biomechanics - lunds tekniska högskola · lecture1.ppt author: ingrid svensson created date:...
TRANSCRIPT
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Biomechanics
•! applies mechanics to biology
•! physiological and medical
applications are the main points in this course
Biomechanics
Biomechanics is the science
that examines forces acting upon and within a biological structure and effects produced by such forces.
B.M. Nigg
Historical background !!Leonardo da Vinci, 1452-1519 !!Andreas Vesalius, 1514-1564 !!Galileo Galilei, 1564-1642 !!William Harvey, 1578-1658 !!René Descartes, 1596-1650 !!Giovanni Alfonso Borelli, 1608-1679 !!Robert Boyle, 1627-1691 !!Robert Hooke, 1635-1703 !!Isac Newton, 1642-1727 !!Leonard Euler, 1707-1783 !!Thomas Young, 1773-1829 !!Jean Poiseuille, 1797-1869 !!Adolf Fick, 1829-1901 !!....
Leonardo da Vinci
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Andreas Vesalius
Anathomic theatre, Leyden 1610 Galileo Galilei, 1564-1642
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William Harvey, 1578-1658 Giovanni Alfonso Borelli, 1608-1679
The way of solving a Biomechanical problem
1.! How does the construction work mechanically ?
0. Description of the anatomy, the CAD-drawing.
Kinematics
Anatomy Limitations
2. What about the loading ?
Outer forces
Equations of equilibrium (forces) Equations of equilibrium (moments)
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2. What about the loading?
Internal forces
Loading
Loading
Bending
Tension Compression
Ligament
Cartilage Bending
Tension Compression
It is not obvious that the position follows unambiguous from the loading !
ONLY PASSIVE ELEMENTS The position is given from the loading
WITH ACTIVE ELEMENTS The position can be com- pletely different even if the loading is the same
3. Constitutive relations
Mechanical properties of the most important constituents of bone, muscles, tendons, ligaments, cartilage etc. STRAIN
STRESS
STRESS COMPACT BONE (APATITE AND COLLAGEN TENDON
(COLLAGEN)
STRAIN
Assistive technology, can it be an advantage?