Shape Memory Alloys By: Chantelle Domingue Michael Bryant Barrie Valencia Kevin French ENGR 45:Properties of Materials Santa Rosa Junior College, SRJC 11 – 27 - 07

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

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.

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

Transition

Applications Aerospace Surgical Safety Robotics Appliances Clothing Structures

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

Medical Applications Dental Surgical Tools Orthopedic

Medical Applications Cardiovascular Simon Filter Stents

Safety Applications Faucets Valves Fire Sprinklers

Robotics Applications Actuators Micromanipulators

Appliances, Clothing, Structures

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

The Process

Bibliography Photo (fire sprinkler) http://www.norcalfire.com/images/sprinkler_1.jpg (green ball valve) http://files.turbosquid.com/Preview/Content_on_12_6_2004_20_32_38/ball%20valves%20monoblock_03.jpg96752c1e-b612-4169-a947-bc2cadc16355Large.jpg (hand crank valve) www.csiheat.com/images/photos2/fbvlve1.jpg (faucet) www.e-zflowplumbing.com/OS28026.gif (hand in hand) http://www.shadowrobot.com/gallery.shtml?gallery=handC&img=HandC_CRW_9344.jpg (hand) http://www.cs.ualberta.ca/~database/MEMS/sma_mems/img/hand31.jpg (finger) http://www.cs.ualberta.ca/~database/MEMS/sma_mems/img/finger.jpg (bra) www.ultimateniti.com/gfx/box_apparel.jpg (glasses) http://image.ecplaza.net/offer/a/alicemyq/2593524.jpg (butterfly) http://www.holbrookandcompany.com/index.html info http://www.stanford.edu/~richlin1/sma/sma.html http://www.cs.ualberta.ca/~database/MEMS/sma_mems/sma.html http://tiniaerospace.com/sma.html http://en.wikipedia.org/wiki/Shape_memory_alloy http://herkules.oulu.fi/isbn9514252217/html/x317.html http://www.nimesis.com/anglais/technique/sma/sma.htm http://www.scielo.br/scielo.php?pid=S0100-879X2003000600001&script=sci_arttext&tlng= http://www.specialmetals.com