细观解理断裂应力主要由临界裂纹的长度决定。
The local cleavage fracture stress is mainly determined by the length of the critical microcrack.
根据试验结果，得到了花岗岩亚临界裂纹扩展速度与应力强度因子之间的关系和花岗岩的断裂韧度。
Based on testing results, the relationship between velocity of granite subcritical crack growth and stress intensity factor, and the fracture toughness are obtained respectively.
本文通过裂隙亚临界扩展的分析，提出一个计算低、中等应力率下裂隙断裂起动应力的新公式。
In this paper, through analyzing the subcritical crack growth, a new formula is presented which can be used to calculate the crack fracture initiation stress at low and middle stress rates.
同时玻璃表面存在大量微裂纹，当热应力达到临界值时，在热应力的作用下产生脆性断裂。
Since the surface of glass have many micro-crack, when the thermal stress reach the critical value, thermal breakage occur.
当裂尖出现纤维裂纹后，韧脆转变机理是：由二相粒子决定的解理断裂应力转变成由晶粒尺寸决定的解理断裂应力。同缺口试样具有相同的临界事件。
The mechanism of ductile-brittle transition was considered as the result of the transition of stress as determined by the second phase particle to that as determined by the ferrite grain.
平面应变断裂韧性(KIc)：平面应变条件下应力强度因子的临界值(即达到该值时裂纹发生扩展)。
Plane strain fracture toughness (KIc). The critical value of the stress intensity factor (i. e., at which crack propagation occurs) for the condition of plane strain.
根据试验结果，得到了花岗岩亚临界裂纹扩展速度与应力强度因子之间的关系和花岗岩的断裂韧度。
Based on testing results, the relationship between velocity of granite subcritical crack growth and stress intensity factor, and the fracture toughness are obtained respectively. Du...
断裂韧度(Kc)：发生裂纹扩展时应力强度因子的临界值。
Fracture toughness (Kc). Critical value of the stress intensity factor for which crack extension occurs.
断裂韧度(Kc)：发生裂纹扩展时应力强度因子的临界值。
Fracture toughness (Kc). Critical value of the stress intensity factor for which crack extension occurs.
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