模具表面状态对复合材料构件固化变形的影响

为查明不同模具表面状态下的复合材料构件应变演变规律及其对固化变形的影响,采用热电偶和光纤光栅传感器对不同模具表面状态下的复合材料构件在热压罐成型工艺过程中的温度和应变进行在线监测,获得不同模具表面状态下构件应变的变化规律。结果表明:升温阶段脱模布的使用能够有效屏蔽模具-构件界面相互作用,使构件在升温阶段的应变很小。三层脱模剂模具表面条件下构件中的应变明显小于一层脱模剂;降温阶段三种实验条件下在构件中都出现了较大的压应变,其中一层脱模剂模具表面状态下模具-构件相互作用力最大,在固化工艺完成后构件发生翘曲变形,且翘曲变形以沿纤维方向为主。

Influence of Tool Surface Condition on Cure-Induced Deformation of Composite Structure

In order to find out the strain change law of the composite component under different surface conditions of the tools and their influence on the curing deformation, thermocouple and FBG sensors were used to monitor the temperature and strain of composite components, and the change law of component strain under different tool surface conditions could be obtained.The results show that the use of demoulding cloth can effectively weaken the interface interaction between tool and component, so that the strain of component is very small in the heating stage.And the strain of component with the tool surface condition of three-layer demoulding agent is obviously less than that of one-layer demoulding agent.In the cooling stage,large compressive strain of composites is detected in all three surface conditions.The tool-part interaction force is the largest when there is one layer of releases agent,and the main warping deformation are along the fiber direction after the curing process.