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the leading or lagging between the stress and strain is called hysteresis loop

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Q: What is hysteresis loop in stress and strain?
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Continue Learning about Mechanical Engineering

Can stress exists without strain and vice versa. eg a heated bar held rigidly at both ends has no strain but there is stress?

Wherever there is stress there is strain. In the example you noted, if heated bar expands freely without one end constained it changes its strain without stress; that strain is called eigenstrain. If the same bar is held rigidly then the eigenstrain resisted and you get stress and strain. So stress cannot exist without strain; but strain can exist without stress if it is eigenstrain.


What is strain and stress?

stress is load per unit area; when an object is loaded it is under stress and strain and it stretches (strains) until it breaks at its ultimate strength. Stress i srelated to strain in the elastic region by Hooke's law: stress = elastic modulus times strain where modulus is a property of the material and strain is deflection over length


Strain-stress diagram of copper and steel?

difference between Strain-stress diagram of copper and steel?


Is defined as ratio of uniform stress to volume strain?

is defined as ratio of uniform stress to volume strain


What is the difference between the modulus of rigidity and modulus of elasticity?

We knew from Hook's law- "stress is proportional to strain." So, stress = k * strain [here, k is a constant] or, stress/strain= k Now, if the stress and strain occurs due to axial force then k is known as modulus of elasticity and it is denoted by E. if the stress and strain occurs due to shear force then k is known as modulus of rigidity and it is denoted by G.