springs & uses of springs
TRANSCRIPT
SPRINGSPresenting By: Kazi Sazed Salman
ID no: 111-23-130
Spring
A spring is an elastic object used to store mechanical energy. Springs are usually made out of spring steel.
When a spring is compressed or stretched (force applied), then it gets a change in length.i.e., Force or Load α Length of Spring.
Types of Springs
Helical Spring
Conical & Volute Spring
Torsion Spring
Laminated Spring
Belleville or Disc Spring
Special Purpose Spring
Helical Spring
In Helical Spring, the spring wire is coiled in the form of helix.
Compressive Helical Spring Tension Helical Spring
Conical & Volute Spring
Conical & Volute Springs have conical or angular shape.
Conical Spring Volute Spring
Torsion Spring
These types of springs remains in a torsional coil structure.
Helical Torsion Spring Spiral Torsion Spring
Laminated or Leaf Spring
Consists of a number of flat plates held together by clamps & bolts
Laminated Springs
Disc or Belleville Spring
Consists of a number of conical discs held together by a bolt or tube cylinder. Used as washer with bolts.
Disc or Belleville Springs
Special-purpose Spring
Different types & kinds of spring for using in special purposes.
Special-purpose Springs
Special-purpose Spring
Different types & kinds of spring for using in special purposes.
Air SpringsLiquid Springs
Special machine part Spring
Stress in Helical Spring
W= Load or force on springD= Diameter of spring cross-sectiond= Diameter of spring wire
σS2 = Direct Shear Stress = Load / Cross sectional area = 4W/πd2
σS1 = Torsional Shear Stress =πd3
8WD
σS = σS1 ± σS2
πd3
8WD
πd2
4W= ±
d
πd3
8WD= (1± )
2D
(+) for inner edge of the wire(-) for outer edge of the wire
πd3
8WD= (1+ 1/2c) ; [ c = d/2D ]
= K πd3
8WD; [ K = (1+ 1/2c) ]
Total Stress:
Maximum Stress on Spring: (σS)max = K
πd3
8WD
πd2
8Wc= K
Here, K is known as Wahl’s stress factor
Common Uses of Springs
Common Uses of Springs
Common Uses of Springs
Common Uses of Springs
Thank You...
That’s all from me.Hope you have enjoyed.