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1_ch 02 Mechanical Design budynas_SM_ch02

1_ch 02 Mechanical Design budynas_SM_ch02 -...

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2-1 From Table A-20 S ut = 470 MPa (68 kpsi), S y = 390 MPa (57 kpsi) Ans. 2-2 From Table A-20 S ut = 620 MPa (90 kpsi), S y = 340 MPa (49 . 5 kpsi) Ans. 2-3 Comparison of yield strengths: S ut of G10500 HR is 620 470 = 1 . 32 times larger than SAE1020 CD Ans. S yt of SAE1020 CD is 390 340 = 1 . 15 times larger than G10500 HR Ans. From Table A-20, the ductilities (reduction in areas) show, SAE1020 CD is 40 35 = 1 . 14 times larger than G10500 Ans. The stiffness values of these materials are identical Ans. Table A-20 Table A-5 S ut S y Ductility Stiffness MPa (kpsi) MPa (kpsi) R % GPa (Mpsi) SAE1020 CD 470(68) 390 (57) 40 207(30) UNS10500 HR 620(90)
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