Download - Torsion and Mechanical Tests
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M.Ferraris-35th ICACC
Daytona Beach , FL
Torsion tests for joined
ceramics and composites
Andrea Ventrella, Milena Salvo,Massimiliano Avalle, Monica Ferraris*
Politecnico di Torino, Italy
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M.Ferraris-35th ICACC
Daytona Beach , FL
shear tests on joined
materials..
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M.Ferraris-35th ICACC
Daytona Beach , FL
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M.Ferraris-35th ICACC
Daytona Beach , FL
CONs:
Notches are needed ifthe joint strength is
high......
(joint) < 25% (ceramic) (ASTM C 1161)
25%< (joint)
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M.Ferraris-35th ICACC
Daytona Beach , FL
Results on C/C joined by AV199 epoxy resin:
4 point symmetrical bending strength of joined C/C is44%the 3 point bending strength on C/C : V-notches
are needed to use asymm. 4 point bending test on C/C
joined by an adhesive !
Flessione a 4 Punti Simmetrica (giuntati)
0
20
40
60
80
0 10 20 30 40 50 60
s [m]
max[MPa]
4 point bending test on joined C/C -
ASTM C 1341
L = 40 mm
Lc= 20
mm
Flessione a 3 Punti (composito)
0
20
40
60
80
100
120140
160
0 5 10 15 20 25 30
Numero provino
max
[MPa]
3 point bending tests on C/C - ASTM C 1341
L = 20 mm
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M.Ferraris-35th ICACC
Daytona Beach , FL
4 point symmetrical bending strength of joined SiC is 22,3%the 4 point bending strength on SiC
.00
20.00
40.00
60.00
80.00
100.00
120.00
140.00
160.00
180.00
200.00
.00 50.00 100.00 150.00 200.00 250.00 300.00 350.00Joint thichkness
V-notches are needed to use asymm. 4 point
bending test on SiC joined with an adhesive !
bending=92,734
Results on SiC joined by AV199 epoxy resin:
MPa
415 MPa
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M.Ferraris-35th ICACC
Daytona Beach , FL
X
ZY
Comparison of shear strength tests
A4PB
Asymmetrical four-point bending test (ASTM C1469)
TC
Torsion cylinder
TT
Torsion TubeTS
Torsion square
THG
Torsion hour-glass
DN
Double notchedASTM C1292-00 & C1425-99
SLO
single lap offsetASTM D905-03 DLODouble-lap offsetSL
Single lap offsetBT
Brazilian testASTM B 898
project involvingORNL (USA), Kyoto
University (Japan)
and Politecnico di
Torino (Italy)
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M.Ferraris-35th ICACC
Daytona Beach , FL
X
ZY
Comparison of shear strength tests
A4PB
Asymmetrical four-point bending test (ASTM C1469)
TCTorsion cylinder
TTTorsion Tube
TSTorsion square
THGTorsion hour-glass
DNDouble notched ASTMC1292-00 & C1425-99
SLOSingle lap off set
DLODouble-lap offset
SLSingle lap offset
BTBrazilian test
4
3
18
10
10
10
10
o10
i810
5
25
12
5
10
3
5
10
10
6
10
5
6
15
3
15
15
44
30
ASTM B 898
the adhesive is a
model joining
material to obtaina large number of
joined samples in
reasonable time
SiC , Al2O3,
C/C joined by
an adhesive(epoxy resin -
Araldite AV
119)
A4PB
Asymmetrical four-point bending test (ASTM C1469)
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M.Ferraris-35th ICACCDaytona Beach , FL
4P- Asy:
Notches needed, not suitable for
strong joints, pure shear
different
tests give
different
results on
identicalsamples
PROs and
CONs ofeach test
for a
specific
joint must
be
evaluated
Single lap (SL):Critical alignment joint/fixturesNot suitable for strong joints
Double notched (DN) :
Critical role of notches
Single lap off set (SLO):Critical role of lateral fixtures
Double lap off set (DLO)Underestimated values
B 898:
Huge amount of material
needed
Brazilian:
Shear value not straightforward
M. Ferraris et al.,Composites: Part B 41 (2010) 182191
A. Ventrella et al.,J Mater Sci (2010) 45:44014405
E. Martin et al.,submitted to Materials Characterization(2010)
C/C test C i test
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M.Ferraris-35th ICACCDaytona Beach , FL
C/C testefficiency
%
Ceramics testefficiency
%
DN 16,29 3,30
(33,02 4,98 *)
80%
TS Not suitable 0% Not suitable 0%
TC 19.7 5.4 70% 53,79.4 80%
BT 322.6
B898 22,26.67
SL 18.3 1.9(10.452.68 *)
55% 45,8 3,5 25 %
SLO 20.42.0
(28,002,15*)
80 % 52.36 75%
DLO 12.2 0.9 85% 29.47.6 70%
test efficiency % (number of samples broken inside the joint /
total number of prepared samples, %)
( *) = misplaced notches for DN, misaligned fixtures forSL, fixture-sample friction for SLO
C/C Multiplicativefactor
Ceramics
TC 19.7 5.4 x 2.5 ~ 53,79.4
SL 18.3 1.9 x 2.5 ~ 45,8 3,5
SL
O
20.42.0 x 2.6 ~ 52.36
DL
O
12.2 0.9 x 2.4 ~ 29.47.6
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M.Ferraris-35th ICACCDaytona Beach , FL
ASTM F734-
95(2006) andF1362-97(2003)
Torsion
Test
Test rig for the torsion test
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M. Ferraris
M.Ferraris-35th ICACCDaytona Beach , FL
torsion tests for joined CMC
and ceramics:
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Torsion Tests on epoxy
joined SiC tubes
t= ??? MPa
i
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M.Ferraris-35th ICACCDaytona Beach , FL
Politecnico di Torino =67 MPa
THG SiCTHG SiC
THG SiC (Kyoto University) =66 MPa
THG SiC
THG SiC =66,42 MPa
Torsion Tests on epoxy
joined SiC hour glasses
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M.Ferraris-35th ICACCDaytona Beach , FL
Torsion Test: summary
m
THG t=66,42 MPa
TC t=63,8 MPa
TT t =27,3 MPa
t =65,11 MPa
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M.Ferraris-35th ICACCDaytona Beach , FL
TC Linear fitting byy = 8,6506x - 36,412
THG Linear fitting byy = 5,8528x - 24,853
-4
-3
-2
-1
0
1
2
3.75 3.85 3.95 4.05 4.15 4.25 4.35 4.45 4.55
LnLn(1/(1-Fj)
Ln(max)
TC
THG
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M.Ferraris-35th ICACCDaytona Beach , FL
X
ZY
Concluding remarks:
A4PB
Asymmetrical four-point bending test (ASTM C1469)
TCTorsion cylinder
TTTorsion Tube
TSTorsion square
THGTorsion hour-glass
DNDouble notched ASTMC1292-00 & C1425-99
SLOSingle lap off set
DLODouble-lap offset
SLSingle lap offset
BTBrazilian test
4
3
18
10
10
10
10
o10
i810
5
25
12
5
10
3
5
10
10
6
10
5
6
15
15
44
30
ASTM B 898
15
3
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M.Ferraris-35th ICACCDaytona Beach FL
Thank you for yourattention !
http://www.composites.polito.it
M. Salvo,
V. Casalegno,S. Han,
S. Rizzo,
A. Ventrella,
F. Smeacetto,
& students