Showing papers in "Journal of Biomechanics in 1969"

TL;DR: The performance of this electrical model is compared extensively to its real counterpart in the following areas: magnitude and phase of input impedances, wave travel along the aorta, and wave shapes of pressures and flows at different locations.

TL;DR: In this article, the relationship between the ash content of rabbits' metatarsals and their modulus of elasticity, static strength, work-to-failure and impact strength was determined.

TL;DR: A computer model is developed which treats the human body as a series of seven links from which reactive forces and torques are computed at each articulation during various simulated materials handling tasks, including an analysis of shearing and compressing forces at the lower lumbar spine.

TL;DR: The dynamic complex shear modulus of in vitro samples of human brain have been measured and preliminary data on in vivo tests on Rhesus monkeys is presented.

TL;DR: Calculations using a fairly simple model show that this mechanism caused by the end-to-end fusion of apatite crystals as the matrix becomes saturated with mineral could be effective in life.

TL;DR: A profile of the anatomy, anthropomctry, growth, and development of the infant and child is brought together to bring together the design for protection against impact forces and for adequate occupant restraint systems.

TL;DR: A mechanical model for the tissue and the mathematical expressions governing the behaviour of this model are considered and experimental verifications of the model and numerical values for some of its parameters are presented.

TL;DR: Several methods for measuring cross-sectional areas of cat extensor digitorum communis tendons were evaluated in terms of repeatability, and it was suggested that dry specimen weight per unit length could be expected to yield the most repeatable single measurements.

TL;DR: The possible locations of brain damage and skull injury are indicated on the basis of the numerical computations of the most improved theoretical model representing the human head when subjected to impulsive external loads.

TL;DR: Good agreement is obtained using Fung's exponential relationship and two numerical parameters are suggested for evaluation of future test data.

TL;DR: The direction of maximum extensibility of the skin is at right angles to Langer's Lines, which further subtantiates the hypothesis that Langer’s Lines represent a preferred orientation of the fibres within the dermis.

TL;DR: An analytic model of the human left ventricularle is presented, which incorporates the three-dimensional shape of the left ventricle and the effects of ventricular wall thickness, which resembles a thick-walled ellipsoid of revolution.

TL;DR: The general pattern of the stress trajectories verify the fact that the internal architecture of a typical bone results from an adaptation of form to the normal static demands of the body weight transmitted through the femur.

TL;DR: The percentage of dark, and intermediate osteons and their fragments, was determined for 53 cross-sections of emhalmed, adult human bone to study the correlations between collagen fibers and mechanical properties of the specimen.

TL;DR: The maximal pulling and pushing forces exerted by 230 subjects were recorded in standing and sitting postures in which the trunk was kept vertical, the upper limbs horizontal and the position of the pelvis fixed.

TL;DR: As a direct continuation of Part I, where the theoretical background for the rheological model was discussed, possible operations on the model are discussed and performed on anterior cruciate ligament preparations from rabbits.

TL;DR: Comparisons demonstrate the existence of significant differences in the values of propagation constant and fluid impedance predicted by the different models, and a comparison of the phase velocity and transmission per wavelength predicted byThe different models is made.

TL;DR: The design of a test arrangement capable of applying different combinations of static and fluctuating loads to the tibia of live rats and highly reproducible fracture data, and endurance limit are obtained.

TL;DR: The purpose of this study is to find a theoretical solution of the entry flow at very low Reynolds numbers, for which no previous solution is known to the authors, and shows that the entry length at low Reynolds number is simply of the order of the tube radius.

TL;DR: A method is offered for the calculation of pressure drop in the capillary as a function of various physical parameters: the red cell volume per unit blood volume, (hematocrit), the ratio of the cell diameter to the blood vessel diameter, and a parameter relating the cell membrane elasticity, plasma viscosity and the cell velocity.

TL;DR: An approximate solution which gives a reasonable representation for flow around a circular post confined between two plates, is extended to construct a periodic solution for the present problem and results are shown to agree substantially with experimental measurements of the resistance.

TL;DR: This survey is concerned with academic and clinical researches related to the problems of gas embolism in the human body which have commonly been regarded as a dreaded complication of a variety of surgical, therapeutic and diagnostic technics.

TL;DR: Results of these computations are presented in graphic form to indicate the influence of each of the various factors which affect the maximum positive and maximum negative pressures developed as a result of the acceleration.

TL;DR: A mathematical elastodynamic model, Baseline I, consisting of eleven degrees of freedom and describing the human skull, brain, spinal cord, neck, arms and torso as a system of discrete masses, linear translational and torsional springs has been developed.

TL;DR: In this study a sinusoidal test is performed upon the knee joints of nine subjects and the resulting data are shown to obey a Maxwell fluid model in which the model coefficients depend upon the absolute value of the knee moment.

TL;DR: Four sagittal plane dimensions of the fifth lumbar and first sacral vertebrae were obtained from lateral X-rays of 36 individuals who had suffered low-back strains while attempting to extend their backs from a flexed position.

TL;DR: Data presented within this paper indicate the recognition of nonlinearities as seen in the measured response of subjects seated erect in several impact and vibrational environments.

TL;DR: An experimental program to evaluate the stresses in orthopedic plaster casts is reported, and conclusions are drawn regarding the suitability of plaster bandage material, and regarding improvements in application technique.

TL;DR: A continuum theory which treats blood as a fluid suspension is used to account for the presence of red cells in blood flow and is used in the paper to develop a theoretical relationship of pressure gradient to blood velocity.

TL;DR: Design criteria are discussed to insure release under conditions of overload regardless of the weight distribution of the body and yet to secure the leg to the ski under the loads needed for maneuvers and under the dynamic loads imposed by the slope conditions.