面向铺放工艺的预浸料剥离仿真与试验验证

为系统建立可表征刚度与黏性的预浸料剥离模型，构建探针、拉伸与剥离相结合的试验验证系统。首先，设计用于预浸料的移动悬臂剥离装置，完成各工艺参数下预浸料黏性和动态刚度的90°剥离试验测定，并建立剥离仿真模型；然后，通过探针试验获取黏性参数，采用内聚力模型定量表征黏性参数；接着，通过拉伸、压缩试验测定预浸料的正交各向异性力学参数，连同探针试验获得的黏性参数一同输入到剥离模型中，在各个工艺参数下黏性和刚度的仿真结果与试验值吻合程度良好；由于仿真与试验揭示剥离脱辊现象会影响剥离力测定值，因此研究脱辊现象及其机理，发现将导辊半径设计在3~7 mm内，可减弱脱辊程度、提高剥离试验的准确性。为系统测定并表征预浸料黏性及刚度、预浸料建模、开展自动铺放仿真等提供了参考。

Peel simulating and test verification of prepreg based on laying process

To systematically establish the prepreg peeling model which can characterize the stiffness and tack of the prepreg, a test verification system considering tensile, probe and peeling is constructed. First, the shift cantilever peel device for the prepreg is designed, and the tack and dynamic stiffness of the prepreg with various laying process parameters by the 90° peeling test are measured. A peel simulation model is established. Then, the cohesive zone model is used to quantitatively characterize the tack parameters obtained by the probe test. Next, the orthotropic mechanical parameters of the prepreg are measured by the test, and are input into the peeling model together with the tack parameters obtained from the probe test. Results of simulation of the tack and the stiffness of the prepreg with various process parameters are all in good agreement with the experimental values. The simulation reveals that the phenomenon of off-roller during the peel test will affect the measured value of peeling force; therefore, the phenomenon of off-roller and its mechanism are studied. It was found that the radius of the peel guide roller should be set within 3-7 mm, which can reduce the off-roller degree and improve the accuracy of the peel test. Our research completed systematic determination and characterization of the tack and stiffness of the prepreg, providing some reference for modelling and automatic placement simulation of the prepreg.