Contact-coupled impact of slender rods: analysis and experimental validation.
Contact-coupled impact of slender rods: analysis and experimental validation.
复制标题
DOI：
10.1007/s11340-013-9778-6
复制
发表时间：
2014-02-01
影响因子：
2.4
通讯作者：
Brannon RM
中科院分区：
文献类型：
--
作者：
Tibbitts IB;Kakarla D;Siskey S;Ochoa JA;Ong KL;Brannon RM
为了验证低速结构碰撞中的接触力学模型，在落塔中对细长杆进行了碰撞，并将接触和振动的测量结果与分析和有限元（FE）模型进行了比较。使用一种新的薄膜转移技术记录的接触面积，并使用电气连续性测量的接触时间。应变计记录了一根杆的振动应变，激光多普勒振动计测量了速度。实验分析建模的一维空间域上使用的准静态赫兹接触法和延迟微分方程系统。三维有限元模型采用六面体单元、罚接触算法和显式时间积分。从初始整体FE模型中提取的一个小子模型经济地细化了小接触区域的分析。测量的接触面积在两个模型预测值的6%以内，峰值速度在2%以内，循环应变在12 μ s（RMS值）以内，接触持续时间在2 μs以内。全球FE模型和测量结果显示，小的干扰，而不是预测的分析模型，认为是由非平面应力波阵面与棒的两端的相互作用。这个简单的测试，以及诊断工具的多功能性的预测的准确性，验证了理论和计算模型，证实仪器校准，并建立信心，相同的方法可用于接触力学的实验和计算研究在更复杂的结构的影响。建议应用的方法，以一个特定的生物力学问题：边缘加载的一个松散的假体髋关节，这可能会导致过早磨损和假体失败。
To validate models of contact mechanics in low speed structural impact, slender rods were impacted in a drop tower, and measurements of the contact and vibration were compared to analytical and finite element (FE) models. The contact area was recorded using a novel thin-film transfer technique, and the contact duration was measured using electrical continuity. Strain gages recorded the vibratory strain in one rod, and a laser Doppler vibrometer measured speed. The experiment was modeled analytically on a one-dimensional spatial domain using a quasi-static Hertzian contact law and a system of delay differential equations. The three-dimensional FE model used hexahedral elements, a penalty contact algorithm, and explicit time integration. A small submodel taken from the initial global FE model economically refined the analysis in the small contact region. Measured contact areas were within 6% of both models’ predictions, peak speeds within 2%, cyclic strains within 12 με (RMS value), and contact durations within 2 μs. The global FE model and the measurements revealed small disturbances, not predicted by the analytical model, believed to be caused by interactions of the non-planar stress wavefront with the rod’s ends. The accuracy of the predictions for this simple test, as well as the versatility of the diagnostic tools, validates the theoretical and computational models, corroborates instrument calibration, and establishes confidence that the same methods may be used in experimental and computational study of contact mechanics during impact of more complicated structures. Recommendations are made for applying the methods to a particular biomechanical problem: the edge-loading of a loose prosthetic hip joint which can lead to premature wear and prosthesis failure.
登录
查看更多内容
影响因子：
1.6
作者：
Rajasekaran, R;Nowell, D
通讯作者：
Nowell, D
影响因子：
3.5
作者：
Walter, WL;Insley, GM;Tuke, MA
通讯作者：
Tuke, MA
DOI：
10.1302/0301-620x.92b3.23281
发表时间：
2010-03-01
影响因子：
--
作者：
Kwon, Y. -M.;Glyn-Jones, S.;Murray, D. W.
通讯作者：
Murray, D. W.
DOI：
10.1115/1.1789539
发表时间：
2004-09-01
影响因子：
1.7
作者：
Hu, B;Eberhard, P
通讯作者：
Eberhard, P
影响因子：
3.4
作者：
Seifried, R;Hu, B;Eberhard, P
通讯作者：
Eberhard, P