A  bar  of mild  steel is  stressed  to  the  point  where  general  yielding  occurs  and  the  test is interrupted  prior  to  necking. Draw  the  stress-strain  curve  and describe  the  stress-strain response phenomenologically  and  in  terms  of  dislocation  dynamics.Suppose  the  test  bar  is immediately  reloaded into  the  plastic  strain  range;describe  the  new  stress-strain  response. Explain in detail any different response in terms of dislocation dynamics.

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