Development and characterization of viscoelastic polydimethylsiloxane phantoms for simulating arterial wall motion

Arterial wall viscoelasticity is likely to be a good diagnostic indicator of vascular disease, but only a few studies on the assessment of wall viscosity have been performed. Artery phantoms are manufactured using polydimethylsiloxane (PDMS) to simulate the viscoelastic characteristics of the artery wall, which depends on the wall tissue composition and progression of atherosclerosis.…

The influence of the pre-organized cracks in the tensile zone of the reinforced concrete beam under statically short-term loading

The experimental and theoretical research of the single-span reinforced concrete beam with artificial flaw in tension area under the action of static short-term loads is performed. The stress-strain state of the structure, based on numerical simulation using finite element software system ANSYS, is investigated. The results of numerical simulation are compared with the experimental results.…

Experimental investigation of deflected mode of the reinforced concrete beams with organized cracks under long-term loading

The experiments confirmed the hypothesis about the beams rigidity with pre-organized cracks in comparison with stochastic cracks under the influence of long-term loading. As a result, the beams with pre-organized cracks provide the smaller deflection after long-term period than the beams without organized cracks. Thus, the proposed method of the deflections calculation of the reinforced…

Design Solutions of Unique Buildings and Structures

The paper describes a new design solution of diaphragm stiffness for a multistory building, including a high-rise building, which eliminates the possibility of its combined action with the frame of the building on the vertical loads. This is achieved by the design of elements of shear wall coupling and current methods of determining wind effects…

Deformation of reinforced concrete beams with forming elements under long-term loading

This paper deals to problems of studying cracks in reinforced concrete beams under long-term loading by fundamental of reinforced concrete resistance theory (energy approach) was describe. The experimental study of bearing capacity of reinforced concrete beams with the form of plastic plates (artificial cracks) and without form of plastic plates (artificial cracks) with different coefficients…

Numerical study of the stress-strain state of reinforced concrete beam with pre-organized cracks under short-term and long-term loading

The article investigates the numerical modelling of deformation process and fracture of the reinforced concrete beams with preformed organized cracks and without preformed organized cracks under the action of short-term and long-term loading. Identified that, the features was changed of stress-strain state of beam during the deformation process and the main factors determining process of…

Heat transfer phenomena on waste heat recovery of combustion stack gas with deionized water in helical coiled heat exchanger

Theoretical and experimental studies on waste heat recovery of combustion stack gas and heat transfer phenomena of a fully developed laminar flow of deionized water in vertical helical coils were carried out with coil dimensions: tube diameter to coil diameter, di/D=0.04-0.06 and pitch to coil diameter, p/D=0.1-0.25. The calculation of heat transfer data was based…

Heat transfer characteristics of deionized water-based graphene nanofluids in helical coiled heat exchanger for waste heat recovery of combustion stack gas

Heat transfer phenomena of a fully developed laminar flow of deionized water-based graphene nanofluids (DI-water/GNPs) in vertical helical coils for heat recovery of combustion stack gas was carried out with different helical coil dimensions. The GNPs particle concentrations were 0.05 and 0.08% by weight and the calculation of experimental heat transfer data was based on…

Thermal characteristics of helical coiled heat exchanger with graphene-deionized water on waste heat recovery of combustion stack gas

Overall heat transfer coefficient of helical coiled heat exchanger with graphene- deionized water (DI-water) for waste heat recovery of combustion stack gas including heat exchanger effectiveness, ε, were experimentally carried out. Various sizes of tube diameter (1.2-1.5 cm), coil diameter (19-24.5 cm), and coil pitch (2.8-6 cm) of helical coils 1-4 including different heat transfer…