... = nx - ny = R/t = m?/t Where, R = optical path difference and t= sample thickness. ? is the wave length corresponding to specific colored fringes (for red fringe, ?= 550nm) and m is an integer indicating the fringe order ( m= 0 for the black fringe and m = 1,2,3,4,.......etc) for each successive red fringe. Thickness of each sample = 3mm. Hold-on Pressure (bar) (m)Red Fringe Order (R) optical path difference ??n= R/t 10 1 10 3.33 2 23 7.67 3 56 18.67 4 92 30.67 Pressure (bar) (m)Red Fringe Order (R) optical path difference ??n= R/t 30 1 2 0.7 2 8 2.7 3 32 10.7 4 54 18.0 5 87 29.0 Pressure (bar) (m)Red Fringe Order (R) optical path difference ??n= R/t 60 1 3 1.0 2 14 4.7 3 33 33.0 4 52 17.3 5 67 22.3 6 92 30.7 7 113 37.7 Inj. Speed (%) (m)Red Fringe Order (R) optical path difference ??n= R/t 30 1 11 3.67 2 27 9 3 44 14.67 4 54 18 5 72 24 6 100 33.33 Inj. Speed (%) (m)Red Fringe Order (R) optical path difference ??n= R/t 60 1 3 1 2 13 4.33 3 38 12.67 4 61 20.33 Inj. Speed (%) (m)Red Fringe Order (R) optical path difference ??n= R/t 90 1 3 1 2 22 7.33 3 65 21.67 Discussion * According to the above table (A) it is found that the mould was fully filled at injection Stroke of 85 mm and the shot size was 46.56 gm. * In practical determination of hold-on time, it is found that the component filled in ...

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