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遵循连续体力学法的原则，直接从拉伸样品的应力张量（应力偏张量）入手计算了铁单晶常见取向的ｒ值．计算结果与实际相符．
Following the principle of continuous body mechanics, the r value of common orientation of iron single crystal was calculated directly from the stress tensor (stress partial tensor) of the tensile specimen. The calculation result is in accordance with the actual situation.