"TENSION, COMPRESSION, SHEAR, ELASTICITY AND YOUNG'S MODULUS. Below the elastic limit, or maximum stress that can be applied to an object without causing permanent deformation, a tension or compressive force FORCE actson an object of initial length LENGTH0 and cross-sectional area AREACROS to change its length by DELTALEN. Young's modulus YOUNGMOD is the ratio: (longitudinal stress)/(longitudinal strain) and it has the dimensions of a stress (N/m^2 or Pascal Pa and pound/in^2). ______________________ A=cross-sec area /____________________ /| | OBJECT |A| ---> |_____________________|/ FORCE |---LENGTH0--------|--| DELTA LENGTH *** Answers to problem *** (c) Copyright PCSCC, Inc., 1993 Set AREACROS=.02, DELTALEN=.1, FORCE=200 and LENGTH0=10*12 or 120 in. (a) STRESS= 10000 or 10^4 lbs/in^2. (b) STRAIN=8.33e-4 or 833 ppm and (c) YOUNGSMOD=1.2e7lbs/in^2. ||A 10 ft. 0.02 in^2 diameter copper wires is stretched 0.10 in. by the force of a 200 lb lead weight. (a) Find the stress on the wire . (b) Findthe resulting strain. (c) Find Young's modulus for the wire material. Type comma key to see answers. Type (F2) to return to helpfile."
