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 type to offer the rules of biomechanics with a hugely scientific orientation. Dr. Lucas and his colleagues (specialists in biomechanics) have assembled a realistic advisor using case shows to make this very technical and complex fabric palatable to the orthopaedic resident and practitioner. This "user-friendly" textual content is additional improved through good built-in chapters masking the entire uncomplicated fabrics and the newest details of this swiftly evolving box from the viewpoint of its worthy program. each one case presentation is by means of an in depth, yet simply comprehensible rationalization of the biomechanical rules concerned and comprises protocols for therapy. This quantity is a must have for orthopaedic citizens and practitioners.
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One more way in which strain is reported is in terms of microstrain. 001 strain . 001 strain = 1,000 ue). We use both percent strain and microstrain values to make the interpretation and presentation of strain values more convenient. 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.
A constant value for a specific linear elastic material, E is a property of the material and is not dependent on the size and shape of the specimen . ~ • One name for the stiffness of a material is Young's modulus, named for Thomas Young, whose first formal studies were in medicine. He received his doctor's degree in medicine in 1796 and later applied his genius to solving problems in the physical sciences and mechanics. 4 MODULUS OF ELASTICITY (OR YOUNG'S MODULUS) The modulus of elasticity of a material, E, is the material property that relates stress to strain.
4) This is in fact an extension of Newton's third law, which we can now state as follows: If the sum of the fo rces is zero, there is no translation , and , if the sum ofthe moments is zero, there is no rotation. In the static case, the moments acting on the body deform the body by bending. Thus, in general, we can say that, under static conditions, collinear forces produce tension or compre ssion, and noncolinear parallel forces produce bending. 3 shows a simplified diagram of a door with its axis of rotation (hinge axis) in the positive y direction.
A Primer of Biomechanics by George L. Lucas M.D., Francis W. Cooke Ph.D., Elizabeth A. Friis Ph.D. (auth.)