Abstract:
The hydrostatic tests for the
Ф1
50 mm composite-wound cases with unequal poler openings were carried out. In order to precisely predict the failure modes, burst position and the burst pressure of the composite cases, the progressive damage model based on the 3D Hashin failure criteria was established and its reliability was evaluated by experimental results. Based on the finite element model, the sectionalization-based reinforcement optimization model through multi-island genetic algorithm was established to optimize the reinforcing layers and angles according to the stress distribution on domes. The influence mechanism of the reinforcing angles in different subareas and its coupling effect on the fiber stress were revealed and then the optimal reinforcing angles and layers were obtained. In addition, the subareaalization-based reinforcement test was implemented to validate the optimization model. The results of the numerical model show that the reinforcing angle from the equator of the dome to the shoulder of the metal boss has a more significant effect on the fiber stress and the relative small angle should be employed to reinforce domes; however, the relative large reinforcing angle in the subarea ranging from the poler openings to the shoulder of the boss should be applied to reinforce the axial and circumferential directions. The results of hydraulic burst test of the reinforcing case show that the burst pressure and the performance factor increase by 37.5% and 16.6%, respectively, compared with that of composite case without reinforcement, which indicates that the optimization model is accurate and reliable.
下载: