Abstract
Cylinder is one of the most commonly used components which has a risk of having circumferential cracks, especially in the welding zone. When cracks are discovered, it is necessary to perform the failure strength assessment of cracked cylinder and the limit load play an important part as the input of the assessment. At present, the limit load solution for circumferential cracked cylinder under combined bending and torsion can be estimated by using the methods of equivalent moment or biaxial failure parameter. However, these methods still have some limitations. The main aim of this paper is to propose the alternative method for predicting the failure moment of circumferential cracked cylinder under combined bending and torsion. The method used in this paper is based on the modification of biaxial failure parameter and the data from finite element analysis. Details of this method is presented in this paper.
Highlights
Cylinders used in power station, petroleum, steel and other industries may experience internal pressure, axial load, bending and torsion
The main aim of this paper is to provide the alternative method to predict the failure load for circumferential cracked cylinder under combined bending and torsion
For the case of cracked cylinder subjected to combined bending and torsion moments, Bezensek et al [5] showed that the collapse moment can be described as equivalent moments MM defined by; MM = MM + MM
Summary
Cylinders used in power station, petroleum, steel and other industries may experience internal pressure, axial load, bending and torsion This makes cylinder at the risk of having circumferential cracks, especially in the welding zone. Many analytical and finite element (FE) solutions have been developed for predicting the plastic limit load of circumferential cracked cylinder [1,2,3,4]. These solutions are usually developed for Mode I type loading (opening mode) of internal pressure, axial tension and bending. The effects of Mode III type of torsion moment are not included in the solutions
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