2004 flexural and peel properties of high performance mg/carbon-fiber/peek laminated composites 1,2...
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中國材料科學會 2004年年會暨國科會研究成果發表會Flexural and Peel Properties of High Performance Mg/Carbon-Fiber/PEEK Laminated Composites
郭木城 1,2 黃至青 1
1 國立中山大學材料科學研究所 2 崑山科技大學高分子材料系NSC 92-2216-E-110-017
Tel: (07)5254070 [email protected]
Abstract
Mg/Carbon-Fiber/PEEK laminated composites were successfully fabricated through simple hot pressing. The flexural and peel properties of this Mg based laminated composites are examined and analyzed. The flexural stress and modulus along the longitudinal direction are 960 MPa and 54.6 GPa, respectively, suggesting a sufficiently high resistance against bending deflection. The peel strength is about 150 N, superior to that of the epoxy-resin-adhered Al/CFRP laminated composites. 2.7-2.8 mm
CF/PEEK prepreg thickness 0.5-0.6mm
AZ31 Sheetthickness 0.5-0.6 mm
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Schematic drawing of the Mg based laminated composite, layers 1, 3 and 5 are Mg and layers 2 and 4 are APC-2 (with 4 foils). The longitudinal (L) direction is indicated.
ExperimentalFlexural TestThree-point bending tests according to ASTM D 790-02.Span-to-depth ratio 28:1; strain rate 1.7x10-4 s-1. Peeling TestT-peel tests according to ASTM D1876-95.
The fractured Mg/CF/PEEK laminated composites for the longitudinal configuration of carbon fibers. The loading direction is indicated.
The fractured Mg/CF/PEEK laminated composites for the transverse configuration of carbon fibers. The loading direction is indicated.
0 50 100 150 2000
1
2
3
4
5
6
7 Max. peeling force, 6.63 N/mm
Pee
ling
For
ce, N
/mm
Elongation, mm
Peeling test results conducted on Mg/CF/PEEK laminated composites along the transverse direction.
OM micrograph taken from the peel-tested specimen, Mg layer without CrO3 etching .
Summary
1. The Mg/CF/PEEK Mg based laminated composites were successfully fabricated through a simple hot pressing method. This promising method can fabricate high performances and low density laminated composites in terms of tensile as well as flexural properties.
2. The flexural modulus, stress and strain along the longitudinal and transverse directions of the Mg based laminated composite are 54.6 GPa, 960 MPa and 0.03; and 36.5 GPa, 318 MPa and 0.07, respectively. The current laminated composite shows sufficiently high resistance to bending deflection.
3. Multiple fracture modes are observed in the longitudinal flexural specimen, while a more simple behavior is seen in transverse counterpart.
4. The peel strength of the Mg/APC-2/Mg laminate is superior to that of the epoxy-resin-adhered Al/CFRP laminated composites.
5. Pretreatment of the Mg sheets with or without CrO3 etching
shows significant differences in terms of the resulting interfacial bonding between Mg and APC-2.
Acknowledgement
The authors gratefully acknowledge the sponsorship from National Science Council of Taiwan, ROC, under the project numb
er NSC 92-2216-E-110-017.
Results
0.000 0.005 0.010 0.015 0.020 0.025 0.030 0.0350
200
400
600
800
1000 Flexural Stress at Break 960 MPa
Fle
xura
l Str
ess,
MP
a
Flexural Strain
Flexural stress of the Mg/CF/PEEK Mg based laminated composite along the longitudinal direction.
0.0000 0.0005 0.0010 0.0015 0.0020 0.0025 0.00300
20
40
60
80
100
120
140
160
180
54.6 GPa
Flex
ural
Str
ess
MPa
Flexural Strain
Flexural Modulus
Flexural modulus of the Mg/CF/PEEK Mg based laminated composite along the longitudinal direction.
0.00 0.02 0.04 0.06 0.08 0.100
50
100
150
200
250
300
350
Flex
ural
Str
ess,
MPa
Flexural Strain
Max. Flexural Stress 318 MPa
Flexural stress of the Mg/CF/PEEK Mg based laminated composite along the transverse direction.
0.0000 0.0005 0.0010 0.0015 0.00200
10
20
30
40
50
60
70
80
36.5 GPa
Flex
ural
Str
ess,
MPa
Flexural Strain
Flexural Modulus
Flexural modulus of the Mg/CF/PEEK Mg based laminated composite along the longitudinal direction.
0 20 40 60 80 100 120 140 1600.0
0.5
1.0
1.5
2.0
2.5
3.0Max. peeling force, 2.73 N/mm
Peel
ing
Forc
e, N
/mm
Elongation, mm
Peeling test result conducted on Mg/CF/PEEK laminated composites along the longitudinal direction.
OM micrograph taken from the peel-tested specimen, Mg layer with CrO3 etching . The
lighter-contrasted PEEK resin and the broken carbon fibers adhered on the Mg phase.
OM micrograph taken from the peel-tested specimen, APC-2 layer. The PEEK resin and carbon fibers were peeled from the APC-2 prepreg.