Influence of foreign object impact mode on fatigue performance of 2198‐T8 Al‐Li alloy thin sheets for fuselage

2020 ◽  
Vol 44 (1) ◽  
pp. 115-128
Author(s):  
Yajun Chen ◽  
Xuechun Pan ◽  
Changtian Zhang ◽  
Zifan Cui ◽  
Chunming Ji
Keyword(s):  
Fatigue Performance ◽  
Thin Sheets ◽  
Foreign Object ◽  
Impact Mode

Effects of hole reaming on fatigue performance of thin sheets for fuselage: DIC and FEM analysis

2020 ◽  
Vol 141 ◽  
pp. 105893
Author(s):  
Yajun Chen ◽  
Jinchuan Yang ◽  
Changtian Zhang ◽  
Fusheng Wang ◽  
Chunming Ji
Keyword(s):  
Fem Analysis ◽  
Fatigue Performance ◽  
Thin Sheets

Comparison of Acrylamide and Agar Gels by Freeze-Etching

1977 ◽  
Vol 35 ◽  
pp. 606-607
Author(s):  
Russell L. Steere ◽  
Eric F. Erbe
Keyword(s):  
Electron Microscope ◽  
Sodium Hydroxide ◽  
Sodium Hypochlorite ◽  
Chromic Acid ◽  
Distilled Water ◽  
Thin Sheets ◽  
Acid Cleaning ◽  
Agar Gels ◽  
Freeze Etching ◽  
Water Cut

Thin sheets of acrylamide and agar gels of different concentrations were prepared and washed in distilled water, cut into pieces of appropriate size to fit into complementary freeze-etch specimen holders (1) and rapidly frozen. Freeze-etching was accomplished in a modified Denton DFE-2 freeze-etch unit on a DV-503 vacuum evaporator.* All samples were etched for 10 min. at -98°C then re-cooled to -150°C for deposition of Pt-C shadow- and C replica-films. Acrylamide gels were dissolved in Chlorox (5.251 sodium hypochlorite) containing 101 sodium hydroxide, whereas agar gels dissolved rapidly in the commonly used chromic acid cleaning solutions. Replicas were picked up on grids with thin Foimvar support films and stereo electron micrographs were obtained with a JEM-100 B electron microscope equipped with a 60° goniometer stage.Characteristic differences between gels of different concentrations (Figs. 1 and 2) were sufficiently pronounced to convince us that the structures observed are real and not the result of freezing artifacts.

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