Unit R014 - Engineering Manufacture - Topic Area 2 - Retrieval A

Mechanical Properties:

Select the mechanical properties of engineering materials.

• Strength

• Elasticity

• Ductility

• Hardness

• Availability

Mechanical Properties -

What is the definition of strength?

• The ability of a material to withstand an applied load or force without failure and/or plastic deformation.

• How strong something is.

• A material that once bent, will bend back.

• The ability of a material to be stretched and drawn into a wire.

Mechanical Properties -

What is the definition of elasticity?

• Any material that is made from an elastomer.

• The ability of a material to maintain its current form after undergoing load or force.

• The ability of a material to return to its original shape once the deforming load has been removed.

• A material that resists oxidisation.

Mechanical Properties -

Ductility is?

• A material that is really hard.

• How ductile something is.

• The ability of a material to be stretched and drawn out into a wire with out failure or fracture.

• The malleability of a material.

Mechanical Properties -

Define hardness.

• How hard a material is.

• A material that is really difficult to extract out of the ground.

• A materials ability to resist abrasion, scratching and surface indentation.

• A material that is really tough.

Manufacturing Properties -

Select the properties below that affect manufacturing.

• Malleability

• Machinability

• Cost

• Sustainability

• Tensile Strength

Answer explanation

Tensile strength is a mechanical property and one that will affect the materials performance in service rather than during manufacturing.

Manufacturing Properties -

Malleability is?

• metals only.

• A material that can be worked, hammered and pressed into shape without fracture.

• How malleable something is.

• Materials that come in liquid form.

Manufacturing Properties -

Machinability is?

• Only appropriate for non ferrous alloys.

• A material that fits on a conventional machine.

• How machinable something is.

• A materials ability to be worked by a machine tool such as drill, lathe or miller.

Answer explanation

Machinable materials are typically seen as the more malleable materials also. This is often, but not limited too, non ferrous metals and there alloys.

Hard materials are generally not considered to be machinable as hard materials can be difficult to cut and shape. This is often materials with high carbon content.

Manufacturing Properties -

Engineers cannot always pick the best material available. One of the reasons for this is cost. Select two important cost considerations with engineering materials.

• The cost to sell the material on should be high so the product appears to he luxurious.

• How expensive is the material to source, extract and purchase initially.

• Cost is not important so long as the customer is happy.

• Is the material expensive to work with. Does it require specialist tooling, machinery or safety measures.

Manufacturing Properties -

Sustainability of a material is?

• A material that's environmental impact is significantly reduced or non existent when it is used and/or sourced.

• A material that can carry a lot of weight.

• The avoidance of a material to deplete (run out) with continued use at a present rate.

• A material that is durable.