NDT and DT

1. Presentation on-NDT and DT
Date-28-07-2018
By-
Suneel kumar

2. Nondestructive testing
non-destructive testing (NDT) is a wide group of analysis
techniques used in science and technology industry to
evaluate the properties of a material, component or
system without causing damage.The
terms nondestructive examination (NDE), nondestructive
inspection (NDI), and nondestructive evaluation (NDE)
are also commonly used to describe this technology

3. •Benefits of Nondestructive Testing
•1. Safety
•Nondestructive testing is conducted to determine
whether a component is compromised or in need of
repair. The tests are designed to maximize both tester
and tested product safety. In other words, most tests
are completely harmless to humans (radiographic
testing must be conducted under strict settings), and
all tests leave tested products completely undamaged.

4. •2. Reliability
•When it comes to accurate results, nondestructive
testing is reliable because of the variety of available
and complementary options. Any given piece of
equipment or machinery can be subject to a number of
nondestructive tests, which eliminates the risk of
oversight or inaccuracy
•3. Affordability
•Different industries have different safety standards, and
different types of machinery have to be regularly
inspected at different intervals. But regardless of what
has to be inspected, a nondestructive test will always
be the most affordable option. Destructive testing
methods (like automobile crash tests) typically cost an
order of magnitude more.

5. Weld verification
•In manufacturing, welds are commonly used to join
two or more metal parts. Because these connections
may encounter loads and fatigue during product
lifetime, there is a chance that they may fail if not
created to proper specification. For example, the base
metal must reach a certain temperature during the
welding process, must cool at a specific rate, and
must be welded with compatible materials
•Welding techniques may also be actively monitored
with acoustic emission techniques before production
to design the best set of parameters to use to
properly join two materials.

6. Structural mechanics
NDT, the structure undergoes a dynamic input, such
as the tap of a hammer or a controlled impulse. Key
properties, such as displacement or acceleration at
different points of the structure, are measured as the
corresponding output. This output is recorded and
compared to the corresponding output given by the
transfer function and the known input. Differences
may indicate an inappropriate model (which may alert
engineers to unpredicted instabilities or performance
outside of tolerances), failed components, or an
inadequate control system

7. What is Destructive Testing?
•Destructive testing is a testing technique in which the
application is made to fail in an uncontrolled manner to
test the robustness of the application and also to find
the point of failure.
•Destructive testing is performed under the most severe
operating conditions and it is continued until the
application breaks. The main purpose of destructive
testing is not only to determine the design weaknesses
if any which may not show up under normal working
conditions but also to determine the service life of the
product.

8. Destructive testing
•In destructive testing (or destructive physical
analysis, DPA) tests are carried out to the
specimen's failure, in order to understand a
specimen's performance or material behaviour under
different loads. These tests are generally much
easier to carry out, yield more information, and are
easier to interpret than nondestructive testing.
Destructive testing is most suitable, and economic,
for objects which will be mass-produced, as the cost
of destroying a small number of specimens is
negligible.

9. Benefits of Destructive Testing (DT)
1-Verifies properties of a material
2-Determines quality of welds
3-Helps you to reduce failures, accidents and costs
4-Ensures compliance with regulations

10. Destructive vs. Non-Destructive
Take a second to imagine that you want to make a
cake. You have the exact amount of milk that the
recipe calls for, but you aren't sure if the milk is
good. If you taste the milk, you'll no longer have
enough milk for the recipe even if it is still good.
However, you could just smell the milk to determine
if it is good or bad, and then you will know if it is
good and still have enough milk for the cake.
In this example, you have two different options, a
destructive test and a non-destructive test.
The destructive test, or tasting the milk, would
destroy your product so that it cannot be used for
anything else. A non-destructive test, or smelling the
milk, does not destroy your product so it can still be

11. THANK YOU