November 2021 Mock Flashcards
Fabrication
Any process where smaller pieces of material or separate parts are joined together to form a larger structure or assembly
Deformation
Any process by which a material’s shape is changed WITHOUT removing material
e.g. Pulling, stretching, folding, crushing
Redistribution
Any process by which materials are melted and liquified and poured into a mould or similar then left to cool in the shape of a new form
Wasting
Any process by which material is removed from a larger piece to arrive at the final shape.
Examples of Fabrication
MIG Welding,
Adhesive
Examples of Deformation
Press Forming,
Rolling,
Spinning
Examples of Redisribution
Sand Casting,
Injection Moulding
Examples of Wasting
Turning (Lathe),
Sawing,
CNC Router,
Routing,
What does ‘BSI’ stand for?
British Standards Insitution
What is the role of ‘BSI’?
BSI’s role is to improve the quality and safety of products, services and systems.
Ductility
Ductility is the materials ability to be bent and deformed without any fracture.
Hardness
Hardness is how resistant a material is to scratches and indentation.
Toughness
Toughness is how well a material can absorb energy
Tensile
A materials ability to be streched and pulled under force without breaking
Tensile Strength test
There are two parts and forces that are part of the test - the amount of force applied and the Elongation of the matieral piece.
- In the first part of the test is a steep straight line, in this area the material behaves elastically.
- Then as the material is pulled to a certain point, plastic deformation occurs and a change in the amount of force shown.
- After a certain strain, the force increases again gradually, as a result the peice strain hardens, the piece now gets longer and thinner keeping its cylindrical shape.
- A neck now forms in at a point in the piece, all strain is now moved to one point in the material called the neck.
- The test piece then fractures at the neck.
