Analysis of Optimal Autofrettage Pressure on CFRP Pressure Vessels Using ANSYS

Abstract

For the pressure vessels made of high-strength Carbon Fiber Reinforced Plastics (CFRP) and Aluminum liner, the strength is provided by the CFRP, but the liner leak is always the bottleneck of the vessels’ safety. The carrying capacity and anti-fatigue ability of CFRP pressure vessels is largely depend on the elastic deformation range. In this research the principle of autofrettage is analyzed, the mechanical character of a certain 2 liters pressure vessel is analyzed using finite element software ANSYS, and the optimal autofrettage pressure is calculated by optimization method. The results showed that the stresses of the liner under working pressure were decreasing while applying the autofrettage pressure. The liner would gain the best plastic level under the appropriate autofrettage pressure.

A Study on Analytically and Numerically Analysis of a Cylindirical Component Using Autofrettage

“…There are lots of publications in the literature that include analytical, numerical and experimental analysis focusing on issues such as the strength of the part to which it is applied, crack formation and fatigue life of the part, and optimization related to hydraulic autofretage [29][30][31][32][33][34][35][36].…”

Fatigue analysis of high-pressure hydrogen storage vessel based on optimum autofrettage pressure

“…Thumper et al 8 analyzed the residual stress field and fatigue life after autofrettage by using the finite element method and pointed out that the autofrettage process can improve the fatigue limit of materials. Liu et al 9 studied the principle of autofrettage of composite containers and used an optimization algorithm to get the best autofrettage pressure for composite vessels, pointing out that applying the best autofrettage pressure can improve the stress distribution. Diaz et al 10 pointed out the influence of autofrettage pressure on hydrogen diffusion through modeling and stress analysis and pointed out that the response surface method is a way to determine the autofrettage pressure of vessels.…”