Deformation And Dynamic Response Of Steel Belt Staggered Multi-Layer Cylindrical Shell Under External Blast Loading

The deformation and dynamic response of multi-layer cylindrical composed of an inner shell and fourteen outer layers under external blast loads of different TNT equivalency weights were studied. A numerical model using thermo-viscoplastic constitutive model and considering fluid-structure coupling between explosion wave and structure was developed. The displacement in axial direction and cross-section as well as the effective strain responses were analyzed to demonstrate the potential deformation of shell structure. Results demonstrate that different materials cause inconsistent displacement and separation to develop in inner and outer shell. In order to address the problem that the displacement of inner shell is hard to measure due to the shielding and covering of outer shell, a theoretical formula for calculating the maximum displacement of inner shell was developed. The deflection process and stress triaxiality histories of inner shell were investigated, and the results showed that compressive stress is the primary cause of plastic deformation. Additionally, the delamination that appeared in the outer shell was discussed, and it was revealed that there are two factors of delamination: 1) Stress wave spread across adjacent layers in the opposite way because steel belts were wound in the opposite direction between the two adjacent layers;2) Outer layers experienced uneven compressive loads. The results will be helpful to provide a reference for the intrinsic safety design of such multi-layer cylindrical structures for hydrogen storage, etc…