JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - 58

SMPs
it became hard again, resulting in an exact copy of the cavity. Filament was twined onto the SMP mandrel to form a composite part. After curing the composite, the SMP mandrel was reheated above Ttrans. This allowed the mandrel to return to its original shape for easy extraction. Figure 6 shows the carbon fibre reinforced composite parts which were formed from the shape-memory mandrels next to them.

a

Other applications

Fig. 5: Photograph of the original and morphing configurations of the variable camber wing [2]

skin, a metal sheet and a honeycomb structure. The metal sheet replaces the traditional hinges and keeps the surface smooth during the camber change. Honeycomb, which is high-strain capable in one direction without dimensional change in the perpendicular in-plane axis, provides distributed support to the flexible skin. The flexible SMP skin covers the wing to create a smooth aerodynamic surface.

b As a novel kind of smart material, SMPs currently Fig. 6: Carbon fibre reinforced composites cover a broad range of parts and the corresponding mandrels application areas ranging a) Multi-shaped parts b) Bottle-shaped parts from outer space to automobiles. In addition to the above-mentioned applications, SMPs are also used in the following sectors: booms, antennas, grippers, mirrors, optical reflectors, intravascular delivery systems, hood/seat assemblies, adjustable automotive brackets, biomedicine products, self-healing composite systems, smart textiles and fabrics, shape-memory toys, and automobile actuators. n
More information: smart.hit.edu.cn Contact: lengjs@hit.edu.cn References

Smart mandrels
Mandrels with sophisticated structures are used to fabricate moulded or filament-wound composite parts. Conventional mandrel processes use multi-piece metal or water-soluble mandrels. This solution is usually costly and requires substantial time and energy to remove the mandrels. For some multi-shaped aircraft parts such as air ducts, and bottle-shaped parts, it is quite difficult to lift out the mandrels. Due to their large reversible deformation properties, SMPs can be used to design smart mandrels with complicated shapes and further facilitate their extraction. These mandrels can maintain their dimensional accuracy like a traditional mandrel while being rapidly removable and reusable at low cost. This way, SMP hollow mandrels were heated above Ttrans, the temperature at which the SMP becomes flexible and can expand in the limit of a metal mould with a cavity in the desired mandrel shape. The SMP was then cooled until

1 . Leng J. S., Du S. Y. Shape-Memory Polymers and Multifunctional Composites. CRC Press /Taylor & Francis, 2010

2 . Leng J. S., Lan X., Liu Y. J., Du S. Y. Shape-Memory Polymers and Their Composites: Stimulus Methods and Applications. Progress in Materials Science, 2011, 56, 1077-1135 3. Liu Y. J, Lv H. B, Lan X., Leng J. S, Du S. Y. Review of Electro-Active Shape-Memory Polymer Composite. Composites Science and Technology, 2009, 69, 2064-2068 4 . Yu K., Zhang Z. C., Liu Y. J., Leng J. S. Carbon Nanotube Chains in a Shape Memory Polymer/Carbon Black Composite: to Significantly Reduce the Electrical Resistivity, Applied Physics letters, 2011, 98, 074102 5 . Leng J. S., Lu H. B., Liu Y. J., Huang W. M., Du S. Y. Shape-memory Polymer-a Class of Novel Smart. MRS Bulletin, 2009, 34, 848-855

58 jec composites magazine / No72 April - May 2012


http://smart.hit.edu.cn

JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012

Table of Contents for the Digital Edition of JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012

Cover
Edito
Point of view: Toray believes in Europe
Contents
Agenda of Events
COMPANY & BUSINESS
- In Brief
- Wind energy
APPLICATIONS
- Medical
MARKET
- Carbon survey
- Human ressources
FEATURE AEROSPACE
- Advancement
- Nano
- Thermoplastics
- Autoclave
- Fibre placement
- Lamination
- CNC
- Holding
- Manufacturing
- Sustainability
RESEARCH & DEVELOPMENT
- SMPs
- Damage
TECHNOLOGY & INNOVATIONS
- Coating
- Filament winding
- Natural fibre
Special JEC Asia
- JEC Asia 2012, the place to be
- Aerospace
- Carbon
- Indonesia
Index
In the world
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - Cover
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - 2
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - Edito
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - Point of view: Toray believes in Europe
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - 5
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - Contents
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - 7
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - 8
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - 9
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - Agenda of Events
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - 11
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - - In Brief
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - 13
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - - Wind energy
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - - Medical
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - 16
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - 17
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - 18
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - 19
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - 20
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - - Carbon survey
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - 22
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - 23
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - 24
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - - Human ressources
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - 26
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - 27
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - - Advancement
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - 29
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - 30
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - - Nano
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - 32
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - 33
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - - Thermoplastics
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - 35
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - 36
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - 37
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - - Autoclave
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - 39
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - 40
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - - Fibre placement
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - 42
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - 43
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - - Lamination
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - 45
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - 46
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - - CNC
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - - Holding
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - - Manufacturing
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - 50
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - 51
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - - Sustainability
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - 53
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - 54
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - 55
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - - SMPs
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - 57
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - 58
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - - Damage
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - 60
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - 61
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - - Coating
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - 63
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - 64
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - - Filament winding
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - - Natural fibre
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - 67
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - Index
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - In the world
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - - JEC Asia 2012, the place to be
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - 71
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - - Aerospace
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - 73
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - 74
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - 75
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - - Carbon
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - 77
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - 78
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - - Indonesia
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - 80
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - 81
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - 82
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - 83
JEC COMPOSITES MAGAZINE - Issue #72 - April/May 2012 - 84
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