Notes
Science test review
Content of the notes (6)
Page 1
Mechanical constraints
Compression- crushing or squeezing forces( like crushing a can)
Tension- pulling or stretching force(like pulling a rope)
Torsion- Twisting something( like ringing out a towel)
Deflection- Bending force( like when you jump on a diving board)
Shearing- Cutting force( scissors)
Page 2
Mechanical properties of materials
Ceramics-properties-
Low electrical conductivity
Hardness
high heat resistance
Low/high thermal conductivity
Low resilience(break easy)
No elasticity
Chemical neutralily
Resistance to corrosion
Stiffness
Metal- properties
Hardness
Electrical/thermal conductivity
Magnetic properties
Malleability/ductility
Resisiliance (steel)
Plastics- two types Thermoplastics and thermosetting plastics
thermoplastic properties thermosetting properties- Hardness, Stiffness, Heat resistance, Corrosion resistance, No electrical conductivity, High resilience
Low thermal conductivity
No electrical conductivity
High elasticty
High corrosion resistance
High resilence
Low heat resilence
wood- properties
Hardness
Elasticity
Resilience
Poor thermal conductivity and electrical
Resistance to corrosion
Lightness relative to strength
Page 3
mechanical properties in general
Hardness- ability to resist denting/scratching (ex; a diamond)
Ductility- ability to stretch without breaking (ex; copper)
Elasticity- ability for an object to return back to its original shape( ex; a slinky)
Malleability- ability for a material to bend without breaking
Resilience- a material's ability to resist shock
Stiffness- ability for something to keep its shape
Page 4
Metal treatments
Metal coatings to prevent rust( zinc,galvanization, paint, enamel, grease, resin)
Metal finishings increase durability
Page 5
Plastics 2 types
Thermosetting plastic- doesn't become soft when heated it stays hard.
Thermoplastic- becomes soft when heated to be reshaped