期刊
INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES
卷 83, 期 -, 页码 41-49出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ijadhadh.2018.02.011
关键词
Epoxides; Fatigue; Durability; Temperature effect; Variable amplitude loading; Cumulative damage
资金
- AiF under the program for the promotion of joint industrial research and development (IGF) of the Federal Ministry of Economics and Energy of the German Bundestag [428 ZN/2]
- Science without Borders Program (Ciencia sem Fronteiras) [13458/13-2]
Under working conditions, adhesively bonded structures are exposed to variable cyclic loading and temperature variation. However, there is still limited number of works dealing with their relationship. The present study investigates the combined effect of variable amplitude stress and variation of temperature on the fatigue damage behaviour of adhesively bonded scarf joints. Initially, experiments at constant amplitude stress, which showed reduction of fatigue strength with increasing temperature, were carried out to establish base SN curves for calculations of cumulative damage. Then, tests under variable amplitude fatigue (VAF) were performed with constant temperature and with two, four and six temperature changes. Temperatures for VAF experiments were - 10, 23 and 50 degrees C. VAF at constant temperature demonstrated: (i) damage retardation at - 10 and 23 degrees C and damage acceleration at 50 degrees C and (ii) no clear effect on the fracture mode. Conversely, VAF with temperature variation showed: (i) high damage acceleration with an increase proportional to the number of temperature changes and (ii) a trend of more adhesive failure. For lifetime predictions made with a linear damage rule, good correlation was obtained at constant temperature. However, under variable temperature conditions caution must be taken since predictions overestimated fatigue lifetime.
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