结构钢断裂机理及抗断设防
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摘要
结合古典强度理论和微观断裂力学对金属屈服和断裂解释的力学原理,通过对结构钢深槽刻痕杆刻痕根部微观断裂应力场的数值模拟,导出了结构钢在应力三轴空间的屈服轨迹方程。随后,根据结构钢在三向等拉伸应力状态下屈服和宏观脆断的重合性,提出了结构钢在应力三轴空间宏观韧、脆断准则。最后,给出了该屈服和断裂模型的物理解释及结构钢破坏设防。
Combining mechanics theory of yield and fracture of ductile metal in classical strength theory with microcosmic fracture mechanics,and by studying fracture stress field in root of notched bar made of constructional steel,the author brought forward loci equation of constructional steel in stress triaxiality space.Later,on basis of simultaneity of yield and brittle fracture of constructional steel in tri-axial symmetrical pull stress field,this paper deduced ductile-brittle fracture criterion in stress trixiality space.At last,the author gave mechanics explanation of the yield and fracture model and design recommendations of constructional steel.
Combining mechanics theory of yield and fracture of ductile metal in classical strength theory with microcosmic fracture mechanics,and by studying fracture stress field in root of notched bar made of constructional steel,the author brought forward loci equation of constructional steel in stress triaxiality space.Later,on basis of simultaneity of yield and brittle fracture of constructional steel in tri-axial symmetrical pull stress field,this paper deduced ductile-brittle fracture criterion in stress trixiality space.At last,the author gave mechanics explanation of the yield and fracture model and design recommendations of constructional steel.
引文
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[2]俞茂宏.双剪强度理论及其应用[M].北京:科学出版社,1998.
[3]Taylor G I,Quinney H.The Plastic distortion of metal[J].Phil.Trans.Roy.Soc.,1931,230:323-362.
[4]Drucker D C,Prager W.Soil mechanics and plastic analysis or limitdesign[J].Quarterly of Applied Mathematics,1952,10:157-165.
[5]陈惠发,萨里普.土木工程材料的本构方程(第一卷:弹性与建模)[M].武汉:华中科技大学出版社,2000.
[6]Lemaitre J A.A course on damage mechanics[M].Spring-Verlag,Berlin,Germany,1996.
[7]弗里德曼P W.金属机械强度(第一册)[M].北京:机械工业出版社,1982.
[8]匡震邦,顾海澄,李中华.材料的力学行为[M].北京:高等教育出版社,1998.
[9]宋振森.刚性钢框架梁柱节点在地震作用下的累积损伤破坏机理及抗震设计对策[D].西安:西安建筑科技大学,2001.
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