摘要
Investigation of paper cutting process is vital for the design of cutting tools,but the fracture mechanism of paper cutting is still unclear.Here,we focus on the cutting process of paper,including the key parameters of cohesive zone model(CZM)for the orthotropic paper,to simulate the shear fracture process.Firstly,the material constants of the orthotropic paper are determined by longitudinal and transverse tensile test.Secondly,based on the tensile stressstrain curves,combined with damage theory and numerical simulations,the key parameters of the CZM for the orthotropic paper are obtained.Finally,a model III fracture is simulated to verify the accuracy of the model.Results show that the load-displacement curves obtained by the simulation is consistent with the test results.
研究纸张裁剪过程对刀具设计至关重要,然而纸张裁剪的断裂机理却尚未明晰。为此,基于内聚区模型,对纸张的剪切过程进行仿真分析,并给出确定纸张剪切内聚区模型关键参数的方法。首先,通过纸张的纵向和横向拉伸试验,基于各向异性理论,确定纸张的材料常数。其次,基于拉伸应力-应变曲线,结合损伤理论和数值方法,给出纸张内聚区模型的关键参数:最大张力和内聚能。最后,对纸张的剪切试验进行仿真模拟,以验证模型的准确性。结果表明:静态断裂下,剪切试验的全局载荷-位移曲线与试验结果基本一致,验证了模型的可靠性。
基金
supported by the National Natural Science Foundation of China(No.11702147)。
