Energy Absorption of Expanded Polyurethane under Cycling Compression and Impact

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Journal of Vibration and Shock ›› 2015, Vol. 34 ›› Issue (5) : 44-48.

Based on quasi-static compression and drop hammer impact tests, the mechanical property and energy absorption of expanded polyurethane (EPU) were analyzed, and the stress-strain curve and energy absorption diagram were obtained at low and intermediate strain rates. The effects of different initial strain rates and cycling compression and impact tests on the cushioning properties of EPU were investigated. The stress and energy absorption of EPU increased obviously when the initial strain rate increased from 2.56×10-3 s-1 (quasi-static) to 4.01×101s-1, 5.08×101s-1 and 5.68×101s-1. Compared with the lowest initial strain rate, the stress increased respectively 54.34%, 79.35% and 114.49%, and the energy absorption 18.98%, 30.09% and 65.74% when the strain was 0.4. Five times cycling static compression or drop hammer impact tests were carried out on each sample. Compared with the first test, the stress and energy absorption of EPU in the rest tests declined obviously. When the strain was 0.4, the static stress declined respectively 18.48%, 32.97%, 36.59% and 39.49%, the dynamic stress 20.81%, 28.48%, 34.75% and 34.75%, the energy absorption in quasi-static compression 24.54%, 37.50%, 40.74% and 43.52%, and the energy absorption in drop hammer impact 15.30%, 24.20%, 30.25% and 30.96%. The effects of strain rate and cycling compression and impact on the cushioning property of EPU were obvious at low and intermediate strain rates. After some cycling static compression or drop hammer impact, the cushioning properties of EPU remained unchanged. So, we can design cushioning packaging according to the data. The results of this study can provide the reference for the design of EPU in cushioning packaging.

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Abstract

Based on quasi-static compression and drop hammer impact tests, the mechanical property and energy absorption of expanded polyurethane (EPU) were analyzed, and the stress-strain curve and energy absorption diagram were obtained at low and intermediate strain rates. The effects of different initial strain rates and cycling compression and impact tests on the cushioning properties of EPU were investigated. The stress and energy absorption of EPU increased obviously when the initial strain rate increased from 2.56×10-3 s-1 (quasi-static) to 4.01×101s-1, 5.08×101s-1 and 5.68×101s-1. Compared with the lowest initial strain rate, the stress increased respectively 54.34%, 79.35% and 114.49%, and the energy absorption 18.98%, 30.09% and 65.74% when the strain was 0.4. Five times cycling static compression or drop hammer impact tests were carried out on each sample. Compared with the first test, the stress and energy absorption of EPU in the rest tests declined obviously. When the strain was 0.4, the static stress declined respectively 18.48%, 32.97%, 36.59% and 39.49%, the dynamic stress 20.81%, 28.48%, 34.75% and 34.75%, the energy absorption in quasi-static compression 24.54%, 37.50%, 40.74% and 43.52%, and the energy absorption in drop hammer impact 15.30%, 24.20%, 30.25% and 30.96%. The effects of strain rate and cycling compression and impact on the cushioning property of EPU were obvious at low and intermediate strain rates. After some cycling static compression or drop hammer impact, the cushioning properties of EPU remained unchanged. So, we can design cushioning packaging according to the data. The results of this study can provide the reference for the design of EPU in cushioning packaging.

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expanded polyurethane / strain rate / cycling test / stress-strain curve / energy absorption diagram

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Wang Li-Jun1,2, Zhang Yan1,2, Wang Zhi-Wei1,2. Energy Absorption of Expanded Polyurethane under Cycling Compression and Impact[J]. Journal of Vibration and Shock, 2015, 34(5): 44-48

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