WOW
Solid mechanics
In this section we will talk about the stress and strain diagram.
start
STRESS STRAIN DIAGRAM
Plastic and elastic materials
Tensile test
...continuing with the topic, in this section we will see in a didactic way about the elasticity and plasticity in a material.
Hello! pay close attention to the way the specimen is deforming. On one side we can see the graph where we can see how it is deforming as it is subjected to the axial tensile stress.
Structural failure in steel (ductility)
As civil engineers we must guarantee the durability and resistance of a material, for this reason there are tests such as the one mentioned in this section. The main objective is that the materials do not exceed the elastic zone, because we are interested that the material does not suffer permanent deformations and that they can reach their initial characteristics again.
This is a stage that occurs once creep has been exceeded and the neck has been formed, and occurs due to changes in the crystalline structure of the material.
What is yield stress?
It is the stress at which a material exhibits a specified permanent deformation and is a practical approximation of elastic limit.
- Mainly yield resistant steels refer to the elastic limit of the steel, which is the amount of stress that a piece of this material must withstand to achieve plastic deformation.
Last effort
is the point in the deformation of the steel at which it fails completely; after passing that border, the steel element breaks.
Maximum stress that an element can withstand before (according to a safety factor) it reaches a critical situation.
Permanent plastic deformation with a constant stress, until a point is reached where further deformation of the material will require an increase in the intensity of the stress that deforms it.
What is the proportional limit?
The proportional limit corresponds to the location of the stress at the end of the linear region, so the stress-strain graph is a straight line and the gradient will be equal to the elastic modulus of the material.
Elastic Zone
It is the part where when the load is removed the material returns to its initial shape and size.
In addition, its behavior obeys Hooke's law.This law establishes that "The force that returns a resource to its equilibrium position is proportional to the value of the distance that it moves from that position."
σ=Eε
Plastic Zone
The curved section of the graph represents the plastic region, reflecting the permanent deformation of the material. In this area, the proportionality between stress and deformation is lost, generating a permanent deformation until the rupture of the material occurs.
stress-strain diagram
Daniela Peñaranda
Created on August 31, 2023
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Transcript
WOW
Solid mechanics
In this section we will talk about the stress and strain diagram.
start
STRESS STRAIN DIAGRAM
Plastic and elastic materials
Tensile test
...continuing with the topic, in this section we will see in a didactic way about the elasticity and plasticity in a material.
Hello! pay close attention to the way the specimen is deforming. On one side we can see the graph where we can see how it is deforming as it is subjected to the axial tensile stress.
Structural failure in steel (ductility)
As civil engineers we must guarantee the durability and resistance of a material, for this reason there are tests such as the one mentioned in this section. The main objective is that the materials do not exceed the elastic zone, because we are interested that the material does not suffer permanent deformations and that they can reach their initial characteristics again.
This is a stage that occurs once creep has been exceeded and the neck has been formed, and occurs due to changes in the crystalline structure of the material.
What is yield stress?
It is the stress at which a material exhibits a specified permanent deformation and is a practical approximation of elastic limit.
Last effort
is the point in the deformation of the steel at which it fails completely; after passing that border, the steel element breaks.
Maximum stress that an element can withstand before (according to a safety factor) it reaches a critical situation.
Permanent plastic deformation with a constant stress, until a point is reached where further deformation of the material will require an increase in the intensity of the stress that deforms it.
What is the proportional limit?
The proportional limit corresponds to the location of the stress at the end of the linear region, so the stress-strain graph is a straight line and the gradient will be equal to the elastic modulus of the material.
Elastic Zone
It is the part where when the load is removed the material returns to its initial shape and size.
In addition, its behavior obeys Hooke's law.This law establishes that "The force that returns a resource to its equilibrium position is proportional to the value of the distance that it moves from that position."
σ=Eε
Plastic Zone
The curved section of the graph represents the plastic region, reflecting the permanent deformation of the material. In this area, the proportionality between stress and deformation is lost, generating a permanent deformation until the rupture of the material occurs.