47. SPRINGS & FLYWHEEL.pptx - SPRINGS AND FLYWHEEL ES...

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SPRINGSANDFLYWHEELE S M E C H A N I C A L E N G I N E E R I N G R E V I E W
ADDITIONAL PROPERTIES OF MATERIALS1.Fatigue2.Creep3.Impact4.Failure5.Buckling6.Ductile Fracture7.Brittle Fracture8.Residual Stress9.Warping
Springs
CLASSIFICATION OF SPRINGACCORDING TO FORCE APPLICATION1.Push TypeHelical Compression SpringBelleville SpringTorsion Spring: Force acting at the end of thetorque armFlat Spring, such as a cantilever or leaf spring2. Pull TypeHelical extension springTorsion Spring: Force acting at the end of thetorque armFlat Spring, such as a cantilever or leaf springDrawbar spring(special case of thecompression spring)/ Constant force spring3. Radial Torque TypeGarter springElastomeric bandSpring clamp4. Torque TypeTorsion SpringPower Spring
TYPES OF SPRINGHelical Compression SpringHelical Extension SpringDrawbar SpringTorsion SpringLeaf SpringBelleville SpringGarter SpringConstant Force SpringWave Spring
SPRINGSC = spring index
SPRING CORRECTIONFACTORSK = Wahl’s Factor
Wahl Stress Factor __________very rapidly as the spring indexdecreases.
SPRING DEFORMATION,?=8? ?3??? ????=number of active coils
SPRING WORKW = Weighth = heightF = forcek = spring constantm = massv = velocity
BERGSTRASSER FACTOR
1. A helical spring has a mean coil diameter of 1 inch and a wire diameter of1/8 inch. Determine the Bergstrasser factor of the spring.PROBLEM 1
2. A Coiled spring with 1 ¾ in outside diameter is required to work under load of140lb. Wire diameter used is 0.192 in spring with seven active coils, and the endsare to be closed and ground. Determine the safe shearing stress and the unitdeflection. Assume G equal to 12 million psi and mean radius to be 0.779 inches.

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Term
Spring
Professor
Engr. Dalisay L. Sarmiento
Tags
4 480 lbs, MECHANICAL ENGINEERING REVIEW, 0 0155 kg, 0 779 inches

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