<正> 7. Metal working at high speeds Metals are often worked plastically at high speeds. For example,in fast wire drawing the metal may he pulled through at about 30m s~(-1), giving strain rates in the die of order 10~3 to 10~4s~(-1).In explosive forming even higher rates are rached, e.g. 10~5 s~(-1). Under such conditions metals generally behave in a manner different from that under static loading conditions. They follow a different stress- strain curve. The Plastic strain may become intensely localized in certain re-
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