CAJ | 학술논문

　　对于线弹性材料，裂缝尖端平行于裂缝方向的 T应力会影响裂缝的扩展方向和起裂断裂韧度，然而在混凝土类准脆性材料的断裂韧度测试中，无论是起裂断裂韧度还是失稳断裂韧度，T应力的影响却少有研究。以混凝土Ⅰ型断裂韧度测试常用的三点弯曲梁、楔入劈拉试件为对象，计算了裂缝尖端的 T应力大小，并分析了其对裂缝扩展方向和断裂韧度的影响。分析计算结果表明：这些常用试件裂缝尖端的 T应力相比于裂缝尖端控制因素应力强度因子K 很小，不会影响裂缝扩展方向，保证了混凝土断裂失稳前一直处于Ⅰ型裂缝状态；另外，T应力对起裂断裂韧度和失稳断裂韧度的数值也不会产生影响，说明常用试件进行的混凝土断裂韧度确定方法是可靠有效的。
　　대우선탄성재료，렬봉첨단평행우렬봉방향적 T응력회영향렬봉적확전방향화기렬단렬인도，연이재혼응토류준취성재료적단렬인도측시중，무론시기렬단렬인도환시실은단렬인도，T응력적영향각소유연구。이혼응토Ⅰ형단렬인도측시상용적삼점만곡량、설입벽랍시건위대상，계산료렬봉첨단적 T응력대소，병분석료기대렬봉확전방향화단렬인도적영향。분석계산결과표명：저사상용시건렬봉첨단적 T응력상비우렬봉첨단공제인소응력강도인자K 흔소，불회영향렬봉확전방향，보증료혼응토단렬실은전일직처우Ⅰ형렬봉상태；령외，T응력대기렬단렬인도화실은단렬인도적수치야불회산생영향，설명상용시건진행적혼응토단렬인도학정방법시가고유효적。
For linear‐elastic materials ,the presence of T‐stress ,w hich acts parallel to a crack ,will strongly affect the fracture onset and fracture failure . For concrete‐like quasi‐brittle materials , however ,little attention has been focused on the T‐stress influence on fracture toughness ,including initiation fracture toughness and unstable fracture toughness . So three‐point‐bending beams and wedge‐splitting specimens under mode‐I fracture are used to compute T‐stress ,and then its influences on the crack path and fracture toughness are analyzed .It is show n that T‐stress for these commonly‐used specimens is so small compared to its corresponding stress intensity factor K ,dominant factor around the crack tip .T he pre‐fabricated crack propagates along the line of the initial crack ,i .e .,the crack will stay under mode‐I fracture .In addition , T‐stress has no influence on concrete fracture toughness ,w hich indicates the commonly‐used specimens for determining concrete fracture toughness are reliable and reasonable .