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Explain the relationship between mechanical properties of polymer such as tensile strength young's modulus elongation at break etc and their microstructure?
Young modulus, E, is the ratio between stress and strain. E=Stress/Strain. Then, more the strain value (in %) is high, more the Young Modulus has a lower value.
Vulcanization is the process which create bonds between molecule, thanks to sulphur, peroxyde etc... At the end, the material is only one molecule and can't be melted (thermoset behaviour). As a result, when stress is applied the vulcanized rubber deforms, but upon release of the stress, the article reverts to its original shape.
Thanks to this chemical process, elongation at break is improved, as tensile properties.
The macromolecules of raw rubber are linked together in vulcanized rubber by cross-linked chemical bonds, which form a vulcanisation network.
(This process is called "chemical" 'cause today a physical vulcanization is possible in order to keep a thermoplastic behaviour).
What else can I help you with?
What is physical metallurgy?
Physical metallurgy is the branch of materials science that focuses on the relationship between the structure and properties of metals and alloys. It involves studying the physical and mechanical properties of metallic materials, as well as the processes involved in their production, processing, and applications. Physical metallurgists work to understand how the microstructure of a material affects its properties and performance in various environments.
Why etchant used in microscopic examination of metal?
Etchant is used in the microscopic examination of metal to reveal the microstructure of the metal, which helps in assessing its properties and quality. By selectively corroding different phases or constituents in the metal, etchant can highlight grain boundaries, inclusions, and other features that may affect the metal's mechanical properties. This process allows for better evaluation of the metal's structure and can provide insights into factors such as material composition, heat treatment, and processing history.
Why do bigger crystal make steel tougher?
Bigger crystals in steel can enhance its toughness by providing barriers to crack propagation. When a crack encounters a large crystal, it has to change direction to continue propagating, dissipating more energy in the process. This tougher microstructure helps prevent catastrophic failures and improves the overall mechanical properties of the steel.
How can scientist deisgn alloys with specific properties?
Scientists can design alloys with specific properties by carefully selecting the combination of elements, adjusting their ratios, and controlling the microstructure of the alloy through various heat treatment processes. By understanding the relationship between the alloy's composition, processing methods, and resulting properties, scientists can tailor the alloy's characteristics to meet specific requirements for strength, hardness, ductility, or corrosion resistance, among others. Computer simulations and experimental testing play a crucial role in optimizing the alloy design process.
Is cement a mechanical mixture or a solution?
Cement is a mechanical mixture. It is composed of different materials such as limestone, clay, and gypsum that are physically mixed together but retain their individual properties.
What causes an alloy to fail an elongation test?
An alloy may fail an elongation test primarily due to its microstructure and mechanical properties, which can include factors such as brittleness, insufficient ductility, and the presence of defects or inclusions. Poor alloying elements distribution or improper heat treatment can also contribute to reduced elongation. Additionally, if the alloy has a high yield strength but low plasticity, it may fracture before exhibiting significant elongation. These characteristics ultimately determine how well the alloy can deform under tensile stress without breaking.
What has the author A M Barnes written?
A M. Barnes has written: 'Effect of composition and heat treatment on the microstructure and mechanical properties of modified 9 percent Crl percent Mo weld metals'
What is physical metallurgy?
Physical metallurgy is the branch of materials science that focuses on the relationship between the structure and properties of metals and alloys. It involves studying the physical and mechanical properties of metallic materials, as well as the processes involved in their production, processing, and applications. Physical metallurgists work to understand how the microstructure of a material affects its properties and performance in various environments.
What is the thermal and mechanical properties of polyurethane foam?
These properties depends on the type pf polyurethane; some properties are:- thermal conductivity: 0,03 W/m.K at 25 oC- tensile strength: 20-60 MPa- elongation at break; 270-800 %
When reducing the diameter of a stainless steel bar does it effect the mechanical properties?
The reduction of the diameter of a stainless steel bar by hot or cold work will usually increase the strength and lower the elongation. However after the normal annealing the mechanical properties will be about the same as before it was reduced in diameter. If the reduction is by machining, the properties will remain the same unless it is overheated.
What is the relationship between mechanical mixture and properties?
Mechanical mixture is a type of mixture where substances are physically combined without any chemical bonding. The properties of a mechanical mixture are a combination of the properties of the individual substances present in the mixture. These properties can include color, texture, density, and solubility, among others.
Relationship between a mechanical mixture and properties?
A mechanical mixture is a mixture in which the components can be separated by mechanical means. In other words, there is no chemical bonding. The parts keep their own properties and chemical make up.
Mechanical properties of EN 31 STEEL?
What are the mechanical properties of EN 8 and E N 26 steel. Whether it is advisable to use this material for seawater pump shafts
What is the effect of forging on mechanical properties of metal?
Forging significantly enhances the mechanical properties of metals by refining their microstructure, which leads to improved strength, toughness, and ductility. The process aligns the grain structure in the direction of the applied stress, resulting in increased resistance to fatigue and failure. Additionally, forging can eliminate defects and inclusions, further contributing to the overall integrity and performance of the material. As a result, forged metals often exhibit superior mechanical characteristics compared to their cast or machined counterparts.
What has the author D Shechtman written?
D. Shechtman has written: 'Microstructure and properties of rapidly solidified alloys' -- subject(s): Aluminum alloys, Powder metallurgy, Thermal properties
What has the author Dawei Hu written?
Dawei Hu has written: 'The processing, microstructure and properties of Ti6A14V-TiC metal-matrix composites'
Why etchant used in microscopic examination of metal?
Etchant is used in the microscopic examination of metal to reveal the microstructure of the metal, which helps in assessing its properties and quality. By selectively corroding different phases or constituents in the metal, etchant can highlight grain boundaries, inclusions, and other features that may affect the metal's mechanical properties. This process allows for better evaluation of the metal's structure and can provide insights into factors such as material composition, heat treatment, and processing history.
