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对K2O-MgO－AlO3-B2O3-SiO2-F多元系统的可切削微晶玻璃的疲劳行为进行了研究。结果表明：材料在静载荷、动载荷、循环载荷作用下的应力腐蚀指数n分别为69.54、35．2、18.18。应力腐蚀指数n的大小强烈依赖于加载方式，并能作为材料抵抗裂纹扩展的某种抗力指标，循环载荷和动载荷对材料造成了附加损伤，致使在相同应力水平下材料寿命明显下降。
The fatigue behavior of machinable glass-ceramic with K2O-MgO-AlO3-B2O3-SiO2-F system was studied. The results show that the stress corrosion indexes n of materials under static load, dynamic load and cyclic load are 69.54, 35.2 and 18.18 respectively. The size of stress corrosion index n strongly depends on the loading method and can be used as a kind of resistance index to resist the crack propagation. Cyclic loading and dynamic loading add additional damage to the material, resulting in a significant decrease of material life at the same stress level.