玻璃钢-不锈钢衬里复合管道应力变形数值模拟

主要就内径为200mm玻璃钢-薄壁不锈钢衬里复合管道在工作载荷和过载条件下的应力变形情况进行了数值模拟。数值模拟的结果表明：在设计工作压力下管道是安全的，并且应力、应变和径向位移在玻璃钢壳层和不锈钢衬里的界面处是连续分布的，这保证了载荷在界面处的连续传递；当管道内部压力达到设计工作戢荷的2．2倍时，不锈钢衬里几乎达到全面屈服，但玻璃钢壳层中的应力还远远小于其断裂极限，管道仍然具有进一步承载能力；进一步加大载荷至7．4倍的设计压力，玻璃钢壳层达到断裂极限，管道破坏。计算结果与实验结果吻合良好，说明这种复合管道具有较高的承受过载的能力，管道的设计具有较大的安全系数。当内径200mm长度达6m充满水的复合管道在距端部1m处支撑时，管道的最大挠曲产生在管道的中部．最大挠度为0．3mm．这与实验结果也是一致的。

Numerical Simulation of Stress and Distortion for GFRP Compound Conduit with Stainless Steel Liner

Numerical simulation of stress and strain under working load and overload is conducted for a 200 mm interiorl diameter compound conduit of fiberglass-reinforced-plastics with stainless steel liner. The results show that the conduit is safe under design working pressure, and the stress, strain and radial displacement are of continuous distribution at interface of crust and stainless steel liner, which guarntees continuous transfer of load at the interface. When interior pressure of the conduit is 2.2 times of design working load, the stainless steel liner almost reaches complete yield. However, the stress of the fiberglass-reinforced-plastics crust is far less than breaklimit, remaining bearing capacity. The conduit can endure 7.4 times of working load before break, and this result fits well with that of the experiment, which indicates that the conduit has good ability to bear overload, and its design safety factor is larger. When support a 6 m length compound conduit is at 1 m from the conduit end,peak value of flexure distortion of the conduit is at the middle and a maximum flexibility is 0.3 mm, which also accords well with that of the experiment.