Mohr’s circle is an important tool used for visualizing relations between normal stresses, maximum principal stresses, shear stresses and maximum shear stresses. Mohr circle diagram was developed by Christian Otto Mohr and it is used widely even now. We will … Read the rest

## Difference between Ductile and brittle materials

The materials which elongates more than 5% before fracture is called ductile material otherwise brittle materials. Gold, silver, copper are typical example ductile materials and cast iron, concrete are brittle materials.

In failure theories yield strength is used for ductile … Read the rest

## Theories of failure for brittle materials (part-3): Maximum principal stress theory

Maximum principal stress theory is useful for brittle materials. Maximum principal stress theory or maximum principal stress criterion states that failure will occur when maximum principal stress developed in a body exceeds uniaxial ultimate tensile/compressive strength (or yield strength) of … Read the rest

## How to find principal stress and principal plane of a complex stress system?

The complication of a stress system increases with increase of number of applied multi directional normal and shear stress. One very interesting and important fact about the complex stress system is that most of the time there will be one … Read the rest

## Theories of failure for ductile materials (part-2): Von Mises Criterion

This theory also known as **maximum distortion energy theory, shear strain energy theory **or** octahedral shear stress theory.**** **

The detail study shows that it is the shear strain energy **rather** than shear stress which is the main culprit behind yielding … Read the rest

## Theories of failure for ductile materials (part-1): maximum shear stress criterion

There are a set of criterion on the basis of which we can predict the failure load/loads require for a certain component. It is comparatively easy to compute failure stress if the component under your design consideration is subjected to … Read the rest