# 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 calledDiscussion:

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.

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.

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.

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.

r = Radius.

r = Radius.

Manish said:
9 years ago

Polar modulus and torsional section modulus are both same. Polar modulus should not be confused with polar moment of inertia.

Sai krish said:
1 decade ago

Since j is polar moment of inertia (pi/32)*d^4 so in that clue we can conclude the solution.

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