LINEARIZED JOINT DAMPING MODEL FOR ASSEMBLED STRUCTURES WITH INHOMOGENEOUS CONTACT PRESSURE USING THIN-LAYER ELEMENTS
LINEARIZED JOINT DAMPING MODEL FOR ASSEMBLED STRUCTURES WITH INHOMOGENEOUS CONTACT PRESSURE USING THIN-LAYER ELEMENTS
复制标题
使用薄层单元的非均匀接触压力装配结构的线性联合阻尼模型
DOI：
--
复制
发表时间：
2015
期刊：
影响因子：
--
通讯作者：
L. Gaul
中科院分区：
文献类型：
--
作者：
M. Clappier;C. Ehrlich;L. Gaul
机械界面处的接头阻尼对组合结构的阻尼性能有很大影响。因此，数值模型必须描述这些耗散效应，以便在进行结构动力学仿真时获得足够的振动响应精度。具有所谓的薄层单元（TLE）的有限元模型可以有效地应用于对关节阻尼进行建模。将具有线性正交各向异性材料模型的reby，TLE放置在所有机械界面上。这些元素的刚度和阻尼参数是通过实验确定的通用搭接接头。在这种方法中，所有TLE包含相同的阻尼和刚度参数。然而，组装结构中的法向和切向载荷通常在界面区域上变化。由于关节阻尼取决于法向和切向载荷等因素，TLE的统一参数化无法准确描述这些条件，限制了原始方法的适用性。本文提出了一种改进的薄层单元有限元法，用于非均匀接触压力分布结构的建模。基于实验数据，推导出一个经验模型，以允许考虑施加的法向和切向载荷下改进的关节阻尼预测。这有助于每个单独的薄层单元的负载相关参数化，从而导致非线性接头行为的更精细的线性化。该方法被应用到一个测试结构，并与原来的方法相比。所有的模拟实验验证。
Damping properties of assembled structures are largely infl uenced by joint damping at mechanical interfaces. Therefore, numerical models must depict these dissipative effects in order to attain sufficient accuracy for vibration respons es when structural dynamic simulations are carried out. Finite element models with so-called thin-layer elements (TLEs) can be efficiently applied to model joint damping. The reby, TLEs with a linear orthotropic material model are placed on all mechanical interfaces. Stiffness and damping parameters for these elements are experimentally determined on a generic lap joint. In this approach, all TLEs contain identical damping and stiffness parameters. However, normal and tangential loads in assembled structures typically vary over the interface area. As joint damping depends, among other factors, on normal and tangential loads, a uniform parametrization of the TLEs cannot depict these conditions accurately, limiting the applicability of the original approach. In this paper an imp roved finite element modeling approach for structures with inhomogeneous contact pressure distributions using thin-layer elements is presented. Based on experimental data, an empirical model is derived to allow improved joint damping prediction under consideration of applied normal and tangential loads. This facilitates a load-dependent pa rametrization of each individual thin-layer element, resulting in a finer linearization o f the nonlinear joint behavior. This method is applied to a test structure and compared to the original approach. All simulations are verified experimentally.