基于Tsai-Hill理论环氧玻璃钢管的强度分析

The strength analysis of epoxy glass fiber reinforced plastic tube based on the theory of Tsai-Hill

目前是按照工程经验对环氧玻璃钢管支撑结构进行设计,缺乏系统的理论研究。为了能有效地评估环氧玻璃钢管支撑结构的安全性,进而合理对其进行设计校核,本文首先依照纤维增强塑料性能的测试方法,对环氧玻璃钢材料进行低温力学性能测试试验;然后以应变强化型移动式真空绝热容器为研究对象,针对不同工况的运输环境,采用非线性有限元分析方法对该容器进行数值模拟,利用Tsai-Hill强度理论对环氧玻璃钢管结构进行强度校核。试验结果表明,环氧玻璃钢材料在低温环境下具有较好的拉压性能,但是抗剪切性能较差。模拟研究结果表明,低温液体运输车在实际运输过程中遭遇颠簸的路况时,相比于其他工况,此工况下支撑结构区域的Mises等效应力最大,但小于材料的许用应力;不同工况下固定端下支撑处的环氧玻璃钢管支撑结构相比于其他位置处所受的应力较大;环氧玻璃钢管作为该类容器的主要支撑构件,不同工况下其强度校核值远小于1,能够保证容器的安全运输。

Epoxy glass fiber reinforced plastic（Epoxy-GFRP） tube was designed in accordance with the engineering experience currently,but it was lacking of systematic study.In order to effectively evaluate the safety of Epoxy-GFRP tube support structure and to design and check it reasonably,the numerical simulation and experimental research was carried out in this paper.At first,low temperature mechanical properties test of Epoxy-GFRP material was carried out according to the test methods of GFRP properties.Then the vessel was simulated by using nonlinear finite element method,taking the strain-strengthening transportable vacuum insulated vessel as research object and considering the different transportation environment.Epoxy-GFRP tube was checked by using the Tsai-Hill strength theory.Experimental results showed that Epoxy-GFRP material has good compressive properties in low temperature environment,but low shear resistance.The simulation results showed that Mises equivalent stress of support structure was larger than that of other conditions when low temperature liquid tanker suffers bumper-to-bumper traffic conditions in the process of actual transportation.The Mises equivalent stress of Epoxy-GFRP tube near the fixed end support in the lower vessel was largerthan that of other locations under different conditions.As the strain-strengthening transportable vacuum insulated vessel＇s main support structure, Epoxy-GFRP tube conforms to the requirements of transportation safety that its intensity checking value is far less than one under different conditions.