Total 7 Questions have been asked from Design for Static and Dynamic Loading topic of Machine Design subject in previous GATE papers. Average marks 1.71.

A bar is subjected to a combination of a steady load of 60 kN and a load fluctuating between -10 kN and 90 kN. The corrected endurance limit of the bar is 150 MPa, the yield strength of the material is 480 MPa and the ultimate strength of the material is 600 MPa. The bar cross-section is square with side $a$. If the factor of safety is 2, the value of $a$ (in mm), according to the modified Goodman’s criterion, is ________ (correct to two decimal places).

The principle stresses at a point in a critical section of a machine component are ${\sigma }_{1}$=60 MPa, ${\sigma }_{2}$=5 MPa and ${\sigma }_{3}$=-40 MPa. For the material of the component, the tensile yield strength is ${\sigma }_{y}$=200 MPa. According to the maximum shear theory, the factor of safety is

The stress-strain curve for mild steel is shown in the figure given below. Choose the correct option referring to both figure and table.

 Point on the graph Description of the point P 1.Upper Yield Point Q 2. Ultimate Tensile Strength R 3. Proportionality Limit S 4. Elastic Limit T 5. Lower Yield Point U 6. Failure

A bar is subjected to fluctuating tensile load from 20 kN to 100 kN. The material has yield strength of 240 MPa and endurance limit in reversed bending is 160 MPa. According to the Soderberg principle, the area of cross-section in mm2 of the bar for a factor of safety of 2 is

Match the following criteria of material failure, under biaxial stresses ${\sigma }_{1}$ and ${\sigma }_{2}$ and yield stress ${\sigma }_{y}$, with their corresponding graphic representations :