Electron beam moiré

1993 ◽  
Vol 33 (4) ◽  
pp. 270-277 ◽  
Author(s):  
J. W. Dally ◽  
D. T. Read
Keyword(s):  
Electron Beam ◽  
Electron Beam Moiré

Measurement of electron beam moire fringes with pulsed-dilation framing camera using different lasers

Optik ◽  
2019 ◽  
Vol 195 ◽  
pp. 163149
Author(s):  
Yanli Bai ◽  
Rongbin Yao ◽  
Haiying Gao ◽  
Xun Wang ◽  
Dajian Liu
Keyword(s):  
Electron Beam ◽  
Moiré Fringes ◽  
Framing Camera ◽  
Electron Beam Moiré

Analysis of an extraordinary electron beam moiré phenomena in a pulse-dilation framing camera

Optik ◽  
2019 ◽  
Vol 199 ◽  
pp. 163516
Author(s):  
Yanli Bai ◽  
Rongbin Yao ◽  
Haiying Gao ◽  
Xun Wang ◽  
Dajian Liu
Keyword(s):  
Electron Beam ◽  
Framing Camera ◽  
Electron Beam Moiré

Electron Beam Moire´ Study of Fracture of a Glass Fiber Reinforced Plastic Composite

1994 ◽  
Vol 61 (2) ◽  
pp. 402-409 ◽  
Author(s):  
D. T. Read ◽  
J. W. Dally
Keyword(s):  
Electron Beam ◽  
Glass Fiber ◽  
Local Strains ◽  
Glass Fiber Reinforced Plastic ◽  
Fiber Reinforced Plastic ◽  
Plastic Composite ◽  
Glass Fiber Reinforced ◽  
Reinforced Plastic ◽  
Fringe Patterns ◽  
Electron Beam Moiré

Using the method of electron beam moire´, a small region at an interface of a [O2/ 90]s glass fiber reinforced plastic composite has been examined during tensile testing. The tensile test was conducted inside a scanning electron microscope, with a high spatial frequency line grating (10,000 lines/mm) at the interface between a longitudinal ply and a transverse ply. During the test, this region was observed at a magnification of 1900 × . Local strain measurements were made by interpreting the moire´ fringe patterns over gage lengths that varied from 10 to 30 μm. The magnitude and distribution of the local strains depended on the damage that occurred with monotonically increasing load. Load shedding by the transverse ply was evident from the fringe patterns. Extremely high local strains were observed: longitudinal fiber strains up to three percent, normal strains up to three percent, and shear strains up to 40 percent in the epoxy matrix.

Observation of electron beam moiré fringes in an image conversion tube

2016 ◽  
Vol 170 ◽  
pp. 19-23 ◽  
Author(s):  
Yunfei Lei ◽  
Yubo Liao ◽  
Jing-hua Long ◽  
Houzhi Cai ◽  
Yanli Bai ◽  
...  
Keyword(s):  
Electron Beam ◽  
Image Conversion ◽  
Moiré Fringes ◽  
Electron Beam Moiré

Mechanical Deformation in Conductive Adhesives as Measured With Electron-Beam Moire´

1999 ◽  
Vol 121 (2) ◽  
pp. 69-74 ◽  
Author(s):  
E. S. Drexler ◽  
J. R. Berger
Keyword(s):  
Electron Beam ◽  
Mechanical Deformation ◽  
Shear Mode ◽  
Conductive Adhesives ◽  
Additional Loading ◽  
The Matrix ◽  
Film Specimen ◽  
Shear Strains ◽  
Electron Beam Moiré

Two forms (paste and film) of isotropically conductive adhesives (CAs) were mechanically loaded in shear mode. The specimens were instrumented with crossed-line gratings so that normal and shear displacements could be measured. The CA paste specimen failed outside the observed region at a stress 28 percent below the manufacturer’s predicted value. In the observed region there were no normal strains, only shear strains restricted to the CA. In the film specimen the conducting particles began breaking away from the matrix epoxy at very low loads. However, the specimen continued carrying the additional loading increments until the load was transferred to the adjacent material.

Micro-strain distribution around a crack tip by electron beam moiré methods

KSME Journal ◽  
1995 ◽  
Vol 9 (3) ◽  
pp. 298-311 ◽  
Author(s):  
Ouk Sub Lee ◽  
David T. Read
Keyword(s):  
Electron Beam ◽  
Strain Distribution ◽  
Crack Tip ◽  
Electron Beam Moiré
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