The heat treatment production institutions of 2a70 aluminium alloy pre-stretching plate are determined.

确定了2a70铝合金预拉伸厚板的热处理工艺参数。

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With FEA based quenched stress, different stress distributions were obtained under different conditions of pre-stretching.

在获得淬火残余应力的基础上，模拟了不同预拉伸量对毛坯的淬火残余应力的消除。

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To eliminate the residual stress of aluminum alloy pre-stretching board, an elastic-plastic finite element model was developed to simulate the vibratory stress relief (VSR) process.

为消除铝合金预拉伸板中的残余应力，采用弹塑性有限元法对振动时效消除残余应力进行数值模拟。

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Apart from competition from the well-established A-level, the new qualification could also be rivalled by another proposed exam, called the Pre-U, aimed at stretching pupils planning to enter higher education.

BBC: Heads demand answers on Diplomas