Mixed-mode fatigue crack growth and life prediction of an automotive adhesive bonding system

Published on Nov 10, 2017in Engineering Fracture Mechanics3.426
· DOI :10.1016/J.ENGFRACMECH.2017.11.004
Qiuren Chen3
Estimated H-index: 3
(NUAA: Nanjing University of Aeronautics and Astronautics),
Haiding Guo11
Estimated H-index: 11
(NUAA: Nanjing University of Aeronautics and Astronautics)
+ 2 AuthorsXuming Su18
Estimated H-index: 18
(Ford Motor Company)
Source
Abstract
Abstract Mixed-mode fatigue crack growth behavior of an automotive adhesive bonding system (AA5754O- A951-BM4601) has been investigated using a compound compact mixed-mode specimen. The test was performed under load control with 0.1 R ratio and 3Hz frequency. A long-distance moving microscope was employed to record the real-time length of the fatigue crack in the adhesive layer during testing. The strain energy release rate components of the crack were analyzed by finite element method. The pure-mode fatigue crack growth test results show that a given value of G I results in a fatigue crack growth rate over an order of magnitude higher than for an equal value of G II. The mixed- mode tests results indicate that under a given loading angle, the fatigue crack growth behavior is also influenced by the test load due to the changing shear mode ratio when the crack grows. The fatigue crack growth data were then processed by a generalized Paris relation formula and employed in the direct fatigue life prediction of single lap shear joints with the same bonding system. The life prediction shows good results in the low-cycle region but slightly conservative results in the high- cycle region when compared to coupon fatigue tests.
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