薄壁钢管无芯弯曲最小相对弯曲半径的确定

Establishment of minimum relative bending radius of thin-walled tube no-mandrel bending

分析了钢管弯曲应力和应变,探索了最小相对弯曲半径与管的弯曲切向主应变的关系,并确定了最小相对弯曲半径的计算方法,进一步推导出分别按照材料硬化指数、延伸率和变形几何条件计算的最小相对弯曲半径公式,再通过薄壁钢管无芯弯曲试验对其进行修正。用此方法可在少量的钢管弯曲试验的基础上,精确地确定钢管弯曲的实际最小相对弯曲半径,具有较高的参考价值。

The steel tube bending stress and strain were briefly analyzed,the relationship between the minimum relative bending radius and the tube bending tangential strains was explored,the calculation method of the minimum relative bending radius was determined,and then the calculated minimum relative bending radius formulas according to the material hardening exponent,elongation and deformation of the geometric condition were deduced respectively.It was modified further through the steel tube bending tests.This method can precisely determine the actual minimum relative bending radius based on the small amount of steel tube bending tests,which has a strong reference value.