West Midlands, United Kingdom
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Mouti Z.,Cranfield University | Westwood K.,Automotive Group | Kayvantash K.,Cranfield University | Njuguna J.,Cranfield University
Materials | Year: 2010

This paper concerns automotive parts located underneath the engine and in particular the engine oil pan. Classically made of stamped steel or cast aluminum, new developments have allowed the manufacture oil pans with polyamide 66 reinforced by 35% weight of short glass fiber. However, polyamides have some limitations and the most significant is their response to localized impact loading. The nature of the impact considered here is of a typical stone collected from the road and projected into the oil pan. Low velocity impact investigations were carried out using a gas gun and drop weight tower. The study shows that the design of the oil pan has a significant contribution in the shock absorption. In addition to the material properties, the geometry and the ribbing both cleverly combined, increase the impact resistance of the component significantly. Areas of oil pan design improvement have been identified and conclusions drawn. © 2010 by the authors.


Mouti Z.,Cranfield University | Westwood K.,Automotive Group | Long D.,Automotive Group | Njuguna J.,Cranfield University
Steel Research International | Year: 2012

This paper investigates low velocity impact involving a glass fiber-reinforced polyamide engine oil pan as part of a complete new development of thermoplastic components. The assessment of the impact resistance has driven the need to employ LS DYNA for finite element modeling in order to benchmark and predict the strength and fracture behavior of stressed plastic parts. In order to develop a reliable predictive capability and to validate simulations, complete components were manufactured by injection molding techniques for the experimental samples. Low velocity impact investigations were carried out using a gas gun and a falling weight tester in order to simulate impact events to which the oil pan is subjected whilst in operational service. This was intended to point out damage tolerance and failure mechanisms likely to occur in the structure. The study results show the significant contribution of the design in terms of shock absorption. Specific oil pan design with protective ribbing combined with a superior material considerably improves the impact resistance. The paper provides results and discussions on experimental and finite element analysis investigations before concluding with some remarks. This paper investigates low velocity impact involving a glass fiber-reinforced polyamide engine oil pan as part of a complete new development of thermoplastic components. The study results from experimental and finite element analysis show that this specific oil pan design with protective ribbing combined with a superior material significantly improves the shock absorption and impact resistance. Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Mouti Z.,Cranfield University | Westwood K.,Automotive Group | Long D.,Automotive Group | Njuguna J.,Cranfield University
Composite Structures | Year: 2013

In the automotive industry, more and more engineered parts are shifting from metals to engineering plastics. However localised impact loading and long term ageing effects of under-the-hood plastic components is not well understood. In this paper, localised low velocity impact experiments and simulations were conducted on glass fibre-reinforced polyamide sump to investigate typical flying stones impact scenarios. Complete components were manufactured by injection moulding techniques for the experimental samples. The samples were then subjected to a range of low velocity impact using drop weight tower and flying projectiles from an air gun. Damage assessments were then performed following the experiments. In parallel, finite element analysis using LS DYNA was carried out to virtually benchmark and to predict the strength and fracture behaviour of stressed plastic parts. This has permitted to perform numerous impact tests in different situations with varying parameters. The study results show the significant contribution of the design in terms of shock absorption. The specific sump design with a protective ribbing combined with a superior material increases considerably the impact resistance. The paper will provided detailed discussions and results from both the experiments and finite element analysis investigations. © 2013 Elsevier Ltd.

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