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Vertex angles effects in the energy absorption of axially crushed kenaf fibre-epoxy reinforced elliptical composite cones

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Defence Technology（防务技术） 2018年第4期14卷 327-335页

作者： Mohamed Alkateb S.M.Sapuan z.leman M.R.Ishak Mohammad Jawaid Department of Mechanical and Manufacturing Engineering Universiti Putra Malaysia Laboratory of Bio Composite Technology Institute of Tropical Forestry and Research Products (INTROP)Universiti Putra Malaysia Aerospace Manufacturing Research Centre (AMRC) Universiti Putra Malaysia Departments of Aerospace Engineering Universiti Putra Malaysia

Experimental quasi-static crushing tests were conducted by using a universal testing machine format kenaf-epoxy composite elliptical cones. The work focused on the vertex angle's effects on energy absorption capability; the vertex angles vary from 0° to 24° in 6 increments. The failure modes of the kenaf fibre epoxy composite elliptical cones were observed utilising delegate photos taken during the quasistatic crushing test. Load-deformation curves and deformation histories of typical specimens are presented and discussed. Moreover, the effects of cone vertex angles on the load carrying capacity and the energy absorption capability are also discussed. The results show that the energy absorption abilities significantly influence the ellipticity vertex angle as the load carrying capacity. We concluded that the quasi-static axial crushing behaviour of elliptical mat laminated composite cones is strongly affected by their structural geometry and the specific energy absorbed by the composite elliptical cones with vertex angles of 6°, 12°, 18°, and 24°, which is more than an elliptical cone with the vertex angle of 0°(the elliptical tube) at any given deformation. However, the specific energy absorption for the elliptical composite cone showed a positive correlation, i.e., the more the angle increased, the more energy was absorbed. In this regard, an elliptical composite cone with a 24° angle exhibited the best energy absorption capability.

关键词： Kenaf fibres Composite materials Elliptical cone Vertex angle Collapsible Energy absorption

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Effect of fibre orientations on the mechanical properties of kenaf–aramid hybrid composites for spall-liner application

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Defence Technology（防务技术） 2016年第1期12卷 52-58页

作者： R.YAH AYA S.M.SAPUAN M.JAWAID z.leman E.S.zAINUDIN Department of Mechanical and Manujacturing Engineering Universiti Putra Malaysia 43400 UPM Serdang Selangor Malaysia Science and Technology Research Institutejbr Dejence (STRIDE) 43000 Kajang Selangor Malaysia Laboratory of Biocomposite Technology Institute of Tropical Forestry and Forest Products (INTROP) Universiti Putra Malaysia 43400 UPM Serdang Selangor Malaysia Aerospace Manujacturing Research Centre (AMRC) Faculty of Engineering Universiti Putra Malaysia 43400 UPM Serdang Selangor Malaysia Department of Chemical Engineering College of Engineering King Saud University Riyadh Saudi Arabia

This paper presents the effect of kenaf fibre orientation on the mechanical properties of kenaf–aramid hybrid composites for military vehicle's spall liner application. It was observed that the tensile strength of woven kenaf hybrid composite is almost 20.78% and 43.55% higher than that of UD and mat samples respectively. Charpy impact strength of woven kenaf composites is 19.78% and 52.07% higher than that of UD and mat kenaf hybrid composites respectively. Morphological examinations were carried out using scanning electron microscopy. The results of this study indicate that using kenaf in the form of woven structure could produce a hybrid composite material with high tensile strength and impact resistance properties.

关键词：芳纶复合材料材料力学性能纤维取向红麻应用剥落编织复合材料扫描电子显微镜

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创造优质的汉语——现代汉语的历史回眸与当下关注

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温州职业技术学院学报 2011年第2期11卷 79-82页

作者：丁乐慢杭州师范大学人文学院杭州310036

汉语因独具韵感、美感在世界语言之林独树一帜。然而,现代汉语历经百年,面对网络媒体时代,美感却步步褪色。因此,梳理百年现代汉语写作历程,关注当下汉语技术化倾向,并重审当下汉语写作实践,探寻"好的中文"标准,以创造优质的汉语,重新... 详细信息

汉语因独具韵感、美感在世界语言之林独树一帜。然而,现代汉语历经百年,面对网络媒体时代,美感却步步褪色。因此,梳理百年现代汉语写作历程,关注当下汉语技术化倾向,并重审当下汉语写作实践,探寻"好的中文"标准,以创造优质的汉语,重新挖掘现代汉语写作的语感美。

关键词：现代汉语写作汉语技术化语感美作家

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