Abstract
Vibration transmissibility is an important factor to characterize the vibration absorption performance of cushioning packaging materials during transportation. Reasonable prediction of vibration transmissibility can guide antivibration design and reduce packaging cost. As a kind of green cushioning material, paper honeycomb sandwich structure is widely used in transport packaging because of its good machinability. But at the same time, it also has strong water absorption capacity. To a great extent, the vibration transmissibility of paper honeycomb sandwich structure may be affected by ambient humidity. In this research, the vibration transmissibility of paper honeycomb sandwich structures with various structure sizes under different humidity was tested by sine frequency sweep experiments. The rule of maximal vibration transmissibility with moisture content, cell length of honeycomb, and thickness of sandwich structure was analyzed. The results show that the maximal vibration transmissibility of paper honeycomb sandwich structure increases with the increase of moisture content, cell length of honeycomb, and thickness of sandwich structure. In order to construct the relationship between maximal vibration transmissibility and various factors, the moisture content was standardized. Finally, the maximal vibration transmissibility evaluation equation of paper honeycomb sandwich structure containing standardized moisture content and size of sandwich structure was obtained, which is of some reference value for vibration prediction of paper honeycomb sandwich structures.
Highlights
In transportation, the packaging system is subjected to the continuous vibration from roads and vehicles, in which cushion materials play a key role in vibration reduction and absorption
The maximal vibration transmissibility of paper honeycomb sandwich structure is the maximal ratio of the response acceleration on the mass block to the excitation acceleration on the vibration table
The vibration transmissibility in low-frequency zone is kept at about 1 g/g, which is of little significance for antivibration analysis
Summary
The packaging system is subjected to the continuous vibration from roads and vehicles, in which cushion materials play a key role in vibration reduction and absorption. The vibration transmissibility of cushion materials directly affects their vibration energy absorption capacity, and the cushioning materials with small vibration transmissibility can absorb more vibration energy. Paper honeycomb sandwich structure is often used as a cushion pad and cushioning packing box for transport packaging of electronic instruments, furniture, and so on. Scholars in the 1960s and 1970s found that the elastic modulus and tensile strength of paper decrease with the increase of relative humidity, but the strain rate is the opposite [1,2,3]. As the moisture content of paper increases, the paper fiber absorbs moisture and swells, the free volume of paper fiber increases, and the hydrogen bond becomes more active, which leads to change in elastic modulus [1]
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