Determine the number of leaves and initial curvature, Mechanical Engineering

Determine the number of leaves and initial curvature:

A leaf spring with a span of 1.40 m consist width and thickness of leaves to be 100 mm and 12 mm respectively. The maximum bending stress is equal to 150 N/mm2 and the spring should absorb 125000 N-mm when straightened. Determine the number of leaves and initial curvature. Take E = 200 GPa.

Solution

d = 1400 mm

b = 100 mm

t = 12 mm

σb = 150 N/mm2

U = 125000 N-mm

n =?

R0 =?

E = 200 × 103 N/mm2

σ  =  3Wl  /2 nbt2

⇒         150 = 3W × 1400 / 2 n (100) (12)2

∴          W = 1029 n      --------------- (1)

Δ= 3W l 3 / 8 nE b t 3  = 3 (1029 n) (1400)3 / 8 n (200 × 103 ) (100) (12)3  = 30.6 mm

U = (½) W Δ

⇒         125000 = 1029 n × (30.6/2)

∴          n = 79; 8

R0 = l 2 / 8 Δ = (1400)2 /8 × 30.6 = 8007 mm

Posted Date: 1/21/2013 2:01:34 AM | Location : United States







Related Discussions:- Determine the number of leaves and initial curvature, Assignment Help, Ask Question on Determine the number of leaves and initial curvature, Get Answer, Expert's Help, Determine the number of leaves and initial curvature Discussions

Write discussion on Determine the number of leaves and initial curvature
Your posts are moderated
Related Questions
whta is tortion

Interpoles or commutating poles Interpoles are ?xed to the frame in among main poles. They are used for sparkless commutation, i.e, to improve commutation.

System of loads -  Beam: Build the SFD & BMD for 10 m span simply supported beam subjected to a system of loads as illustrated in Figure . Figure Taking moment a

Cell-decomposition In cell-decomposition, an object can be represented as the sum of cells into which it can be decomposed. Each cell-decomposition system defines a set of prim

Q. Basic type of Polymer? Polymer can be divided into three broad divisions: plastics, fibers, and elastomers. Synthetic resins are usually referred to as plastics. Plastic der

Q. Hot Service Insluation Thicknesses? Hot Service Insluation Thicknesses are specified based on the following design criteria: • Average Annual Climatic Conditions:

Ratio of applied stress and yield stress: What should be the ratio of applied stress, s, to yield stress s Y in a large thin plate so that plastic spread along lint of crack

The processing of payroll for the 10,000 workers in a large rm can either be done using 1 hour of computer time (signed by K) and no clerks or with 10 hours of clerical time (sign

SERVICE INDUSTRY GROWTH: The service industry is growing very fast in today's world market scenario. In Indian context, we can see the impact of service sector growth upon (GDP) g