Abstract
Short crack growth behavior from a notch including crack closure and load ratio effects was investigated. Experiments and analyses were carried out using four-point bending specimens made of SAE 1045 steel, using a blunt notch keyhole specimen geometry. The lower the load ratio, the more notch effect on short crack growth behavior was observed. Short cracks in the notch affected zone had higher growth rates than long cracks. After the crack grew out of the notch effect field, short crack growth rates merged with the long crack growth rates. Several parameters were used to correlate the short crack growth rates including stress intensity factor range, effective stress intensity factor range, and stress intensity factor range based on notch root stress.
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References
Ahmad HY, Yates JR (1994) An elastic-plastic model for fatigue crack growth at notches. Fatigue Fract Eng Mater Struct 17: 651–660
Ahmad HY, Clode MP, Yates JR (1997) Prediction of fatigue crack growth in notched members. Int J Fatigue 19: 703–712
ASTM Standard E647-00 (2003) Standard test method for measurement of fatigue crack growth rates. Annual Book of ASTM Standards, vol 03.01, American Society for Testing and Materials, Philadelphia, PA, pp 615–657
Dowling NE (1979) Notched member fatigue life predictions combining crack initiation and propagation. Fatigue Eng Mater Struct 2: 129–138
El Haddad ME, Smith KN, Topper TH (1979) A strain based intensity factor solution for short fatigue cracks initiating from notches. In: Smith CW (ed) Fracture mechanics: proceedings of the eleventh national symposium on fracture mechanics: part I, ASTM STP 677, pp 274–289
El Haddad ME, Smith KN, Topper TH (1979) Fatigue crack propagation of short crack. Trans ASME J Eng Mater Technol 101: 42–46
El Haddad MH, Dowling NE, Topper TH, Smith KN (1980) J integral applications for short fatigue cracks at notches. Int J Fract 16: 15–30
FRANC2D Version 2.7 (1995) Tutorial and user’s guide
Hammouda MM, Smith RA, Miller KJ (1979) Elastic-plastic fracture mechanics for initiation and propagation of notch fatigue cracks. Fatigue Fract Eng Mater Struct 2: 139– 154
Hammouda MMI, Sallam HEM, Osman HG (2004) Significance of crack tip plasticity to early notch fatigue crack growth. Int J Fatigue 26: 173–182
Leis B (1985) Displacement controlled fatigue crack growth in inelastic notch fields-implications for short cracks. Eng Fract Mech 22: 279–293
Li WF (2003) Short fatigue crack propagation and effect of notch plastic field. Nucl Eng Des 84: 193–200
Locke WR, Byrne J, Hussey IW (1995) The influence of confined notch plasticity on small fatigue crack growth. Int J Fatigue 17: 287–292
McClung RC, Sehitoglu H (1992) Closure and growth of fatigue cracks at notches. ASME J Eng Mater Technol 114
Motoyashiki Y, Bruckner-Foit A, Englert L, Haag L, Wollenhaupt M, Baumert T (2006) Use of femtosecond laser technique for studying physically small cracks. Int J Fract 139(3–4): 561–568
Newman JC (1971) An improved method of collocation for the stress analysis of cracked plates with various shaped boundaries. NASA Technical Note D-6376, Langley, VA
Ogura K, Miyoshi Y, Nishikawa I (1987) Fatigue crack growth and closure of small cracks at the notch root, current research on fatigue cracks. Elsevier Applied Science, London, pp 67–91
Pommier S, Lopez-Crespo P, Decreuse Y (2009) A multi-scale approach to condense the cyclic elastic-plastic behavior of the crack tip region into an extended constitutive model. Fatigue Fract Eng Mater Struct 32: 899–915
Qian J, Fatemi A (1996) Fatigue crack growth under mixed-mode I and II loading. Fatigue Fract Eng Mater Struct 19: 1277–1284
Sansoz F, Brethes B, Pineau A (2002) Propagation of short fatigue cracks from notches in a Ni base superalloy: experiments and modeling. Fatigue Fract Eng Mater Struct 25: 41–53
Shin CS, Smith RA (1985) Fatigue crack growth from sharp notches. Int J Fatigue 7(2): 87–93
Shan ZH, Wang ZG, Zhang Y (1997) Effect of notch geometry on short fatigue crack growth in 8090 Al-Li alloy. J Mater Sci 32: 4673–4677
Smith RA, Miller KJ (1977) Fatigue cracks at notches. Int J Mech Sci 19: 11–22
Smith RA, Miller KJ (1978) Prediction of fatigue regimes in notched components. Int J Mech Sci 20: 201–206
Stephens RI, Fatemi A, Stephens RR, Fuchs HO (2000) Metal fatigue in engineering, 2nd edn. Wiley, New York
Swain MH (1992) Monitoring small-crack growth by the replication method. ASTM STP 1149, small crack test methods. In: Larsen JM, Allison JE (eds) American society for testing and materials, pp 34–56
Tanaka K, Nakai Y (1983) Propagation and non-propagation of short fatigue cracks at a sharp notch. Fatigue Fract Eng Mater Struct 6: 315–327
Zhang H, Fatemi A (2010) Short fatigue crack growth behavior under mixed-mode loading. Int J Fract 165(1): 1–19
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Hui Zhang—Formerly Graduate Research Assistant at The University of Toledo.
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Zhang, H., Fatemi, A. Short fatigue crack growth from a blunt notch in plate specimens. Int J Fract 170, 1–11 (2011). https://doi.org/10.1007/s10704-011-9597-7
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DOI: https://doi.org/10.1007/s10704-011-9597-7