Evaluate young modulus of elasticity - ultimate stress, Mechanical Engineering

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

 

Posted Date: 10/20/2012 8:35:54 AM | Location : United States







Related Discussions:- Evaluate young modulus of elasticity - ultimate stress, Assignment Help, Ask Question on Evaluate young modulus of elasticity - ultimate stress, Get Answer, Expert's Help, Evaluate young modulus of elasticity - ultimate stress Discussions

Write discussion on Evaluate young modulus of elasticity - ultimate stress
Your posts are moderated
Related Questions
High Carbon Tool Steels Tools are implements such are employed to shape, cut or deform other materials. They are largely made in steel, although other alloys have also been i

How CAD system communicate with control system The concept of a universal data exchange system is depicted in figure. In this figure, it is shown how various CAD systems commun

Derive a regression forecasting equation: The general manager of a company producing road rollers is convinced that the demand for road rollers is associated to the number of

Q.   State and briefly explain the various phenomena useful for electromechanical energy conversion in rotating machines.   Sol. In the rotating machines there are mainly tw

Occupational Safety - Industrial Safety The bad and most debilitating experience related to work which a worker can have is a work-related accident or illness. Within the effe

Stellite This is an alloy of Co as 40-60%, Cr as 25-35%, W as 4-25% and C as 1-3%. This is a cast alloy comprising C, W, and Cr in Cobalt matrix. Its major characteristic is l

Writing of a Welding Procedure specification (WPS ) A typical working procedure specification is written with all the factors of production in mind. Both experience and latest t

wire-frame entities-representing ellipse and parabolas

Q. Show Bolt Material? Bolt material must be selected with adequate yield strength at the operating temperature to provide the required strength to properly seat the gasket. It

Types of Registration Provisional Registration Certificate ( PRC ) This is given for the pre-operative period and enables the units to obtain the term loans and worki