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Unformatted text preview: f. .2% off set Yield strength g. young’s modulous hooke’s law constant of proportionality. 2. a. i. 345*130 = 44850 Newtons ii. 345/103,000 = .00335= strain = dL/Lo Lo=76mm .2546=max stretch b. 345/110000= .00218*380=.829<1.9 It is not possible to calculate the load that is necessary to cause this deformation, as this deformation lies in the plastic region of the material. 3. Modulus of elasticity = 200GPa Yield strength(.002) = 750MPa (about) 12.8^2/4*pi= 128.68mm^2=A Tensile strength= Ys(.002)*A=F= 1250MPa %EL=5.84/50.8*100%= 11.2% Modulus of resilience=1/2* σ y* ε y= .5(200)(5.842/50.8)= 1.4E6J/m^3 b. log σ T = log K + n log ε T n=4.2859 K= σ T/( ε T^n) = 137468770MPa 4. Area= 19*3.2=60.8mm^2 F/A= σ = 1809.2MPa elastic strain= .008 plastic strain= .011 .008*(610)+610= 616.7mm 5. (a) elastic (b) viscous (c) viscoelastic(d) viscoelastic...
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- Spring '10
- yield strength, elastic strain