对弹塑性材料裂纹扩展阻力曲线是惟一的，与裂纹初始长度无关。
The material resistance curve is unique and independent on crack initial lengths.
此方法仅需一个材料参数例如材料硬度或抗拉强度等即可确定材料的裂纹扩展阻力曲线。
In this method, the crack resistance curve can be determined by using only one material data, either the hardness or the tensile strength.
曲线模拟分析表明：极化方向的裂纹扩展阻力随着裂纹深度的增加而增加，体现了畴致偏转对断裂的阻碍作用。
R curve analysis indicates that resisting force of crack growth in polarization direction increases with crack size increasing, owing to ferroelectric domain deflection.
曲线模拟分析表明：极化方向的裂纹扩展阻力随着裂纹深度的增加而增加，体现了畴致偏转对断裂的阻碍作用。
R curve analysis indicates that resisting force of crack growth in polarization direction increases with crack size increasing, owing to ferroelectric domain deflection.
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