6834 Lecture Notes - Lecture 8: Triceps Surae Muscle
21 Jun 2018
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BIOMECHANICS 1/G MECHANICS OF BIOLOGICAL SYSTEMS 1
STRAIN
Deformation is the absolute change in length of the material. As materials are of
different lengths which would affect the length change, deformation is presented in
relation to the original length of the material, this is termed Strain. Strain can be
presented in units or typically in percentage.
I.e. if an Achilles tendon had a resting length of 35 cm and following contraction of
the triceps surae its length went to 42 cm.
Its deformation would be 7 cm
Its strain would be 20 % greater than the original length
Linear Strain refers to a change in the objects length. This deformation comes about
because of the stress placed on the material. For example, when a muscle contracts
it exerts a tensile load on the tendons at each end of the muscle, and consequently
the tendons exhibit a tendon strain i.e. they are very slightly stretched.
STRESS AND STRAIN CURVES
The stress and resulting strain of an applied load to a material results in stress /
strain curves. That look like as follows:
The shape of the stress / strain curve provides us with an idea about the properties
of the material. Different stress / strain curves will be shown in subsequent lectures.
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Document Summary
Deformation is the absolute change in length of the material. As materials are of different lengths which would affect the length change, deformation is presented in relation to the original length of the material, this is termed strain. Strain can be presented in units or typically in percentage. I. e. if an achilles tendon had a resting length of 35 cm and following contraction of the triceps surae its length went to 42 cm. Its strain would be 20 % greater than the original length. Linear strain refers to a change in the objects length. This deformation comes about because of the stress placed on the material. For example, when a muscle contracts it exerts a tensile load on the tendons at each end of the muscle, and consequently the tendons exhibit a tendon strain i. e. they are very slightly stretched. The stress and resulting strain of an applied load to a material results in stress / strain curves.
