Are Smart Materials Intelligent?by Carolyn Yeates (Group Head, Interdisciplinary Physics Group) Updated by Mark Saxton 2007
(from Inspec Matters issue no.77 - March 1994)
In recent years, there have been significant developments in the science and applications of intelligent, or 'smart', materials. These can be defined as materials with one or more properties (e.g. mechanical, thermal, optical, or electromagnetic properties) that can be varied in a predictable or controllable way in response to external stimuli, such as, for example, stress, temperature, moisture, pH and electric or magnetic fields. Such materials are now used in a vast number of applications, from photochromic lenses for sunglasses to military and aerospace uses.
Smart structures incorporate smart materials and exhibit one or more of the following features:
- sensors or actuators which are either embedded within a structural material or else bonded to the surface of that material
- control capabilities which permit the behaviour of the material to respond to an external stimulus according to a prescribed functional relationship or control algorithm
A smart structure is thus an integrated system comprising actuators, sensors and a control system.
At a more sophisticated level, smart materials become intelligent when they have the ability to respond intelligently and autonomously to dynamically-changing environmental conditions.
The technologies encompassed by intelligent materials are very diverse and include electrorheological fluids, fibrous materials, ceramics, photonics, microsensors, signal processing, piezoelectrics, dielectric elastomers, biomimetics, shape memory alloys, neural networks, nanotechnology, conducting and chiral polymers, liquid crystals, microactuators, biotechnology and information processing.
Potential applications are similarly widespread and have excited interest in industrial, military, commercial, medical, automotive and aerospace fields. Embedded fibre-optic sensing systems are employed in many engineering disciplines to monitor critical characteristics. Several smart skins programmes have been initiated for both civil and military aircraft. Large space structures are also candidates for the incorporation of smart structural systems because of the variable service conditions in which they operate.
Useful Classification Codes and Controlled Indexing Terms
The wide variety of materials and applications results in intelligent materials cropping up in many parts of the Inspec Classification scheme. The most relevant sections are:
- A8185 Intelligent materials (inc. smart materials)
- A7760 Piezoelectricity and electrostriction
- B0585 Intelligent materials (engineering materials science) (inc. electrorheological and magnetorheological fluids, smart materials)
- C3240N Intelligent sensors
- C3260N Intelligent actuators
- E1710 Engineering materials
- E2110 Mechanical structures
- E1610 Inspection and quality control
- E1020 Maintenance and reliability
Inspec has a set of controlled terms for intelligent/smart material technology:
- intelligent actuators
- intelligent materials
- intelligent sensors
- intelligent structures
- intelligent control
Other related areas
There is an extensive range of topics related to intelligent materials/structures. Some of the most useful (and most popular) codes and terms are:
Classification codes
Section A (Physics Abstracts)
- A0670D Sensing and detecting devices
- A4281P Fibre-optic sensors; fibre gyros
- A4660H Electrorheological and magnetorheological fluids
Section B (Electrical and Electronics Abstracts)
- B7230 Sensing devices and transducers
- B7230E Fibre-optic sensors
- B7630 Avionic systems and aerospace instrumentation
Section C (Computer and Control Abstracts)
- C1340E Self-adjusting systems (inc. adaptive systems)
- C3120Z Control of other nonelectric variables (inc. vibration control)
- C3240D Electric transducers and sensing devices
- C3240H Fibre-optic sensors
- C3260B Actuating and final control devices - electric equipment
- C3390 Robotics
- C7420 Computer applications to control engineering
Section E (Manufacturing and Production Engineering)
- E1550 Control technology and theory
- E2160 Micromechanics
- E2200 Mechanical components, systems and devices
- E3030 Construction industry
- E3644V Mechatronics industry
- E3650C Aerospace industry
The Advanced Materials journal in the Key Abstracts series has one particular chapter covering intelligent materials.
Controlled terms
Other controlled terms which may have some connection with smart materials technology include:
adaptive control aerospace control aerospace instrumentation aerospace materials aircraft instrumentation biomimetics biosensors carbon fibre reinforced plastics ceramics composite materials condition monitoring electric sensing devices electroactive polymers electrorheology fault diagnosis fibre-optic sensors fibre reinforced composites magnetostriction maintenance engineering mechatronics micromechanical devices nondestructive testing piezoelectric actuators piezoelectic materials piezoelectric transducers robots strain gauges strain measurement vibration control
Finally, turning to the question posed by the title "Are Smart Materials Intelligent?", we would probably answer "not yet", but major progress has been made in recent years, with increasingly more complex and sophisticated systems under development.
Inspec will continue to cover the interdisciplinary fields of research to keep you up to date with progress towards this goal.
© 2005-2007
Walter Derzko -"Changing the world, one idea at a time"©
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