GATE ME
Machine Design
Fatigue Strength
Previous Years Questions

A machine component made of a ductile material is subjected to a variable loading with $${\sigma _{\min }} = - 50MPa$$ and $${\sigma _{\max }} = 50MP... For the given fluctuating fatigue load, the values of stress amplitude and stress ratio are respectively. ... Which one of the following is the most conservative fatigue failure criterion? In a structure subjected to fatigue loading, the minimum and maximum stresses developed in a cycle are$$200MPa$$and$$400MPa$$respectively. The... A rotating steel shaft is supported at the ends. It is subjected to a point load at the center. The maximum bending stress developed is$$100 MPa.$$I... In terms of theoretical stress concentration factor$$\left( {{k_t}} \right)$$and fatigue stress concentration factor$$\left( {{k_f}} \right),$$th... The$$S$$-$$N$$curve for steel becomes asymptotic nearly at A static load is mounted at the center of a shaft rotating at uniform angular velocity. This shaft will be designed for The yield strength of a steel shaft is twice its endurance limit. Which of the following torque fluctuations represent the most critical situation acc... Fatigue strength of a rod subjected to cyclic axial force is less than that of a rotating beam of the same dimensions subjected to steady lateral forc... In a shaft with a transverse hole, as the hole to the shaft diameter ratio ___________ (increases / decreases), the torsional stress concentration fac... The process of shot peening increases the fatigue life of steel springs mainly because it results in Stress concentration in a machine component of a ductile material is not so harmful as it is in a brittle material because ## Marks 2 A machine element has an ultimate strength$$\left( {{\sigma _u}} \right)$$of$$600\,\,N/m{m^2},$$and endurance limit$$250\,N/m{m^2}.$$The ... In a structural member under fatigue loading, the minimum and maximum stresses developed at the critical point are$$50MPa$$and$$150MPa,$$... A bar is subjected to fluctuating tensile load from$$20kN$$to$$100kN.$$The material has yield strength of$$240MPa$$and endurance ... A forged steel link with uniform diameter of$$30mm$$at the centre is subjected to an axial force that varies from$$40kN$$in compression to$$160kN...
A thin spherical pressure vessel of $$200mm$$ diameter and $$1mm$$ thickness is subjected to an internal pressure varying from $$4$$ to $$8MPa.$$ Assu...
A cylindrical shafts is subjected to an alternating stress of $$100MPa.$$ Fatigue strength to sustain $$1000$$ cycles is $$490MPa.$$ If the corrected ...
A ductile material having an endurance limit of $$196$$ $$N/m{m^2}$$ and the yield point at $$294$$ $$N/m{m^2}$$ is stressed under variable load. The ...
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