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Aalborg, Denmark

Oshkovr S.A.,Fibigerstraed | Taher S.T.,Fibigerstraed | Oshkour A.A.,University of Malaya | Ariffin A.K.,National University of Malaysia | Azhari C.H.,National University of Malaysia
Composite Structures | Year: 2013

The conditions of test obtained experimentally were simulated using Dytran a non-linear finite element explicit analysis software implemented to the simulation since this mimics the characteristics of the behaviour of the crashworthiness. Results from the finite element analysis were validated against the experimental results and a good agreement between two approaches was observed i.e. the average errors of total absorbed energy (E total) (6.1%) and crush force efficiency (CFE) (9%) were obtained. The simulation depicted catastrophic failures similar to experimental results i.e. local buckling and mid length buckling failure in the specimens in the resulting geometries. This agreement builds confidence in the future use of non-linear finite element for the design of silk/epoxy composite structure subjected to crash loading in energy-absorbing applications such as in the automotive as well as in the aircraft industries. © 2012 Elsevier Ltd. Source


Oshkovr S.A.,National University of Malaysia | Eshkoor R.A.,National University of Malaysia | Taher S.T.,Fibigerstraed | Ariffin A.K.,National University of Malaysia | Azhari C.H.,National University of Malaysia
Composite Structures | Year: 2012

This research concentrates on the evaluation of crashworthiness characteristics of natural silk/epoxy composite square tubes energy-absorbers. Composite laminate specimens were subjected to static axial compression load and experimental evaluation of the energy absorption capability of silk/epoxy composite. Specimens were in the form of square cross-sections with the dimension of 80mm×80mm and a radius curvature of 5mm. The variables in the experiment were the length of the tubes built 50mm, 80mm and 120mm. Meanwhile, the thickness of the walls, consisting of laminates of silk/epoxy of 12, 24 and 30 plies, correspond to equivalent wall thickness of 1.7mm, 3.4mm and 4.2mm, respectively. The parameters measured were the total absorbed energy (E total), and the crash force efficiency (CFE). E total is the measure of the amount of energy that the structure can withstand without failure and thus is a measure of its strength, while CFE gives a quantitative indication of the mode of failure of the composites. The mode of failure was observed using photography. © 2012 Elsevier Ltd. Source


Ataollahi S.,National University of Malaysia | Taher S.T.,Fibigerstraed | Eshkoor R.A.,National University of Malaysia | Ariffin A.K.,National University of Malaysia | Azhari C.H.,National University of Malaysia
Composites Part B: Engineering | Year: 2012

This paper focuses on natural silk/epoxy composite square tubes energy absorption and failure response. The tested specimens were featured by a material combination of different lengths and same numbers of natural silk/epoxy composite layers in form of reinforced woven fabric in thermosetting epoxy resin. Tubes were compressed in INSTRON 5567 with a loading capacity of 30 kN. This research investigates the influence of the wall lengths on the compressive response and also failure mode of the tested tubes are analysed. The load-displacement behaviour of square tubes recorded during the test. Since natural woven silk has been used as textile in centuries but due to rare study of this fabric as reinforcement material for composites, the results of this paper can be considerable. Outcomes from this paper might be helpful to guide the design of crashworthy structures. © 2011 Elsevier Ltd. All rights reserved. Source

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