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However, when determining the modulus
of elasticity of lower modulus materials such as plastics,
an extensometer providing a calibrated range of 10% will
normally provide sufficient resolution and accuracy while
still providing larger elongation ranges for determining
elongation at yield and at break. Example of three more
commonly shaped stress-strain curves obtained on plastics,
elastomers and other non-metallics with typical points of
interest identified are shown below.
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