Precision estimation of principal direction is more objective by using principal stress deflection error proposed in this paper.

提出了主应力的偏角误差概念及其计算方法，使主应力方向的精度评定更加真实客观。

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The correction-functions for the light deflection error of bar diameter measurement in several different directions are obtained.

建立了沿不同方向测量圆钢直径时、光线偏折误差的修正函数。

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The result indicated that, the section upper and lower reason stress error is about 5% while stepping, the deflection error, about 1%.

计算结果表明：跨中截面上下缘应力计算值与试验值误差在5%左右，跨中挠度误差在1%左右。

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The result indicated that, the section upper and lower reason stress error is about 5% while stepping, the deflection error, about 1%.

计算结果表明：跨中截面上下缘应力计算值与试验值误差在5%左右，跨中挠度误差在1%左右。

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