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已知: 承受轴向拉伸的橡皮带,当横截面上应力 σ =10MPa 时,其纵向正应变为 0.5 ,然后保持应变不变, 50 天后应力减小为 5MPa 。

作业解析 1. 已知: 承受轴向拉伸的橡皮带,当横截面上应力 σ =10MPa 时,其纵向正应变为 0.5 ,然后保持应变不变, 50 天后应力减小为 5MPa 。. 试: 计算若保持同样应变,再经过 50 天后应力减少到什么数值。. 解: 这是应力松弛问题,采用用麦克斯韦模型方程. 因为应变保持不变,所以有. 求得. 积分,由 t = 0 时,. 作业解析 1. 解: 这是应力松弛问题,采用用麦克斯韦模型方程. 因为应变保持不变,所以有. 作业解析 1. 由已知条件,当 t =50 (天)时,应力由 10MPa 下降至 5MPa 。. 于是. 据此,得到.

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已知: 承受轴向拉伸的橡皮带,当横截面上应力 σ =10MPa 时,其纵向正应变为 0.5 ,然后保持应变不变, 50 天后应力减小为 5MPa 。

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  1. 作业解析1 已知:承受轴向拉伸的橡皮带,当横截面上应力σ=10MPa时,其纵向正应变为0.5,然后保持应变不变,50天后应力减小为5MPa。 试:计算若保持同样应变,再经过50天后应力减少到什么数值。 解:这是应力松弛问题,采用用麦克斯韦模型方程 因为应变保持不变,所以有

  2. 求得 积分,由t = 0时, 作业解析1 解:这是应力松弛问题,采用用麦克斯韦模型方程 因为应变保持不变,所以有

  3. 作业解析1 由已知条件,当t=50(天)时,应力由10MPa下降至5MPa。 于是 据此,得到 应力以Mpa为单位,t以天为单位

  4. 作业解析1 应力以Mpa为单位,t以天为单位。 于是可以求得t=100天时的应力值: 再经过50天(一共经过100天),应力减小到2.5MPa.

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