Research on buckling load design method of spherical shells under external pressure based on local probing method
Considering that the imperfection sensitivity of spherical vessels under external pressure is inevitable,the buckling design of spherical vessels has always been a topic worthy of attention.Therefore,the buckling design of imperfection sensitive spherical shell structures under external pressure based on local probing method was systematically studied.According to the detection results,three buckling load design methods were proposed,which are the energy barrier method,the maximum curvature method and the equivalent imperfection method.On the basis of considering the nonlinear effect of materials,three methods of buckling load design were introduced in detail,and the proposed design methods were compared and verified by the buckling response of spherical shells with different geometric imperfections.The results show that,compared with the current standards,the proposed methods can provide fine buckling load design results for specific spherical shell structures under the promise of considering the imperfection sensitivity.Three specific structures were used to verify the proposed methods,and the lowest experimental knockdown factors of each structure were 0.390,0.224,0.290,respectively.The maximum design knockdown factors of each structure calculated by the design methods proposed herein are 0.315,0.213,0.171 respectively,which are all lower than the experimental values,reflecting the reliability of the design methods proposed herein.
spherical shells under external pressurebuckling designimperfection sensitivitylocal probing
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