The rock damage model and the damage-coupling model suited to analyze the whole process of water jet breaking rock were established with continuum damage mechanics and micro damage mechanics.
运用连续损伤力学和细观损伤力学理论，建立了适用于水射流破岩全过程分析的岩石损伤模型以及宏细观损伤的耦合模式。
Basing upon the kinematic features of a planetary drill the paper deals with its specificity of rock breaking. The process and basic laws of rock breaking are presented.
根据行星钻头的运动特征，本文分析了行星钻头破岩的特点及其工作面的破坏方式，揭示了行星钻头破岩的基本规律。
The bit needs not only the high rock-breaking capacity but also the strong wear and low resistance during rock-breaking process.
而钻头在破岩过程中，既要求具有高效的破岩能力，又要求具有强耐磨性和低阻力。
The structure of tri-cone rock bit is complicated. As the cutting structure touch the stratum directly, it affects the process of breaking rock and the performance of tri-cone rock bit.
三牙轮钻头结构复杂，其中齿面结构直接与地层接触，对于岩石破碎过程和钻头工作性能的影响最大。
The structure of tri-cone rock bit is complicated. As the cutting structure touch the stratum directly, it affects the process of breaking rock and the performance of tri-cone rock bit.
三牙轮钻头结构复杂，其中齿面结构直接与地层接触，对于岩石破碎过程和钻头工作性能的影响最大。
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