Answer Happy

2. The sketch shows a round bar with a groove loaded in bending. The material is annealed steel, with an as-machined groove, and is to be designed with a reliability of 99%. (Note: This is a large shaft.) Kc = 1.4 (a) What is the endurance limit of this specimen? Se = be les ter in se (b) Estimate the safety factor using the Goodman line if the moment varies from -2000 Nm to +3630 Nm. AIST -> Sy = 3 sompa - = r = 3 mm Sut = 520 min M 110 mm 100 mm M se = 5 Su =260
3. The hip implant shown has a ball diameter of 50.00 mm. The arc of the cup is 160° as shown. It is desired to make certain that the contact patch remains within 30° to make sure the ball doesn't 50 encounter any edge loading from the hemispherical cup during use. The applied load is a N, and the ball and cup are made of cobalt-chrome alloy (E = 258 GPa, v=0.3), and are thick enough to use Hertzian contact approaches. (a) Determine the cup's internal radius to make certain that the patch contact arc is 30° as shown. Note: the circumference of a circle is atd. (b) What is the maximum contact pressure in this case? E E 258 10" 1- 2500 N 35 E =283.51 LLL 115 Lo Contact patch -30° Ś px ,oodsm 210 (2500) ke di 6 (mana DxD