MOITAMRORE 10.7 THEORIES OF FAILURE 10-75. The components of plane stess at a critical point on an A-36 steel shell are shown. Determine if failure (yielding) has occurred on the basis of the maximum-shear-stress theory. of the basis loste s tol theory. obor 2 si di roue 2012 onslą of batsidus ei leitum om ni snimetab 25.0=o bas 916 29225112 of gnibroson griblory sano gioning 60 MPa MPa indi o tobutiam odi vioadrons nou Brad 40 MPa 9 vio2 18-01 70 MPaT $8-01 OJUE ME to Shilbhl 1852 me ll snimation admom 101 botoolse od nso tadi vosili 220112-ode-mumixum noinolaib-mumxam Probs. 10-75/76 do svloč If the A-36 steel pipe has outer and inner diameters tively determine the factor of ding
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.
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