Lab 3 - 1 Time Effects Creep and Stress Relaxation Laura...

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1 Time Effects – Creep and Stress Relaxation Laura Hughey Georgia Institute of Technology
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2 ABSTRACT
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3 The goal of this lab was to measure the rate of creep and the rate of stress relaxation of a single- filament yarn sample. Creep is defined as extension with time under a constant load. Stress relaxation is defined as the decay of stress with time under a constant elongation. A weight applied to a yarn sample was used to determine the creep. An Instron tester applied a constant load to a yarn sample to determine the stress relaxation. The rate of creep for the yarn sample was found to be . The stress decay for the yarn sample was found to be . The rate of stress decay was calculated to be . MATERIALS AND EQUIPEMENT Two samples of a 100% brown polyester yarn were used in this lab. A 2.2 kg weight and a ruler were used to test and measure the creep of the yarn. The Instron tester was used with a load cell of capacity 100 N to test the stress relaxation. EXPERIMENTAL PROCEDURE One sample of the yarn was hung from a pipe along the ceiling. The initial length was measured as a basis of comparison. A 2.2 kg weight was hung on the end of the yarn. When the
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This note was uploaded on 09/12/2011 for the course PTFE 2200 taught by Professor Kumar during the Spring '10 term at Georgia Tech.

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Lab 3 - 1 Time Effects Creep and Stress Relaxation Laura...

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