Autofrettage is a process used in engineering to increase the strength and fatigue life of pressure vessels. It involves the application of a high internal pressure to the vessel, which causes the material to yield and deform plastically. This deformation creates compressive stresses on the inner surface of the vessel, which increase its resistance to further deformation and failure.
Definitions
Autofrettage can be defined as a process of applying internal pressure to a tube or cylinder to induce plastic deformation and create compressive residual stresses in the material. This process is used to increase the strength and fatigue life of pressure vessels.
Origin
The term autofrettage comes from the French word “frettage,” which means to fret or rub. The process was first developed in the early 20th century by French engineer Henri Fayol, who used it to increase the strength of artillery shells.
Meaning in different dictionaries
According to the Oxford English Dictionary, autofrettage is “a process of applying internal pressure to a tube or cylinder to induce plastic deformation and create compressive residual stresses in the material, used to increase its strength and fatigue life.”
The Merriam-Webster Dictionary defines autofrettage as “a process for improving the fatigue life of a pressure vessel by subjecting it to internal pressure sufficient to cause plastic deformation and create compressive residual stresses in the material.”
Associations
Autofrettage is commonly associated with the manufacturing of high-pressure vessels, such as those used in the oil and gas industry, aerospace engineering, and military applications. It is also used in the production of hydraulic cylinders, gun barrels, and other components that are subjected to high internal pressures.
Synonyms
Some synonyms for autofrettage include pressure pre-stressing, internal pressure forming, and pressure aging. These terms all refer to the process of inducing plastic deformation and creating compressive residual stresses in a material to increase its strength and fatigue life.
Antonyms
There are no direct antonyms for autofrettage, as it is a unique process that does not have a direct opposite. However, some processes that are used to weaken or reduce the strength of materials include annealing, quenching, and tempering.
The same root words
The root words of autofrettage are “auto-” and “frettage.” Auto- means self or automatic, while frettage means to fret or rub. These words combine to create the meaning of autofrettage, which is the self-induced plastic deformation and creation of compressive residual stresses in a material.
Example Sentences
- The pressure vessel was subjected to autofrettage to increase its strength and fatigue life.
- The hydraulic cylinder was manufactured using the autofrettage process to ensure its durability and reliability.
- The gun barrel underwent autofrettage to improve its resistance to deformation and failure under high internal pressures.
- The aerospace components were designed with autofrettage in mind to ensure their ability to withstand the extreme conditions of space travel.