In order to analyze fatigue life of reinforced cylindrical shells, it is necessary to calculate stress and strain fields of the structure. The cost of three dimensional stress analysis of this structure is very high with respect to its geometric complexity. So the stress analysis of the problem is performed by shell-to-solid sub-modeling technique. For this purpose, the reinforced cylindrical shell is modeled using shell elements at first, which in this case all the bolts, rivets and spot welds are considered as bushing elements. Afterwards the candidate critical zones are modeled using 3D solid elements with the help of shell-to-solid sub-modeling technique and all the connections are also modeled using 3D elements. Then the fatigue life of the problem under multi-axial loading is estimated by Brown-Miller criterion. For this purpose a special script in ABAQUS software has been used.

Keywords: Reinforced cylindrical shells, Shell-to-Solid Sub-modeling, Multi-axial Fatigue, Brown-Miller Criterion

Full-Text [PDF 16615 kb]   (6443 Downloads)