Simple Stresses Flashcards
- It is a measure of the diffusion of forces inside a body
- It is the applied force or system of forces that tends to
deform a body
Stress
The stress has a magnitude and two directions;
– direction of the force
– direction of the normal to the area
The stress is a double vector
1 – direction of the force
2 – direction of the normal to the area
can be classified as normal stress, shear
stress, and bearing stress.
Simple Stress
The resisting area is perpendicular to the applied
force,
Normal Stress
There are two types of normal
stresses;
tensile stress and compressive stress
stress or force per unit area
σ
cross-sectional area
A
applied load
P
caused by forces acting along or parallel to the area resisting the forces
Shearing Stress
Tensile and compressive stresses are frequently
Tensile and compressive stresses
shearing stress may be called
shearing stress
stress or force per unit area
τ
shearing force
V
cross-sectional area
A
The rivet resists shear across its cross- sectional area;
single shear
the bolt resists shear across two cross- sectional areas;
double shear
is the contact pressure between the separate bodies. It differs from compressive stress, as it is an internal stress caused by compressive forces.
Bearing Stress
stress or force per unit area
σb
applied load
Pb
cross-sectional area ; area of contact
Ab
