Next Article in Journal
Reinforcement of Rubber Magnetic Composites with Zinc Salts of Acrylic and Methacrylic Acids
Previous Article in Journal
ZnO Nanorods with High Photocatalytic and Antibacterial Activity under Solar Light Irradiation
Article

Comparison of Mechanical Properties of Natural Gut and Synthetic Polymer Harp Strings

by 1,*,† and 2,†
1
The Old Forge, Burnt House Lane, Battisford, Suffolk IP14 2ND, UK
2
Engineering Department, Cambridge University, Trumpington St, Cambridge CB2 1PZ, UK
*
Author to whom correspondence should be addressed.
The authors contributed equally to this work.
Materials 2018, 11(11), 2160; https://doi.org/10.3390/ma11112160
Received: 11 October 2018 / Revised: 25 October 2018 / Accepted: 29 October 2018 / Published: 1 November 2018
The long-term mechanical behaviour of a number of fluorocarbon and gut harp strings has been examined, and the results compared with a previous study of rectified nylon strings. The stretching behaviour of the three materials was studied via different measures of the Young’s modulus; with test time scales on the order of weeks, minutes, and milliseconds. The strings were subjected to cyclic variations in temperature, enabling various aspects of their thermal behaviour to be investigated. The effects of humidity changes on gut strings were also examined. The behaviour of the fluorocarbon strings was found to be similar in many ways to that of the nylon strings, despite their different chemical formulation and significantly higher density. In particular, the faster measures of Young’s modulus were found to show an almost identical strong variation with the applied stress; while the thermal behaviour of both materials was largely determined by the balance between opposing effects associated with thermal contraction and thermal variations in the Young’s modulus. The gut strings showed some similarities of behaviour to the synthetic materials, but also major differences. All three measures of the Young’s modulus remained constant as the applied stress was increased. The gut strings were far more sensitive to changes in humidity than the synthetic materials, although some of the results, especially the thermal tuning sensitivity of the strings when held at constant length, displayed remarkable stability under changing humidity. The observed behaviour suggests very strongly that there is significant coupling between humidity-related changes in the linear density of a gut string and complementary changes in its tension. View Full-Text
Keywords: polymer; nylon; fluorocarbon; gut; string; tuning; harp polymer; nylon; fluorocarbon; gut; string; tuning; harp
Show Figures

Figure 1

MDPI and ACS Style

Lynch-Aird, N.; Woodhouse, J. Comparison of Mechanical Properties of Natural Gut and Synthetic Polymer Harp Strings. Materials 2018, 11, 2160. https://doi.org/10.3390/ma11112160

AMA Style

Lynch-Aird N, Woodhouse J. Comparison of Mechanical Properties of Natural Gut and Synthetic Polymer Harp Strings. Materials. 2018; 11(11):2160. https://doi.org/10.3390/ma11112160

Chicago/Turabian Style

Lynch-Aird, Nicolas, and Jim Woodhouse. 2018. "Comparison of Mechanical Properties of Natural Gut and Synthetic Polymer Harp Strings" Materials 11, no. 11: 2160. https://doi.org/10.3390/ma11112160

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop