This paper investigates the static and dynamic characteristics of precision hydrostatic spindle with a mid-thrust bearing under different working conditions. Firstly, establishes fluid governing equations coupled journal thrust bearings based on orifice restrictors; Reynolds are solved using perturbation finite difference methods to obtain steady transient pressure distribution functions. Then ...

This paper presents a generalized formulation for the problem of buckling optimization of anisotropic, radially graded, thin-walled, long cylinders subject to external hydrostatic pressure. The main structure to be analyzed is built of multi-angle fibrous laminated composite lay-ups having different volume fractions of the constituent materials within the individual plies. This yield to a piece...

Studying animal mechanics is critical for understanding how signals in the neuromuscular system give rise to behavior and how force-sensing organs and sensory neurons work. Few techniques exist to provide forces and displacements appropriate for such studies. To address this technological gap, we developed a metrology using piezoresistive cantilevers as force-displacement sensors coupled to a f...

Unlike mammalian, disc-shaped intervertebral joints (IVJs), the IVJs in fishes are biconid structures, filled with fluid and thought to act as hydrostatic hinge joints during swimming. However, it remains unclear which IVJ structures are dominant in mechanical resistance to forces in fishes, and whether variation in these tissues might impact the function of the vertebral column along its lengt...

An analytical study was conducted on a submersible pressure hull composed of a hybridsandwich cylindrical shell reinforced with circular frames. Unlike most sandwich plates, the hybrid consists of a thin core with thick faces. Hulls fabricated from such plate when employing a visco-elastic core exhibit inherent acoustic damping properties when radiated with external noise. Typically, however, c...

Background: The advances in cytogenetic techniques during the last few years have permitted not only the study of large populations of wild and domestic animals, but also the detection of chromosome anomalies in embryos. Chromosomal abnormalities are the most common cause of embryonic and fetal mortality in mammals. Most reports of chromosome anomalies in parthenogenetic embryos describe numeri...

The size and length effects of an inclusion on multi-pass copper shaped-wire drawing were investigated. For this purpose, an experimental investigation on optimal die half-angle was conducted. Based on experimental data of optimal die half-angle, wire and inclusion deformations, drawing and hydrostatic stress of copper shaped-wires that contain an inclusion were calculated by two-dimensional fi...

We investigate the cross-sectional buckling of multi-concentric tubular nanomaterials, which are called multiwalled carbon nanotubes (MWNTs), using an analysis based on thin-shell theory. MWNTs under hydrostatic pressure experience radial buckling. As a result of this, different buckling modes are obtained depending on the inter-tube separation d as well as the number of constituent tubes N and...

The hydraulic performance and mechanical stability of open fractures are crucial for several subsurface applications including fractured geothermal reservoirs or nuclear waste repositories. Their properties (fluid flow fracture stiffness) both strongly dependent on the geometry. Any change in effective stress impacts aperture thus ability to promote flow. Here, we carried out experiments with s...

Solving the hydroelastic problem by using Ansys System Coupling (Mechanical and CFX) for floating fixed rings of a deformable annular seal made it possible to analyze influence cylindrical shell thickness, inlet outlet edge dimensions, pressure, shaft radial displacement on hydrostatic pressure distribution clearance value length, leakages, stress-strain state, force. The analysis static stabil...