Abstract
Cushioning materials are used in order to protect products from shock and vibration during transportation. Normally, it is often difficult to achieve both cushioning and damping, because cushioning materials suitable for cushioning are different from ones suitable for damping. The maximum acceleration during an impact has been used as an index for cushioning, and the RMS value of acceleration during a vibration as an index for damping. If both the values can be reduced, it can achieve both of the above. In this paper, it was considered that both the values could be reduced by adding a feature to the shape of the stress-strain curve of cushioning materials. Here, based on a general stress-strain curve, the rise was changed to a steeper shape, and the changes of both the values were examined. As a result, it was found that the RMS value could be reduced, because the resonant frequency of packaged freights was higher than the dominant frequency band of truck bed. It was found that the appropriate shape change had almost no effect on the maximum acceleration. From these, it is considered that the steep rise of the stress-strain curve will help to achieve both of the above.
https://ror.org/03r38cy24 
