For steel, the energy to produce tensile failure is 105Jm 2 (i.e. fracture energy), modulus of elasticity 200 x 10°NM2. Thus if steel is to have cracks which do not propagate when a stress of 50 x10°Nm 2 is applied then what is the maximum crack length allowable 1.3m 50mm O 50 x10-9m 5um

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Metrology of surface finish

In general terms, the application of scientific principles in the study of measurements is known as metrology. When speaking about measurement, it could be of time, length, microstructures, grain structures, internal crystal discontinuities, surface roughness, measurements of angles, height, width, and so on. While coming to the domain of mechanical engineering, metrology is considered the science of measurements of surface finish, length, surface texture, and angles.