IB Design Technology Topic A3.2.5 Stress, Strain and Material Failure Revision Notes (HL)

IB Design Technology Topic A3.2.5 Stress, Strain and Material Failure Revision Notes (HL) | RevisionDojo

Written by official IB examiners

Stress is force over area; strain is stretch over length

Definition

Stress

A force applied to a material divided by its cross-sectional area. Measured in Pascals (Pa).

Stress is the force divided by the cross-sectional area it acts on: σ = F ÷ A, with F in newtons and A in square metres, giving stress in pascals (Pa).
The same force spread over a smaller area produces a larger stress.

Definition

Strain

The change in length of a material divided by its original length, caused by stress.

Strain is how much the material stretches as a fraction of its starting length: ε = ΔL ÷ L, the change in length over the original length.
Because it divides a length by a length, strain is a pure ratio with no units.

The stress-strain curve and Young's Modulus

Definition

Stress-strain graph

A visual representation of how a material responds to a load.

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Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

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Stress is force over area; strain is stretch over length

Definition

Stress

A force applied to a material divided by its cross-sectional area. Measured in Pascals (Pa).

Stress is the force divided by the cross-sectional area it acts on: σ = F ÷ A, with F in newtons and A in square metres, giving stress in pascals (Pa).
The same force spread over a smaller area produces a larger stress.

Definition

Strain

The change in length of a material divided by its original length, caused by stress.

Strain is how much the material stretches as a fraction of its starting length: ε = ΔL ÷ L, the change in length over the original length.
Because it divides a length by a length, strain is a pure ratio with no units.

The stress-strain curve and Young's Modulus

Definition

Stress-strain graph

A visual representation of how a material responds to a load.

Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Note

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam quis nostrud exercitation.

Excepteur sint occaecat cupidatat non proident

Tip

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

A. Design in theory8 subtopics

B. Design in practice8 subtopics

C. Design in context8 subtopics

IB Design Technology Topic A3.2.5: Stress, Strain and Material Failure Notes

A. Design in theory8 subtopics

B. Design in practice8 subtopics

C. Design in context8 subtopics

Stress is force over area; strain is stretch over length

The stress-strain curve and Young's Modulus

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

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Stress is force over area; strain is stretch over length

The stress-strain curve and Young's Modulus

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account