Showing papers in "Journal of Biomechanics in 1972"

TL;DR: Solutions for the indentation of the layer by the plane end of a rigid circular cylinder and by a rigid sphere are suggested as useful for the determination of the elastic shear modulus of intact cartilage.

TL;DR: Three complementary in vivo experiments using dog ulnas demonstrated that adaptive hypertrophy of long bones is provoked only by intermittent compressions and not by static compression.

TL;DR: A simple possible form of the strain energy function for soft biological tissues is studied and the similarity of the result of an example problem to experimental results is encouraging.

TL;DR: The results show that tension in the tensor faciae latae can very effectively serve to counteract bending stresses in the femur while also reducing the strain energy.

TL;DR: A constitutive equation for collagen fibers is developed in the form of the ‘quasi-linear’ viscoelasticity law suggested by Y. C. Fung to predict the experimental responses of tests of collagen fiber bundles extracted from the tails of mature rats.

TL;DR: An elastic perfectly plastic mathematical model for the behavior of bone tissue is presented in an attempt to reconcile previous discrepancies in the literature in the calculated ultimate tensile strength from bending and tensile tests.

TL;DR: The objective of Part I of this paper is to present the analytical basis for a measurement system which incorporates an instrumented spatial linkage capable of taking into account all six degrees of freedom to accurately measure the motion permitted by any anatomical joint.

TL;DR: The knee joints of live guinea pigs, subjected to repeated longitudinal impaction, developed obvious cartilage degeneration over a 3 week period, Associated with, and slightly preceding the earliest cartilage changes, as judged histochemically, was a stiffening of the underlying subchondral bone.

TL;DR: In this paper, the location and size of the contact areas in cadaver knee joints were measured for a load of 150 Kgf applied for 5 sec down the long axis of the tibia.

TL;DR: Recordings of the vertical component of force exerted in walking by normal and pathological subjects have been analysed into harmonic components and described by other mathematical parameters which help to classify different kinds of waveforms of gait.

TL;DR: It is concluded that the nonlinear effects of finite vessel wall displacements are of importance in determining arterial pulse propagation behavior, at least in the more distensible central vessels.

TL;DR: An analysis of the force actions at the temporomandicular joint is presented using linear programming methods to determine the minimum joint forces as a function of occlusal load.

TL;DR: It is demonstrated that, given a uniform remodeling imbalance throughout the skeleton, osteoporosis would develop faster in Haversian bone than in cancellous bone, and a ‘cure’ would show greater results in the most porous regions of the skeleton.

TL;DR: The critical angle reflection technique was used to determine longitudinal and shear sonic velocity components in the exposed surface of bovine incisors along the tooth axis and perpendicular to it, demonstrating strong evidence of anisotropy.

TL;DR: An analysis of cell deformation as a function of shear stress gives a modulus of elasticity for cell membrane of approximately 10 4 dyn/cm 2 if a membrane thickness of 0·01 μm is assumed.

TL;DR: The finite element analysis of the left ventricle is effectively able to incorporate the effect of variations in the curvature of theleft ventricular wall boundary on the stress distribution across the wall thickness and on, the level of stress concentrations.

TL;DR: In this paper, the strength characteristics and composition of bone substance are discussed in relation to its fracture characteristics, and procedures for estimating the toughness and fracture energy in directions parallel to and transverse to the direction of fibreing are introduced.

TL;DR: The design of the instrumented spatial linkage used to make the measurements and the use of the linkage data to determine both the gross relative motion of the scapula with respect to the humerus and the detailed relative motion between the two articulating surfaces of the shoulder joint are described.

TL;DR: The model provides a rigid body idealization of human locomotion and a rational tool for design of prosthetic devices and walking machines.

TL;DR: The relationship between the rigidity of a fracture callus and the percentage of healing has an hyperbolic pattern and is dominated by cases where the fracture is maintained by a plate.

TL;DR: A method is given based on the technique of finite elements which determines theoretically the mechanical behaviour of a lung-shaped body loaded by its own weight, which has been compared with actual measurements of alveolar size and pleural pressures in animal lungs.

TL;DR: Investigation of semiconductor strain gauges bonded with acrylic adhesive to the bone of thoracic vertebral bodies in live sheep indicated that the bone was never static but constantly subject to cyclic deformation during respiration and locomotion.

TL;DR: The dynamic characteristics of the proximal arterial system are studied by solving the nonlinear momentum and mass conservation equations for pressure and flow for a model systemic arterials system that includes the aorta, common iliacs, and the internal and external iliac arteries.

TL;DR: A transcendental equation for the complex shear modulus is established in terms of probe displacement and force amplitude ratio and phase lag and is solved for specific test data.

TL;DR: Numerical computational techniques for obtaining the unsteady viscous-flow field in plane two-dimensional conduits with stenoses are presented and results calculated for an oscillatory pressure gradient at a particular frequency are detailed for a square hump.

TL;DR: Results indicate a definite stiffening of the tissue with increasing rates of strain; the stress-strain law exhibits an exponential character.

TL;DR: Hill's three-component model for cardiac muscle, incorporating Huxley's sliding filament theory for the contractile element (CE) is extended to study the forcevelocity relation, finding the hyperbolic relation is not found in force-velocity curve obtained by afterloaded isotonic contraction.

TL;DR: Biophysical properties of bone in the femur and tibia of the rat were measured during the life span of from 2–6 months during normal aging and exposure to 20 and 25 Hz mechanical vibration to determine the physical, mechanical and histological-physiological parameters of bone.

TL;DR: A simple geometric model of the idealized typical rib is proposed and its features are shown to compare favorably with experimental data, which facilitates the description of typical ribs as structural members in the study of the dynamic structural response of the thorax.