Torsional Formula Video Lecture | Strength of Materials (SOM) - Mechanical Engineering

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FAQs on Torsional Formula Video Lecture - Strength of Materials (SOM) - Mechanical Engineering

1. What is the torsional formula?
Ans. The torsional formula is a mathematical equation used to calculate the stress and strain in a structural member subjected to torsional forces. It relates the torque applied to a member, its length, and its cross-sectional properties to the resulting stress and strain.
2. How is the torsional formula derived?
Ans. The torsional formula is derived by considering the equilibrium of a small element within the structural member, assuming the material behaves elastically. By applying the principles of static equilibrium and using the basic concepts of mechanics of materials, the formula is derived.
3. What are the variables in the torsional formula?
Ans. The torsional formula includes several variables, such as the applied torque (T), the polar moment of inertia (J) of the cross-sectional shape, the radius (r) at which the torque is applied, and the length (L) of the member. These variables are used to determine the stress (τ) and the angle of twist (θ) experienced by the member.
4. How is the torsional formula used in engineering design?
Ans. The torsional formula is widely used in engineering design to analyze and predict the behavior of structural members under torsional loading. It helps engineers determine the maximum allowable torque, the required cross-sectional dimensions, and the selection of suitable materials to ensure the structural integrity and safety of the member.
5. Are there any limitations to the torsional formula?
Ans. Yes, the torsional formula has some limitations. It assumes linear elastic behavior of the material, neglecting any plastic deformation. It also assumes a circular cross-section and uniform torsional loading. When these assumptions do not hold, more advanced techniques, such as finite element analysis, may be required for accurate analysis and design.

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