TY - SER AU - Hardy, S J AU - Pipelzadeh, M K AU - Gowhari-Anaraki, A R TI - Elastic and Elastic-Plastic Finite Element Analysis of Hollow Tubes with Axisymmetric Internal Projections Under Combined Axail and Pressure Loading KW - Finite - Element Analysis KW - Elastic-Plastic Behaviour KW - Hollow Tubes with Projections ER -