复合材料残余应力和固化变形数值模拟及本构模型评价

doi:10.11896/cldb.18110061

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Abstract For the sake of evaluating the applicability of various constitutive models, a three-dimensional numerical model was constructed to predict the residual stresses/strains and process-induced deformations of composite structures. The model consisted of thermo-chemical analysis mo-dule and thermo-mechanical analysis module, taking thermo-chemical coupling, anisotropy of material properties, chemical shrinkage and viscoelasticity into consideration. Three typical constitutive models of linear elasticity, viscoelasticity and path-dependent were employed to predict the residual stresses/strains and deformations. Furthermore, comparison of simulated results and test results were carried out to verify the validity of the constructed numerical model, and emphasis was put on the study of the applicability of various constitutive models. According to the results, the viscoelastic constitutive model performed best, presenting favorable predicted results of residual stresses/strains and deformations. The path-dependent constitutive model held slightly worse performance than the viscoelastic one, showing encouraging predicted results of resi-dual strains and deformations, nevertheless, unsatisfactory predicted results of residual stresses. The linear elastic constitutive model exhibited the worst performance, achieving accepted predicted result of the residual strains and deformations for only thinner composite structures.

Key words： composite constitutive model residual stress process-induced deformation viscoelasticity

Published: 28 October 2019

CLC number:

TB332

Fund:This work was financially supported by the Priority Academic Program Development of Jiangsu Higher Education Institutions.

About author:: Wei Qiao has been a doctor candidate in Nanjing University of Aeronautics and Astronautics (NUAA) since 2016. He is mainly engaged in the simulation and control of composite process-induced deformation;Weixing Yao is professor, PhD tutor in College of Aeronautics and Aerospace of Nanjing University of Aeronautics and Astronautics, whose research interests are manufacture-process integration design of composite structure, aircraft general-aerodynamic-structure comprehensive design, and structural anti-fatigue design.

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Cite this article:

QIAO Wei,YAO Weixing,MA Mingze. Numerical Simulation and Constitutive Models Evaluation of Residual Stresses and Process-induced Deformations of Composite Structures[J]. Materials Reports, 2019, 33(24): 4193-4198.

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http://www.mater-rep.com/EN/10.11896/cldb.18110061 OR http://www.mater-rep.com/EN/Y2019/V33/I24/4193

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