Question Bank: Selection Flashcards
What is meant by a hybrid material?
A material that combines two or more materials to form a new material with different properties
Describe a typical material classification scheme.
Metals
Polymers - Hybrids - Ceramics
Elastomers Glasses
During the translation stage of material selection, what is meant by a constraint? Give two common examples.
A non-negotiable condition that must be met.
Maximum force without yielding
Minimum toughness value
During the translation stage of material selection, what is meant by an objective? Give two common examples.
Some attribute of a component that should be maximised or mimized. E.g. mass or cost
During the translation stage of a material selection, what is meant by a free variable?
Some attribute of a component that can be altered by the designer without limit
The design of a component to be used in tension is strength-limited. What is the constraint equation?
(F/A) <= σf
What is meant by the specific strength of a material?
The strength per unit mass of material
What is meant by the specific stiffness of a material?
The elastic modulus per unit mass of material
