Shrinkage and Warpage in the Permanent Shape of Sape-Memory Polyurethane Parts

Katmer, Sukran; Karatas, Cetin

Sukran Katmer, Cetin Karatas

Shrinkage and Warpage in the Permanent Shape of Sape-Memory Polyurethane Parts

Abstract:
The shape memory effect, as the most important ability of shape memory polymers, is a working property and provides the design ability to shape memory polymer features. Shrinkage and warpage are important parameters to control the dimensional accuracy of permanent and temporary shapes of an injection moulded shape memory polyurethane (SMPU) part. In this study, the effects of injection moulding parameters on the shrinkage and warpage of the permanent shape of moulded SMPU parts were experimentally investigated. The parameters of injection pressure, melt temperature, mould temperature, packing pressure, packing time, and cooling time, were chosen as the injection moulding control factors. Taguchi’s L27 orthogonal array design table was used with six injection moulding parameters and their three levels. The results showed that the part has different shrinkage ratios in three main directions, namely, the flow direction, perpendicular to the flow direction, and the direction through the thickness. The results of the analysis of variance showed that the cooling time is the most influential parameter on both the shrinkage (except in thickness) and warpage. The shrinkage in the flow direction as well as in perpendicular to the flow direction decreased with increasing the cooling time. Warpage also decreased with increasing the cooling time. Injection pressure and melt temperature were found to be effective on shrinkage in thickness. Effects of mould temperature, packing pressure, and packing time were found to be limited. A statistically significant relationship has been noticed among shrinkage, warpage, and residual stresses during the study.

Keywords:
shape memory polyurethanes; injection moulding; permanent shape; shrinkage; warpage

Issue: 2021 Volume 58, Issue 4

Pages: 102-113

Publication date: 2022/1/4

https://doi.org/10.37358/MP.21.4.5536

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This article is published under the Creative Commons Attribution 4.0 International License

Citation Styles

Cite this article as:
KATMER, S., KARATAS, C., Shrinkage and Warpage in the Permanent Shape of Sape-Memory Polyurethane Parts, Mater. Plast., 58(4), 2021, 102-113. https://doi.org/10.37358/MP.21.4.5536

Vancouver
Katmer S, Karatas C. Shrinkage and Warpage in the Permanent Shape of Sape-Memory Polyurethane Parts. Mater. Plast.[internet]. 2021 Dec;58(4):102-113. Available from: https://doi.org/10.37358/MP.21.4.5536

APA 6th edition
Katmer, S., Karatas, C. (2021). Shrinkage and Warpage in the Permanent Shape of Sape-Memory Polyurethane Parts. Materiale Plastice, 58(4), 102-113. https://doi.org/10.37358/MP.21.4.5536

Harvard
Katmer, S., Karatas, C. (2021). 'Shrinkage and Warpage in the Permanent Shape of Sape-Memory Polyurethane Parts', Materiale Plastice, 58(4), pp. 102-113. https://doi.org/10.37358/MP.21.4.5536

IEEE
S. Katmer, C. Karatas, "Shrinkage and Warpage in the Permanent Shape of Sape-Memory Polyurethane Parts". Materiale Plastice, vol. 58, no. 4, pp. 102-113, 2021. [online]. https://doi.org/10.37358/MP.21.4.5536

Text
Sukran Katmer, Cetin Karatas,
Shrinkage and Warpage in the Permanent Shape of Sape-Memory Polyurethane Parts,
Materiale Plastice,
Volume 58, Issue 4,
2021,
Pages 102-113,
ISSN 2668-8220,
https://doi.org/10.37358/MP.21.4.5536.
(https://revmaterialeplastice.ro/Articles.asp?ID=5536)
Keywords: shape memory polyurethanes; injection moulding; permanent shape; shrinkage; warpage

RIS
TY - JOUR
T1 - Shrinkage and Warpage in the Permanent Shape of Sape-Memory Polyurethane Parts
A1 - Katmer, Sukran
A2 - Karatas, Cetin
JF - Materiale Plastice
JO - Mater. Plast.
PB - Materiale Plastice SRL
SN - 2668-8220
Y1 - 2021
VL - 58
IS - 4
SP - 102
EP - 113
UR - https://doi.org/10.37358/MP.21.4.5536
KW - shape memory polyurethanes
KW - injection moulding
KW - permanent shape
KW - shrinkage
KW - warpage
ER -

BibTex
@article{MatPlast2021P102,
author = {Katmer Sukran and Karatas Cetin},
title = {Shrinkage and Warpage in the Permanent Shape of Sape-Memory Polyurethane Parts},
journal = {Materiale Plastice},
volume = {58},
number = {4},
pages = {102-113},
year = {2021},
issn = {2668-8220},
doi = {https://doi.org/10.37358/MP.21.4.5536},
url = {https://revmaterialeplastice.ro/Articles.asp?ID=5536}
}

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