TY - JOUR
T1 - Mixed-mode fracture & non-planar fatigue analyses of cracked I-beams, using a 3D SGBEM-FEM Alternating Method
AU - Tian, Longgang
AU - Dong, Leiting
AU - Bhavanam, Sharada
AU - Phan, Nam
AU - Atluri, Satya N.
N1 - Funding Information:
The first author gratefully acknowledges the financial support of China Scholarship Council (Grant No. 201306260034 ); National Basic Research Program of China (973 Program: 2011CB013800 ); and New Century Excellent Talents Project in China ( NCET-12-0415 ).
Publisher Copyright:
© 2014 Elsevier Ltd.
PY - 2014
Y1 - 2014
N2 - In the present paper, computations of mixed mode stress intensity factor (SIF) variations along the crack front, and fatigue-crack-growth simulations, in cracked I-beams, considering different load cases and initial crack configurations, are carried out by employing the three-dimensional SGBEM (Symmetric Galerkin Boundary Element Method)-FEM (Finite Element Method) Alternating Method. For mode-I cracks in the I-beam, the computed SIFs by using the SGBEM-FEM Alternating Method are in very good agreement with available empirical solutions. The predicted fatigue life of cracked I-beams agrees well with experimental observations in the open literature. For mixed-mode cracks in the web or in the flange of the I-beams, no analytical or empirical solutions are available in the literature. Thus mixed-mode SIFs for mixed-mode web and flange cracks are presented, and non-planar fatigue growth simulations are given, as benchmark examples for future studies. Moreover, because very minimal efforts of preprocessing and very small computational burden are needed, the current SGBEM-FEM Alternating Method is very suitable for fracture and fatigue analyses of 3D structures such as I-beams.
AB - In the present paper, computations of mixed mode stress intensity factor (SIF) variations along the crack front, and fatigue-crack-growth simulations, in cracked I-beams, considering different load cases and initial crack configurations, are carried out by employing the three-dimensional SGBEM (Symmetric Galerkin Boundary Element Method)-FEM (Finite Element Method) Alternating Method. For mode-I cracks in the I-beam, the computed SIFs by using the SGBEM-FEM Alternating Method are in very good agreement with available empirical solutions. The predicted fatigue life of cracked I-beams agrees well with experimental observations in the open literature. For mixed-mode cracks in the web or in the flange of the I-beams, no analytical or empirical solutions are available in the literature. Thus mixed-mode SIFs for mixed-mode web and flange cracks are presented, and non-planar fatigue growth simulations are given, as benchmark examples for future studies. Moreover, because very minimal efforts of preprocessing and very small computational burden are needed, the current SGBEM-FEM Alternating Method is very suitable for fracture and fatigue analyses of 3D structures such as I-beams.
KW - Fatigue crack growth
KW - I-beam
KW - SGBEM-FEM Alternating Method
KW - Stress intensity factor
UR - http://www.scopus.com/inward/record.url?scp=84922291059&partnerID=8YFLogxK
U2 - 10.1016/j.tafmec.2014.10.002
DO - 10.1016/j.tafmec.2014.10.002
M3 - Article
AN - SCOPUS:84922291059
VL - 74
SP - 188
EP - 199
JO - Theoretical and Applied Fracture Mechanics
JF - Theoretical and Applied Fracture Mechanics
SN - 0167-8442
IS - 1
ER -