大连理工大学学报Issue(4)：537-542,6.
T应力对混凝土断裂参数测定有效性的影响
Effect of T-stress on validity of determination of concrete f racture parameters
摘要
Abstract
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 .关键词
混凝土/断裂力学/断裂韧度/T应力Key words
concrete/fracture mechanics/fracture toughness/T-stress分类
数理科学引用本文复制引用
赵艳华,甘楠楠..T应力对混凝土断裂参数测定有效性的影响[J].大连理工大学学报,2013,(4):537-542,6.基金项目
国家自然科学基金资助项目（50708014）． （）
