Прочитайте текст и ответьте на вопрос: Why were originally industrial robots designed Industrial rob...: ответ на тест 1046597 - Английский язык

Industrial robots, originally designed only to perform simple tasks in environments dangerous to human workers, are now widely used to transfer, manipulate, and position both light and heavy workpieces performing all functions of a transfer machine.
In the 1920s the automobile industry for the first time used an integrated system of production. This method of production was adopted by most car manufacturers and became known as Detroit automation.
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Why were originally industrial robots designed?

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Why were originally industrial robots designed?
Industrial robots, originally designed only to perform simple tasks in environments dangerous to human workers, are now widely used to transfer, manipulate, and position both light and heavy workpieces performing all functions of a transfer machine.
In the 1920s the automobile industry for the first time used an integrated system of production. This method of production was adopted by most car manufacturers and became known as Detroit automation.

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What is fatigue?
Fatigue is the growth of cracks under stress. It occurs when a mechanical part is subjected to a repeated or cyclic stress such as vibration. Even when the maximum stress never exceeds the elastic limit, failure of the material can occur even after a short time. No deformation is seen during fatigue, but small localized cracks develop and propagate through the material until the remaining cross-sectional area cannot support the maximum stress of the cyclic force. Knowledge of tensile stress, elastic limits, and the resistance of materials to creep and fatigue are of basic importance in engineering.

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Ductility is the ability of a material to deform without breaking. One of the great advantages of metals is their ability to be formed into the shape that is needed, such as car body parts. Materials that are not ductile are brittle. Ductile materials can absorb energy by deformation but brittle materials cannot.

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Hardening of plain carbon steel consists of two stages; first heating to a specific temperature and then cooling rapidly. The cooling process is known as quenching. The correct temperature to which steel must be heated varies with its carbon content.
Overheating can cause grain growth, resulting in weak components.

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Sheet metal forming is widely used when parts of certain shape and size are needed. 1_______. One characteristic of sheet metal forming is that the thickness of the sheet changes little in processing. The metal is stretched just beyond its yield point (2 to 4 percent strain) in order to retain the new shape. 2_______. Shearing is a cutting operation similar to that used for cloth.
3_______. For example, to make the roof of an automobile from a flat sheet, the edges are gripped and the piece pulled in tension over a lower die. 4_______. And finally the edges are sheared off to give the final dimensions.