Nondestructive determination of phase fractions of composite mat

Details Nondestructive determination of phase fractions of composite mat Nondestructive determination of phase fractions of composite mat

1990-04-25

1992-12-08

Lall, Parshotam S.

Boots, shoes, and leggings

73597, 36457102, G06F 1520

Patent

active

051703670

ABSTRACT:
The fractions of the phases of a composite material are determined utilizing a calibration relationship between at least one nondestructively measured quantity and a destructively measured phase fraction. The proper calibration relationship is selected from a multiple-variable regression relation, a single-variable regression of a product of two measured quantities, one of two single-variable regressions, or a weighted average of the results of two single-variable regressions, all four approaches utilizing nondestructive measurements of specimen consolidated height and specimen consolidated ultrasonic transit time. When prepreg material having uniaxial fibers is analyzed, multiple-layer specimens are formed by stacking the individual plies so that the fiber directions in adjacent layers are not parallel.

REFERENCES:
patent: 4794545 (1988-12-01), Salvado
patent: 4856335 (1989-08-01), Tornberg
patent: 4961346 (1990-10-01), Salvado et al.
N. R. Draper et al., "Applied Regression Analysis", 1966, John Wiley & Son, pp. 313-325.
Arthur E. Hoerl et al., "Ridge Regression: Biased Estimation for Nonorthogonal Problems," Technometrics, vol. 12, pp. 55-67 (1970).
Arthur E. Hoerl et al., "Ridge Regression: Applications to Nonorthogonal Problems", Technometrics, vol. 12, pp. 69-82 (1970).

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