ESD-Emerging and Sustainable Technologies flashcards

Emerging and Sustainable Technologies yae

What is the process of all mechanisms?

Input, Process, Output

What are the types of movement in mechanisms?

Linear, Reciprocating, Rotary, Oscillating

What does a linear mechanism do?

Straight line, one direction

What does a reciprocating mechanism do?

Straight line, forwards and backwards movement

What does a rotary mechanism do?

circular movement

What does a oscillating mechanism do?

circular forwards and backwards movement

What is the three parts of a lever?

Effort load Fulcrum

What is the ‘effort’ part of a lever?

The power you put into a lever

What is the ‘Load‘ part of a lever?

The weight of the object moved

What is the ‘fulcrum‘ part of a lever?

The point at which the lever turns or pivots

What is the first class of a lever system

E F L

What is the second class of a lever system

F L E

What is the third class of a lever system

F E L

The formula of mechanical advantage

MA = Load / Effort

The formula of velocity ratio

VR = distant effort moves / distant load moves

What is the type of linkage that goes back and forth

Reverse motion linkage

What is the type of linkage that turns 90 degrees in direction

Bell crank

What is this cam?

Eccentric cam

What is this cam?

Ratchet/snail cam

What is this cam?

Pear cam

What is a pulley?

A wheel with a groove around its edge in which a belt, rope or chain can sit

What is the formula for Speed Ratio

SR = Diameter of driver pulley / Diameter of driven pulley

What are the two parts of a pully (gears)

Driver pully and Driven Pulley

What is this type of gear?

Bevel gear

What is this type of gear?

Worm gear

What is this type of gear?

Rack and pinion gear

What is a smart material?

one which changes its properties in response to a change in environment, reacting to stimuli

What are smart alloy?

A group of alloys which have super elasticity and have Shape memories

What is a nitinol made of?

an alloy made of nickel and titanium

What is a feature of nitinol?

it is biocompatible and a smart alloy with shape memory characteristics.

What are Shape-memory Plastics (SMPs)?

These can be used to sense temperature change because they change shape when a certain temperature is reached.

What can super elasticity do?

undergoes large strains and spring back to their original shape

What is a medical application for nitinol?

used in arterial stents to widen restricted arteries. the mesh stent is compressed and placed inside the artery. it is then warmed which expands to its original shape, pushing against the artery walls, allowing improved blood flow

What is a polymorph?

non-toxic and fully biodegradable polymer, comes in small plastic granules. if heated to 62C the granules fuses to make it moldable, then shaped by hand and is solid when cooled. good for prototyping or making repairs

What are liquid crystal displays (LCDs)?

flat screen displays that are thin, lightweight, energy efficient have this. liquid crystal inside made up of mixture of materials. electric current is applied which modifies the crystal shape, changing image on the screen

What do photochromic pigments do?

reacts to uv to change color. longer exposed, darker it becomes. caused by reaction of light sensitive particles in pigments. used in nail polish, vehicle spray paint, clothing, beach product

What is Quantum tunnelling composite?

An ability to be either a conductor or an insulator

What is Graphene?

an ultra-thin, transparent layer of graphite that is one atom thick and 200 times stronger than steel

What is Cornstarch polymer?

Plastic made from vegetable starches and are fully biodegradable

What are metal foams?

Metals with many gas filled spaces which make the material lightweight

What is a use of metal foam?

Lightweight car parts and bone implants

What is a use of cornstarch polymer?

disposable food and drink containers and bottles

What is titanium?

an extremely corrosion-resistant metal with high strength to weight ratio

What is a benefit of titanium?

It does not react with the human body

What are some uses of titanium?

Artificial joints and dental implants