Tensile tests and analyses of notched specimens fabricated from high strength steels using a generalized yield model
作者： W. WANG , X. QIAN , R. SU , X. WANG
DOI: 10.1111/J.1460-2695.2010.01443.X
关键词:
摘要: This article summarises the uniaxial tension tests for 20 notched bars fabricated from high strength steel Q345 specified in Chinese National Standards. The effects of notch radius, r, and that depth ratio, d/D, on ductility fracture resistance this are examined. experimental data further analyzed using a generalized yield model together with an elliptical stress envelope originally proposed by first author. results demonstrate cracks initiate at section, surface filled many dimples shearing marks. Specimens sharper radius (a smaller r) larger d/D ratio) show poor ductility, but strength. field computed numerical procedure including indicates crack initiation occurs centre section which experiences highest triaxiality ratio (σ m /σ seq ). As stresses reach limiting values determined criterion, macroscopic failure bar occurs.
sci-hub.se 参考文章(14)
Percy Williams Bridgman, Studies in Large Plastic Flow and Fracture Harvard University Press. ,(2013) , 10.4159/HARVARD.9780674731349
Jean Lemaitre, A Course on damage mechanics Springer Berlin Heidelberg. ,(1992) , 10.1007/978-3-642-18255-6
G. Mirone, Role of stress triaxiality in elastoplastic characterization and ductile failure prediction Engineering Fracture Mechanics. ,vol. 74, pp. 1203- 1221 ,(2007) , 10.1016/J.ENGFRACMECH.2006.08.002
J.W. Hancock, A.C. Mackenzie, On the mechanisms of ductile failure in high-strength steels subjected to multi-axial stress-states Journal of the Mechanics and Physics of Solids. ,vol. 24, pp. 147- 160 ,(1976) , 10.1016/0022-5096(76)90024-7
Liang Xue, Stress based fracture envelope for damage plastic solids Engineering Fracture Mechanics. ,vol. 76, pp. 419- 438 ,(2009) , 10.1016/J.ENGFRACMECH.2008.11.010
Yingbin Bao, Tomasz Wierzbicki, On the cut-off value of negative triaxiality for fracture Engineering Fracture Mechanics. ,vol. 72, pp. 1049- 1069 ,(2005) , 10.1016/J.ENGFRACMECH.2004.07.011
K. Nahshon, J.W. Hutchinson, Modification of the Gurson Model for shear failure European Journal of Mechanics A-solids. ,vol. 27, pp. 1- 17 ,(2008) , 10.1016/J.EUROMECHSOL.2007.08.002
Mao-hong Yu, Advances in strength theories for materials under complex stress state in the 20th Century Applied Mechanics Reviews. ,vol. 55, pp. 169- 218 ,(2002) , 10.1115/1.1472455
J. Toribio, A fracture criterion for high-strength steel notched bars Engineering Fracture Mechanics. ,vol. 57, pp. 391- 404 ,(1997) , 10.1016/S0013-7944(97)00027-1
Yingbin Bao, Dependence of ductile crack formation in tensile tests on stress triaxiality, stress and strain ratios Engineering Fracture Mechanics. ,vol. 72, pp. 505- 522 ,(2005) , 10.1016/J.ENGFRACMECH.2004.04.012