|
doi:10.3850/978-981-08-6555-9_180
Comparison of the Local Mechanical Properties of a Microinjection Moulded Part with a Classical One through Nanoindentation Tests
J. Giboz1, M. Vite1,2, S. Bec2, J. L. Loubet2, T. Copponnex3 and P. Mélé1
1LMOPS, CNRS UMR 5041, Université de Savoie, 73376 Le Bourget-du-Lac, France
2LTDS, CNRS UMR 5513 CNRS/ECL/ENISE, Ecole Centrale de Lyon, Ecully, France
3CENDRES & METAUX SA, Rue de Boujean 122, CH-2501 Biel/Bienne, Switzerland
ABSTRACT
The thermomechanical conditions occurring in the part during injection moulding modify both the morphology and the mechanical properties of the final product. With microinjection moulding, the processing conditions promote the homogeneity of the morphology through the part thickness, but also favour the flow-induced crystallization. Highly oriented structures are seen in a micropart of 150 µm thick (µpart) [1].
The aim of the present study lies in the comparison between the mechanical properties of this µpart compared to a standard part (1.5 mm thick), with the help of nanoindentation measurements. The reduced elastic modulus (E*) and the hardness (H) were estimated within the thickness of both samples, at two locations. These two kinds of samples exhibit significantly different mechanical properties. The results are related to the formation of different crystalline architecture in the parts, induced by specific processing conditions.
Keywords: Microinjection moulding, Elastic modulus, HDPE, Nanoindentation, Hardness.
Back to TOC
FULL TEXT(PDF)
|