Nondestructive Testing (NDT) is a very broad, interdisciplinary field that plays a critical role in assuring that structural components and systems perform their function in a reliable and cost effective fashion. NDT technicians and engineers define and implement tests that locate and characterize material conditions and flaws that might otherwise cause planes to crash, reactors to fail, trains to derail, pipelines to burst, and a variety of less visible, but equally troubling events. These tests are performed in a manner that does not affect the future usefulness of the object or material. In other words, NDT allows parts and material to be inspected and measured without damaging them. Because it allows inspection without interfering with a product's final use, NDT provides an excellent balance between quality control and cost-effectiveness.

Before taking any ultrasonic equipment into the field, it is important to predict the performance of the system on the specific component to be tested.In the past, this was usually done by carrying out tests on mock-ups of the component in the laboratory. However,numerical modelling of the interaction of ultrasound with the component has found an increasing role.Finite element analysis has the advantage that it is the most accurate method against which other methods can be calibrated.Finite element Modelling reduces the time required for on-site testing and increases the reliability of the tests.

Except mechanisms,the civil structure's safety, because of its great importance for a wide range of constructed facilities such as buildings, bridges, nuclear structures, earth structures, offshore facilities, dams, lifelines. Various tests which are performed on concrete slab for measuring concrete slab thickness, reinforcing bars distribution, size and depth, concrete cover thickness, concrete hardness and strength are sorely needed. As well as simulations and NDT/NDT are used to draw the critical conclusions.

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