Dynamic compressive mechanical properties and constitutive models of flexible polyurethane foam

被引：0
|
作者：
Su X. [1 ]
Zhou L. [1 ,2 ]
Jing L. [1 ]
Deng G. [3 ]
Zhao L. [4 ]
机构：
[1] State Key Laboratory of Traction Power, Southwest Jiaotong University, Sichuan, Chengdu
[2] Sichuan Aviation Industry Chuanxi Machinery Co. Ltd., Sichuan, Yaan
[3] China Special Equipment Inspection and Research Institute, Beijing
[4] Institute of Applied Mechanics, Taiyuan University of Technology, Shanxi, Taiyuan
来源：
Baozha Yu Chongji/Explosion and Shock Waves | 2022年 / 42卷 / 09期
关键词：
compressive mechanical properties; constitutive model; energy absorption; flexible polyurethane foam; strain rate sensitivity;
D O I：
10.11883/bzycj-2022-0201
中图分类号：
学科分类号：
摘要：
The quasi-static and dynamic compressive mechanical properties of flexible polyurethane foam were studied by using a DDL-200 electronic universal testing machine and an Instron 9350 drop-weight testing machine in a range of strain rates from 0.001 to 100 s−1. The stress-strain characteristics and strain rate sensitivity were analyzed, and the effect of strain rate on strain rate sensitivity index and energy absorption performance was discussed. Based on the experimental results, the strain rate-independent constitutive model was established to accurately describe the dynamic compressive mechanical behavior of the flexible polyurethane foam. The results show that the compressive stress-strain responses of flexible polyurethane foam exhibit typical three-stage deformation characteristics including initial elastic region, extended plateau region and final densification region, and the characteristics of material mesostructure at different deformation regions were analyzed. In addition, the material display an obvious strain rate-strengthening effect, both the yield stress and platform stress increase with the increase of strain rate, and the strain rate sensitivity index is affected by the coupling of strain rate and compressive strain. The energy absorption, energy absorption efficiency and specific energy absorption of flexible polyurethane foam at different strain rates were compared and the material shows higher energy absorption efficiency but less energy absorption, and strain rate has little effect on maximum energy absorption efficiency and specific energy absorption under quasi-static loading. With the increase of strain rate, the maximum energy absorption efficiency significantly reduces and the specific energy absorption significantly increases under dynamic loading. Both the modified Sherwood-Frost model and the modified Avalle model considering the effect of strain rate can well characterize the static and dynamic compressive stress-strain responses of the flexible polyurethane foam, but the modified Avalle model is easier to apply in engineering due to its fewer parameters. The research results can provide a guide for the design and optimization of flexible polyurethane foam on impact-resistant structures. © 2022 Explosion and Shock Waves. All rights reserved.
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