Abstract
Research and/or Engineering Questions/Objective:
In response to mandates from the automotive industry for lightweight damping solutions to increase passenger comfort, Avery Dennison Performance Tapes established an objective of developing pressure-sensitive adhesives tapes for use in a constraint layer damping construction for automotive applications. The tapes would have the added advantage of functioning as an in-design solution, a capability made possible by the availability of rapid prototyping software. The resulting product offering would consist of a complete portfolio of damping adhesives meeting automotive industry needs for harnessing noise vibration, and meeting or exceeding requirements for temperature and frequency, bonding performance, and internal strength and durability.
Methodology:
Avery Dennison Performance Tapes is a world-class materials science business that can pull from a wide range of technologies. The company employed its own adhesive formulation skills with elastomeric, acrylic and silicone-based materials to produce pressure-sensitive adhesive tapes with damping capabilities for manufacturers of automotive components and CLD-steel. The process required broadening the company’s laboratory testing capabilities for NVD characterization, including DMA, VBT measurement, design software predicting CLD loss factor and RFR sound measurements.
Results:
The paper provides results of a case study in which Avery Dennison Performance Tapes developed the damping layer for a motor compartment part application (oil pan). Using its formulation capabilities, Avery Dennison developed a damping layer that meets the target damping temperature range for this motor compartment part while providing the required physical properties for bonding strength and durability. Tests revealed the following results: 1) acrylic adhesives are the best candidate for meeting the component specifications with regard to bond strength, shear holding strength, long-term environmental performance and environmental cycling tests; 2) high-temperature damping acrylic provides optimal damping behaviour (composite loss factor) in a temperature range of 25 degrees C to 95 degrees C; and 3) in the selected high-temperature damping acrylic, the adhesive’s damping resonance peaked at 80 degrees C in a wide range of frequencies.
Limitations of this study:
This study’s tests did not address ultra-cold, ultra-high, broad damping performance. These areas are scheduled for continued research and development.
What does the paper offer that is new in the field in comparison to other works of the author:
Avery Dennison, by leveraging its wide range of technologies, has developed the capability to tune self-adhesive damping layers to function optimally in a wide range of temperatures or in a targeted temperature range. A portfolio was established including cold-temperature damping acrylic adhesives, room-temperature dampers and high-temperature damping acrylic adhesives. In addition, the portfolio contains silicone adhesive-based damping layers offering a very high-temperature performance limit for applications requiring extreme durability.
Conclusion:
Our research and development has produced a range of pressure-sensitive adhesives and tape construction solutions for automotive damping that outperform existing solutions in terms of low, high and broad temperature and frequency ranges.
KEYWORDS – lightweight, damping frequency, temperature extremes, vibration damping, noise reduction