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Investigating the behavior of laser-sintered Nylon 12 parts subject to dynamic loading

Published online by Cambridge University Press:  14 July 2014

Hoda Amel ,
Hadi Moztarzadeh ,
Jem Rongong  and
Neil Hopkinson
Hoda Amel*
Affiliation:
Department of Mechanical Engineering, University of Sheffield, Sheffield S1 3JD, UK
Hadi Moztarzadeh
Affiliation:
Warwick Manufacturing Group, University of Warwick, Coventry CV4 7AL, UK
Jem Rongong
Affiliation:
Department of Mechanical Engineering, University of Sheffield, Sheffield S1 3JD, UK
Neil Hopkinson
Affiliation:
Department of Mechanical Engineering, University of Sheffield, Sheffield S1 3JD, UK
*
a) Address all correspondence to this author. e-mail: h.amel@sheffield.ac.uk
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Abstract

Laser sintering allows producing end-use parts directly from computer files with no tooling required. For these parts to be used in industrial applications, their mechanical properties throughout in-service applications must be examined. The aim of this article is to provide an understanding of the dynamic performance of laser-sintered Nylon 12 parts. To investigate the viscoelastic properties of the material, dynamic thermal mechanical analysis has been performed in different frequencies and temperatures. Tension–tension cyclic behavior of samples has been studied and creep is shown to have a great impact in such behavior in addition to fatigue. Stress relaxation plots are provided and compared with the cyclic loading plots validating the fact that samples experience a combination of creep and fatigue in tension–tension loading. Hysteresis loops indicate brittle crack propagation in the samples experiencing fatigue.

Keywords

polymerfatigue

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Type
Articles
Information
Journal of Materials Research , Volume 29 , Issue 17: Focus Issue: The Materials Science of Additive Manufacturing , 14 September 2014 , pp. 1852 - 1858
Copyright
Copyright © Materials Research Society 2014 

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