A 1/2-in-dia UNC, class 2 bolt with rolled threads is preloaded to 80% of its proof strength when clamping a 3-in-thick sandwich of solid steel. A static 1000-lb external load is applied. Part A Find the safety factor against static yielding. Express your answer using three significant figures. Part B Find the safety factor against joint separation. Express your answer using three significant figures.

! Required information A rectangular bar is cut from an AISI 1020 cold-drawn steel flat. The bar is 2.500 in wide by 4/8 in thick and has a 0.500-in-dia. hole drilled through the center as depicted in Table A-15-1. The bar is concentrically loaded in push-pull fatigue by axial forces Fa, uniformly distributed across the width. Using a design factor of na = 2, estimate the largest force Fã that can be applied ignoring column action. Determine the endurance limit for this material as well as the value after correction for surface finish, sizing, and loading. The endurance limit for the material is kpsi. The endurance limit after correction is kpsi.

A rectangular bar is cut from an AISI 1020 cold-drawn steel flat. The bar is 2.500 in wide by 4/8 in thick and has a 0.500-in-dia. hole drilled through the center as depicted in Table A-15–1. The bar is concentrically loaded in push-pull fatigue by axial forces Fa, uniformly distributed across the width. Using a design factor of na = 2, estimate the largest force Fa that can be applied ignoring column action. What are the values of the theoretical stress-concentration factor, the notch sensitivity, and the fatigue stress-concentration factor? The value of the theoretical stress-concentration factor is The value of the notch sensitivity is (Round the final answer to three decimal places.) The value of the fatigue stress-concentration factor is (Round the final answer to three decimal places.)

9. A M42x4.5 Grade 10.9 bolt 60 cm in length is loaded to 85% of its proof strength. The bolt is not lubricated, though traces of lubrication may be present. What is the required torque, deformation, and torque angle? The modulus of elasticity is E= 207 x 10' N/m. Use 830 MPa as proof strength.