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Title: Elastic moduli and the bending properties of textile materials
Author: Elder, Hamish M.
Awarding Body: University of Glasgow
Current Institution: University of Glasgow
Date of Award: 1964
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Values for the tensile, bending, and compressive moduli of nylon 6, nylon 66, polyethylene, polypropylene, Saran and Terylene fibres have been obtained on an Instron Tensile Testing Instrument, Model TM. It has been shown that the moduli are similar in value for a specific material. The effect of variation in a number of experimental conditions has been investigated and found to be similar for each modulus of a material. In particular the effects of temperature and humidity on the bending modulus have been checked by experiment using a Cambridge Extensometer mounter over a Gallenkemp Conditioning Over. The order of change of value even within the limits of general atmospheric fluctuations has been shown to be considerable, and the modulus may decrease until at high temperatures and humidities the value may be less than 25 per cent of the value at low temperatures and humidities. The relative decrease depends on whether the material is thermoplastic and hydrophilic or hydrophobic, and the pattern of change was closely akin to the results expected in tensile values under similar conditions. The effects of time, history, type of fibre, and test method, have been considered in relation to the present experiments and the work of other authors. The use of strain moduli to forecast the resistance of a fibre to bending where strains are outwith the immediate elastic region has been suggested. It has been shown that reasonable up to a 5% level of strain, and the use of such strain moduli to indicate stiffness has been discussed with additional reference to final, or breaking strain, stiffness. Experience of bending test methods has shown the need for an instrument capable of measuring accurately loads of the order of 1 x 10.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available