Journal
MACROMOLECULAR MATERIALS AND ENGINEERING
Volume 298, Issue 3, Pages 318-327Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/mame.201200028
Keywords
auxetic; piezomorphic; polytetrafluoroethylene; polyurethane foams; structureproperty relationships
Funding
- EPSRC [EP/F007906, EP/I02249X]
- Engineering and Physical Sciences Research Council [EP/I02249X/1] Funding Source: researchfish
- EPSRC [EP/I02249X/1] Funding Source: UKRI
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The development of stress-induced morphing materials called piezomorphic materials is reported. The preparation of a piezomorphic material is achieved by introducing spatial dependency into the compliance matrix describing the elastic response of a material capable of undergoing large strain deformation. In other words, it is necessary to produce an elastic-gradient material. This is achieved through modification of the microstructure of the compliant material to display gradient topology. Examples of polymeric (PU) foam and microporous polymer (ex-PTFE) piezomorphic materials are presented. These materials open up new morphing applications where dramatic shape changes can be triggered by mechanical stress.
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