NUMERICAL MODEL OF PROCESS-INDUCED DEFORMATION IN COMPOSITE PARTS CONSIDERING MOULD AND MATERIAL VISCOELASTICITY

Abstract

Abstract: Considering the mould influence and material viscoelasticity, a three-dimensional numerical model of process-induced deformation and residual stress in composite parts was established. The interfacial shear stress between the mould and part was introduced to simulate the mould-part interaction during heat-up. The influences of temperature and degree of cure on the material mechanical properties were analyzed, and the linear elastic and viscoelastic constitutive equations were used to describe the material stress-strain relationship before and after the gelation, respectively. The finite element model simulating the composite curing process was established in ABAQUS software by using thermal-stress sequential coupling analysis method, and the temperature field, cure degree field, residual stress and deformation during curing were analyzed. Finally, the rationality and accuracy of the model established are verified by comparing with the experimental results of process-induced deformation. The results show that the residual stress generated during curing in the unidirectional and unsymmetric laminates is asymmetrically distributed in the thickness direction, which is the primary reason for laminates deformation after demoulding.

Key words: composites, process-induced deformation, residual stress, mould-part interaction, material viscoelasticity

CLC Number:

TB332

QIAO Wei, YAO Wei-xing, HUANG Jie. NUMERICAL MODEL OF PROCESS-INDUCED DEFORMATION IN COMPOSITE PARTS CONSIDERING MOULD AND MATERIAL VISCOELASTICITY[J]. Composites Science and Engineering, 2020, 0(10): 67-74.

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