An 8-cm-square bar of steel is found to contain a1-mm corner crack, oriented perpendicular to the length ofthe bar. If an axial stress is applied from 0 to 420 MPa at afrequency of once every 10 minutes, how long will it take forthe rod to fracture? The properties of the bar are:KIC = 90 MPa √m , σys = 1500 MPa, and the crack growthrelation is da/dN = 2 x 10-37 ΔK4, with da/dN and ΔKbeing given in units of m/cycle and Pa √m , respectively

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Axial Load

When a bar of the uniform cross-section is acted by a load, such that the load acts along the longitudinal axis of the bar, such kinds of loadings are known as axial loadings. In general terms, a load is an external force acting on a component. An axial load acts perpendicular to the geometric cross-section of the component. Based on the direction of the application of the load, an axial load can be tensile or compressive. The analysis of bodies under the action of axial loads is generally studied under the branch of mechanics, known as statics.