Low-velocity impact of castor oil-based rigid polyurethane foams: Experiments, microstructure effects and constitutive modelling

IF 5.1 2区 工程技术 Q1 ENGINEERING, MECHANICAL International Journal of Impact Engineering Pub Date : 2024-11-01 DOI:10.1016/j.ijimpeng.2024.105156
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Abstract

Rigid polyurethane foams (RPUFs) are widely used in impact protection applications due to their tunable mechanical properties. Recently, RPUFs derived from bio-based sources such as castor oil have been investigated as a greener and more sustainable alternative to replace fossil-based polyurethane foams. It is thus important to understand the mechanical response of these materials to low-velocity impact (LVI), which still needs to be explored. This study aims to fill this gap by evaluating the performance of three types of RPUFs developed from commercially available castor oil-based resins. Drop weight impact tests at different impact energies were performed to investigate the LVI characteristics of the foams. Furthermore, an extensive micro-computed tomography investigation was carried out to improve the understanding of the microstructure of RPUFs and how the composition of these porous materials affected the foam architecture and the macroscopic mechanical response. Finally, a constitutive relationship is proposed to describe and predict the materials’ response at different impact energies.
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蓖麻油基硬质聚氨酯泡沫的低速冲击:实验、微观结构效应和构成模型
硬质聚氨酯泡沫(RPUF)因其可调整的机械性能而被广泛应用于冲击防护领域。最近,人们研究了从蓖麻油等生物来源提取的 RPUF,认为这是一种更环保、更可持续的替代品,可以取代化石基聚氨酯泡沫。因此,了解这些材料对低速冲击(LVI)的机械响应非常重要,这一点仍有待探索。本研究旨在通过评估利用市售蓖麻油基树脂开发的三种 RPUF 的性能来填补这一空白。研究人员在不同的冲击能量下进行了落重冲击试验,以研究泡沫的 LVI 特性。此外,还进行了广泛的微观计算机断层扫描研究,以加深对 RPUF 微观结构以及这些多孔材料的成分如何影响泡沫结构和宏观机械响应的了解。最后,提出了一种构成关系来描述和预测材料在不同冲击能量下的响应。
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来源期刊
International Journal of Impact Engineering
International Journal of Impact Engineering 工程技术-工程:机械
CiteScore
8.70
自引率
13.70%
发文量
241
审稿时长
52 days
期刊介绍: The International Journal of Impact Engineering, established in 1983 publishes original research findings related to the response of structures, components and materials subjected to impact, blast and high-rate loading. Areas relevant to the journal encompass the following general topics and those associated with them: -Behaviour and failure of structures and materials under impact and blast loading -Systems for protection and absorption of impact and blast loading -Terminal ballistics -Dynamic behaviour and failure of materials including plasticity and fracture -Stress waves -Structural crashworthiness -High-rate mechanical and forming processes -Impact, blast and high-rate loading/measurement techniques and their applications
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