Question 2) in the system given in the figure, a distributed load of w = 88 kN / m affects the AB rod of length L = 4.1 m. The angle that the bar BC makes with the horizontal is also = 56 °. The allowable normal stress for the BC bar is o m = 212 MPa , and the allowable shear stress for pins at points A and B is T m = 70 MPa . The BC bar has a rectangular cross section and the side length a of the section is given as a = 28 mm . According to this; C |-b- a 0° A L B w kN/m Question 2-A) bar section . Find the smallest side length b required for the BC Nrite your result in mm. Response: Question 2-B) The connection type at point B is given in the figure next to it. Find the smallest diameter required for pin B accordingly . ( Write your result in mm .)
Design Against Fluctuating Loads
Machine elements are subjected to varieties of loads, some components are subjected to static loads, while some machine components are subjected to fluctuating loads, whose load magnitude tends to fluctuate. The components of a machine, when rotating at a high speed, are subjected to a high degree of load, which fluctuates from a high value to a low value. For the machine elements under the action of static loads, static failure theories are applied to know the safe and hazardous working conditions and regions. However, most of the machine elements are subjected to variable or fluctuating stresses, due to the nature of load that fluctuates from high magnitude to low magnitude. Also, the nature of the loads is repetitive. For instance, shafts, bearings, cams and followers, and so on.
Design Against Fluctuating Load
Stress is defined as force per unit area. When there is localization of huge stresses in mechanical components, due to irregularities present in components and sudden changes in cross-section is known as stress concentration. For example, groves, keyways, screw threads, oil holes, splines etc. are irregularities.
Step by step
Solved in 5 steps
