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What is meant by ultimate stress?

what is meant by poision ratio?

what is meant by friction?

what is meant by co-efficient of friction?

R u know?

What is meant by yield stress & yield strength?

The material can withstand force upto a certain point and the break . that point is yield stress.

The yield strength is defined as the stress at which a predetermined amount of permanent deformation occurs.

Use of  Pressure cooker? 

         The Pressure Cooker is fully close modal so increase pressure in cooker by corresponding temperature. The higher temperature causes the food to cook faster; cooking times can typically be reduced to 1/3 of the time for conventional cooking methods.

how much pressure is maintain in cooker?

          Most pressure cookers have a working pressure setting of 15 psi, which equates to 103 kPa, 1.03 bar. Some pressure cookers have a lower maximum pressure than the industry standard 15 psi, or can be adjusted to different maximum pressures; cooking times will increase or decrease accordingly.

Material Properties

Ductility is a solid material's ability to deform under tensile stress. Ductile metals include mild steel, copper etc .  Its make cup and cone shape during tensile stress.

(a) Brittle fracture         (b) Ductile fracture                (c) Completely ductile fracture

Malleability is a similar property, is a material's ability to deform under compressive stress.

Brittle materials absorb relatively little energy before fracture. Cast iron is a typical brittle metal.

Strain in Material

Strain:

         It is ratio of change in length and original length.

Consider a rod with initial length L which is stretched to a length L'. The strain measure e, a dimensionless ratio, is defined as the ratio of elongation with respect to the original length

Stress in Material

What is ment by stress?

           It is force applied to material to get deformation called stress.

Tensile Stress:

          It is force applied apart material.

Compressive stress:

         It is force applied towards material. It is reverse of tensile stress.

 

Fatigue stress:

         It is applied in cyclic application. Due to vibration or thermal.

 
Shear stress:

         It is force applied to perpendicular axis to get twist.

a)Compressive Stress         b)Tensile Stress            c)Shear Strees