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首页> 外文期刊>Journal of the Brazilian Society of Mechanical Sciences and Engineering >Strain rate dependency of lightweight hybrid green composite laminate-an experimental study
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Strain rate dependency of lightweight hybrid green composite laminate-an experimental study

机译:轻质混合绿色复合材料层合板的应变速率依赖性-试验研究

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摘要

In this study, both Flatwise and Edgewise Charpy impact behavior and the effect of high strain rate of foreign object’s shape on the energy absorption, delamination, and failure mechanisms of biodegradable hybrid composites (BHCs) were investigated. The Kenaf–Cotton (KCCK) composite specimens were made using a hand layup method, consisting of four layers of Kenaf and Cotton woven fibers (0/90) in a PLA matrix which accounted for 76 of fiber volume fraction. In high strain rate tests, two different types of projectile’s shapes namely Flat and Ogival were used. Based on the results, the KCCK specimens under Edgewise impact loading absorbed the most energy compared to their Flatwise counterpart by 75. Furthermore, the Charpy tests revealed that the Flatwise specimens exhibited only minor deflection and surface cracks at the impacted zone, while the Edgewise specimens suffered significant delamination between the outer layers. As a result of projectile geometry in high velocity loadings, the maximum effect on specimen behavior occurred within the ballistic limit. Within this range of velocities, the projectile with a Flat nose had the worst ballistic performance with a ballistic limit velocity (17.8) greater than the projectile with an Ogival nose.
机译:本研究研究了平面和边缘简支梁冲击行为以及异物形状的高应变率对生物降解杂化复合材料(BHCs)能量吸收、分层和失效机理的影响。洋麻-棉 (KCCK) 复合试样采用手糊法制成,由四层洋麻和棉编织纤维 (0/90) 组成,位于占纤维体积分数 76% 的 PLA 基体中。在高应变率测试中,使用了两种不同类型的弹丸形状,即扁平弹丸和奥吉瓦尔弹丸。结果表明,与Flatwise冲击载荷相比,KCCK试样在边缘冲击载荷下吸收的能量最多,减少了75%。此外,简支梁试验表明,Flatwise试样在冲击区仅表现出轻微的挠度和表面裂纹,而Edgewise试样在外层之间遭受了明显的分层。由于高速载荷下的弹丸几何形状,对试样行为的最大影响发生在弹道极限内。在这个速度范围内,带有扁平鼻子的弹丸具有最差的弹道性能,弹道极限速度(17.8%)大于带有Ogival鼻子的弹丸。

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