PVC异形截面梁弯曲试验和数值模拟

PVC Bending Test and Numerical Simulation of Special-shaped Section Beams

为了研究聚氯乙烯(PVC)材料作为梁构件的抗弯性能,首先对PVC材料进行拉伸试验获得基本的本构参数,接着对一种异形截面的PVC空心梁管采用四点弯曲的加载方式,分析梁试件的破坏形式、跨中荷载-挠度变化、截面应变变化,并通过有限元软件ABAQUS进行模拟验证。结果表明,异形截面梁发生塑性破坏,荷载-挠度曲线分为线弹性阶段、塑性阶段、破坏阶段,其中梁跨中截面最大拉应变为3.561×10^(-3),最大压应变为3.38×10^(-3),符合平截面假定,且有限元数值模拟效果较好,极限荷载与试验值误差在5%以内。此结果为PVC单构件进一步的力学性能研究提供了基础。

In order to study the flexural performance of polyvinyl chloride(PVC)material as a beam member, the basic constitutive parameters of PVC material were obtained by tensile test.Then, a four-point bending loading method was used for a PVC hollow beam tube with a special-shaped section.The failure mode, mid-span load-deflection change and section strain change of the beam specimen were analyzed, and the finite element software ABAQUS was used for simulation verification.The results show that the plastic failure of the beam with special-shaped section occurs, and the load-deflection curve is divided into linear elastic stage, plastic stage and failure stage.The maximum tensile strain of the mid-span section of the beam is 3.561 × 10^(-3),and the maximum compressive strain is 3.38×10^(-3)which conforms to the plane section assumption.The finite element numerical simulation effect is good, and the error between the ultimate load and the experimental value is within 5%.The results provide a basis for further study on mechanical properties of PVC single component.