A novel design method of bistable structures with required snap-through properties
A novel design method of bistable structures with required snap-through properties
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一种具有所需突跳特性的双稳态结构的新颖设计方法
DOI：
10.1016/j.sna.2017.12.019
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发表时间：
2018
期刊：
影响因子：
--
通讯作者：
Shutian Liu
中科院分区：
文献类型：
--
作者：
Renjing Gao;Mingli Li;Qi Wang;Jian Zhao;Shutian Liu
为了简化预压缩双稳态结构复杂计算和重复测试的设计过程，提出了一种快速设计具有所需突弹特性的双稳态结构的新方法。双稳态结构是局部加固的预压拱形梁，通过将相应的直梁轴向压缩至屈曲后状态而形成。通过调整局部钢筋的位置和尺寸以及梁的压缩长度等控制参数，可以很好地控制屈曲后的形状、惯性应力状态以及所需的折断性能，如折断力、维持力和折断距离。基于有限元方法，对突跳特性与控制参数之间的关系进行了数值分析。此外，描述了突弹特性随控制参数变化的模型谱。通过遍历模型谱，可以获得实现所需双稳态特性的所有设计方案，这大大扩大了预压缩双稳态结构的设计领域。提供了一个设计示例来说明设计具有所需突跳特性的双稳态结构的方法的实用性。同时，考虑了所设计的双稳态结构的可制造性。实验结果表明，测量的突跳特性与设计目标非常吻合，充分验证了所提出设计方法的有效性。
To simplify the design process characterized by complex computation and repeated tests for pre-compressed bistable structures, a novel method is proposed for quickly designing bistable structures with required snap-through properties. The bistable structures are pre-compressed arch-shaped beams with local reinforcements, which are formed through axially compressing the corresponded straight beams into post-buckling states. The post-buckling shape, inertial stress state and the required snap-through properties such as the snapping force, the maintaining force and the snapping distance, can be well controlled by adjusting the control parameters including the position and dimensions of local reinforcements and the compressed length of the beam. Based on the finite element method, the relationship between the snap-through properties and the control parameters is numerically analyzed. Furthermore, the model spectrum describing the variation of snap-through properties with control parameters is delineated. By traversing the model spectrum, all design schemes can be obtained for achieving desired bistable properties, which greatly enlarges the design domain for pre-compressed bistable structures. A design example is provided to illustrate the utility of the method of designing a bistable structure with required snap-through properties. Meanwhile, the manufacturability of the designed bistable structure is taken into account. The experimental results show that the measured snap-through properties are in good agreement with the design objectives, which sufficiently validates the effectiveness of the proposed design method.