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NEW 375 Lecture05 - 1 2 3 STRAIN STRENGTH AND STIFFNESS FOR...

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Unformatted text preview: 1 2 3 STRAIN , STRENGTH AND STIFFNESS FOR A SPECIFIC MATERIAL SPECIMENS MADE OF SAME MATERIAL, UNDERGOING TENSILE LOAD. EXAMPLE: CHARACTERISTICS OF TENSILE SPECIMENS: 1. DIFFERENT CROSS-SECTIONAL AREA (A). 2. DIFFERENT LENGTH (L). 1 2 3 RESULT : ELONGATIONS OF THE SPECIMENS FOR THE SAME APPLIED LOAD ARE DIFFERENT. P1=P2=P3 PLOT APPLIED LOAD vs.ELONGATION 1. THE RELATION BETWEEN P AND IS LINEAR . 2 . THE SLOPE OF THE P vs. LINES IS DIFFERENT FOR THE DIFFERENT SPECIMENS. HOW CAN LOAD BE NORMALIZED FOR THE THREE SPECIMENS? A P = LOAD NORMAL STRESS HOW CAN THE ELONGATION BE NORMALIZED FOR THE THREE SPECIMENS? ELONGATION NORMAL STRAIN DEFINITION: = . in . in L IS THERE ANY BASIC UNDERLYING RELATIONSHIP? PLOT STRESS AND STRAIN INSTEAD OF LOAD AND ELONGATION : STRESS: STRAIN: L dL dL dL 2245- = ' A P dA dP 2245 = THE LINES CONVERGE INTO A SINGLE RELATION....
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NEW 375 Lecture05 - 1 2 3 STRAIN STRENGTH AND STIFFNESS FOR...

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