Modeling fatigue crack growth behavior in rolled AZ31 magnesium alloy using CTOD based strip yield modeling
Source abstract
Abstract
Abstract Fatigue crack growth behavior of a rolled AZ31 magnesium plate is investigated and modelled in this study. Fatigue crack growth tests were performed on compact tension specimens at load ratios of R = 0.1 and R = 0.7 to provide data for a strip-yield based fatigue crack growth model. Minimal differences in crack closure were observed between the two load ratios. Threshold values for the stress intensity factor range were found to be often less than those reported in previous literature. The reason for lower threshold values could be related to the nontraditional compression pre-cracking method used in this study, which was employed in an attempt to produce a more accurate measurement of the fatigue crack threshold. In addition to the long crack fatigue crack growth testing using compact tension specimens, load controlled fatigue tests were conducted on flat, reduced gage specimens at load ratios of R = 0.1 and R = −1.0 to study the microstructurally small crack growth behavior and to extend the model capability to predict the microstructurally small crack growth behavior. The reduced gage specimens were found to spend the majority of their life in the crack growth stage. Cracks primarily grew in a planar fashion other than where multiple cracks coalesced. The microstructurally small crack growth data from these experiments were also compared with predictions from the fatigue crack growth model. Crack growth modeling revealed that traditional calculations using plasticity-induced crack closure concepts and an effective stress intensity factor range were not able to predict the microstructurally small crack growth behavior of these specimens. In contrast, computing crack growth rate from crack tip opening displacement was shown to give satisfactory results. Crack opening stresses for the fully reversed tests revealed that the compressive loading largely nullified the effect of the plastic wake on fatigue crack growth.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Magnesium Alloys: Properties and Applications · Aluminum Alloys Composites Properties · Advanced Welding Techniques Analysis
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (50)
Show source-provided references
1. Magnesium and its alloys applications in automotive industry10.1007/s00170-007-1279-2 ↗
2. Fatigue of magnesium alloys10.1002/adem.200400021 ↗
3. The effects of texture and extension twinning on the low-cycle fatigue behavior of a rolled magnesium alloy, AZ31B10.1016/j.msea.2010.07.047 ↗
4. Effect of anisotropy on the low-cycle fatigue behavior of rolled AZ31 magnesium alloy10.1016/j.msea.2009.08.044 ↗
5. Wonsiewicz · 1966
6. Multiaxial behaviour of wrought magnesium alloys – a review and suitability of energy-based fatigue life model10.1016/j.tafmec.2014.08.004 ↗
7. Effect of microstructure on fatigue behavior of AZ31 magnesium alloy10.1016/j.msea.2006.09.124 ↗
8. The influence of crack tip plasticity in the growth of small fatigue cracks10.1007/BF02657797 ↗
9. Propagation of short fatigue cracks10.1179/imr.1984.29.1.445 ↗
10. The influence of microstructure on the growth of small fatigue cracks10.1111/j.1460-2695.1985.tb01201.x ↗
11. Microstructure-based fatigue modeling of cast A356–T6 alloy10.1016/S0013-7944(02)00021-8 ↗
12. Crack deflection: implications for the growth of long and short fatigue cracks10.1007/BF02663313 ↗
13. Crystallographic orientation dependence of fatigue crack propagation behavior in rolled AZ31 magnesium alloy10.4028/www.scientific.net/MSF.654-656.723 ↗
14. The role of twinning–detwinning on fatigue fracture morphology of Mg–3%Al–1%Zn alloy10.1016/j.msea.2008.04.056 ↗
15. Twinning–detwinning behavior during fatigue-crack propagation in a wrought magnesium alloy AZ31B10.1016/j.msea.2012.06.088 ↗
16. Suresh · 1998
17. Effect of twinning, slip, and inclusions on the fatigue anisotropy of extrusion-textured AZ61 magnesium alloy10.1016/j.msea.2011.05.047 ↗
18. High cycle fatigue of a die cast AZ91E-T4 magnesium alloy10.1016/j.actamat.2003.11.018 ↗
19. Identification and modeling of fatigue crack growth mechanisms in a die-cast AM50 magnesium alloy10.1016/j.actamat.2006.06.039 ↗
20. Microstructure-based multistage fatigue modeling of a cast AE44 magnesium alloy10.1016/j.ijfatigue.2006.07.005 ↗
21. Role of different material processing methods on the fatigue behavior of an AZ31 magnesium alloy10.1016/j.ijfatigue.2013.02.017 ↗
22. Newman Jr. JC. Crack-closure model for predicting fatigue crack growth under aircraft spectrum loading. vol. ASTM STP 748; 1981. p. 53–84.10.1520/STP28334S ↗
23. A modified strip-yield model for prediction of plasticity-induced closure in surface flaws10.1046/j.1460-2695.1998.00073.x ↗
24. Strip-yield and finite element analysis of part-through surface flaws10.1016/S0013-7944(00)00032-1 ↗
25. Newman · 2005
26. Fatigue-life prediction methodology using small-crack theory10.1016/S0142-1123(98)00058-9 ↗
27. Daniewicz SR. Evaluating the influence of plasticity-induced closure on surface flaw shape evolution under cyclic loading using a modified strip-yield model. Adv Fatigue Crack Clos Meas Anal. Second, Vol., ASTM International; 1999.10.1520/STP15770S ↗
28. Tanaka K. Mechanics and micromechanics of fatigue crack propagation. In: Wei R, Gangloff R, editors. Fract Mech Perspect Dir Twent Symp, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959: ASTM International; 1989, p. 151-151-33.10.1520/STP18824S ↗
29. Fatigue behaviour and fracture mechanism of a rolled AZ31 magnesium alloy10.1016/j.ijfatigue.2004.03.015 ↗
30. E647, Standard test method for measurement of fatigue crack growth rates
31. ASTM Standard. E9-09. Standard test methods of compression testing of metallic materials at room temperature. Phila USA ASTM Int; 2002.
32. Quantifying microstructurally small fatigue crack growth in an aluminum alloy using a silicon-rubber replica method10.1016/j.ijfatigue.2011.07.016 ↗
33. Compression precracking methods to generate near-threshold fatigue-crack-growth-rate data10.1016/j.ijfatigue.2009.02.030 ↗
34. Standard test methods for determining average grain size
35. Enhancing the fatigue property of rolled AZ31 magnesium alloy by controlling 10–12 twinning-detwinning characteristics10.1557/JMR.2010.0094 ↗
36. A crystal plasticity theory for latent hardening by glide twinning through dislocation transmutation and twin accommodation effects10.1016/j.jmps.2009.12.004 ↗
37. Enhanced deformation mechanisms by anisotropic plasticity in polycrystalline Mg alloys at room temperature10.1007/s11661-005-0032-4 ↗
38. An experimental study of fatigue crack propagation in extruded AZ31B magnesium alloy10.1016/j.ijfatigue.2012.08.010 ↗
39. An examination of methods of assessing interacting surface cracks by comparison with experimental data10.1016/0308-0161(94)00052-2 ↗
40. Iida K. Shapes and coalescence of surface fatigue cracks. In: Procedings ICF Int Symp Fract Mech, vol. 679–693, Bejing, China; 1983.
41. Fujimoto WT. Determination of crack growth and fracture toughness parameters for surface flaws emanating from fastener holes. In: Proc. AIAAASMESEA 17th Struct Struct Dyn Mater Conf King Prussia PA; 1976.10.2514/6.1976-1552 ↗
42. Saff · 1984
43. Elastic solutions for corner cracks undergoing uniform displacement-controlled loading10.1007/BF00032451 ↗
44. Weight function method for three dimensional crack problems—II. Application to surface cracks at a hole in finite thickness plates under stress gradients10.1016/0013-7944(89)90123-9 ↗
45. McClintock · 1999 · 227
46. A comparison of crack-tip field parameters for large and small fatigue cracks10.1115/1.3225868 ↗
47. Small fatigue cracks, The Metallurgical Society of the American Institute of mining
48. Dislocation motion in magnesium: a study by molecular statics and molecular dynamics10.1088/0965-0393/17/7/075009 ↗
49. A dislocation model for fatigue crack growth in metals10.1080/14786436808218181 ↗
50. Laird · 1967