Evaluate young modulus of elasticity - ultimate stress, Mechanical Engineering

Assignment Help:

Evaluate Young modulus of elasticity - Ultimate stress:

Q: The following observations were made during tensile test on mild steel specimen 40 mm in diameter and 200 mm long. Elongation with 40 kN load (within the limit of proportionality), L = 0.0304 mm

Yield load =161 KN Maximum load = 242 KN

Length of specimen at fracture = 249 mm

Determine:

(i) Young's modulus of elasticity

(ii) Yield point stress

(iii) Ultimate stress

(iv) Percentage elongation.

Sol.: (i) Young's modulus of elasticity E: Stress,     σ= P/A

= 40/[ ? /4(0.04)2]   

= 3.18 × 104  kN/m2

Strain, e =   δL/L =   0.0304/200   = 0.000152

E = stress/ strain = 3.18 × 104/0.000152

= 2.09 × 10kN/m2                                                                                              .......ANS

(ii) Yield point stress:

Yield point stress = yield point load/ Cross sectional area

= 161/[ ? /4(0.04)2]

= 12.8 × 10kN/m2                                                                                              .......ANS

(iii) Ultimate stress:

Ultimate stress = maximum load/ Cross sectional area

= 242/[? /4(0.04)2]

= 19.2 × 10kN/m2                                                                                             .......ANS

(iv) Percentage elongation:

Percentage elongation = (length of specimen at fracture - original length)/ Original length

= (249-200)/200

= 0.245 = 24.5%                                                                   .......ANS

 


Related Discussions:- Evaluate young modulus of elasticity - ultimate stress

What are the functions of lubrication system, (a) What are the functions of...

(a) What are the functions of lubrication system? (b) Define the working of lubrication system used for internal parts of engine. (c) What is chasis lubrication system? Descr

Basic components of engine , Basic Components of Engine: The major compone...

Basic Components of Engine: The major components of the engine and their functions are briefly given hereunder. Figure shows a cut model of motorcycle engine, where various intern

Lubrication system , Lubrication System: This is an arrangement that consi...

Lubrication System: This is an arrangement that consists of oil pump, oil sump, oil lines and lubricant. The lubricant is meant to lubricate the engine moving parts and it also cl

Order quantity and reorder point, Example: Order Quantity and Reorder Point...

Example: Order Quantity and Reorder Point: Daily demand for a particular product manufactured by ABC company is distributed normally with a mean of 30 and standard deviation o

Determine the reactions at the points of supports, Two identical rollers, e...

Two identical rollers, each of weight W= 1000N are placed by an inclined plane and a vertical wall as shown below. Determine the reactions at the points of supports A, B, and C. Su

Computer added design, Computer added design Using SolidWorks create an...

Computer added design Using SolidWorks create an assembly model of the roller, bracket and base shown to the right. The assembly is also shown in exploded view below. You may c

Disc type brake, Disc Type Brake:  As shown in Figure the disc brake ...

Disc Type Brake:  As shown in Figure the disc brake consists of a pearlitic grey cast iron disc bolted to the wheel hub and a stationary housing called caliper. Casting in tw

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd