1_ch 02 Mechanical Design budynas_SM_ch02

1_ch 02 Mechanical Design budynas_SM_ch02 -...

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Unformatted text preview: budynas_SM_ch02.qxd 11/22/2006 16:28 FIRST PAGES Page 6 Chapter 2 2-1 From Table A-20 Sut = 470 MPa (68 kpsi), S y = 390 MPa (57 kpsi) Ans. 2-2 From Table A-20 Sut = 620 MPa (90 kpsi), S y = 340 MPa (49.5 kpsi) Ans. 2-3 Comparison of yield strengths: Sut of G10 500 HR is Syt of SAE1020 CD is 620 = 1.32 times larger than SAE1020 CD 470 390 = 1.15 times larger than G10500 HR 340 Ans. Ans. From Table A-20, the ductilities (reduction in areas) show, SAE1020 CD is 40 = 1.14 times larger than G10500 35 Ans. The stiffness values of these materials are identical Ans. Sut MPa (kpsi) Sy MPa (kpsi) Table A-20 Ductility R% SAE1020 CD 470(68) UNS10500 HR 620(90) 390 (57) 340(495) Table A-5 Stiffness GPa (Mpsi) 40 35 207(30) 207(30) 2-4 From Table A-21 ¯ 1040 Q&T S y = 593 (86) MPa (kpsi) at 205◦C (400◦F) Ans. 2-5 From Table A-21 1040 Q&T R = 65% at 650◦C (1200◦F) Ans. 2-6 Using Table A-5, the specific strengths are: Sy 39.5(103 ) = = 1.40(105 ) in UNS G10350 HR steel: W 0.282 2024 T4 aluminum: Sy 43(103 ) = = 4.39(105 ) in W 0.098 Ti-6Al-4V titanium: Sy 140(103 ) = = 8.75(105 ) in W 0.16 ASTM 30 gray cast iron has no yield strength. Ans. Ans. Ans. Ans. ...
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This note was uploaded on 12/13/2011 for the course EML 3013 taught by Professor Shingley during the Fall '11 term at UNF.

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