Influence Of Tensile Forces Research Articles

Relative elongation of raw cotton fibers as a result of feathers adhesion and action of tensile forces

The change in the relative elongation of raw cotton fibers as a result of feathers adhesion and the influence of tensile forces is studied. The dependence of the relative elongation of fibers on tensile forces is obtained, taking into account other significant factors. For experimental studies of different varieties of cotton, a test bench is made to determine the resistance forces of the elastic element of the raw material. Keywords:raw cotton, relative elongation, tension, resistance force, elastic element rasulov.ruzimurad@mail.ru

Development of a nerve stretcher for in vivo stretching of nerve fibres

Axons in vitro respond to mechanical stimulus and can be stretched mechanically to increase their rate of growth. This type of accelerated growth under the influence of tensile forces alone appears independent of chemical cues and growth cones. The stretch-growth of axonal tracts ex vivo and their transient lengthening have been discussed in literature extensively; however; evidence of in vivo investigations is scarce. Stretching axons, although practical ex vivo, is more challenging in vivo due to the difficulties of applying in situ axial tensile forces. Here, a technique has been developed to apply axial tensile forces to a peripheral nerve in vivo. A device has been constructed, called a Nerve Stretcher, which makes use of negative gauge pressure to pull sectioned nerve stumps in a confined nerve prosthesis. This article presents the development of this device and a discussion of the methodology used to hold sciatic nerve stumps in a T-shaped nerve prosthesis. The findings of this study will form the basis of future nerve-stretch growth studies.

Vibration and dynamic stability of composite pipelines conveying a two-phase fluid flows

The paper deals with the vibration and dynamic stability of composite pipelines conveying slug flow on viscoelastic foundations. A viscoelastic model of the theory of beams and the Winkler base model are used in the study of pipeline oscillations with a gas-containing slug flowing inside. The Boltzmann-Volterra hereditary theory of the viscoelasticity is used to describe the viscoelastic properties of the pipeline material and earth bases. The effect of gas and liquid phases flow rates, influence of tensile forces in the longitudinal direction of the pipeline, parameters of Winkler bases, parameters of singularity in the heredity kernels and geometric parameters of the pipeline on the oscillations of structures with viscoelastic properties are numerically studied. It is revealed that an increase in the length of the gas slug zone leads to a decrease in the amplitude and oscillation frequency of the pipeline. The critical rates for a two-phase slug flow are determined. It is revealed that an increase in the soil density of the bases leads to an increase in the critical rate of gas flow. It is shown that an account of viscoelastic properties of structure material and earth bases leads to a decrease in the critical flow rate.

Numerical Modeling of pipes conveying gas-liquid two-phase flow

Results of studies of the oscillations of pipelines conveying a two-phase slug flow are presented in the paper. A viscoelastic model of the theory of beams and the Winkler base model are used in the study of pipeline oscillations with a gas-containing slug flowing inside. The Boltzmann-Volterra hereditary theory of the viscoelasticity is used to describe the viscoelastic properties of the pipeline material and earth bases. The effect of gas and liquid phases flow rates, influence of tensile forces in the longitudinal direction of the pipeline, parameters of Winkler bases, parameters of singularity in the heredity kernels and geometric parameters of the pipeline on the oscillations of structures with viscoelastic properties are numerically studied. It is revealed that an increase in the length of the gas bubble zone leads to a decrease in the amplitude and oscillation frequency of the pipeline. The critical rates for a two-phase slug flow are determined. It is revealed that an increase in the soil density of the bases leads to an increase in the critical rate of gas flow. It is shown that an account of viscoelastic properties of structure material and earth bases leads to a decrease in the critical flow rate.

The influence of tensile forces on the deflection of circular diaphragms in pressure sensors

It is known that the deflection of a diaphragm is determined by two mechanisms, bending moments or bending stress and tensile forces or membrane stress. Usually the influence of tensile forces is not taken into account when calculating the mechanical properties of thin diaphragms. Hence the mathematical description thus obtained will only be valid if the deflection of the diaphragm is small compared with its thickness and if lateral stress is absent. In this paper we will consider uniformly loaded circular diaphragms, which are assumed to be isotropic, and present the results of a study on the influence of bending stress and tensile stress, which together determine the diaphragm deflection. Starting from theoretical considerations, a simulation program is developed of which several results are presented and discussed.