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Difference between elastic and plastic deformation?
Elastic deformation returns to it's original shape after a strain is applied. Plastic deformation returns to a deformed shape after a strain is applied. The material's molecular bonds are strained to the point of fracture, making it not possible to return to the same state. Elastic deformation will return to its original shape. Plastic deformation is when you alter the original form. To understand more on this subject you might investigate failure analysis literature. Lots of good stuff there ratchet marks, beach marks, reverse bending etc... I believe the U.S. metallurgical society has the best reference material on this subject. A temporary shape change that is self-reversing after the force is removed, so that the object returns to its original shape, is called elastic deformation. In other words, elastic deformation is a change in shape of a material at low stress that is recoverable after the stress is removed. Examples would be the loading of a bridge or building support beam where the loads remain within the original design parameters, or the use of a safety pin where when it is opened it returns to it's unloaded shape. When the stress is sufficient to permanently deform the metal, it is called plastic deformation. Examples would be the building support beams for the twin towers, where the heat generated by the fires decreased the strength of the steel and allowed it to deform plastically, or the loads that are applied to a section of electrical conduit or mechanical piping in order to bend them into a specific shape. in elastic def. , the material returns to its original shape once force is removed. in plastic, the deformation is permanent and the material doesn't return to its original shape the elastic deformation happens in yield point and elastic deformation back to original size but plastic deformation will not back tto original size.
What is the Significance of recrystallization temperature in metalworking?
Recrystallization temperature in metal working can be defined as the temperature at which the plastic deformation takes place perfectly. The stresses induced during the process is are grater than the yield strength and less than the fracture strength.
How are hardness and tensile strength related?
There are tables that give you the Tensile Strength based on a Rockwell Hardness test of a specimen of metal. For example: Rc of 54 is a Steel of TSU = 300,000 psi. Google the internet for Rockwell Hardness Table.
What metal is used to make impeller?
Different kinds of metal can be used in making a propeller. Marine propellers are made from aluminum and stainless steel since they are corrosion resistant.
How it is defined the minimum design metal temperature?
MDMT usually is used for decision of metal thickness. this is the most important to design such as a drum , tank, etc.. in plant business.
Definition Hot working metal?
Plastic deformation of metals above the recrystallization temperature.
What happpens when force is applied to a metal?
When force is applied to a metal, it can undergo deformation, which may be elastic or plastic. In elastic deformation, the metal returns to its original shape once the force is removed, while in plastic deformation, the metal permanently changes shape. If the applied force exceeds the metal's yield strength, it may lead to fracture or failure. The behavior of the metal under force is influenced by factors such as its composition, temperature, and the rate of loading.
What are the properties of cermets?
Cermet is ideally designed to have the optimal properties of both a ceramic and metallic materials. Ceramics are composed of high temperature resistance and hardness, and metal has the ability to undergo plastic deformation. Dependant on the physical structure of the material, cermets can also be metal matrix composites, but cermets are usually less than 20% metal by volume.
Why are the metal deformation processes important commercially and technologically?
Efficient mass production of materials.
Why do you use metal for sauce pans?
Metal is a good conductor of heat. Metal is also much more durable for cooking in comparison to wood or plastic, which would burn or melt. And ceramics are too fragile.
What is cold forming?
Cold forming refers to the strengthening of metal through plastic deformation. It is also known as strain hardening or cold working.
Is Ceramic metal or non metal?
Ceramics are nonmetallic.
What happens when force is applied to a metal what property does this demonstrate?
When force is applied to a metal, it deforms and changes shape. This demonstrates the property of ductility, which is the ability of a material to undergo plastic deformation without breaking.
What is internal plastic flow?
Internal plastic flow refers to the deformation of a material without fractures or cracks occurring. It typically happens in ductile materials under high stress and temperature conditions, causing the material to permanently change shape without breaking. This process is commonly observed in metal forming and forging operations.
Why is a metal ruler stronger than a plastic ruler by terms of the kinetic theory?
A metal ruler is stronger than a plastic ruler in terms of the kinetic theory because the metal atoms are arranged in a tightly packed, orderly structure which gives it greater strength and cohesion. The metal ruler's atomic structure allows it to better withstand external forces and deformation compared to the more loosely arranged atoms in a plastic ruler.
What is a ductile metal?
A ductile metal is a metal that experiences noticeable deformation under tensile loading.
What happens at the atomic level when a metal is subjected to pressure such as a blow from a hammer?
When a metal is subjected to pressure, the atoms in the metal get closer together, causing the bonds between them to deform. This deformation results in a change in the arrangement of atoms, leading to a rearrangement of the crystal lattice structure. If the pressure is high enough, the metal can undergo plastic deformation and change shape.
