Forces and stresses Flashcards
What can forces do?
Forces can cause objects and materials to break or change shape.
How does a tension force at on an object?
Tensile forces act to stretch an object and pull it apart
Two examples of how a tensile force is used?
Trampolines use springs with a high tensile strength.
Suspension bridges use cables with high tensile strength to support the weight of the bridge.
How does a compressive force act on an object?
Opposite of tension. Compressive forces are directed towards one another. They act to squish and shorten objects. ——> OBJECT
Example of a compressive force?
Chair legs support the person sitting on the chair. Made from materials with high compressive strength.
How does a sheer force act on an object?
Sheer forces often act in opposite directions. BUT they’re not aligned.
What can sheer forces do?
Sheer forces can cause parts of an object to slide past one another.
Example of s sheer force?
Scissors for cutting.
How does abending force act on an object?
A bending force is a type of sheer force that allows objects to bend.
How does it occur?
Commonly occurs when a load is applies to a certain part of the material.
Example of a bending force?
A bench has to resist bending when someone sits down on it in a certain place.
Describe lamination.
Lamination is a process in which one or more layers are added to a material to form composites.
What is lamination used for?
It is often used to increase strength and rigidity.
An example of lamination?
Plywood is made up of layers of wood that are glued together to resist bending forces.
Lamination in fabrics?
Delicate fabrics use lamination to increase their strength and protection.
What is interfacing?
Interfacing are extra layers of fabric that are stuck or sewn onto the inside of products.
How is interfacing used?
Used in collars, cuffs, pockets, waistbands and button holes.
What is interfacing used for?
Used to improve functionality and aesthetics.
What is webbing?
A fabric that is used woven in a way that gives a very high tensile strength.
What is webbing used for?
It is used in situations where it will be under tension. Such as tow ropes, seatbelts and backpack straps.
What is bending used for?
Bending is used to reinforce and stiffen materials.
Example of bending?
The middle fluted layer of corrugated card is made from a series of bends that add strength. This can be important for heavy loads.
What is folding?
Folding is the bending of a flexible material, so that the two sides of the bend are flat against each other and a line called a crease or fold occurs between them.
