buckling analysis of fml cylindrical shells under combined axial and torsional loading

Generally, inserved cylindrical shells buckling usually takes place not merely under one of the basic loads, i.e., axial compression, lateral pressure, and torsion, but under a combination of them. the buckling behavior of fibermetal laminate (fml) cylindrical shells under combined axial and torsional loading is studied in this paper. the kirchhoff lovetype assumption is employed to study the axial buckling load. then, an extended finite element (fe) model is presented and results are compared. a number of consequential parameters such as layup arrangement, metal type and metal volume fraction are employed and enhancement of buckling behavior of the shell is also studied. finally, the interaction of axial /torsional loading is analyzed and discussed. the results show that as the metal volume fraction rises to 15%, the endurable buckling load increases almost 43% more than the state in which there is no metal layer. the numerical results show that increasing the metal volume percentage leads to a decrease in buckling performance of the structure under axial loading.