What are the characteristics of composite materials?
Composites are a mixture. Has played a large role in many areas, replacing many traditional materials. Composite materials are divided into metal and metal composite materials, non-metal and metal composite materials, non-metal and non-metal composite materials according to their composition. The following small series for everyone to introduce what is the characteristics of composite materials and composite materials.
What is composite material
Composite materials are a kind of material that is both old and advanced, familiar and unfamiliar to us. As the name implies, composite material is a material composed of two or more materials with different chemical and physical properties. A simple example: As early as a thousand years ago, our ancestors learned to use adobe and dry plants (such as straw) to make adobe (also known as adobe). Another type of composite material that we are familiar with is a natural composite material. For example, bones, hearts, and shells of humans or animals, as well as rods, branches and leaves of various plants can be said to be both old and advanced natural composite materials. example. Almost all the natural plants and organisms are the best examples of composite materials. Natural composite materials only emerged after hundreds of millions of years of evolution. Therefore, composite materials are both old and advanced materials. In spite of this, the history of modern artificial composite materials starting with polymer-based composite materials is not long, which is closely related to the development of modern industry and scientific culture. In particular, the development of polymer-based composites is inseparable from the development of plastics and various man-made fibers.
Composite material characteristics
1. High specific strength and specific modulus. The outstanding advantages of composite materials are their higher specific strength and specific modulus. For example, the specific modulus of carbon fiber reinforced resin composites is five times higher than that of steel and aluminum alloys, and the specific strength is more than three times higher than steel and aluminum alloys.
2, high fatigue resistance. Fiber composites, especially resin-based composites, are less sensitive to notches and stress concentrations, and the interfaces between the fibers and the matrix can make the propagating tips blunt or change direction, which prevents the rapid propagation of cracks, and therefore the fatigue strength is poor. The fatigue limit of carbon fiber unsaturated polyester resin composites can reach 70%~80% of the tensile strength, while the metal materials only have 40%~50%.
3, strong resistance to fracture. There are a large number of independent fibers in fiber composites, typically several tens to several tens of thousands per square centimeter, which are combined into a whole by a flexible matrix, when a few fibers break due to overload or other reasons. The load will be redistributed to other unbroken fibers so that the components do not fail suddenly in a short period of time. Therefore, composite materials have relatively high fracture toughness.
4, good vibration damping performance. The natural vibration frequency of the structure is related to the quality and shape of the structure itself and is proportional to the square root of the specific modulus of the material. If the natural vibration frequency of the material is high, it can avoid resonance in the working state and the early damage caused by it.
5, high temperature performance, strong resistance to creep. Since fiber materials can maintain high strength at high temperatures, fiber-reinforced composite materials, such as carbon fiber-reinforced resin composites, have significantly higher heat resistance than resin matrices. The metal matrix composites show superiority in terms of heat resistance. For example, the strength of aluminum alloy decreases rapidly with increasing temperature, while the use of quartz glass to strengthen aluminum matrix composites can maintain room temperature strength at 500°C. 40%. Silicon carbide fiber, alumina fiber and ceramic composite, can withstand high temperatures in the air 1200 ~ 1400 °C, higher than the heat resistance of all super crucible temperature alloy above 100 °C.
6, good corrosion resistance. Many kinds of composite materials can resist acid and alkali corrosion, such as glass fiber reinforced phenolic resin composite materials, can be used for a long time in acidic media containing chloride ions, and can be used to manufacture chemical pipelines, pumps, which are resistant to strong acids, salts, esters, and certain solvents. Valves, containers, mixers and other equipment.
7, more excellent anti-friction, wear resistance, self-lubricating and corrosion resistance. Because the composite material component has a simple manufacturing process and exhibits good process performance, it is suitable for integral molding. In the manufacture of composite materials, parts are also obtained, which reduces the number of parts, fasteners and joints, and saves raw materials and man-hours.
Classification of composite materials
1, fiber-reinforced composite materials. The use of a wide range of basic life will be used.
2. Sandwich-type composite materials. There are different material compositions, layered materials.
3, fine-grained composite materials. Ceramics that can be used for alloys and metals are a hard hybrid material.
4, hybrid composite materials. This kind of composite material is usually a mixture of many kinds of materials. The star pair is complicated, but it can increase the hardness and strength of the material. It is a very hard material.
5. The structural conforming material is a good bearing material. It is generally used in large buildings and has a very good bearing capacity. It can reduce the occurrence of accidents and promote the development of urbanization. Commonly used in glass and metal and the like.
Editor's summary: The features of composites and composites are introduced here and we hope to be helpful to everyone. If you want to know more related information, you can pay attention to this website information.
At JUHENG Plant we have a selection of KOBELCO Excavator final drives and parts available. This includes final drives for many models.
KOBELCO Excavators are used within many different industries and ensuring they are running smoothly, JUHENG plant can quickly supply KOBELCO Parts to ensure essential fixes & maintenance can be carried out on your machines quickly. You may also be looking for IHI Spare parts, to ensure you`re able to keep your machines running efficiently.
If you would like to find out more information about any of our available parts then please feel free to get in touch with us.
Hydraulic Piston Pump, Duplex Pump, Short-Stroke Pump, Noise/Vibration Reduction, High Self-Priming Ability, Rotational Stability, High Efficiency, High Pressure, Compact Size, Reduction of Overall Length.
KOBELCO hydraulic pumps for the machine models listed below are available ex stock or with a short delivery.
We export GENUINE PUMP, OEM PUMP, AFTERMARKET PUMP. We are specialized in OEM PUMP & AFTERMARKET PUMP. We export 95 NATIONS. Please contact us If you need STABLE SUPPLIER.
KOBELCO Hydraulic Main Pump,KOBELCO Main Hydraulic Pump,KOBELCO Hydraulic Pump,KOBELCO Hydraulic Pump Spare Parts,KOBELCO Hydraulic Main Pump Assembly,KOBELCO Main Pump,KOBELCO Pump,KOBELCO Hydraulic Parts,KOBELCO Excavator Parts
Jining Juheng Hydraulic Machinery Co., Ltd. , https://www.sdjuhengmachine.com