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nature : a component force measuring stress and strain testing methods. One is white with light and shade-intensive parallel lines (grating), the transparent plastic sheet, "Specimen Gate" Grid-adhesive surface of the specimen, in its overlapping one another "base gate," the Grid, when the specimen deformation occurred force, Specimen Gate also will be deformed grating line spacing (also known as the pitch) changed, but at this time there is no baseline grid deformation, resulting moire. Moire and the distribution of specimen deformation is the quantitative relationship between the geometric and draw specimen points strain. Specimen Gate is the gate-line printing particulate film on the film-grid plate; Benchmark gate is generally prints on the glass bottom of the glass plate gate.
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