Development and validation of a method to determine the frequency- and temperature-dependent stiffness and damping properties of plastics for the structure-borne noise simulation more precisely using the example of the for the ultrasonic welding process r

开发和验证一种方法，以确定塑料的与频率和温度相关的刚度和阻尼特性，以使用超声波焊接工艺的示例更精确地进行结构噪声模拟

• 批准号: 398244070
• 负责人: Professor Dr.-Ing. Christian Hopmann
• 金额: --
• 依托单位: Institut für Kunststoffverarbeitung (IKV) in Industrie und Handwerk an der RWTH Aachen
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2018
• 资助国家: 德国
• 起止时间: 2017-12-31 至 2021-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/398244070?language=en
• 关键词: Development; validation; method; determine; frequency

The ultrasonic welding has been established in the industry since the 1960s. Up to now, the design of the joining parts is usually based on the user experience. As well as the geometric design of the joining part bodies, which has to be suitable for welding, an appropriate component construction requires the consideration of constructive details, such as a process-specific design of the joining zone geometry. Additional functional elements or rib structures, which directly affect the structure-borne sound processes and thus the welding process, are often also to be taken into account. In general, extensive practical trials are necessary before the start of production.The component development also requires extensive practical trials for the determination of the welding parameters. In many cases, iterative elaborate and cost-intensive redesigns of the injection moulding tools arise to influence the sound propagation, so that a high-quality weld seam is achieved. The material analysis of the dynamic stiffness and damping behaviour of plastics is challenging due to the high frequencies of ultrasonic welding, and can only be carried out by means of iterative approaches. Realistic simulation of the acoustic structure interactions can be contributed to detect and avoid critical areas. However, input data are required, which precisely reflect the viscoelastic material behaviour of thermoplastic plastics.The aim of the research project is a further development of an alternative method, which is based on a reverse engineering process. This is supposed to determine mechanical characteristic values for an amorphous plastic (PMMA) and two semi-crystalline plastics (PP and PA), which allow a model description of the complex structure-borne sound processes in joining parts for the ultrasonic welding process, taking into account thermal influences.With the help of the research results, it is to be shown that the appropriate joining part design can already take place in the design phase. As a result, time and cost-intensive iterations in the development phase of complex joining parts will be omitted. Furthermore, a comprehensive basis for a better material and process understanding of the highly dynamic ultrasonic welding process and the sound propagation will be created.

自1960年代以来，超声波焊接已在该行业建立。到目前为止，连接零件的设计通常基于用户体验。除了必须适合焊接的连接零件物体的几何设计外，适当的组件结构还需要考虑建设性细节，例如连接区几何形状的特定过程设计。通常还要考虑其他功能元素或肋骨结构，这些功能元素或肋骨结构直接影响结构传播的声音过程，从而直接影响焊接过程。通常，在生产开始之前需要进行广泛的实践试验。组件开发还需要进行广泛的实用试验来确定焊接参数。在许多情况下，迭代性详细且成本密集的注射成型工具的重新设计会影响声音传播，从而实现高质量的焊缝。由于超声焊接的高频，塑料的动态刚度和阻尼行为的材料分析具有挑战性，并且只能通过迭代方法进行。对声学结构相互作用的现实模拟可以有助于检测和避免关键领域。但是，需要输入数据，这准确反映了热塑性塑料的粘弹性材料行为。研究项目的目的是基于反向工程过程的替代方法的进一步开发。这应该确定无定形塑料（PMMA）和两个半晶塑料（PP和PA）的机械特性值，这些塑料（PP和PA）允许对复杂的结构 - 播种声音过程进行模型描述，以考虑到超声焊接过程的零件，并考虑到热影响的超声焊接过程。在研究结果的帮助下，它可以显示出适当的零件设计，即进行设计阶段的设计。结果，将省略在复杂加入零件的开发阶段的时间和成本密集的迭代。此外，将创建对高度动态的超声焊接过程和声音传播的更好材料和过程理解的综合基础。