; and S4, when a predetermined load is reached or the structure fails, ending the calculation. The method has the advantages that the virtual crack closing technology and the expansion finite element method are combined, the expansion finite element is adopted for representing the layer crack, the unit boundary does not need to be matched with the crack shape when the grid is divided, and the grid does not need to be divided again when layer crack expansion is simulated; the requirement of layer cracking simulation on the unit size is reduced, and the calculation result is more accurate than that of a cohesion unit method; and when layer splitting expansion analysis is carried out, iteration is not needed, and the calculation efficiency is improved.
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Description

technical field

[0001] The invention relates to the field of damage simulation of composite materials, in particular to a two-dimensional calculation method for spallation of composite materials. Background technique

[0002] Due to the advantages of high specific modulus, high specific strength, and easy design of performance, composite materials are more and more widely used in aerospace, automotive, sporting goods, pressure vessels and other fields. However, multiple damage modes have been found in composite materials during use, including fiber breakage, matrix cracking, and lamination. Theory and engineering experience show that spallation is the most common damage mode of composite materials, and the occurrence of spallation will seriously reduce the structural strength, stiffness and integrity of composite materials. Therefore, the numerical analysis of spallation is of great significance to the structural design and strength analysis of composite materials. [0003...

Claims

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