effects of a fracture on ultrasonic wave velocity and ... · presenter: muhammad irfan . outline...
TRANSCRIPT
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Effects of a fracture on ultrasonic wave velocity and
attenuation of a homogeneous medium
Authors:
Sabah Hassan Dr. Dipanjan Basu
Diana Gomez Rodriguez Dr. Maurice Dusseault
Dr. Giovanni Cascante ([email protected])
Presenter: Muhammad Irfan
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Outline
Introduction
Problem statement and objective
Background
Methodology and materials
Results
Conclusions
2 NDT in Canada 2017 Conference (June 6-8, 2017)
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Ultrasonic pulse velocity (UPV)
method (ASTM reference) is used for
damage detection
Velocity is not sensitive
Wave attenuation is sensitive
3
Introduction
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Problem statement
Damage detection is performed using wave velocity alone.
Objective
Detection of damage using wave velocity and attenuation
in UPV testing.
4
Problem statement and objective
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Assessment of fracture propagation in a homogenous
material (PMMA) using UPV method.
Correlation of fracture length with changes in wave
parameters (velocity and attenuation).
5
Tasks to achieve the objectives
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UPV method
6
Background
5.5 104
6 104
6.5 104
7 104
7.5 104
0.28
0.065
0.41
0.755
1.1
Normalized Amplitude of input and output signals (case1 test3)
Time [sec]
Norm
alized A
mplitu
de
0 3.75 104
7.5 104
1.125 103
1.5 103
1.25
0.625
0
0.625
1.25
Normalized Amplitude of input and output signals (case1 test3)
Time [sec]
Norm
alized A
mplitu
de
t
5 104
6 104
7 104
0
1 103
2 103
Vectorizing of the frequency spectra of output signal tests(case1,intact)
Frequency
Mag
nitu
de
V_OutputS12
fr
Area
Attenuation (A) L
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p
LV
t
Wave velocity (Vp)
( )( , ) ( ) x
oA x A e
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7
Methodology
PMMA Specimens (19)
PMMA Annealed (15)
- Thickness = 25.4 mm (8)
- Thickness = 12.7 mm (7)
PMMA Solid (2) & Annealed (2)
Thickness = 25.4 mm
Case II (4)
Uniaxial compression test
Comparison of velocity and attenuation
Case I (15)
Intact, hole and fractured
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PMMA specimens
8
Materials – testing scheme
Heating and pressurizing time: 6 hours
Fabrication conditions of PMMA
Specimen # Type Thick. (mm) Temperature
(Co)
Pressure
(KPa)
PA-(1-4) Annealed 25.4 150 24
PA-(5-8) Annealed 25.4 150 12
PA-(9-10) Annealed 25.4 150 6
PA-(11-13) Annealed 12.7 150 12
PA-(14-16) Annealed 12.7 177 6
PA-17 Annealed 12.7 177 12
PS-(1-2) Solid 25.4 - -
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9
Signal windowing
a – original signal b – window factor (0.1) c – window factor (0.3)
b c
a
b
c
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10
Change in Vp
Results – Case - I
∆Vp = 2.6%
Intact ± hole
Fractured + hole
(a)
∆Vp = 3.4% Intact ± hole
Fractured +hole
(b)
d = 12.7 mm d = 25.4 mm
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11
Intact
+Hole
+Fract.
Vp% % A
100% 100%
100% 87%
97.4% 38%
Case – I – Comparison of Vp and A
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Thickness = 12.7 mm
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12
Thickness = 25.4 mm
Intact
+Hole
+Fract.
Vp% %A
100% 100%
100% 87%
96.6% 55%
Case – I - Comparison of Vp and A
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13
Case - I – Frequency spectra
w/ hole - 15%
w/ hole+frac. - 52%
w/ hole + frac. - 56%
Intact +Hole +Fracture
Thickness = 12.7 mm Thickness = 25.4 mm
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% difference in spectrum area
25 kHz 25 kHz
w/ hole - 15%
w/ hole+frac. - 53%
w/ hole + frac. - 57%
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14
Stress-strain from compression test
Case – II – Elastic moduli
A B
EA
EB
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EA - initial
EB – final
Ed – dynamic using wave paramters
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15
Case – II - Fracture growth
Annealed
Solid
PA1
PA2
PS1
PS2
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Velocity
Fracture
16
Case – II - Vp and fracture vs load
Annealed PMMA Solid PMMA
Velocity Fracture
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17
Case – II - Comparison of Vp and A
Typical annealed PMMA
P = 0 , fracture = 0
P = 50 kN, fracture = 10 mm
P = 140 kN , fracture = 70 mm
Vp% % A
100% 100%
100% 64%
96.4% 32%
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f1=54 kHz
f2=30 kHz
f3=16 kHz
18
Case – II - Frequency spectra
Typical annealed PMMA
Fracture % % Area
0% 100%
14% 76%
100% 27%
P=0 P= 50 kN P = 140 kN NDT in Canada 2017 Conference (June 6-8, 2017)
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19
Case – II – Effect of frequency bandwidth
Typical annealed PMMA
Fracture ATot
Alarge
Asmall
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20
Conclusions
Wave velocity shows extremely low sensitivity to fracture length (≈ 3 %).
Wave attenuation is much more sensitive
Effect of fracture length on wave amplitudes: Case – I ≈ 45 %, Case – II ≈ 70 %
Effect of fracture length on spectrum area: Case – I ≈ 53 %, Case – II ≈ 70 %
Areas calculated using smaller frequency ranges are more sensitive than larger
frequency ranges
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21
Ministry of Higher Education and Scientific Research in Iraq.
Natural Sciences and Engineering Research Council of Canada (NSERC)
University of Waterloo.
Acknowledgement
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Thank you for your listening