Method of establishing standard composite material properties

Details Method of establishing standard composite material properties Method of establishing standard composite material properties

1987-10-21

1989-08-15

Levy, Stewart J.

Measuring and testing

Vibration

By mechanical waves

73818, G01N 2900

Patent

active

048563358

ABSTRACT:
A standard reference deformation of a composite material containing a flowable phase and compressible inclusions, such as a prepreg, is measured as the deformation whereat the dominant compressive mode of composite deformation changes from that characteristic of compressible inclusion collapse to that characteristic of resin flow, termed the optimal consolidation deformation. Establishment of this point permits measurement and correlation of physically significant composite properties. For example, material properties of such composite materials are measured under a compressive loading by an ultrasonic transducer at the optimal consolidation deformation. At this point, normally determined to be the deformation at which the second derivative of compressive displacement falls to about zero, compressible inclusions such as voids are eliminated but the flowable phase has not yet begun to flow significantly so as to change the fractions of the phases. This technique is particularly valuable in ultrasonically measuring properties such as phase fractions of resin matrix prepreg materials wherein the resin has not been cured and readily flows, and wherein there are typically voids that interfere with the measurement of properties.

REFERENCES:
patent: 3504532 (1970-04-01), Muenow et al.
patent: 3715709 (1973-02-01), Zacharias, Jr. et al.
patent: 3786676 (1974-01-01), Korolyshun et al.
patent: 3995501 (1976-12-01), Wiley
patent: 4616508 (1986-10-01), Jorn
patent: 4754645 (1988-07-01), Piche et al.

Affiliated with

Also associated with

Rating

Method of establishing standard composite material properties does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method of establishing standard composite material properties, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of establishing standard composite material properties will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-113636