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由于复合材料增强管线钢管钢层和复合材料层的模量差异,钢层承担了大部分的载荷,复合材料的增强作用发挥不充分。为了保证管道完整性、重新分配结构层间载荷比例、增加复合材料利用率,通过对水压爆破试验测试结果与有限元模型的分析,得出了复合材料增强管线钢管的失效压力及设计压力计算方法,并对预应力和结构层厚度的设计提出了设计要求:在预应力处理复合材料增强管线钢管时,增强层的应力不能超过复合材料断裂强度的40%,钢层的应力应该小于钢材的最小拉伸强度;在设计压力下,复合材料层的厚度应该保证应力低于其断裂强度的30%,钢层的厚度应保证应力低于钢材的屈服强度。研究结果为复合材料增强管线钢管的设计提供了依据。
As the composite material increases the modulus difference between the steel pipe layer and the composite layer of the pipeline, the steel layer takes up most of the load, and the reinforcing effect of the composite material is not sufficiently exerted. In order to ensure the integrity of pipeline, redistribute the proportion of load between structural layers and increase the utilization ratio of composite materials, the failure pressure and design pressure of composite reinforced steel pipe are obtained through the test results of hydraulic burst test and finite element analysis The design requirements of the prestressed and structural layer thickness design are as follows: When the prestressed composite pipe is strengthened, the stress of the reinforced layer can not exceed 40% of the fracture strength of the composite, the stress of the steel layer should be less than that of the steel Minimum tensile strength; under the design pressure, the composite layer thickness should ensure that the stress is less than 30% of its breaking strength, the thickness of the steel layer should ensure that the stress is lower than the yield strength of steel. The results provide the basis for the design of composite pipelines to enhance the pipeline.