Abstract: The accuracy of stress caculation results of geometric equlivalent method of different sections are analyzed by adopting the fininte numerical simulation method the support of ABAQUS software.So,the advantages and disadvantages,scope of application and the improvement direction of stress caculation by using the geometric equlivalent are proposed.The research resuls show that,the stress caculation of noncircular cross section is converted to caculating the stress of circular cross by the geometric equlivalent method.On the whole,the principle of the algorithm is simple,and it is no difficult to adopt the algorithm to solve the practical problems.

Key words: Noncircular cross section, Geometric equlivalent method, Numerical simulation