钢丝缠绕增强塑料复合管非线性短时力学性能研究

Research on Short-term Nonlinear Mechanical Properties of Plastic Pipe Reinforced by Cross Helically Wound Steel Wires

钢丝缠绕增强塑料复合管(简称PSP)是通过高强钢丝与高密度聚乙烯(HDPE)复合成型的复合管。传统的PSP力学性能分析模型将钢丝、HDPE看作线弹性材料,其复合结构看作各向异性层合板进行分析。当原材料非线性性能较显著时,线弹性分析可能会引起较大误差。为此依据PSP管材细观特征,以钢塑分离模式建立全钢丝缠绕结构PSP模型,考虑钢丝与HDPE的非线性力学性能,以钢丝应力作为失效判据,计算分析得到PSP管的短时爆破压力。开展PSP短时爆破试验研究,试验结果用于模型验证。结果表明:非线性模型计算结果与试验结果吻合良好。

A plastic pipe reinforced by cross helically wound steel wires ( PSP) is composed of high-strength steel wire and high density polyethylene ( HDPE). In traditional mechanical analysis model, steel wires and HDPE are considered as linear elastic materials, and the composite structure is simplified to orthotropic laminated plates, but linear elastic analysis may result in relatively large error when the nonlinear performance of PSP is eminent. Therefore, a new finite element model of PSP was established with separately modeling steel wires and HDPE, and the nonlinear properties of constituents were taken into account. In the PSP failure analysis process, the maximum stress failure criterion was utilized. Groups of short-term burst tests of PSP were carried out to validate the proposed model. The results show that the calculated results of the nonlinear model agree well with the experimental results.