考虑模具和黏弹性的复合材料固化变形数值模型

复合材料科学与工程 ›› 2020, Vol. 0 ›› Issue (10): 67-74.

考虑模具和黏弹性的复合材料固化变形数值模型

乔巍¹, 姚卫星^1,2*, 黄杰¹

1.南京航空航天大学飞行器先进设计技术国防重点学科实验室,南京210016;
2.南京航空航天大学机械结构力学及控制国家重点实验室,南京210016

收稿日期:2020-05-12 出版日期:2020-10-28 发布日期:2020-10-28
通讯作者: 姚卫星(1957-),男,博士后,教授,博导,主要从事复合材料的结构制造-工艺一体化设计、飞行器的总体-气动-结构的综合设计技术、结构抗疲劳设计等方面的研究,wxyao@nuaa.edu.cn。
作者简介:乔巍(1983-),男,博士研究生,研究方向为复合材料结构固化变形仿真及控制。
基金资助:
江苏高校优势学科建设工程资助项目

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

QIAO Wei¹, YAO Wei-xing^1,2*, HUANG Jie¹

1. Key Laboratory of Fundamental Science for National Defense-Advanced Design Technology of Flight Vehicle, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China;
2. State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China

Received:2020-05-12 Online:2020-10-28 Published:2020-10-28

摘要/Abstract

摘要： 考虑了模具作用和材料的黏弹性,建立了复合材料构件残余应力和固化变形的三维数值模型。在模具与复合材料构件间引入界面剪应力,模拟升温过程中模具-构件的相互作用。分析了固化过程中温度和固化度对材料力学性能的影响,分别采用线弹性和黏弹性本构方程描述凝胶前后材料的应力-应变关系。采用热-力顺序耦合分析方法,在ABAQUS软件中建立了模拟复合材料固化过程的有限元模型,分析了固化过程中温度场、固化度场、残余应力及变形。最后,通过与试验结果的对比,验证了所建数值模型的合理性和准确性。结果表明,固化过程中单向板和非对称层合板内产生的残余应力在厚度方向上呈非对称分布,这是脱模后层合板变形的根本原因。

关键词: 复合材料, 固化变形, 残余应力, 模具-构件相互作用, 材料的黏弹性

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

中图分类号:

TB332

乔巍, 姚卫星, 黄杰. 考虑模具和黏弹性的复合材料固化变形数值模型[J]. 复合材料科学与工程, 2020, 0(10): 67-74.

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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