Modeling the nonlinear deflection of elliptical-arc-fillet leaf springs
Modeling the nonlinear deflection of elliptical-arc-fillet leaf springs
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DOI：
10.1016/j.mechmachtheory.2022.105037
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发表时间：
2022-10
影响因子：
5.2
通讯作者：
Ruiqi Li;Zhi-guo Yang
中科院分区：
文献类型：
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作者：
Ruiqi Li;Zhi-guo Yang
板簧因其柔度分布特性，广泛应用于定位平台、柔性枢轴等大行程柔性机构中。然而，均匀的横截面拒绝了改善钢板弹簧的应力集中和中心偏移的可能性。为此，提出了一种广义模型，包含多种类型的钢板弹簧与大挠度应用的变截面。提出了一种基于梁约束模型的单元积分法，用于模拟椭圆弧圆角钢板弹簧（EAFLS）的非线性变形和中心偏移等非线性特性。具体参数的EAFLS性能比较表明，广义模型可以为机构设计提供一个全面的参数化方法，避免了经验选择。非线性有限元结果验证了所提出的非线性模型的准确性。所提出的模型的效率示出了一个指导机制的设计。
Leaf spring is widely used in many large-stroke compliant mechanisms, such as positioning stage and flexural pivot, for its distributed compliance. However, the uniform cross-section rejects the possibility of improving the stress concentration and center shift of leaf springs. To this end, a generalized model is proposed to contain multiple types of leaf springs with variable cross-sections for large deflection applications. An element integral method based on the beam constraint model (EIMBCM) is provided to model the nonlinear properties of elliptical-arc-fillet leaf springs (EAFLS), such as nonlinear deflection and center shift. Properties comparison of EAFLSs with specific parameters indicates that the generalized model can provide a comprehensive parametric method for mechanism design and avoid the empirical choice. The accuracy of the proposed nonlinear model is verified by nonlinear finite element results. The efficiency of the proposed model is illustrated by the design of a guiding mechanism.