Acenter-cracked panel with an initial crack length of 0.010 mm is subjected to a tensile cyclic stress between 25 and 125 mpa for 35 cycles. the panel is then subjected to a tensile cycle stress between 0 and 250 mpa. how many of the larger stress amplitude cycles can be sustained before failure? the material has a fracture toughness of 25 mpa√m and material constants n = 3.1 and c = 1.8 x 10-10 for these units.

Afour cylinder four-stroke in-line engine has a stroke of 160mm, connecting rod length of 150mm, a reciprocating mass of 3kg and its firing order is 1-3-4-2. the spacing between cylinders is 100mm. i. show that the engine is in balance with regard to the primary inertia forces and primary 3. a and secondary inertia couples. li determine the out of balance secondary inertia force ii. propose ways of balancing this out of balance force and discuss the challenges that will arise

Assuming compressible flow of air and that the measurements are done at flagstaff a pitot static tube that gives the difference of total and static pressure measures 0.35 m of mercury. what is the velocity of air? assume the temperature to be 300k. (submit your excel or matlab calculation sheet)

Select any two (2) areas of applications of chain-drive. (clo4) a)-permanent lubrication necessary b)-hydraulic forklift truck operation c)-rigging and heavy moving materials d)-relatively high maintenance costs e)-costlier than belt drives