Two wooden planks each in thick and 1 / 2 in. thick and 9 in. wide, are joined by the dry mortise joint shown. knowing that the wood used shears off along its grain when the average shearing stress reaches 1.20 ksi, determine the magnitude p of the axial load that will cause the joint to fail. two wooden members of uniform rectangular cross section of sides a = 100 mm and b = 60 mm are joined by a simple glued joint as shown. knowing that the ultimate stresses for the joint are sigma u = 1.26 mpa in tension and tau u = 1.50 mpa in shear and that p = 6 kn, determine the factor of safety for the joint when (a) alpha = 20degree, (b) 35degree, (c) alpha = 45degree. for each of these values of alpha, also determine whether the joint will fail in tension or in shear if p is increased until rupture occurs.

Ashielded metal arc-welding operation is accomplished in a work cell by a fitter and a welder. the fitter takes 5.5 min to load components into the welding fixture at the beginning of the work cycle, and 1.5 min to unload the completed weldment at the end of the cycle. the total ength of the weld seams 1200 mm, and the travel speed used by the welder averages 300 mm/min. every 600 mm of seam length, the welding stick must be changed, which takes 0.8 min. while the fitter is working, the welder is idle (resting): and while the welder is working the fitter is idle. (a) determine the average arc-on time as a fraction of the work cycle time. (b) how much improvement in arc-on time would result if the welder used flux-cored arc welding (manually operated), given that the spool of weld wire must be changed every 10 weldments, and it takes the welder 5.0 min to accomplish the change? (c) what are the production rates for these two cases (weldments completed per hour)? attach your work and solutions.