...键词: Ilizarov 张力-应力法则 外固定器 马蹄内翻足 矫形手术[gap=3052]key words：ilizarov; principle of tension-stress; external fixator; talipes equinovarus; orthopedic operation ..
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Massage instrument that introduces the principle of the heat treatment to lessen stress, relieve fatigue, ease tension and relax muscles.
本按摩器械是采用热疗原理起到减轻压力，减轻疲劳，缓解紧张，放松肌肉的作用。
The concrete was considered as crack progressing once the maximal principle of stress in the concrete reached the ultimate stress of concrete according to the theory of maximal tension stress.
根据最大拉应力理论，认为一旦混凝土的最大主应力大于混凝土材料的抗拉强度，就被视为混凝土开裂的微裂区域。
On this basis, the failure criterion of concrete simultaneously considering the freeze-thaw cycle and tension-compression ratio in principle stress space and octahedral space is established.
在此基础上，分析了双轴拉-压极限强度随冻融循环次数的变化规律，并在主应力空间和八面体应力空间建立了同时考虑冻融循环次数和拉压比的破坏准则。
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