SmartFlex®Wire“100% quality controlled Shape

Memory Wire for microactuators”

General Features

£ The smallest powerful electricalactuator

£ Direct linear or angular motionusing a thin wire

£ The simplest solution

Simple mechanism withoutbulky gears

£ The silent solution

No noise emission duringactuation

£ Nature‐like movement

Smooth and controlled action

HIGHLIGHTS

0

0,5

1

1,5

2

2,5

3

3,5

4

4,5

5

0 1 2 3 4 5 6 7 8

Time [sec]

Stro

ke [%

]

Electrical

0

0,5

1

1,5

2

2,5

3

3,5

4

4,5

5

0 1 2 3 4 5 6 7 8

Time [sec]

Stro

ke [%

]

Electrical

pulsecurrentLoad

C u r r en t s w it c h-o ffC u r r en t s wit ch- on

Load

Load

Contraction

Elo

ngation

Load

Product Diameter[μm]

Diameter[inch]

Max Force

[N]

Max Stroke

SuggestedoperatingForce [N]

Suggestedoperating

StrokeSmartFlex25 25 0,001 0,3

5%

0,1

<3,5%

SmartFlex50 50 0,002 1,2 0,3SmartFlex76 76 0,003 2,7 0,8SmartFlex01 100 0,004 4,7 1,3SmartFlex015 150 0,006 6,2 2,7SmartFlex02 200 0,008 19 5SmartFlex03 300 0,012 42 12SmartFlex04 400 0,016 75 21SmartFlex05 500 0,020 118 33

SMA actuators present a very high specific working output confronting the otheractuator’s technologies

SMA Straight w

ire

WAX A

ctuat

ors

Magnetic Solenoid

SMA Coil S

prings

Ther

mos

tat M

etal

s

1

10

100

0,1 1 10 100

1000

1000

Ou

tpu

t (N

)

Weight (g)0,01

Best efficiency as microactuators

Comparison of technologies

Typical electrical actuation

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SMARTFLEX SPRINGS AND WIRES 2014_Layout 1 13/05/2014 10:36 Pagina 1

SmartFlex®Wire

The SAES Groupmanufacturing companiesare ISO9001 certified, theAsian and Italian companiesare also ISO14001 certified.Full information about ourcertifications for eachcompany of the Group areavailable on our website at:www.saesgroup.com

D.SMA.93.1.14

Resistivity of the material changes during martensitic transformation showing thebelow behaviour

Resi

stiv

ity (μΩ

cm)

Temperature (°C)

80

85

95

110

100

105

0 20 40 60 80 100 120 140

90

80

85

95

110

100

105

0 20 40 60 80 100 120 140

90

Life cycles depend on a stress‐strain trade‐off.A strain increase needs a stress decrease to achieve

a good fatigue performance

50

150

250

350

450

0 1 2 3 4 5

Strain [%]

Stre

ss [M

Pa]

cycles < 30k

cycles > 100k30k < cycles < 100k

1Million cycles

Transformation temperature of a SmartFlex wire loaded of different stress level

100

200

300

400

500

40 60 80 100 120 140

Temperature [°C]

Stre

ss [M

Pa]

AsAfMsMf

⎥⎦

⎤⎢⎣

⎡°

=C

MPadTd

2.8σ

AsMf

Ms Af

0

100

200

300

400

500

40 60 80 100 120 140

Temperature [°C]

Stre

ss [M

Pa]

AsAfMsMf

⎥⎦

⎤⎢⎣

⎡°

=C

MPadTd

2.8σ

⎥⎦

⎤⎢⎣

⎡°

=C

MPadTd

2.8σ

⎥⎦

⎤⎢⎣

⎡°

=C

MPadTd

2.8σ

AsMf

Ms Af

0

Transformation temperatures

Resistivity

Fatigue behavior

SAES Groupwww.saesgroup.comsma@saes‐group.com

© SAES Group. Printed in Italy. All rights reserved. SAES® and SmarFlex® are registered trademarks of SAES Group. SAES Group reserves the rightto change or modify product specifications at any time without notice.

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SMARTFLEX SPRINGS AND WIRES 2014_Layout 1 13/05/2014 10:36 Pagina 2

SmartFlex®Springs“Shape Memory Springs for

Actuators”

Springs vs. Wire

£ Higher Stroke

£ Lower Force

£ Indirect Heating

£ Sensor ‐ Actuator

£ Customization

Applications

£ Thermal valves

£ Thermal actuators

£ Antiscald devices

£ Mixing valve

£ Active air vents

£ Fire protection device

HIGHLIGHTSAs thermal‐actuators SMA springs are very specific products. The combination ofcomposition, heat treatment and operating conditions permits to cover a wide range ofactivation temperatures. Customized solutions may be developed to fulfill severalapplications.

At low temperature the Martensite phase presents low force.At high temperature the Austenite phase presents high force.The spring moves continuously between such extreme positions in noiseless operationwith a typical hysteresis of 15‐20°C.

As thermal‐actuator SMA spring follows the typical hysteresis curve duringtransformation according to the selected alloy.

Typical Hysteresis curve of BT (body Temperature) Compression Spring

LS

L0

High Force

Low Force

Spring forceIncrease

-40 -20 0 20 40 600

50

100

Temperature [°C]

Austenite Martensite

Different Alloy for different activation temperature from As=10°C to As=90°C

-20 0 20 40 60 80 120

0

5

10

20

30

15

25

35

100

Temperature [°C]

Str

oke [

mm

]

-20 0 20 40 60 80 120

0

5

10

20

30

15

25

35

100

Temperature [°C]

Str

oke [

mm

]

-20 0 20 40 60 80 120

0

5

10

20

30

15

25

35

100

Temperature [°C]

Str

oke [

mm

]

Alloy BD ◊ As 10°C

Alloy BD ◊ As 20°C

Alloy BD ◊ As 30°C

Alloy B ◊ As 60°C

Alloy BH ◊ As 90°C

Alloy BD ◊ As 10°C

Alloy BD ◊ As 20°C

Alloy BD ◊ As 30°C

Alloy B ◊ As 60°C

Alloy BH ◊ As 90°C

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SMARTFLEX SPRINGS AND WIRES 2014_Layout 1 13/05/2014 10:36 Pagina 3

SmartFlex®Springs

The SAES Groupmanufacturing companiesare ISO9001 certified, theAsian and Italian companiesare also ISO14001 certified.Full information about ourcertifications for eachcompany of the Group areavailable on our website at:www.saesgroup.com

SAES Groupwww.saesgroup.comsma@saes‐group.com

© SAES Group. Printed in Italy. All rights reserved. SAES® and SmarFlex® are registered trademarks of SAES Group. SAES Group reserves the rightto change or modify product specifications at any time without notice.

D.SMA.100.1.14

Typical Dynamic Mechanical Thermal Spectroscopy (DMTS) analysis of a SMA spring – Alloy BD

-20 0 20 40 60 80

0

10

20

40

60

30

50

70

100

Temperature [°C]

Forc

e [

N]

-40

Hysteresis @ constant Strain

-10

-20 0 20 40 60 80

-1

0

1

3

5

2

4

6

100

Temperature [°C]

Str

ain

[m

m]

-40

Hysteresis @ constant Load

SmartFlex springs can be customized according to your design and applicationrequirements.

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SMARTFLEX SPRINGS AND WIRES 2014_Layout 1 13/05/2014 10:36 Pagina 4