Thermodynamic entropy generation in the course of the fatigue crack initiation
Source abstract
Abstract
Abstract Evolution of the thermodynamic entropy generation during fatigue crack initiation life of notched specimens is studied. A set of experimental results of AA7075‐T651 is examined to determine applicability of the thermodynamic entropy generation as an index of fatigue crack initiation. Entropy accumulation is calculated from hysteresis energy and temperature rise. An increasing trend of entropy accumulation with the number of cycle to failure is observed on macroscale measurements. Results also determine that the entropy generations from the samples under the same operating conditions are similar as the crack grows. Scanning electron microscope analysis is performed on the fractured surfaces to observe the fatigue striations, and persistent slip bands are observed employing an optical microscope. A discussion is presented regarding the length scales on which crack initiation occurs and entropy calculation is made.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Fatigue and fracture mechanics · Material Properties and Failure Mechanisms · High-Velocity Impact and Material Behavior
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Center for Risk and Reliability, Department of Mechanical Engineering University of Maryland College Park MD 20742 USA
References (69)
Show source-provided references
1. 10.1098/rspa.2009.034810.1098/rspa.2009.0348 ↗
2. 10.1098/rspa.2007.037110.1098/rspa.2007.0371 ↗
3. 10.1016/j.ijfatigue.2014.09.01410.1016/j.ijfatigue.2014.09.014 ↗
4. Imanian A.andModarres M.(2015)An entropy‐based theory of reliability with the application to corrosion fatigue.European Safety and Reliability ConferenceZürich Switzerland (ESREL2015).
5. Imanian A.andModarres M.(2015)Development of a generalized entropic framework for damage assessment with application to corrosion fatigue.ASME 2015 Applied Mechanics and Materials Conference McMAT2015 Seattle WA.
6. 10.3390/e1710699510.3390/e17106995 ↗
7. 10.1016/j.mechmat.2011.12.00310.1016/j.mechmat.2011.12.003 ↗
8. 10.1007/978-1-4614-5589-9_3110.1007/978-1-4614-5589-9_31 ↗
9. 10.1179/1743284715Y.000000007410.1179/1743284715Y.0000000074 ↗
10. 10.1016/j.mechmat.2011.09.00310.1016/j.mechmat.2011.09.003 ↗
11. 10.1109/ICCAD.2015.737264410.1109/ICCAD.2015.7372644 ↗
12. 10.1063/1.493474010.1063/1.4934740 ↗
13. 10.1016/j.proeng.2014.06.23010.1016/j.proeng.2014.06.230 ↗
14. 10.1063/1.482101510.1063/1.4821015 ↗
15. 10.1115/1.400600410.1115/1.4006004 ↗
16. Yong‐jian S.andLi‐sheng H.(2012)Low cycle fatigue life prediction of a 300 MW steam turbine rotor using a new nonlinear accumulation approach.Control and Decision Conference(CCDC) 2012 24th Chinese 3913–3918.10.1109/CCDC.2012.6244625 ↗
17. 10.1016/j.ijsolstr.2003.08.01810.1016/j.ijsolstr.2003.08.018 ↗
18. 10.3390/e1206134510.3390/e12061345 ↗
19. 10.1061/(ASCE)EM.1943‐7889.000093610.1061/(ASCE)EM.1943‐7889.0000936 ↗
20. 10.1016/j.matdes.2015.04.03410.1016/j.matdes.2015.04.034 ↗
21. 10.1016/j.ijfatigue.2006.01.01310.1016/j.ijfatigue.2006.01.013 ↗
22. 10.1177/073168441245267910.1177/0731684412452679 ↗
23. 10.1002/pc.2213410.1002/pc.22134 ↗
24. 10.1016/j.ijsolstr.2015.06.03210.1016/j.ijsolstr.2015.06.032 ↗
25. Cyclic plastic strain energy and fatigue of metals
26. The energy required for fatigue
27. 10.1016/S0308-0161(98)00100-810.1016/S0308-0161(98)00100-8 ↗
28. 10.1115/1.236059910.1115/1.2360599 ↗
29. 10.1243/03093247JSA60210.1243/03093247JSA602 ↗
30. 10.1007/978-1-4419-9792-0_7010.1007/978-1-4419-9792-0_70 ↗
31. 10.1115/1.326556510.1115/1.3265565 ↗
32. 10.1016/0308-0161(96)00008-710.1016/0308-0161(96)00008-7 ↗
33. 10.1016/S0142-1123(99)00111-510.1016/S0142-1123(99)00111-5 ↗
34. 10.1016/j.ijnonlinmec.2011.12.00210.1016/j.ijnonlinmec.2011.12.002 ↗
35. 10.1115/1.365888410.1115/1.3658884 ↗
36. Some observations on the plastic work required to fracture stainless steel under cyclic loading
37. 10.1115/1.366226810.1115/1.3662268 ↗
38. The cyclic behavior of mild steel at low endurances
39. 10.1115/1.322498210.1115/1.3224982 ↗
40. 10.1115/1.326436210.1115/1.3264362 ↗
41. Vesselinov K. V. D. D.andTchankov D. S.(1990)Estimation of dissipated energy under random loading and multiaxial state of stress. In:Proceedings Of the VI congress of theoret and appl mechVarna 171–175.
42. 10.1007/s11663-009-9240-410.1007/s11663-009-9240-4 ↗
43. 10.1016/j.ijfatigue.2012.10.00910.1016/j.ijfatigue.2012.10.009 ↗
44. 10.1201/b19094-53710.1201/b19094-537 ↗
45. 10.1111/j.1460-2695.1980.tb01108.x10.1111/j.1460-2695.1980.tb01108.x ↗
46. 10.1007/978-94-009-6821-9_1310.1007/978-94-009-6821-9_13 ↗
47. Middelford K. H. H.(1986)Thermometric investigation of the fatigue behaviour of power‐forged specimen. In:Proceedings of international powder metallurgy conference and exhibition. Verlag Schmid GmbH Freiburg 499–502.
48. 10.1016/S0142-1123(99)00088-210.1016/S0142-1123(99)00088-2 ↗
49. Thermographic detection of fatigue damage of reactor pressure vessel (RPV) steels
50. 10.1016/j.ijfatigue.2006.02.04310.1016/j.ijfatigue.2006.02.043 ↗
51. Kahirdeh A. Sauerbrunn C.andModarres M.(2015)Acoustic emission entropy as a measure of damage in materials.35th International Workshop on Bayesian Inference and Maximum Entropy Methods in Science and Engineering(MaxEnt 2015) Potsdam New York USA10.1063/1.4959066 ↗
52. 10.1177/105678950404105810.1177/1056789504041058 ↗
53. Lemaitre J. · 1994
54. 10.1201/b1272510.1201/b12725 ↗
55. De Groot S. R. · 2013
56. Ontiveros V. L. · 2014
57. 10.1209/0295-5075/20/5/00910.1209/0295-5075/20/5/009 ↗
58. Abdel‐Aziz M. Mahmoud T. S.andGaafer A. M.(2008)Fabrication and fatigue behavior study of metal matrix composite.17th ECF17 Brno Czech Republic.
59. 10.1051/rphysap:0198400190704670010.1051/rphysap:01984001907046700 ↗
60. 10.1016/0921-5093(89)90056-710.1016/0921-5093(89)90056-7 ↗
61. 10.1080/1478643740820723010.1080/14786437408207230 ↗
62. Halford G. R. · 1961
63. Manson S. S. · 1954
64. A study of the effect of cyclic thermal stresses on a ductile metal
65. 10.1016/j.ijplas.2006.07.00110.1016/j.ijplas.2006.07.001 ↗
66. 10.1016/j.ijfatigue.2014.06.00110.1016/j.ijfatigue.2014.06.001 ↗
67. 10.1111/j.1460-2695.2011.01577.x10.1111/j.1460-2695.2011.01577.x ↗
68. 10.1016/j.ijfatigue.2007.07.00510.1016/j.ijfatigue.2007.07.005 ↗
69. Brammer A. · 2013