IMPACT ANALYSIS OF AN AIRCRAFT-APSSDC

RESEARCH PROBLEM Safety assessment of nuclear power plants subjected to aircraft impact has become a research focus since September 11 attacks. Containment capacities to withstand aircraft loading were widely studied.  An aircraft crashing into a nuclear containment may include series of disasters related to containment capacity including local penetration, perforation of containment, intensive vibrations and fire ignited after jet fuel leakage. Nuclear containment must be constructed and operated to prevent leakage of radiation into the surroundings .The direct hit of an aircraft may lead to local or global failure of nuclear containment. It is almost impossible to study its response through experiments and investigation on response is very complex. PROBLEM SOLUTION The solution for this problem is to analyze the impact caused due to aircraft crash using modern techniques. Here in this project BOEING 747 impact analysis on nuclear containment building is done using ABAQUS. Two types of material model for concrete containment building were used. CDP(concrete damaged plasticity) and BRITTLE CRACKING were introduced and results of both models were compared. Mass distribution of projectile structure is one of the big factors in impact analysis. So, mass distribution of finite elements (FE) model is maintained similar to real structure. Main structural materials of BOEING 747 is aluminum alloy. Linear plastic material model was used for aircraft structure shell with ductile failure model. The nuclear containment building has three parts   1) Inner shield shell 2) Reinforcement steel bars 3) Concrete containment building Material behavior of concrete was employed using concrete damaged plasticity model based on the concept of isotropic damaged elasticity in conjunction with isotropic tensile/compressive plasticity where yield stresses, inelastic plastic strains, cracking strain, fracture energy etc., are analyzed. CONCLUSION The local as well as global deformation of containment was measured and damage parameters including tension and compression were evaluated at each impact location against each aircraft crash. It was concluded that maximum deformation of containment depend on stiffness of strike location. Response of nuclear containment using ABAQUS is well studied for BOEING 747. The center of cylinder portion was found to be most critical impact location at which containment experienced the largest damaged area.