Humidity and temperature doubly shifted fracture energy master curves for the prediction of sealant adhesion to aluminum under climate induced cyclic strain
- Virginia Tech, Blacksburg, VA (United States)
The objective of this research was to construct fracture energy master curves for the sealant/aluminum interphase using a 45{degrees} peel test; and use these curves to predict the annual crack growth of a sealant/aluminum butt Joint exposed to various climates. The shifting variables were humidity and temperature. The crack speed vs. fracture energy was measured using a 45{degrees} peel test and master curves were constructed. The location and mechanism of the failure zone was related to the shifting variables. For the butt joint, a pure shear (a thin long butt joint) adhesion test was used to measure the crack speed vs. strain energy as a function of temperature, relative humidity was held constant. An equation was constructed which relates the crack speed in the butt joint to the strain energy, temperature and relative humidity using the shift factor equation from the peel test. Climate data for Wittman, Arizona and Miami, Florida was used to determine the daily strain energy, temperature and relative humidity for the hypothetical butt joint. Finally, this data was combined with the master curve equations and butt joint equations to calculate the crack length at any time for the two climates.
- OSTI ID:
- 441527
- Report Number(s):
- CONF-960214-; TRN: 96:006556-0060
- Resource Relation:
- Conference: 19. annual meeting of the Adhesion Society, Inc, Myrtle Beach, SC (United States), 18-21 Feb 1996; Other Information: PBD: 1996; Related Information: Is Part Of Proceedings of the 19th annual meeting of the Adhesion Society; Ward, T.C. [ed.]; PB: 567 p.
- Country of Publication:
- United States
- Language:
- English
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