L1 ndt versus mechanical testing &; overview of liquid penetrant test
1. OML751 TESTING OF MATERIALS
ME8097 NON DESTRUCTIVE TESTING
AND EVALUATION
M.KARTHIKEYAN
ASSISTANT PROFESSOR
DEPARTMENT OF MECHANICAL ENGINEERING
AAA COLLEGE OF ENGINEERING & TECHNOLOGY, SIVAKASI
karthikeyan@aaacet.ac.in
2. UNIT I OVERVIEW OF NDT
1. NDT Versus Mechanical testing & Overview of Liquid penetrant
test
2. Overview of Magnetic particle test
3. Overview of Thermography test
4. Overview of Eddy current test
5. Overview of Ultrasonic test
6. Overview of Acoustic emission test
7. Overview of Radiographic test
8. Various physical characteristics of materials and their
applications in NDT.,
9. Visual inspection – Unaided and aided.
4. DESTRUCTIVE TEST NON DESTRUCTIVE TEST
1 Used for finding out the
properties of the material
Used for finding out defects of
materials
2 Load is applied on the material Load is not applied on the
material
3 Due to load application, material
gets damaged
No load applications, so no
chance for material damage
4 Tested material cannot be
reused.
Tested material can be reused.
5 Tests are mostly quantitative
measurements.
Tests are mostly qualitative
and rarely quantitative
measurements.
6 All measurements are direct Most of the measurements are
5. DESTRUCTIVE TEST NON DESTRUCTIVE TEST
7 In – service inspection is not
possible
In – service inspection is
possible
8 Specimen preparation is
necessary.
Little or no specimen
preparation is required.
9 Can measure only one
property at a time.
Can measure many
parameters.
10 Time conception for inspection
is more.
Rapid inspection is possible
11 Skilled man power is not
required to interpret the
results
Skilled man power is required
to interpret the results
7. LIQUID PENETRANT TESTING
INTRODUCTION:
Used to detect the surface discontinuities in non porous
solids.
Can be used for both ferrous and non-ferrous materials.
Used to detect casting, forging and welding surface defects
such as hairline cracks, surface porosity, leaks in new
products and fatigue cracks.
12. ADVANTAGES
High sensitivity
Small discontinuities can be detected
Metallic, non-metallic, magnetic, non-magnetic, conductive
and non-conductive materials may be inspected.
Rapid Inspection of large areas
Suitable for complex shapes
Indications are produced directly on the surface
Indications can reveal relative size, shape, and depth of the
flaw
Portable
Low cost
It is easy and requires minimal amount of training
13. DISADVANTAGES
Only surface and near surface defects can be detected
Only non-porous surface can be inspected
Pre-cleaning is critical
Post cleaning is required
Chemical handling and proper disposal is required.
Surface finish and roughness can affect inspection sensitivity.
Fumes can be hazardous and flammable without proper
ventilation
14. PART - A
1. Distinguish between destructive testing and non destructive
testing(UN, CO1)
PART - B
1. Explain the sequence of operations of liquid penetrant testing
2. Compare the destructive testing methods and non-destructive
testing methods with respect to its advantages and limitations
QUESTIONS