This article explains stress strain curve for mild steel. Learn about stress strain behavior of mild steel, including its yield point and ultimate strength. Explore factors affecting its mechanical properties.
Table of Contents
Description Of Stress Strain Curve For Mild Steel
Before starting the description of the stress strain curve for mild steel, we have to know some basic terms used in the stress strain curve for mild steel.
Stress:
Stress is the internal force per unit area which resists the deformation when an external load is applied.
σ= F/A
Strain:
Strain is deformation in the body which we can define as the ratio of change in length to the original length.
ε = ∆L/L
Hooks Law:
According to hooks law F=-kL
Where K is constant, F is applied force and L is distance. Extension will be proportional to the applied load.
Elasticity:
Elasticity is the property of material by virtue it can regain its original shape after removal of load.
Plasticity:
When we applied load on the body and it deformed permanently called plasticity.
Proportional Limit:
When we applied load on mild steel first point we observe Point A which is called proportionality limit because stress and strain are proportional to the applied load and it follows hook’s law and this line will be straight.
Elastic Limit:
Limiting value of stress up to which a material behaves like a perfectly elastic called elastic limit. In the figure, point B is the elastic limit point. After removal of the load material can regain its original shape if does not cross point B.
Yield Strength:
Yield strength is a phase in the curve in which extension takes place more even application of small load or negligible load. CD curve shows yield strength of mild steel.
Ultimate Strength:
Ultimate strength is the maximums strength of a material that can bear without fracture. Stress on this point is called ultimate stress. Point E is the point of ultimate strength. After point E material can break suddenly even application of small load.
Fracture Point:
Point F is the fracture point in the curve. The fracture point is a point where the strength of material breaks and the strength of this point is called rupture strength.
Final Thought
In this blog post, I have explained the stress-strain curve for mild steel. Mild steel is a very popular construction material so it is very important to know the behavior of mild steel.
Faqs
Maximum elastic energy absorbed in the material is called the Modulus of Rupture. In the figure, the area under point A is called the Modulus of Resilience. Modulus of Resilience = Area of triangle OPA
In the figure, area under fracture point is called Modulus of Rupture. Modulus of Rupture = Area enclosed by point P, A, B, C, D, E, F and Q.
When we applied a force on a body it experiences strain and due to strain, stress occurred in the body. So we can say that strain is an independent quantity and stress depends upon the strain. It follows the typical function that is y=f(x), where x is strain and y is stress.