Question

please solve #7.

6. A tension test specimen of a certain material has a diameter of 0.5 in and gage marks set 2 in The load versus deflection results of a tension test are shown below where p = 16,000 lb and 0.007 in. Young's modulus for the material is best given by a 23.3 x 10 psi d=0.5in b. 5.82 x 10 psi 2.29 x 10psi d. 73.1 x 10º psi P] Fractures 56 38 672 7. The modulus of toughness for the material of Problem 6 is best given by a, 713 psi b. 143 psi c. 280 psi d. 56.0 psi -

Answer 1

Stress s is directly po Fractus is directly proror- - tional to Strain with in elastic Mimi rdee E = 2 SC 38*5 16000 os p* - 16000 p* = 16000 lb g* = 0.007 A = I (05) - 0.196 mm a loro = 8149 x * 1b/in (psi) et = 0.007 = 35163 J = 81.0 35 X703 Young's modules of material & E = 23.3 X 100 psi) Answer ; Option: (a) area of 7 modulus of toughness is defined as total curve under stress - Strain curve ve area of ( ou noc + Ole Bcoe) = (4 * Aex Bc) + (BCXCD)

py = { 1600 X 0.007] + 1600x 0-07 x 27 U = 280 PSI Answer ; option (C)