Poynting, J.H.: Proc. R. Soc. Lond., Ser. A,vol 32, 1909; and vol 36, 1912Chapter 10: Torsion said:In addition to these deformations and stresses, there is some longitudinal strain and stress. A solid circular cylinder wants to lengthen under twist, as shown experimentally by Poynting. In any event, for elastic loading of metallic circular bars, neither longitudinal deformation nor stress is likely to be large enough to have engineering significance.
Torsion force causes a rod to twist, which results in a change in its length. This change is known as the length change of a rod under torsion force.
The length change of a rod under torsion force can be affected by various factors such as the type of material the rod is made of, the magnitude of the torsion force applied, and the length and diameter of the rod.
Yes, the formula for calculating the length change of a rod under torsion force is: ΔL = TL/GJ, where ΔL is the change in length, T is the torsion force applied, L is the length of the rod, G is the shear modulus of the material, and J is the polar moment of inertia of the rod.
The shape of a rod can affect its length change under torsion force as it determines the distribution of stress and strain within the rod. A circular rod, for example, will experience a different length change compared to a rectangular rod under the same torsion force.
Yes, the length change of a rod under torsion force is reversible. This means that when the torsion force is removed, the rod will return to its original length. However, repeated torsion forces can cause permanent deformation in the rod, leading to a permanent change in its length.