In this paper, glass fiber reinforced polymer (GFRP) materials were used to repair cracked Al plates. In order to study the influences of resin properties and repair configurations, three resins and two patch configurations were selected to manufacture six groups of specimens. It turned out that only little differences (less than 3%) were found in tensile strength among the six groups. Compared with the parent plates, the strength recovery ratio was higher than 80% after the GFRP repair, representing excellent repair efficiency. Moreover, a finite element model (FEM) was established to analyze the failure process of the repaired structure under tensile loading. The FEM results show good agreement with the experimental results, indicating good precision. Both the experimental and numerical work found that the damage initiated in the plies adjacent to the crack surface and the failure modes was mainly delamination and fiber breakage. This work will be meaningful for the future application of GFRP in metallic structures.

The shell of scroll compressor was subjected to internal gas pressure during operation. In order to ensure the safety of the pressure shell, the structure parameters of the shell were determined initially by pressure vessel design method, and the strength of the shell was checked by finite element method. Because of the uncertainty of structural parameters, the reliability of the shell of scroll compressor was analyzed by finite element method and probability design system (PDS), and the reliability and probabilistic sensitivity of the shell were obtained. The results showed that the material's strength, working pressure, thickness of head wall, thickness of cylinder wall, radius of cylinder and radius of head were the main factors to affect the reliability of the shell, and the reliability design method was better economic than the conventional design method. The above conclusions provide a scientific basis for the further optimal design of scroll compressor's shell.