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Mechanical - Strength of Materials - Stress, Strain and Deformation of Solids

**STRESS,
STRAIN AND DEFORMATION OF SOLIDS**

**1. Define
Poisson’s Ratio.**

The negative ratio of lateral strain to the
longitudinal strain is known as Poisson’s ratio.

**2. What is thermal Stress?**

If
the expansion of a structural member is constrained, it will cause stresses to
develop which are known as thermal Stress.

**3. State
Hooke’sLaw.**

The Ratio of stress to the strain with in elastic
limit is known as Hooke’s Law.

**4. Define Bulk Modulus.**

The
Ratio of direct stress to the corresponding volumetric strain is known as Bulk
Modulus.

**5. Define Modulus of resilience.**

Proof resilience per unit volume is defined as
Modulus of resilience.

**6.
Define Elasticity.**

It is the property of material to regain its
original shape and dimensions on removing external load acting on it.

**7.
Give the relation between Modulus of Elasticity and Modulus of Rigidity.**

The relation between modulus of elasticity and
modulus of rigidity are as follows E= 2G(1+v)

**8. What is Strain Energy?**

The Workdone is stored in rod and is known as strain
energy.

**9. Define Proof Resilience.**

The
maximum strain energy that can be stored in a body without permanent
deformation is known as Proof resilience.

**10.
Define compressive stress.**

The Resistance offered by the section of member or
body against the decrease in length due to applied pushing load.

**11.
Define: Bulk-modulus**

The ratio of direct stress to volumetric strain is
called as bulk modulus.. Bulk modulus, K = Direct stress / Volumetric strain

**12.
Define: Shear modulus or Modulus of rigidity**

The ratio of shear stress to shear strain is called
as bulk modulus.. Shear modulus, G = shear stress / shear strain

**13.
State the relationship between Young’sModulus and Modulus of Rigidity.**

E = 2G (1+μ)

Where,

E - Young’s dulusMo G –Modulus of rigidity

μ- Poisson’s
ratio

**14.
Give the relationship between Bulk Modulus and Young’sModulus.**

E = 3K (1-2μ)

V Where,E
- Young’s dulusMo

K - Bulk Modulus

μ- Poisson’s
ratio

**15.
What is principle of super position?**

The resultant deformation of the body is equal to
the algebric sum of the deformation of the individual section. Such principle
is called as principle of super position

**16.
What is compound bar?**

A composite bar composed of two or more different
materials joined together such that the system is elongated or compressed in a
single unit.

**17.
What you mean by thermal stresses?**

If the body is allowed to expand or contract freely,
with the rise or fall of temperature no stress is developed, but if free
expansion is prevented the stress developed is called temperature stress or
strain.

**18.
Define principle stresses and principle plane.**

Principle stress: The magnitude of normal stress,
acting on a principal plane is known as principal stresses.

Principle plane: The planes which have no shear
stress are known as principal planes.

**19.
What is the radius of Mohr’scicle?**

Radius of Mohr’scircle is equal to the maximum shear
stress.

**20.
What is the use of Mohr’scicle?**

To find out the normal, resultant and principle
stresses and their planes.

**21.
List the methods to find the stresses in oblique plane?**

1. Analytical
method

2. Graphical
method

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