论文部分内容阅读
UOE钢管成型应变和防腐涂层加热时的应变时效造成管线钢管的塑性具有各向异性,并且钢管纵向和周向的加工硬化系数不同。但是,塑性各向异性对于钢管工艺性能的影响目前尚未有明确的定论。采用两个能够分别代表塑性滞后和正交各向异性的不同屈服函数,建立了UOE钢管成型和弯曲的数学仿真模型。研究表明,成型模型引入了与材料强度和装备设计指标相对应的操作方案可以弥补下压能力的欠缺;弯曲模型说明应力-应变曲线上屈服点的伸长降低了钢管周向与纵向的屈曲极限,其降低程度取决于钢管的规格和内压。
UOE steel tube forming strain and anti-corrosion coating heating strain caused by the aging of the plasticity of the pipeline steel with anisotropy, and the longitudinal and circumferential tube work hardening coefficient is different. However, the plastic anisotropy of the performance of steel pipe technology has not yet been clearly determined. Using two different yield functions, which represent plastic lag and orthogonal anisotropy respectively, a mathematical simulation model of UOE steel tube forming and bending is established. The research shows that the introduction of the operation model corresponding to the material strength and equipment design index can make up for the lack of pressing ability. The bending model shows that the elongation of the yield point on the stress-strain curve reduces the buckling limit in the circumferential and longitudinal directions , The degree of reduction depends on the specifications of the steel pipe and the internal pressure.