Q: What is Strain energy??
Ans.: Strain energy is the energy stored in a body when
strained within elastic limits.
Q: What is the difference between Stress and Pressure?
Ans.:
Pressure=Force/Area. And Stress=Resistive force/Area.
Pressure represent intensity of external forces acting at a
point. But stress represent intensity of internal resisting forces develop at a
point.
Q: What is Truss?
Ans.: Truss is a rigid structure composed of number of
straight members pin jointed to each other.
It can sustain dynamic and static load without any relative
motion to each other.
Q: Types of truss:
Ans.:
Plain truss
Rigid truss
Simple truss.
Q. A vertical column has two
moments of inertia (i.e. Ixx and Iyy ). The column will tend to buckle in the
direction of the___________
Ans.: minimum moment of inertia.
Q: What is neutral axis?
Ans.: The neutral axis of the
cross-section a beam is that axis at which the bending stress is zero.
Q: What is Poisson’s ratio?
Ans.: Poisson’s ratio is the ratio
of lateral strain to longitudinal strain.
Its value is always less than one.
Poisson ratio is often represented by 1/m or μ
Q: Can Poisson Ratio be Negative
or zero?
Ans.: Poisson's ratio for a cork
is almost zero. Yes Poisson's ratio can be negative. Such materials are called
as "auxetics". E.g. Human ligaments
Q. Poisson’s Ratio is higher in,
Rubber/Steel/Wood?
Ans.:
For rubber = 0.5
For steel = 0.288
For wood < 0.2
Thus Poisson’s ratio is higher in
RUBBER.
Q: What is Poisson effect?
Ans.: When a material is
compressed in one direction, it usually tends to expand in the other two
directions perpendicular to the direction of compression. This phenomenon is
called the Poisson effect. Poisson’s ratio is a measure of the Poisson effect.
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