Mechanical Engineering - Strength of Materials - Discussion
Discussion Forum : Strength of Materials - Section 9 (Q.No. 6)
6.
A closely-coiled helical spring is cut into two halves. The stiffness of the resulting spring will be
Discussion:
11 comments Page 1 of 2.
Hari said:
1 decade ago
STIFFNESS OF SPRING = [(G*d)/(8* C^3 * N)].
Where N - No.of coils.
As you can see stiffness is inversely proportional to No of coils. When you cut the spring into half the stiffness will get doubled.
Where N - No.of coils.
As you can see stiffness is inversely proportional to No of coils. When you cut the spring into half the stiffness will get doubled.
Amit said:
1 decade ago
Concept is correct but formula used is wrong.
Correct formula is [(G.d^4)/(64.R^3.n)].
Correct formula is [(G.d^4)/(64.R^3.n)].
Saurabh shukla said:
10 years ago
Both formula are same dear C = D/d.
Dhavalo said:
9 years ago
Yes, Both are same. Agree @Shukla.
Crdmistry said:
8 years ago
Cd^4 / 8 D^3 n this formula also A correct first one is wrong.
SHEKHAR said:
7 years ago
But if, the stiffness of a material is measured in terms of Young's modulus which itself is a materialistic property (and remains same for a material) then how the stiffness varies by varying the length?
Please explain.
Please explain.
Santosh Naganur said:
7 years ago
@Shekhar.
Obviously, the young's Modulus is same for a material but there is a two parts of same material therefore resultant stiffness will be k+k=2K.
Obviously, the young's Modulus is same for a material but there is a two parts of same material therefore resultant stiffness will be k+k=2K.
Murali said:
6 years ago
(G.d^4)/64R^3n is the formula for stiffness. if n becomes half stiffness becomes 2(Gd^4)/(64R^3n). It means stiffness doubled.
Ani said:
5 years ago
@Santosh.
If the springs are used in parallel connection then what will be the stiffness?
If the springs are used in parallel connection then what will be the stiffness?
Jimit said:
5 years ago
N = n/2 so that cd^4/8D^3(n/2) = 2(cd^4/8D^3n) = 2K.
So, the stiffness is double.
So, the stiffness is double.
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