The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 15, 1989
Filed:
Oct. 21, 1987
Neal E Tornberg, San Diego, CA (US);
The Expert System Technologies, Inc., San Diego, CA (US);
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.