# Mechanical Engineering - Strength of Materials - Discussion

Discussion Forum : Strength of Materials - Section 1 (Q.No. 21)
21.
In the torsion equation the term J/R is called
shear modulus
section modulus
polar modulus
none of these
Explanation:
No answer description is available. Let's discuss.
Discussion:
13 comments Page 1 of 2.

YASEEN said:   3 years ago
J is polar moment of inertia wher its measured in mtr^4.

AJITHKUMAR said:   4 years ago
It's not J/R.

It is tou/R.
(2)

Satish Horil said:   5 years ago
@Vinod Uv.

Torsional rigidity is the amount of resistance a cross-section has against torsional deformation, it is termed as GIp.

Ambikesh said:   6 years ago
J/r is polar section modulus.

J is polar modulus,
I is a moment of inertia,
Z is section modulus.
(1)

Lalit choudhary said:   6 years ago
J is the Polar moment of inertia, hence J/R is the Polar modulus.

Ranjith babu said:   7 years ago
Only j is the polar moment of innertia.

Vinod uv said:   7 years ago
Torsional rigidity means what?

Navik singh said:   8 years ago
j = Polar moment of inertia.