Stress And strain
What is the difference between pressure and stress?
Answer:
Pressure is the external force acting over a unit surface area of a material. Stress is an internal force acting over a cross sectional area within the material. It may also be thought of as the internal resistive response of a material to the applied external pressure. They both have the units of force / area. suppose we have a cubical solid mass. We apply external force of few magnitude on it and this force will try to deform the cube. At the same instant an internal force will generate within the cube that will try to maintain the shape and size of the cube i.e. this internal force will work against the applied external force. this induced force within the cube is stress.
Some Conceptual Def;
1)Pressure; Intensity of external forces acting on a body per unit area .For example Atmospheric Pressure It’s the pressure exerted by air on surface of earth.
!)Stress is Internal Resistance offered by a body to external forces per unit area. Taking an example of Rubber Material. You apply some force and it deforms. But assume it doesn't deforms then what happens, material is applying force equivalent to external force. That opposite force in termed as Internal Resistance and its ratio with area is called Stress.
Detailed Def;
Stress;
Stress is a measure of the internal force an object is experiencing per unit cross sectional area. Hence, the formula for calculating stress is the same as the formula for calculating pressure:
where σ is stress (in Newtons per square metre or, equivalently, Pascals). F is force (in Newtons, commonly abbreviated N), and A is the cross sectional area of the sample.
Tensile Strength;
The (ultimate) tensile strength is the level of stress at which a material will fracture. Tensile strength is also known as fracture stress. If a material fractures by 'crack propagation' (i.e., it shatters), the material is brittle.
Yield Stress;
On a stress strain graph
Answer:
Pressure is the external force acting over a unit surface area of a material. Stress is an internal force acting over a cross sectional area within the material. It may also be thought of as the internal resistive response of a material to the applied external pressure. They both have the units of force / area. suppose we have a cubical solid mass. We apply external force of few magnitude on it and this force will try to deform the cube. At the same instant an internal force will generate within the cube that will try to maintain the shape and size of the cube i.e. this internal force will work against the applied external force. this induced force within the cube is stress.
Some Conceptual Def;
1)Pressure; Intensity of external forces acting on a body per unit area .For example Atmospheric Pressure It’s the pressure exerted by air on surface of earth.
!)Stress is Internal Resistance offered by a body to external forces per unit area. Taking an example of Rubber Material. You apply some force and it deforms. But assume it doesn't deforms then what happens, material is applying force equivalent to external force. That opposite force in termed as Internal Resistance and its ratio with area is called Stress.
Detailed Def;
Stress;
Stress is a measure of the internal force an object is experiencing per unit cross sectional area. Hence, the formula for calculating stress is the same as the formula for calculating pressure:
where σ is stress (in Newtons per square metre or, equivalently, Pascals). F is force (in Newtons, commonly abbreviated N), and A is the cross sectional area of the sample.
Tensile Strength;
The (ultimate) tensile strength is the level of stress at which a material will fracture. Tensile strength is also known as fracture stress. If a material fractures by 'crack propagation' (i.e., it shatters), the material is brittle.
Yield Stress;
On a stress strain graph