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论文类型：期刊论文

发表时间：2022-06-30

发表刊物：光学精密工程

所属单位：运载工程与力学学部

卷号：26

期号：4

页面范围：884-893

ISSN号：1004-924X

摘要：For the bistable structures formed through compressing the strait beams into post-buckling modes,their bistable characteristics such as snap-through/maintain forces and snap-through distance are deeply related to the pre-stress distribution and the buckling mode.T hus,it is difficult to achieve a required specific bistable characteristic through only adjusting the pre-stress load.For this reason, one effective method was proposed for adjusting the critical buckling load and snap-through character-istics by introducing local reinforcements to regulate stress distribution during the snap-through proce-dure.Then,the snap-through analyzing model was established for the pre-compression bistable beam with symmetrical local reinforcements.Influences of the pre-stress,reinforcement size parameters and their position on buckling critical load,snap-through force and the stroke were analyzed.The results show that the characteristic of equal snapping and maintaining force is not affected by added local rein-forcements;compared with size parameters of the reinforcement,its position parameter plays a more important role in determining the snapping force,and the snapping force increases firstly and then de-creases with the position changed.The snapping force can be regulated up to 17.04% without chan-ging the stroke;the stroke is deeply related with the reinforcement stiffness and the pre-stress.

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