Tensile testing can someone tell me how to calcualte the true strain, engineerin

Question

Tensile testing

can someone tell me how to calcualte the true strain, engineering strain, true stress and engineering stress of the following data o got from tensile testing machine. I assumed area to be constant during the test

i need to draw the curves of the true and engineeing in excel please

TESTNUM POINTNUM TIME POSIT FORCE EXT Area 5368 1 0.156 -5E-05 347.6111 -0.00138 0.0628 5368 2 0.58 -5E-05 348.3641 0 0.0628 5368 3 0.777 0.0007 363.0201 0.021787 0.0628 5368 4 0.875 0.001375 398.4846 0.041394 0.0628 5368 5 0.975 0.002025 438.6508 0.060276 0.0628 5368 6 1.086 0.002675 477.715 0.079158 0.0628 5368 7 1.175 0.00335 515.8242 0.098766 0.0628 5368 8 1.276 0.004 552.9417 0.117647 0.0628 5368 9 1.374 0.00465 590.1509 0.136529 0.0628 5368 10 1.483 0.0053 625.4869 0.155411 0.0628 5368 11 1.579 0.00595 659.7577 0.174292 0.0628 5368 12 1.678 0.006575 693.257 0.192448 0.0628

Explanation / Answer

Engineering stress: The formula for finding engineering stress = P/A; whrere P is the reading from load dial and A is the initial area. For eg, at time 0.777, the engineering stress = 363.0201/0,0628 = 5780.57

True stress: The formula for finding engineering stress = P/A; whrere P is the reading from load dial and A is the area.at that particular time instant. Since the area is same at all times, Engineering stress = True stress

True strain: The formula for true stain = ln(L2/L1); where L2 is the length at a particular instant of time and L1 length is at the previous instant of time

Engineerig Strain: Engineering Strain is calculated as dL/L1 where L1: initial length of specimen. And final length=L1+dL

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