基于数值模型的金属橡胶干摩擦迟滞特性研究

以完全基于实际材料、工艺参数的数值模型为基础,对金属橡胶的干摩擦迟滞特性进行了研究。从成形压力曲线、材料组织结构、尺寸、加载-卸载曲线等四个方面对数值模型的可靠性进行了验证。建立了弹性微元模型及其局部坐标,对接触对数量、滑动接触对比例、接触对形态进行了研究。接触对数量随加载量的增加而增加,随卸载量的增加而减小,滑动接触对约占所有接触对数量的80%。将接触对分为典型接触对和非典型接触对,其中典型接触对占主要成分。根据接触对的细观特征,建立了接触对力学模型,进而建立了金属橡胶迟滞特性曲线的数学模型。数学模型准确性、可靠性较好、各参数物理意义充分,能够较好地对材料的干摩擦迟滞特性进行描述,对材料的设计具有一定指导意义。

Analysis of dry friction hysteresis characteristics of metal rubber with numerical model

Dry friction hysteresis characteristics of metal rubber was studied based on numerical model established absolutely with actual material and process parameters. The numerical model was verified in the four respects: forming force, tissue structure, size and loading-unloading curve. Elastic micro element and its local coordinates were built. Quantity of contact pairs, ratio of sliding contact pairs and status of contact pairs were researched. The number of contact pairs increases with loading and decrease with unloading. Sliding contact pairs account for nearly 80 percent of all contact pairs. The contact pairs were divided in two kinds: typical contact pairs and untypical pairs. And the typical contact pairs are the main components. According to the meso-characteristics of contact pairs, contact pair mechanical model and mathematic model of metal rubber hysteresis were set up. The mathematic model is accurate and reliable, and its parameters have clear physical meaning. The hysteresis of metal rubber can be described well with the mathematic model and metal rubber products can be designed with the formulas.