1. Shape Memory Alloys By: Chantelle Domingue Michael Bryant
Barrie Valencia
Kevin French
ENGR 45:Properties of Materials
Santa Rosa Junior College, SRJC
11 –

2. What are Shape Memory Alloys
Metals that, after being strained and heated at a certain temperature, return to their original shape.
Nitinol (NiTi): Nickel -Titanium Naval Ordnance Laboratory
Other SMAs include Cu-Zn-Al-Ni and Cu-Al-Ni

3. SMA History
1930s - SMA first accounted for in copper zinc alloys by Arne
Ölander
1960s - William J. Buehler and fellow researches at the Naval
Ordnance Laboratory discovered the shape memory effect
in nickel and titanium.
1970s - NiTi first reported in medical applications
1980s - Experimental orthopedic and orthodontic applications
1990s - the shape memory effect in Nitinol gained greater attention
and used in stent applications and even greater in medicine.

4. Phase Change? First Thought:
Solid to Liquid: Molecular rearrangement occurs
in liquid state
Difference: SMA doesn’t need to revert to liquid
for molecular rearrangement to occur

5. Transition

6. Applications Aerospace Surgical Safety Robotics Appliances Clothing
Structures

7. Aerospace Applications
Skynet-5A
TiNi is used widly in numerous spacecraft through a company called TiNi Aerospace Inc.
Boeing is considering using SMA’s in future aircraft
New Horizons
STEREO

8. Medical Applications
Dental
Surgical Tools
Orthopedic

9. Medical Applications
Cardiovascular
Simon Filter
Stents

10. Safety Applications
Faucets
Valves
Fire Sprinklers

11. Robotics Applications
Actuators
Micromanipulators

12. Appliances, Clothing, Structures

13. Disadvantages of Shape Memory Alloys
More expensive to manufacture and machine than steel and aluminum
Fatigue under multiple cyclic loading
8% Maximum strain recovery
Difficulties programming intermediate motions

14. The Process

16. Bibliography
Photo
(fire sprinkler)
(green ball valve)
(hand crank valve)
(faucet)
(hand in hand)
(hand)
(finger)
(bra)
(glasses)
(butterfly)
info