m.ferraris-35th icacc daytona beach , fl · 2018-01-28 · m.ferraris-35th icacc daytona beach , fl...
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M.Ferraris-35th ICACC Daytona Beach , FL
M.Ferraris-35th ICACC Daytona Beach , FL
X
Z Y
Comparison of shear strength tests
A4PB Asymmetrical four-point bending test (ASTM C1469)
TC Torsion cylinder
TT Torsion Tube
TS Torsion square
THG Torsion hour-glass
DN Double notched ASTM C1292-00 & C1425-99
SLO single lap off
set ASTM D905-03
DLO Double-lap offset
SL Single lap offset
BT Brazilian test ASTM B 898
M.Ferraris-35th ICACC Daytona Beach , FL
X
Z Y
Comparison of shear strength tests
A4PB Asymmetrical four-point bending test (ASTM C1469)
TC Torsion cylinder
TT Torsion Tube
TS Torsion square
THG Torsion hour-glass
DN Double notched ASTM
C1292-00 & C1425-99
SLO Single lap off set
DLO Double-lap offset
SL Single lap offset
BT Brazilian test
4 3
18
10
10 φ 10
10
φo 10
φi 8 10
5
25
12 5
10
3
5
10
10 6
10
5
6
φ 15
3
15
15
4 4
30
ASTM B 898
A4PB Asymmetrical four-point bending test (ASTM C1469)
M.Ferraris-35th ICACC Daytona Beach , FL
X
Z Y
Comparison of shear strength tests
A4PB Asymmetrical four-point bending test (ASTM C1469)
TC Torsion cylinder
TT Torsion Tube
TS Torsion square
THG Torsion hour-glass
DN Double notched ASTM
C1292-00 & C1425-99
SLO Single lap off set
DLO Double-lap offset
SL Single lap offset
BT Brazilian test
4 3
18
10
10 φ 10
10
φo 10
φi 8 10
5
25
12 5
10
3
5
10
10 6
10
5
6
φ 15
3
15
15
4 4
30
ASTM B 898
the adhesive is a “ model” joining material to obtain a 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)
M.Ferraris-35th ICACC Daytona Beach , FL
4P- Asy: Notches needed, not suitable for strong joints, pure shear
•different tests give different results on identical samples
•PROs and CONs of each test for a specific joint must be evaluated
Single lap (SL): Critical alignment joint/fixtures Not 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) 182–191 •A. Ventrella et al., J Mater Sci (2010) 45:4401–4405 •E. Martin et al., submitted to Materials Characterization (2010)
M.Ferraris-35th ICACC Daytona Beach , FL
C/C test efficiency %
Ceramics test efficiency
% DN 16,29 ± 3,30
(33,02 ± 4,98 *) 80%
TS
Not suitable 0% Not suitable 0%
TC
19.7± 5.4 70% 53,7±9.4 80%
BT 32±2.6
B898 22,2±6.67
SL 18.3 ± 1.9 (10.45± 2.68 *)
55% 45,8 ±3,5 25 %
SLO 20.4±2.0 (28,00±2,15*)
80 % 52.3± 6 75%
DLO 12.2 ± 0.9 85% 29.4± 7.6
70%
test efficiency % (number of samples broken inside the joint /
total number of prepared samples, %)
( *) = misplaced notches for DN, misaligned fixtures for SL, fixture-sample friction for SLO
C/C
Multiplicative factor
Ceramics
TC 19.7± 5.4 x 2.5 ~ 53,7±9.4
SL 18.3 ± 1.9 x 2.5 ~ 45,8 ±3,5
SLO
20.4±2.0 x 2.6 ~
52.3± 6
DLO
12.2 ± 0.9
x 2.4 ~ 29.4± 7.6
ASTM F734-95(2006) and
F1362-97(2003)
Torsion Test
Test rig for the torsion test
M. Ferraris torsion tests for joined CMC and ceramics:
M.Ferraris-35th ICACC Daytona Beach , FL
Torsion Tests on epoxy joined SiC tubes
M.Ferraris-35th ICACC Daytona Beach , FL
Torsion Tests on epoxy joined SiC hour glasses
M.Ferraris-35th ICACC Daytona Beach , FL
M.Ferraris-35th ICACC Daytona Beach , FL
X
Z Y
Concluding remarks:
A4PB Asymmetrical four-point bending test (ASTM C1469)
TC Torsion cylinder
TT Torsion Tube
TS Torsion square
THG Torsion hour-glass
DN Double notched ASTM
C1292-00 & C1425-99
SLO Single lap off set
DLO Double-lap offset
SL Single lap offset
BT Brazilian test
4 3
18
10
10 φ 10
10
φo 10
φi 8 10
5
25
12 5
10
3
5
10
10 6
10
5
6
15
15
4 4
30
ASTM B 898
φ 15
3