2. WHAT IS STRESS?
Stress is the force per unit area on a body that tends to cause it to change shape. Stress is a
measure of the internal forces in a body between its particles. These internal forces are a reaction to
the external forces applied on the body that cause it to separate, compress or slide
i.e.,Stress=Force/Unit Area . Stress is generally two types.
2
Stress
Normal
Stress
Shear
Stress
3. WHAT IS GENERAL SHEAR STRESS ?
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Shear stress, often denoted by τ (Greek: tau), is the component of stress coplanar with a
material cross section. It arises from the shear force, the component of force vector parallel
to the material cross section.
Common symbols: τ
SI unit: pascal
4. 4
Shearing Stresses in Bolts
• Shearing Stress is commonly found in bolts,pins and rivets.
• Bolts is in “single” shear
• Force P results in shearing stress
5. 5
Other Forms of Shear Stresses
• Pure Shear - Pure shear is a three-dimensional homogeneous flattening of a body. It is an example
of irrotational strain in which body is elongated in one direction while being shortened
perpendicularly.
• Beam shear - Beam shear is defined as the internal shear stress of a beam caused by the shear
force applied to the beam where The beam shear formula is also known as Zhuravskii shear
stress formula after Dmitrii Ivanovich Zhuravskii who derived it in 1855.
8. SINGLE SHEAR
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• Single Shear is load applied in
one plane.
• When single cross section of
an element in a joint takes all
the shear force it is called
SHEAR SHEAR.
9. DOUBLE SHEAR
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• Double shear : simultaneous shear across two
usually parallel planes.
• Double Shear Pins are the most common pins
used. This simple calculator allows you to get
the stresses on the pin and bearings quickly with
out headaches. Unlike other online calculators,
this free calculator allows for gaps and
calculates the bending moments on the pin.
10. IDENTIFYING SHEAR STRESS OVER NORMAL
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• A shear stress denoted (Greek: tau) is defined as the component of stress co-planar with a
material cross section. Shear stress arises from the force vector component parallel to the cross
section. Normal stress, on the other hand, arises from the force vector component perpendicular
to the material cross section on which it acts.
• By finding the angle between force and sectional area, i.e. whether this is Zero, 90 or
something in between them.When ϕ = 0 there is only shear stress, for ϕ = 90 we just have
normal stress and ϕ = 45 we have both shear and normal stresses.
11. RESULT CAUSED BY SHEAR STRESS
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The resulting shear stress, τ, deforms the rectangle into a parallelogram. The area
involved would be the top of the parallelogram. Shear stress, often denoted by τ (Greek:
tau), is the component of stress coplanar with a material cross section. It arises from the
shear force, the component of force vector parallel to the material cross section.
Common symbols: τ
SI unit: pascal
