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【简答题】
有一钢试样,其直径为10mm,标距长度为50mm,当载荷达到18840N时,试样产生屈服现象。载荷加到36110N时,试样发生缩颈现象,然后被拉断,拉断后标距长度为63mm,断裂处直径为6.7mm,则试样的σ s = MPa;σ b = MPa;δ= ;Ψ= 。
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