BIOE-257 Lecture Notes - Lecture 3: Elastic Modulus, Modulus Guitars, Biomaterial
6 Feb 2019
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Important mechanical properties from a tensile test: young"s modulus: this is the slope of the linear portion of the stress-strain curve, it is usually specific to each material; a constant, known value. Hooke"s law : =e , where e is the modulus of elasticity (typically in gpa) E is a proportionality constant, and therefore applies when the plot of stress vs. strain is linear. The greater the e, the stiffer the material. The material will return to its original shape after the material is unloaded( like a rubber band). The stress is linearly proportional to the strain in this region. sigma : stress(psi) E : elastic modulus (young"s modulus) (psi) epsilon : strain (in/in) Point 2 : yield strength : a point where permanent deformation occurs. ( if it is passed, the material will no longer return to its original length. )
