A Primer of Biomechanics by George L. Lucas M.D., Francis W. Cooke Ph.D., Elizabeth A.

By George L. Lucas M.D., Francis W. Cooke Ph.D., Elizabeth A. Friis Ph.D. (auth.)

A PRIMER OF BIOMECHANICS is the 1st quantity of its style to provide the rules of biomechanics with a hugely scientific orientation. Dr. Lucas and his colleagues (specialists in biomechanics) have assembled a pragmatic advisor using case displays to make this very technical and complex fabric palatable to the orthopaedic resident and practitioner. This "user-friendly" textual content is additional stronger through good built-in chapters overlaying all of the simple fabrics and the newest info of this quickly evolving box from the point of view of its beneficial program. each one case presentation is by means of an in depth, yet simply comprehensible clarification of the biomechanical ideas concerned and contains protocols for therapy. This quantity is a must have for orthopaedic citizens and practitioners.

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For a given force, specimens oUhe same A o and the same material will experience different deformations, depending on the length of the specimen. The letter "a" represents data for the specimen of original length ' 0 ; "b" represents data for the specimen of original length 2/0 , In order for specimens of varying original lengths to be fairly compared , one must normalize deformation to the original specimen length . Strain is the normalization of deformation to original specimen length and is commonly referred to by the Greek letter e.

7). Applying an axial load of force F to each speci- 42 3. 7. A spec imen of the same original length and material will deform only one-ha lf as much if the cross-sect ional area is doubled. men, one now finds that the specimen with twice the cross-sectional area experiences only half the deformation of the other specimen. 8), one finds that force is no longer proportional to strain for specimens of the same material and length with different cross-section al areas. Therefore, in order to characterize a materia l properly regardless of the size or shape of the specimen, the applied force must be normalized to the original cross-sectio nal area.

6). Both specimens are experiencing the same strain given the same applied load, F. ~ Strain is change in length normalized to the original length. 6. For specimens of the same cross-sectional area and material, the applied load is proportional to the strain regardless of original specimen length. The letter "a" represents data for the specimen of original length ' 0 ; "b" represents data for the specimen of original length 2/0 , Because length is normalized to length, the units of strain are dimensionless, that is, there are no units.

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