Experimental research and finite element analysis were carried out to study the phenomenon of axial shortening and buckling instability of carbon fiber fully wound composite gas cylinders with titanium alloy thin-wall liners after hydraulic test.The results show that,after self-tightening and unloading,the area near the po-lar hole of the head will be concave axially,the area near the equator of the head will expand radially,and the whole head will become shorter axially.The axial shortening of the head will be 6.15 mm and 6.363 mm,re-spectively,and the error of the finite element calculation will be 3.46％.The finite element simulation results are in good agreement with the experimental results.Finally,the multi-pole hole method was used to optimize the thickness distribution of the fiber layer of the head,and the extreme thickness of the head was reduced by 32.6％,and the transition was made smoother.After the optimization,the gas cylinder will be slightly extended along the axis,with an average elongation of 0.6 mm.By CT and endoscope detections,no buckling instability would appear in the liner,which means an effective solution of the problems of axial shortening and liner buckling af-ter hydraulic tests.
关键词
复合材料气瓶/薄壁内胆/钛合金/残余变形/屈曲
Key words
composite gas cylinder/thin-walled liner/titanium alloy/residual deformation/buckling
维普
万方数据