The following during a mild steel test piece of l1.2zmm diateret and 5o mm Jauge Cenyth results were dtained lis Load 18 l12 20 28 24 Eteasion (ma? lool0:02 0.03 004 l005 l006 l008 |0-02/0.0310.04 10-05 |006 008 1. Oraw the (oad extenfion graph and from the graph determine i Strain and stress at elastic limit The modulus of elasticity for the mild steel li The utimate ten sile fest. |v. The Safety factor.
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 2 steps with 2 images
