HECOL370 Lecture Notes - Lecture 10: Elastic Modulus, Linear Density, Ultimate Tensile Strength
14 Sep 2016
School
Department
Course
Professor
Document Summary
From a stress-strain curve, a number of useful mechanical properties can be abstracted. Work of rupture (sometimes called toughness) energy needed to break a bre or yarn. Work = force x displacement or force x distance (n x m) work of rupture is the area under the load-elongation curve. To correct for di erences in the diameter of bres and yarns, work of rupture is divided by linear density x initial length being tested (gauge length) Tenacity is an important property when a textile is exposed to a steady pull. Work of rupture is important when a textile is subjected to a sudden shock or force. Initial modulus (im) sometimes called young"s modulus, or modulus of elasticity. Im = slope of the stress-strain curve at its origin where line is straight. Im = y2-y / x2-x, reported in units of speci c stress n/tex. Im also found from tan alpha where alpha is in radians.
