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Papers by mohamed Alkateb

2020 11th International Renewable Energy Congress (IREC)

The energy absorption capability of a composite material is critical to developing improved human... more The energy absorption capability of a composite material is critical to developing improved human safety in an automotive crash. Changes many parameters like matrix type, fiber type, specimen geometry and testing speed can cause subsequent changes in the specific energy absorption of composite materials. Hence, the purpose of this work is to investigate the effects of vertex angle on energy absorption, which considerably affect the axial collapse load of unidirectional wool composite elliptical tubes. Experimental crushing tests have been carried out by universal testing machine for unidirectional filament wound laminated wool-epoxy elliptical tubes and with constant speed of 15 mm/min. The vertex angles of wool-epoxy elliptical tubes vary from 0° to 12° in 4 increments, and lengths of 100 mm were tested. The results showed that the specific energy absorbed by the composite elliptical tubes (cones) with the vertex angles of 4°, 8° and 12°, is more than that in an elliptical tube with the vertex angle of 0°. In this regard, elliptical composite tube (cone) with angle of 12° exhibited the best energy absorption capability.

JOURNAL OF MECHANICAL ENGINEERING AND SCIENCES

This current study is to investigate the behaviour of the kenaf/wool natural fibre. Reinforced co... more This current study is to investigate the behaviour of the kenaf/wool natural fibre. Reinforced composite elliptical cones with different content of fibre for each of the two types separately in absorbing energy and the load capacity, the lack studies about the composite elliptical tube, our focus was on this shape of shells of effect content of fibre for each of the two types separately. Various fibre contents were considered, including 30 wt%, 35 wt% and 40 wt%. The composite elliptical tubes were subjected to an axial quasi-static crushing test to achieve the study objectives; the methodology has been divided into three main sections concerning the problem statement, the first section is the mandrels preparation; the second section is specimen's fabrication process and finally is the crushing test. This study concerns the usage of the composite elliptical tube as a collapsible energy absorbing device within an automobile structure, which is supported at the distal end (i.e. the point of attachment) by a stronger structure and is designed to behave in a manner more similar to the quasi-static axial regular progressive mode. Therefore, quasi-static axial compression tests were performed on the tubes using INSTRON universal servohydraulic testing machine. The materials used in this study are polymer resin and kenaf/wool fibres. Environmentally friendly kenaf and wool fibre were used in this study due to several advantages such as environmentally benign, lightweight, low cost, no health risk, and availability. Results showed that including 30 wt% has a higher value of load-caring capacity and energy-absorption capability than including 35wt% and including 40 wt%. The results also show that the wool fibre has a higher value of load-carrying capacity and energy-absorption capability than kenaf fibre.

Polimery

In this paper, an investigation on crushing behavior of kenaf fiber/wooden stick reinforced epoxy... more In this paper, an investigation on crushing behavior of kenaf fiber/wooden stick reinforced epoxy hybrid composite elliptical tubes is presented. Kenaf fiber reinforced epoxy elliptical composite tubes, unsupported and supported by wooden sticks (4, 6 and 8), were fabricated using hand lay-up process. The crushing tests were performed at a constant speed of 20 mm/s to explore the potential effect of wooden sticks on the specific energy and mechanical behavior of kenaf fiber reinforced epoxy composite elliptical tubes. As a result of the study, it was found that the load carrying capacities of kenaf fiber reinforced epoxy composite tubes were gradually increased with the number of wooden sticks. Generally, the investigation showed that kenaf fiber reinforced epoxy composite elliptical tubes supported by wooden sticks demonstrated superior specific energy absorption and crashworthiness compared to the composite tubes unsupported. Further, the results also revealed that all specimens have failed in longitudinal failure modes. In this regard, an elliptical composite tube supported by 8 wooden sticks exhibited the best energy absorption capability.

Fibers and Polymers

In the present study, the influence of circumferential holes on the energy absorption capacity an... more In the present study, the influence of circumferential holes on the energy absorption capacity and load carrying ability of kenaf fibre-reinforced composite elliptic tubes was experimentally investigated. A series of experiments were performed for composite elliptical tubes with different circumferential perforations (0, 4, 6 and 8 holes). This range is suitable for obtaining the adjusted distance. Kenaf fibre matte foam was used in this study due to several advantages, such as low cost, low health risk, light weight, and availability. The kenaf was 4 mm thick with a density of 0.17 g/cm 3. To investigate the influence of circumferential holes on the energy absorption capability, a pseudo static axial crash test was independently performed on these samples. The results showed that the structure failed in progressive failure mode and showed crushing failure with longitudinal cracks. The test results revealed that the specific energy assimilated by the compound elliptical tube with 8 circumferential holes showed the highest mean crushing stress value compared with other compound elliptical tubes.

2020 11th International Renewable Energy Congress (IREC)

The energy absorption capability of a composite material is critical to developing improved human... more The energy absorption capability of a composite material is critical to developing improved human safety in an automotive crash. Changes many parameters like matrix type, fiber type, specimen geometry and testing speed can cause subsequent changes in the specific energy absorption of composite materials. Hence, the purpose of this work is to investigate the effects of vertex angle on energy absorption, which considerably affect the axial collapse load of unidirectional wool composite elliptical tubes. Experimental crushing tests have been carried out by universal testing machine for unidirectional filament wound laminated wool-epoxy elliptical tubes and with constant speed of 15 mm/min. The vertex angles of wool-epoxy elliptical tubes vary from 0° to 12° in 4 increments, and lengths of 100 mm were tested. The results showed that the specific energy absorbed by the composite elliptical tubes (cones) with the vertex angles of 4°, 8° and 12°, is more than that in an elliptical tube with the vertex angle of 0°. In this regard, elliptical composite tube (cone) with angle of 12° exhibited the best energy absorption capability.

JOURNAL OF MECHANICAL ENGINEERING AND SCIENCES

This current study is to investigate the behaviour of the kenaf/wool natural fibre. Reinforced co... more This current study is to investigate the behaviour of the kenaf/wool natural fibre. Reinforced composite elliptical cones with different content of fibre for each of the two types separately in absorbing energy and the load capacity, the lack studies about the composite elliptical tube, our focus was on this shape of shells of effect content of fibre for each of the two types separately. Various fibre contents were considered, including 30 wt%, 35 wt% and 40 wt%. The composite elliptical tubes were subjected to an axial quasi-static crushing test to achieve the study objectives; the methodology has been divided into three main sections concerning the problem statement, the first section is the mandrels preparation; the second section is specimen's fabrication process and finally is the crushing test. This study concerns the usage of the composite elliptical tube as a collapsible energy absorbing device within an automobile structure, which is supported at the distal end (i.e. the point of attachment) by a stronger structure and is designed to behave in a manner more similar to the quasi-static axial regular progressive mode. Therefore, quasi-static axial compression tests were performed on the tubes using INSTRON universal servohydraulic testing machine. The materials used in this study are polymer resin and kenaf/wool fibres. Environmentally friendly kenaf and wool fibre were used in this study due to several advantages such as environmentally benign, lightweight, low cost, no health risk, and availability. Results showed that including 30 wt% has a higher value of load-caring capacity and energy-absorption capability than including 35wt% and including 40 wt%. The results also show that the wool fibre has a higher value of load-carrying capacity and energy-absorption capability than kenaf fibre.

Polimery

In this paper, an investigation on crushing behavior of kenaf fiber/wooden stick reinforced epoxy... more In this paper, an investigation on crushing behavior of kenaf fiber/wooden stick reinforced epoxy hybrid composite elliptical tubes is presented. Kenaf fiber reinforced epoxy elliptical composite tubes, unsupported and supported by wooden sticks (4, 6 and 8), were fabricated using hand lay-up process. The crushing tests were performed at a constant speed of 20 mm/s to explore the potential effect of wooden sticks on the specific energy and mechanical behavior of kenaf fiber reinforced epoxy composite elliptical tubes. As a result of the study, it was found that the load carrying capacities of kenaf fiber reinforced epoxy composite tubes were gradually increased with the number of wooden sticks. Generally, the investigation showed that kenaf fiber reinforced epoxy composite elliptical tubes supported by wooden sticks demonstrated superior specific energy absorption and crashworthiness compared to the composite tubes unsupported. Further, the results also revealed that all specimens have failed in longitudinal failure modes. In this regard, an elliptical composite tube supported by 8 wooden sticks exhibited the best energy absorption capability.

Fibers and Polymers

In the present study, the influence of circumferential holes on the energy absorption capacity an... more In the present study, the influence of circumferential holes on the energy absorption capacity and load carrying ability of kenaf fibre-reinforced composite elliptic tubes was experimentally investigated. A series of experiments were performed for composite elliptical tubes with different circumferential perforations (0, 4, 6 and 8 holes). This range is suitable for obtaining the adjusted distance. Kenaf fibre matte foam was used in this study due to several advantages, such as low cost, low health risk, light weight, and availability. The kenaf was 4 mm thick with a density of 0.17 g/cm 3. To investigate the influence of circumferential holes on the energy absorption capability, a pseudo static axial crash test was independently performed on these samples. The results showed that the structure failed in progressive failure mode and showed crushing failure with longitudinal cracks. The test results revealed that the specific energy assimilated by the compound elliptical tube with 8 circumferential holes showed the highest mean crushing stress value compared with other compound elliptical tubes.