scholarly journals The influence of accelerated aging on the physical and chemical properties of a composite material: a systematic overview

2021 ◽  
Vol 19 (4) ◽  
pp. 310-316
Author(s):  
S. M. Abdulkerimova ◽  
A. A. Kulikova ◽  
M. Yu. Dashtieva
Keyword(s):  
Composite Material ◽  
Composite Materials ◽  
Artificial Aging ◽  
Chemical Properties ◽  
Accelerated Aging ◽  
Scientific Data ◽  
Dental Composite ◽  
Morphological Properties ◽  
Clinical Conditions

Relevance. Today, dental composite materials are very popular among dentists. The composite material is a filler in the form of particles of various sizes immersed in a polymer matrix. Polymer composites are used for direct filling of all groups of teeth and at different depths of the lesion. Composite materials have optimum mechanical, aesthetic and functional properties. They are simple and easy to use, provide long-term restoration service, and also have a wide price range. All these qualities allowed composite materials to firmly gain a foothold in the practice of dentists around the world. In this regard, clinicians and researchers are constantly trying to significantly improve their physical, mechanical, adaptive and aesthetic properties.Aim. Conduct a systematic assessment of the available scientific data on the effect of accelerated aging of the composite on its physicochemical properties.Materials and methods. In the course of a systematic review of the literature, a study was made of publications in electronic databases such as Google Scholar, PubMed, Research gate, Elibrary. The search results are formatted using the Prisma diagram.Results. Dental composites inevitably age over time and under the influence of environmental factors. To predict the long-term service life of composite restorations, scientists and clinicians are studying the aging behavior of the material. To simulate the clinical conditions of the oral cavity, various methods of artificial aging of dental composite materials have been developed.Conclusions. A study of scientific papers published over the past 10 years on the topic of artificial aging of dental composite materials has shown its unambiguous effect on the mechanical and morphological properties of polymers. The use of methods for simulating clinical conditions made it possible to reduce the study time and analyze the changes obtained.

scholarly journals Wheeled Robot Dedicated to the Evaluation of the Technical Condition of Large-Dimension Engineering Structures

Robotics ◽  
2020 ◽  
Vol 9 (2) ◽  
pp. 28
Author(s):  
Jarosław Domin ◽  
Marcin Górski ◽  
Ryszard Białecki ◽  
Jakub Zając ◽  
Krzysztof Grzyb ◽  
...  
Keyword(s):  
Composite Material ◽  
Composite Materials ◽  
Technical Condition ◽  
Fiber Reinforced Polymer ◽  
Loading Capacity ◽  
Engineering Structures ◽  
Reinforced Polymer ◽  
Wheeled Robot

There are many reasons why engineering structures are at risk of losing their loading capacity during their long-term exploitation, which may lead to hazardous states. In such cases, structures must be strengthened. The most popular technique of strengthening is based on the use of composite materials—fiber-reinforced polymer (FRP) elements attached to the structure with the special resins. FRP elements are applied externally, often in hard to reach places, which makes it difficult to diagnose the durability and quality of such a connection. In this study, a combination of a modern thermographic method was proposed, which makes it possible to assess the degree of damage to the contact of the structure with the composite material along with the running platform (wheeled robot) equipped with a set of diagnostic sensors. The development potential of such a solution for subsequent projects was also indicated.

Long-term release of monomers from modern dental-composite materials

2009 ◽  
Vol 117 (1) ◽  
pp. 68-75 ◽  
Author(s):  
Olga Polydorou ◽  
Armin König ◽  
Elmar Hellwig ◽  
Klaus Kümmerer
Keyword(s):  
Composite Materials ◽  
Dental Composite

Superdeep Penetration - Novel Method of Nanoreinforced Composites Producing Based on Metallic, Ceramic and Polymer Matrixes

2009 ◽  
Vol 79-82 ◽  
pp. 1975-1978
Author(s):  
Oleg Figovsky ◽  
Sergey Usherenko
Keyword(s):  
Composite Material ◽  
Composite Materials ◽  
Chemical Properties ◽  
Second Stage ◽  
Superdeep Penetration ◽  
Third Stage ◽  
Novel Method ◽  
Two Stages ◽  
Physical And Chemical ◽  
And Chemical Properties

Now there is a motivation for creation of the materials possessing a considerable difference of physical and chemical properties in volume of composite materials 1 . Composite materials allow realizing a complex of various properties which cannot be realized simultaneously in mono material. The perspective in reception of a new smart nanomaterial is basically defined by possibilities which create processing conditions Choosing and manufacturing of fibers refers to the second stage of composite material reinforcement. Process of assemblage of a composite material from the details made at first two stages of process refers to the third stage. But at each stage of process of manufacturing of a composite material there are specific problems. The basic problem at composite material creation, as a rule, is essential contradictions between engineering solutions for various stages of process.

The Collapse Characteristics of CFRP Hat-Shaped Sectional Members under Moisture Absorptions Having the Temperature Change

2013 ◽  
Vol 535-536 ◽  
pp. 426-429
Author(s):  
Yong Jun Yang ◽  
In Young Yang ◽  
Ju Ho Choi
Keyword(s):  
Composite Material ◽  
Composite Materials ◽  
Moisture Absorption ◽  
Chemical Properties ◽  
High Strength ◽  
Steel Plates ◽  
Extreme Condition ◽  
Design Data ◽  
Collapse Characteristics ◽  
Cfrp Composite

CFRP composite with light weight, high strength, and high elasticity compared to metal is widely used rather than previous steel plates. However, CFRP composite material has the weakness in hygrothermal and impact collapsed environment. Especially, moisture absorption into composite material under hygrothermal environment can change molecule arrangement and chemical properties. Therefore, the purpose of this study lies in acquiring quantitative design data that can be put into the practice by comparing and evaluating the strength degradation under the environment where the moisture is absorbed by conducting static and impact collapse test after setting extreme condition for CFRP composite that takes consistent form such as frontal side members that is actually used in vehicle. This study compared and studied change in the progress of a moisture absorption ratio after setting up the temperature of 60 degrees, and 80 degrees in order to comprehend how the change in the temperature impacts on moisture absorption status inside CFRP composite materials. As a result of this study showed that the strength reduction of about 50% appears due to moisture absorptions. In addition, it showed that the higher the temperature is, the more rapid the progress of a moisture absorption inside CFRP composite materials is. Accordingly, it showed that the change in matrix also has a weak point.

Properties of Materials from Activated Fly Ash from Fluidized Burning

2014 ◽  
Vol 1000 ◽  
pp. 338-341
Author(s):  
Jaromír Poláček ◽  
Rostislav Šulc
Keyword(s):  
Fly Ash ◽  
Chemical Properties ◽  
Accelerated Aging ◽  
Long Term Stability ◽  
Mechanical And Physical Properties ◽  
Properties Of Materials ◽  
Physical And Chemical ◽  
Alkali Activated

This article deals with the basic properties of materials based on alkali-activated fly ash which contains a portion of fly ash produced during fluid burning. The primary task of our research was characterization of physical and chemical properties of each type of fly ash and fly ash mixture. The new materials composed of fly ash mixture and fly ash may have the similar mechanical and physical properties. The work focused on findingan appropriate technological procedure, the optimum composition of mixtures. Long-term stability was simulated by means of accelerated aging of these materials.

scholarly journals Unknown Qualities

2013 ◽  
Vol 135 (08) ◽  
pp. 44-49
Author(s):  
Jean Thilmany
Keyword(s):  
Composite Material ◽  
Composite Materials ◽  
Rocket Engine ◽  
Weight Ratio ◽  
Software System ◽  
Material Models ◽  
Software Packages

This article reviews various tools that are evolving to help engineers work with complex composite materials. Specialized composite analysts are needed to help find the best material for a particular use and to determine if it can be manufactured with the chosen material and in a particular shape. The Falcon Heavy spaceflight system is planned to launch on a SpaceX-designed rocket engine. As composite materials are lighter than metal, SpaceX engineers realized that composites could improve the strength-to-weight ratio of its materials. In order to help engineers choose the best composite for the design, the software system contains a large library of material models that designers can use to explore a composite material and determine how it might behave under a variety of circumstances. Predicting how the cracks will affect the part long-term still cannot be done within software packages and must be prototyped.

Study on Al2O3 Coated Carbon Sulfur Composite Materials for Lithium-Ion Battery

2013 ◽  
Vol 860-863 ◽  
pp. 952-955
Author(s):  
Xing Hua Liang ◽  
Chao Chao Ye ◽  
Yu Si Liu ◽  
Tian Jiao Liu ◽  
Lin Shi
Keyword(s):  
Composite Material ◽  
Composite Materials ◽  
Retention Rate ◽  
Chemical Properties ◽  
Lithium Ion ◽  
Cycle Performance ◽  
Impregnation Method ◽  
Physical And Chemical ◽  
Coated Carbon ◽  
And Chemical Properties

Coated Al2O3thin film on the surface of the carbon sulfur composite material by liquid phase impregnation method, then made physical and chemical properties and electrochemical performance analysis on the coated carbon sulfur composite materials.Al2O3reduce the direct contact of the carbon sulfur composite materials and electrolyte, reducing the erosion of electrolyte on cathode materials, improve the cycle performance of carbon sulfur composite material. 0.1C in the 2.1~3.2v cycle 20 to 100 times. The capacity retention rate increased from 70% to 90% after coating.

scholarly journals Effect of complex flame retardant on physico-chemical properties of orthophthalic unsaturated resin

2020 ◽  
pp. 26-29
Author(s):  
Y. M. Yevtushenko ◽  
Y. A. Grigoriev ◽  
I. O. Kuchkina ◽  
E. V. Afoshina ◽  
G. A. Krushevsky
Keyword(s):  
Mechanical Properties ◽  
Composite Material ◽  
Composite Materials ◽  
Flame Retardant ◽  
Unsaturated Polyester ◽  
Chemical Properties ◽  
Physical And Mechanical Properties ◽  
Polyester Resins ◽  
Physico Chemical ◽  
Kinetics Of

A brief review of the results of studies on reducing the combustibility of composite materials based on unsaturated polyester resins is presented. A flame retardant orthophthalic unsaturated resin based on a complex flame retardant was developed and studied. It is shown that the category for resistance to burning of the resin is achieved with 15–20% filling of the complex flame retardant based on ammonium polyphosphate, melamine and pentaerythritol. The kinetics of curing and physical and mechanical properties of the composite material are evaluated.

Properties of Materials from Activated Fly Ash from Fluidized Burning

2014 ◽  
Vol 1054 ◽  
pp. 173-176 ◽  
Author(s):  
Jaromir Polacek ◽  
Rostislav Šulc
Keyword(s):  
Fly Ash ◽  
Chemical Properties ◽  
Accelerated Aging ◽  
Long Term Stability ◽  
Mechanical And Physical Properties ◽  
Properties Of Materials ◽  
Physical And Chemical ◽  
Alkali Activated ◽  
And Chemical Properties

This paper describes basic properties of materials composed of fly ash produced during fluid burning. This material is based on alkali-activated fly ash which contains a portion of fly ash produced during fluid burning. Firstly the physical and chemical properties was described for each type of fly ash and fly ash mixture. The new materials composed of fly ash mixture and fly ash may have the similar mechanical and physical properties. The work focused on findingan appropriate technological procedure, the optimum composition of mixtures. Long-term stability was simulated by means of accelerated aging of these materials.

Prediction of Long-Term Creep Behavior of High Performance Composite Material for Spacecraft

2016 ◽  
Vol 689 ◽  
pp. 93-97
Author(s):  
Kyung Ju Min ◽  
Ji Ung Choi ◽  
Ho Sung Lee
Keyword(s):  
Composite Material ◽  
Composite Materials ◽  
Creep Behavior ◽  
High Performance ◽  
Temperature Shift ◽  
Analysis Data ◽  
Space Environment ◽  
High Performance Composite ◽  
Term Creep

Even though carbon/epoxy composite materials have been widely used in aircraft for many years, different requirements are often required for composite materials in spacecraft application due to the space environment. Some of the considerations include modulus and thermal properties for spacecraft while as strength is important for aircraft. For heat pipe panels, space radiator, antennas or optical benches, thermal stability is required for the life of the satellite. In this study, long term creep behavior of high performance composite material is investigated with time-temperature shift factor. The fiber is pitch-based carbon which shows high thermal conductivity and high modulus. It was possible to predict creep compliance after 5 years from dynamic mechanical analysis data. This information is useful to understand the property change during the intended service life of the spacecraft.

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