摘要
在万能材料试验机上对聚四氟乙烯（PTFE）复合材料进行不同温度及不同拉伸速率下的单轴拉伸性能测试，获得温度范围为253~333 K、拉伸速率范围为10~200 mm/min条件下的一系列拉伸应力-应变曲线，发现PTFE复合材料的拉伸性能对温度变化敏感，对拉伸速率变化不敏感。为了能定量描述PTFE复合材料的力学特性，同时也为有限元数值模拟提供材料模型，根据拉伸试验结果，建立了PTFE复合材料单轴拉伸本构模型，该本构模型以数学公式的形式较好地表达了PTFE复合材料应力-应变曲线随拉伸速率及温度的变化关系。最后，对PTFE复合材料板材进行了单向压缩实验，并利用ABAQUS软件，使用所建立的本构模型，对PTFE复合材料板材进行单向压缩的有限元分析，通过仿真结果与实际试验结果对比，验证了建立的本构模型的正确性，表明该本构模型具有一定的通用性。
The uniaxial tensile properties tests of PTFE composites were done using the universal material testing machine under different temperatures and tensile rates,a series of tensile stress-strain curves under temperatures ranging from 253 K to 333 K and tensile rates ranging from 10 mm/min to 200 mm/min were obtained for the PTFE composites. It is found that the tensile properties of PTFE composites are sensitive to the temperature change and not to the tensile rate change. In order to describe the mechanical properties of PTFE composites quantitatively and supply a material model for FEM simulation,based on the experimental results,a uniaxial tensile constitutive model was developed. The constitutive model can describe the stress-strain relationship under different temperatures and tensile rates quantitatively. At last,the uniaxial compression test of PTFE composite panel was done,then using ABAQUS and the constitutive model,A FEM ansysis for compression of PTFE composite panel was carried out. Compared with the data obtained from simulation and experiment,the constitutive model was verified,which indicates the constitutive model set up has good generality.
出处
《工程塑料应用》
CAS
CSCD
北大核心
2014年第2期74-77,共4页
Engineering Plastics Application
基金
国家863计划项目(2013AA031604)
关键词
聚四氟乙烯
拉伸应力-应变曲线
本构模型
polytetrafluoroethylene
tensile stress-strain curve
constitutive model
