Determine modulus of resilience, Mechanical Engineering

Determine modulus of resilience:

A steel specimen of 10 mm diameter & 50 mm gauge length was tested in tension and following observations were recorded.

Load at upper yield point = 20600 N

 Load at lower yield point = 19650 N

Maximum load = 35550 N

Gauge length after fracture = 62.43 N

Determine modulus of resilience and modulus of toughness. Also compute % elongation. E = 210 × 103  N/mm2 .

Solution

Area of cross-section of specimen,

A0  = (π/4 ) d 2

A 0 = (π /4 )(10) 2  = 78.57 mm2

∴          Yield strength,

σ Y = 19650 /78.57 = 250 N/mm2

Ultimate tensile strength, σ u  = 35550 /78.57 = 452.5 N/mm2

            Strain at fracture or % elongation =ε f = 62.43 - 50 = 0.25 or 25%

∴          Modulus of resilience  =

2383_Determine modulus of resilience.png

=          (250)2  /2 × 210 × 103 N-mm/mm3

= 148.8 × 10- 3  N-mm/mm3

 

(i)                  (Compare with Example 1 to note that for higher yield strength modulus of resilience is larger).

Modulus of toughness =       (su  +sY /2)   ε f

                                      = (452.5 + 250 /2 )× 0.25 N-mm/mm3

                                     = 87.8 N-mm/mm3

% elongation = 25%

Posted Date: 1/23/2013 2:39:42 AM | Location : United States







Related Discussions:- Determine modulus of resilience, Assignment Help, Ask Question on Determine modulus of resilience, Get Answer, Expert's Help, Determine modulus of resilience Discussions

Write discussion on Determine modulus of resilience
Your posts are moderated
Related Questions
pin shift return spring : Check pin shift return spring for proper torque.

temparature stresses in composite bars

Advantages and Limitations of Adhesive Bonding The description so far might be concluded through listing main advantages of adhesive joints. (a) The adhesive joints assist

How kleins construction method is different from other type of graphical method

Just-In-Time: This unit begin with the discussion of Just-In-Time strategy. Several terms used in the process are also explained. JIT is an encompassing philosophy considering

Draw complete shear and moment diagrams for a 3 m long cantilever beam having a uniform distributed load of 2 kN/m along its length.

Describe the key terms i. Write two differences between boiler and turbine. ii. Compare the rankine cycle with carnot cycle in terms of efficiency and work ratio iii.

Plate clutch pressure:  Check plate clutch pressure for any step using a straight edge.

Homogeneous and isotropic material: A homogeneous material implies that elastic properties like modulus of elasticity and Poisson's ratio of material are same everywhere in

What are the limitations with rectangular combined footings? In this section the analysis is limited to the determination of plan dimensions of the footing. The physical dimens