English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Brazed superalloy honeycomb panels with thin high-strength face sheets are under development for the thermal protection system of future reusable launch vehicles. These veldcles use the honeycomb panels as an active and load-bearing part of their primary structure. The panels will be subject to repetitive dynamic stresses, caused by mechanical, thermal and acoustic loading. One of the most important properties with respect to long-term dynamic loading is fatigue crack growth resistance. However, crack propagation in superalloy foils, used in lightweight panels, is still relatively unexplored. This paper reports on the fatigue crack growth behavior in 250 pm thick Inconel 718 foil at RT, 400 OC, and 550 "C. The principal goals of the paper are to describe the technique used for cyclic crack growth rate testing and to report cyclic fatigue crack growth rates at elevated temperature. The relationship between dddN and AK obeys the Paris law da/dN = C LIP but the values measured for the exponent, m, are higher than 5. This is sigdicantly higher than the exponents typically found for fatigue crack growth in thicker Inconel 718 specimens. A possible explanation for the strong increase of the da/dN with AK is the low fracture toughness of Inconel 718 foil. The measured value for the foil (35 MPa ml")js less than half of the reported plane strain fracture toughness. Superalloys 718, 625, 706 and Various Derivatives Edited by E.A. Loria TIvIS (The Minerals, Metals 8r Materials Society), 2001

Fatigue Crack Growth in INconel 718 Superalloy Foil at Elevated Temperature