Papers by Author: Li Liang

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.

Abstract: Dynamic properties of Nanostructured Metal Matrix Composites (NMMCs) materials consisting of nanograined aluminum matrix with nano or micro-sized ceramics particulates are calculated using Ansys/LS-DYNA in this paper. There are three conditions for the mechanics analysis involved the target with 10 vol. % SiC, 30 vol. % SiC and 50 vol. % SiC. It is assumed that the SiC particles uniformly distributed in the matrix. According to the analysis, the strength of NMMCs material is reduced, and the deformation of target is weakened by the vol. % of SiC increasing.