Lecture 6 - Stress and Strain
Type Lecture
Date @October 12, 2023
Materials https://www.youtube.com/watch?v=lxlIPlE9bYc
Reviewed
Principals of Stress and Strain
Types of Forces
Stress and Strain - What are they?
Stress
Strain
Modulus of Elasticity
Stress Strain Curves
Definitions
Stress Strain Curves - Concrete and Steel
Shear Stress
Bending Stress
Types of Forces
Axial (Tension/Compression)
Shear
Bending
Torsion
Lecture 6 - Stress and Strain 1
, Axial Shear Bending Torsion
Moment
A force tending to A force acting in The twisting of an
elongate or shorten a direction A force that acts object due to an
a member parallel to a to bend a applied force
surface or to a component
planar cross putting one side
section of a body of the part in
tension and the
opposite side in
compression
kN, N, kPa and MPa
225 lb = 1 kN
1 kN = 1000 N
1 kPa = 1 kN/m^2
1 MPa = 1N/mm^2
1 MPa = 1000 kPa
Strength
Factored Load < Reduced Capacity
α Load < Φ Capacity
Xf (Pf, Vf, Mf, Tf, Cf) < Xr (Pr, Vr, Mr, Tr, Cr)
Subscript f means it has Subscript r means it has
been factored been reduced
Lecture 6 - Stress and Strain 2
, Stress and Strain - An Introduction
Stress and strain are to are to a material what force and deflection are to an object.
They are the effects on the material of an object subjected to applied loads.
Stress → Force
Strain → Deflection
Best to learn with Axial forces
Stress vs Force Stress vs Deformation
Stress
Stress is defined as force per unit area
σ = P /A
σ = Stress (N/mm^2 or MPa)
P = Force (N)
A = Cross Sectional Area (mm^2)
Stress - Illustrated
Lecture 6 - Stress and Strain 3
Type Lecture
Date @October 12, 2023
Materials https://www.youtube.com/watch?v=lxlIPlE9bYc
Reviewed
Principals of Stress and Strain
Types of Forces
Stress and Strain - What are they?
Stress
Strain
Modulus of Elasticity
Stress Strain Curves
Definitions
Stress Strain Curves - Concrete and Steel
Shear Stress
Bending Stress
Types of Forces
Axial (Tension/Compression)
Shear
Bending
Torsion
Lecture 6 - Stress and Strain 1
, Axial Shear Bending Torsion
Moment
A force tending to A force acting in The twisting of an
elongate or shorten a direction A force that acts object due to an
a member parallel to a to bend a applied force
surface or to a component
planar cross putting one side
section of a body of the part in
tension and the
opposite side in
compression
kN, N, kPa and MPa
225 lb = 1 kN
1 kN = 1000 N
1 kPa = 1 kN/m^2
1 MPa = 1N/mm^2
1 MPa = 1000 kPa
Strength
Factored Load < Reduced Capacity
α Load < Φ Capacity
Xf (Pf, Vf, Mf, Tf, Cf) < Xr (Pr, Vr, Mr, Tr, Cr)
Subscript f means it has Subscript r means it has
been factored been reduced
Lecture 6 - Stress and Strain 2
, Stress and Strain - An Introduction
Stress and strain are to are to a material what force and deflection are to an object.
They are the effects on the material of an object subjected to applied loads.
Stress → Force
Strain → Deflection
Best to learn with Axial forces
Stress vs Force Stress vs Deformation
Stress
Stress is defined as force per unit area
σ = P /A
σ = Stress (N/mm^2 or MPa)
P = Force (N)
A = Cross Sectional Area (mm^2)
Stress - Illustrated
Lecture 6 - Stress and Strain 3
