Springs

IMP Questions:

Q.1: Define Springs and its types and applications.

Q.2: Design process of Helical and leaf springs and Numerical.

Q.3: Explain Nipping and Surging in spring.

Q.4: Define variable stress, Fatigue, Endurance limit.

Q.5: Explain SN Curve in detail.

Q.6: Explain Soderberg, Gerber and Goodman equations.

Q.7: Numerical of Finite and In finite Life.

 

Helical and Leaf Spring Notes:

Spring Notes

Leaf Spring Introduction

Leaf Spring Basic

Assignment 2.2:( Leaf Spring)

Question for Practical File:  (for AU and MEB Students)

Practical 2: Leaf Spring (2 Questions)

Q.1 a Semi elliptic multi leaf spring is used for the suspension of the rear axle of a truck. It consists of two extra full length leaves and ten graduated length leaves including the master leaf. The center to center distance between the spring eye is 1.2 m. Bending stress = 600 MPa; E = 207000 MPa. The Spring is designed for a maximum force of 30 kN. The leaves are prestressed so as to equalize in all leaves. Assume Standard width 60 mm; Determine:

(i) Cross section of leaves; and (60 mm and 11.8 mm)

(ii) Deflection (73.28 mm)

Q.2: A Semi eqlliptical laminated spring is made of 50 mm wide and 3 mm thick plates. The length between the supports is 650 mm and the width of the band is 60 mm. The spring has two full length leaves and five graduated leaves. If the spring carries a central load of 1600 N, Find:

1. Maximum stress in full length and graduated leaves for an initial condition of no stress in the leaves. The maximum stress if the initial stress is provided to cause equal stress when loaded
2. The deflection

Solution: Given: b = 50 mm; t = 3 mm; 2L1 = 650 mm; l = 60 mm; nf = 2; ng = 5; W = 1600 N.

n = nf+ng = 7

2L = 2L1-l = 590 mm

1. σf = 18 W L / b*t*t (2*ng+3nf) = 1180 MPa (ANS)

σg =  σf *2/3 = 786.6 MPa (ANS)

2.  σ = 6*W*L/ n*b*t*t    = 899.05 MPa

3. δ = 12* W *L*L*L/ E*b*t*t*t * (2*ng+3nf)  = 108.66 mm

Take E = 210

Practical 1: Helical Spring (3 Questions)

Assignment 2.1 (Helical Spring):

Practice Questions of Helical Spring:

Result of MST 1:

MST 1 Marks MEB MD 1

AU 4 Sem MD-1 MST-1 Result

Solution of MST-I Feb 2018

Solution BTME 404 Machine Design I MST I

Scheme & Syllabus of Machine Design I (SVVV, University)

Scheme for B Tech (4th Sem ) in Automobile Engineering

Syllabus for B Tech (4th Sem ) in Automobile Engineering

 

Education Material from You Tube:

Terminologies Used in Springs:

Types of Springs:

Disc Spring:

Design of Helical Spring:

Torsional Spring Design:

Leaf Spring in Hindi