scholarly journals A Mathematical Model for the Non-Stationary Process of Compression Molding of Plates from Granulate of Thermoplastic Composites

2017 ◽  
Vol 27 (4) ◽  
pp. 530-545
Author(s):  
V. N. Vodyakov ◽  
◽  
A. M. Kuzmin ◽  
V. V. Kuznetsov
Keyword(s):  
Mathematical Model ◽  
Stationary Process ◽  
Compression Molding ◽  
Thermoplastic Composites

High flow compression molding for recycling discontinuous long fiber thermoplastic composites

2020 ◽  
Vol 54 (23) ◽  
pp. 3343-3350
Author(s):  
Éric Léger ◽  
Benoit Landry ◽  
Gabriel LaPlante
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Compression Molding ◽  
High Flow ◽  
Low Flow ◽  
Thermoplastic Composites ◽  
Direction Parallel ◽  
Significant Difference ◽  
Long Fiber Thermoplastic ◽  
Flow Compression

An investigation into high flow compression molding for recycling thermoplastic discontinuous long fiber composites is presented. High flow recycled panels and conventional low flow baseline panels were produced with a large rectangular (2:1 aspect ratio) mold. Flow was induced in the recycled panels by stacking cut sections of conventionally produced baseline panels in the center of the mold cavity, representing 25% initial coverage. High flow compression molded panels were found to exhibit significantly higher than baseline tensile strength (+50%) and modulus (+31%) when tested in the direction parallel to flow. When tested in the direction perpendicular to flow, the opposite effect was found, with reductions in tensile strength (−42%) and modulus (−37%). However, when the average results of both directions are compared to baseline, no significant difference was found between the recycled and baseline panels. This severe anisotropic redistribution of mechanical properties suggests chip orientation is affected by flow. Additionally, micrographic analysis revealed that high flow molding induces intra-ply chip shearing and a reduction in resin rich regions within panels. Baseline panels also exhibited in-plane anisotropy, despite initial random distribution of chips and no or near no flow induced during molding. In this case, mechanical properties favored the direction perpendicular to that of the recycled panels.

Mathematical model of a non-stationary process of accumulation of gas hydrates, confined to deep-water mud volcanoes

2021 ◽  
Author(s):  
Alexey L. Sobisevich ◽  
Elena I. Suetnova ◽  
Ruslan A. Zhostkov
Keyword(s):  
Mathematical Model ◽  
Gas Hydrates ◽  
Stationary Process ◽  
Sedimentary Basins ◽  
Physical Parameters ◽  
Continental Margins ◽  
Mud Volcanoes ◽  
Environment Temperature ◽  
Hydrate Saturation ◽  
Sea Mud

<p>Large amounts of methane hydrate locked up within marine sediments are associated to mud volcanoes. We have investigated by means of mathematical modeling the unsteady process of accumulation of gas hydrates associated with the processes of mud volcanism. A mathematical model has been developed. The system of equations of the model describes the interrelated processes of filtration of gas-saturated fluid, thermal regime and pressure, and accumulation of gas hydrates in the seabed in the zone of thermobaric stability of gas hydrates. The numerical simulation of the accumulation of gas hydrates in the seabed in the deep structures of underwater mud volcanoes has been carried out using the realistic physical parameters values. The influence of the depth of the feeding reservoir and the pressure in it on the evolution of gas hydrate accumulations associated with deep-sea mud volcanoes is quantitatively analyzed. Modeling quantitatively showed that the hydrate saturation in the zones of underwater mud volcanoes is variable and its evolution depends on the geophysical properties of the bottom environment (temperature gradient, porosity, permeability, physical properties of sediments) and the depth of the mud reservoir and pressure in it. The volume of accumulated gas hydrates depends on the duration of the non-stationary process of accumulation between eruptions of a mud volcano. The rate of hydrate accumulation is tens and hundreds times the rate of hydrate accumulation in sedimentary basins of passive continental margins.</p>

Compression Molding of All-Thermoplastic Composites by Using Fiber Wastes

2007 ◽  
Vol 334-335 ◽  
pp. 81-84
Author(s):  
Tomoaki Kaneda ◽  
Teruo Kimura
Keyword(s):  
Mechanical Property ◽  
Textile Industry ◽  
Bending Strength ◽  
Compression Molding ◽  
Polyester Fiber ◽  
Thermoplastic Composites ◽  
Molding Method ◽  
Thermal Insulating ◽  
Number Of Layers ◽  
Pitch Distance

In the textile industry, recently, it is urgent to develop the recycling system of the polyester fiber waste which results from the manufacturing process of sythetic fabric. However, most of the fiber wastes are destroyed by fire or buried underground. In this paper, the insulating composites which consist of polyester fiber wastes and PLA films are molded by compression molding method. In the process of preforming, the polyester fiber wastes are arrayed in uni-direction, and PLA films are inserted among layers of the polyester fiber wastes as binder. Namely, the polyester fiber wastes layers and PLA films are laminated alternately. In this paper, pitch (distance among the fiber wastes) and number of layers of polyester fiber wastes are varied, and the effect of pitch and number of layers of polyester fiber wastes on mechanical property and thermal insulating propertiy of the composites are discussed. As the result, it is concluded here that the melted state and the thickness of layers of PLA affect largely on the thermal conductivity and the bending strength of the boards.

scholarly journals Mathematical modelling and optimization of the electroplating process with a rotating cathode to reduce the non-uniformity of the coating thickness

2019 ◽  
Vol 298 ◽  
pp. 00014
Author(s):  
Denis Solovjev ◽  
Inna Solovjeva ◽  
Viktoriya Konkina
Keyword(s):  
Mathematical Model ◽  
Mathematical Modelling ◽  
Coating Thickness ◽  
Cathode Surface ◽  
Stationary Process ◽  
Zinc Plating ◽  
Calculation Results ◽  
Electroplating Process ◽  
Theoretical Electrochemistry ◽  
Modelling And Optimization

The article is devoted to the development of an approach to improving the electroplating uniformity on the cathode surface, rotating around its axis, using a figured anode. A mathematical model of a stationary process with distributed coordinates, based on the equations of theoretical electrochemistry, has been developed for this approach. The problem for optimizing the anode shape according to the criterion for minimizing the non-uniformity of the deposited coating on the rotating cathode is formulated. The results of solving this problem are demonstrated on the example of the Zinc plating. Possible improvements to improve the accuracy of the calculation results for the developed mathematical model are given in the conclusion of the article.

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