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Determination and Applications of U and K$_{op}$ for Crack Closure Evaluation under Mixed-mode loading  

Song Samhong (Department of Mechanical Engineering, Korea University)
Seo Kijeong (Department of Mechanical Engineering, Graduate School, Korea University)
Lee Jeongmoo (Research Institute of Engineering & Technolgy, Korea University)
Publication Information
Transactions of the Korean Society of Automotive Engineers / v.13, no.3, 2005 , pp. 178-185 More about this Journal
Abstract
Crack tip displacement is originated by tensile stress component, s and shear stress component, t on pure Mode I and pure Mode II. The crack tip displacement(CTD) depends on combined types of different two stress components under mixed-mode loading conditions (MMLC). Thus, the analysis of crack tip displacement must be CTD vector, dv which is composition of ds and dt under MMLC. In this paper, various effects of MMLC on the crack closure are studied experimentally. The crack closure magnitude is calculated from the information of crack tip displacement under MMLC. This information has been obtained from the high resolution optical microscope in direct observations of crack displacement behavior at the crack tip. Observed crack tip displacement is analyzed by using CTD vector to determine crack opening load. The various effects of MMLC on the crack closure are explained using crack opening ratio with crack length and mode mixture. The effective stress intensity factor considering crack closure is also discussed.
Keywords
균열닫힘;균열열림비;균열선단변위벡터;혼합모드하중조건;모드혼합도;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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1 W. Elber, 'The Significance of Fatigue Crack Closure,' ASTM STP 486, pp.230-242, 1971
2 J. J. Lee and W. N. Jr. Sharpe, 'Closure Measurements on Short Fatigue Cracks,' Mechanics of Fatigue Crack Closure, ASTM STP 982, pp.270-278, 1988
3 D. C. Daile, 'The Crack Tip Displacement Vector Approach to Mixed-Mode Fracture,' Mixed-Mode Crack Behavior, ASTM STP 1359, pp.21-41, 1999
4 L. W. WEI and M. N. JMES, 'Fatigue Crack Closure for Inclined and Kinked Cracks,' Int. J. of Fracture, Vol.116, pp.25-50, 2002   DOI   ScienceOn
5 T. Nicholas, A. N. Palazotto and E. Bednarz, 'An Analytical Investigation of Plasticity Closure Involving Short Cracks,' ASTM STP 982, pp.361-379, 1988
6 D. H. Chen and H. Nisitani, 'Analytical and Experimental Study of Crack Closure Behavior Based on an S-Shaped Unloading Curve,' ASTM STP 982, pp.475-488, 1988
7 J. Tong, J. R. Yates and M. W. Brown, 'A Model for Sliding Mode Crack Closure. Part I: Theory for Pure Mode II Loading,' Engineering Fracture Mechanics, Vol.52, pp.599-611, 1995   DOI   ScienceOn
8 S. H. Song and J. M. Lee, 'A Study on Fatigue Behavior at Pre-crack Tip under Mixed-mode Single Overloading (In the case of using the C-scan method),' Key Engineering Materials, Vol.270-273, pp.1171-1176, 2004   DOI
9 J. Tong, J. R. Yates and M. W. Brown, 'A Model for Sliding Mode Crack Closure. Part II: Mixed Mode Loading and Applications,' Engineering Fracture Mechanics, Vol.52, pp.613-623, 1995   DOI   ScienceOn
10 C. Li, 'Vector CTD Criterion Applied to Mixed mode Fatigue Crack Growth,' Fatigue Fracture Eng. Mater. Struct., Vol.12, No.1, pp.59-65, 1989   DOI
11 H. A. Richard, 'Some Theoretical and Experimental Aspects of Mixed Mode Fracture,' Advances Fracture Research, Vol.5, pp.3337-3344, 1986
12 S. Y. Kim and B. S. Lim, 'The Effect of Loading Waveform on the High Temperature Fatigue Crack Propagation in P92 and STS 316L Steel,' Transactions of KSAE, Vol.10, No.4, pp.136-140, 2002
13 H. A. Richard and K. Benitz, 'A Loading Device for the Criterion of Mixed Mode in Fracture Mechanics,' Int. J. of Fracture, Vol.22, pp.R55-R58, 1983   DOI
14 J. K. Sheth and W. W. Gerberich, 'The Effect of Test Frequency and Geometric Asperities on Crack Closure Mechanisms,' ASTM STP 982, pp.112-120, 1988
15 K. Tanaka, 'Fatigue Crack Propagation from a Crack Inclined to the Cyclic Tensile Axis,' Engineering Fracture Mechanics, Vol.6, pp.493-507, 1974   DOI   ScienceOn
16 H. U. Staal and J. D. Elen, 'Crack Closure and Influence of Cycle Ratio R on Fatigue Crack Growth in Type 304 Stainless Steel at Room Temperature,' Engineering Fracture Mechanics, Vol.11, pp.275-283, 1979   DOI   ScienceOn
17 ASTM E647, 'Standard Test Method for Measurement of Fatigue Crack Growth Rates,' Annual Book of ASTM Standards, Vol.03.01, pp.565-601, 1995