SHEAR BUCKLING FORM OF A CIRCULAR SANDWICH RING UNDER UNIFORM EXTERNAL PRESSURE

摘要

The problem on the stability of a circular sandwich ring under uniform external pressure is considered. It is shown that, along with a mixed flexural-shear buckling form (B F), BF cannot be realized in the core. This form is accompanied by rotation of a load-carrying layer at the cost of the transverse shear strain (constant in the circumferential direction) in the core. It is found that simplified equations of the theory of shallow shells cannot describe this nonclassical BF. The critical loads, corresponding to this shear BF may prove to be smaller than the critical load of the classical mixed flexural BF for a three-layered circle ring of medium thickness at a low shear modulus of the core. The results obtained contribute greatly to the understanding of buckling mechanisms of three-layered structures and supplements the existing classification of BFs.