论文部分内容阅读
包钢白云鄂博铁精矿矿浆管道工程采用直径为355.6×15.5mm的X65级无缝钢管,为了获得壁厚误差对承载能力的影响规律,基于俞茂宏统一强度理论,利用解析方法计算管道的弹性极限解和塑性极限解,并进一步分析材料强度参数和拉压比对管道极限承载力的影响,以及塑性极限和弹性极限之间的裕度。结果表明:解析解中包含壁厚与外径的平方比,能够更准确地反映壁厚和外径对弹性极限承载能力的影响;管道的弹性极限承载能力满足设计压力16MPa和试验压力28.2MPa的要求,最小壁厚14.3mm满足安全要求;提高钢管的韧性,可以改善管道的承载能力;管道从弹性极限到塑性极限仅有约8%的裕度。充分考虑钢管壁厚误差,以弹性极限作为设计准则的管道更加安全可靠。
In order to obtain the law of the influence of wall thickness error on the bearing capacity, an X65-grade seamless steel pipe with a diameter of 355.6 × 15.5mm is adopted in the slurry pipeline project of Baiyunebo Iron Concentrate in Baotou Steel. Based on the unified strength theory of Yu Maohong, the elasticity of the pipeline is calculated by analytical method Limit solution and plastic limit solution, and further analyze the influence of material strength parameters and tension-compression ratio on the ultimate bearing capacity of pipeline, and the margin between plastic limit and elastic limit. The results show that the analytic solution includes the square ratio of wall thickness to outside diameter, which can more accurately reflect the influence of wall thickness and outside diameter on the ultimate bearing capacity. The ultimate bearing capacity of the pipe meets the designed pressure of 16 MPa and the test pressure of 28.2 MPa Requirements, the minimum wall thickness of 14.3mm meet the safety requirements; improve the toughness of steel pipe can improve the carrying capacity of pipelines; pipe from the elastic limit to the plastic limit of only about 8% margin. Full account of the wall thickness error, the elastic limit as the design criteria of the pipeline more secure.