Dynamic crushing failure and energy absorption of natural bamboo-culms under axial low-velocity impact

IF 5.1 2区 工程技术 Q1 ENGINEERING, MECHANICAL
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Abstract

The axial crushing behavior of natural bamboo culms with various growth ages under quasi-static and low-velocity impact was experimentally investigated in this study. First, the macro- and micro- structural features of bamboo culms were observed, and the tensile mechanical properties of bamboo materials were measured. And then the typical crushing responses and deformation/failure patterns of dynamically-loaded bamboo culms were presented, compared with those under quasi-static load. Whereafter, the strain field distribution and energy absorption characteristics of bamboo culms were analyzed, and the crashworthiness of tested bamboo culms under impact load was evaluated. Finally, the energy absorption capacity of bamboo culms was compared with typical metallic circular tubes (made of Q235 steel and AA6061-T6 aluminum alloy) and other widely-used engineering materials/structures. The results indicate that the brittle fracture is the dominant failure mode of bamboo culms, which includes the splitting mode for internodal specimens and the bulging mode for nodal specimens. The nodal bamboo culms have a superior energy absorption capacity and crashworthiness compared to internodal bamboo culms, attributed to the dense distribution of vascular bundles and high anti-split strength of bamboo nodes. The energy absorption capacity of 1-year-old nodal bamboo culms is better than that of aluminum or steel tubes, and the corresponding SEA value of nodal bamboo culms has reached 11.8 J/g, while it is 10.65 J/g of the aluminum tube and 6.65 J/g of the steel tube, respectively.

天然竹筒在轴向低速冲击下的动态破碎破坏和能量吸收
本研究通过实验研究了不同生长年龄的天然竹秆在准静态和低速冲击下的轴向破碎行为。首先,观察了竹秆的宏观和微观结构特征,并测量了竹材的拉伸力学性能。然后,对比了竹秆在准静态载荷下的典型挤压响应和变形/破坏模式。随后,分析了竹秆的应变场分布和能量吸收特性,并评估了测试竹秆在冲击载荷下的耐撞性。最后,将竹秆的能量吸收能力与典型的金属圆管(由 Q235 钢和 AA6061-T6 铝合金制成)以及其他广泛使用的工程材料/结构进行了比较。结果表明,脆性断裂是竹秆的主要破坏模式,包括节间试样的劈裂模式和节点试样的隆起模式。与节间竹秆相比,节间竹秆具有更高的能量吸收能力和耐撞性,这归因于竹节维管束分布密集和抗劈裂强度高。1 年竹节竹秆的能量吸收能力优于铝管或钢管,其相应的 SEA 值达到 11.8 J/g,而铝管和钢管的 SEA 值分别为 10.65 J/g和 6.65 J/g。
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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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