Fracture assessment of U-notches under mixed mode loading:: two procedures based on the 'equivalent local mode I' concept

被引:144
作者
Berto, F. [2 ]
Lazzarin, P. [2 ]
Gomez, F. J. [1 ]
Elices, M. [1 ]
机构
[1] Univ Politecn Madrid, Dept Mat Sci, ETS Ingn Caminos, E-28040 Madrid, Spain
[2] Univ Padua, Dept Management & Engn, I-36100 Vicenza, Italy
关键词
U-notches; mixed mode; local mode I; strain energy density (SED); cohesive zone model (CZM);
D O I
10.1007/s10704-008-9213-7
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Two fracture criteria are proposed and applied to blunt-notched components made of brittle materials loaded under mixed mode; the former is based on the averaged strain energy density over a given control volume, the latter on the cohesive crack zone model. In both instances use of the equivalent local mode I hypothesis is made. Only two material properties are needed: the ultimate tensile strength and the fracture toughness. Numerical predictions of rupture loads from the two criteria are compared with experimental measurements from more than 160 static tests with notched beams. The samples are made of PMMA and tested at -60 degrees C to assure a bulk behaviour almost linear elastic up to rupture. Notch root radii range from 0.2 to 4.0 mm and load mixicity varies from pure mode I to a prevailing mode II. The good agreement between theory and experimental results adds further confidence to the proposed fracture criteria.
引用
收藏
页码:415 / 433
页数:19
相关论文
共 73 条
[1]  
[Anonymous], 1990, FRACTURE MECH CRITER
[2]   A unified treatment of the mode I fatigue limit of components containing notches or defects [J].
Atzori, B ;
Lazzarin, P ;
Meneghetti, G .
INTERNATIONAL JOURNAL OF FRACTURE, 2005, 133 (01) :61-87
[3]   Fracture mechanics and notch sensitivity [J].
Atzori, B ;
Lazzarin, P ;
Meneghetti, G .
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES, 2003, 26 (03) :257-267
[4]   Notch Sensitivity and Defect Sensitivity under Fatigue Loading: Two Sides of the Same Medal [J].
Bruno Atzori ;
Paolo Lazzarin .
International Journal of Fracture, 2001, 107 (1) :1-8
[5]  
Baant ZP., 1998, Fracture and size effect in concrete and other quasibrittle materials, V1st ed.
[6]  
Barenblatt GI., 1962, ADV APPL MECH, V7, P55, DOI DOI 10.1016/S0065-2156(08)70121-2
[7]   J-integral evaluation for U- and V-blunt notches under Mode I loading and materials obeying a power hardening law [J].
Berto, F. ;
Lazzarin, P. ;
Matvienko, Yu. G. .
INTERNATIONAL JOURNAL OF FRACTURE, 2007, 146 (1-2) :33-51
[8]   Relationships between J-integral and the strain energy evaluated in a finite volume surrounding the tip of sharp and blunt V-notches [J].
Berto, F. ;
Lazzarin, P. .
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES, 2007, 44 (14-15) :4621-4645
[9]  
BUDIANSKY B, 1973, J APPL MECH-T ASME, V40, P201, DOI 10.1115/1.3422926