From 08/21/2014 through 5/29/2012
Characterization of flaws in composites identified by thermography
Thermography has been used to locate material characteristic flaws in articles including articles made of composite materials. Composite materials include both polymers and ceramics. Thermography has been used to show flaws appearing in composites via their characteristic time-temperature contrast signatures obtained with infrared thermography. Thermography has been used to locate the flaws that alter the flow of heat but did not identify what types of material characteristic flaws were found. Material characteristic flaws in composites typically include porosity and delaminations as contrasted to size, location, and depth of flaws.
What they do not disclose is how to characterize or identify what material characteristic type of flaws were found such as delaminations and porosity. It is desirable to have a nondestructive testing method to find flaws in composite articles and identify what type of material characteristic flaws were found. It is particularly desirable to have a nondestructive testing method to find material characteristic flaws and identify or discriminate between porosity and delaminations.
Ringermacher et al of General Electric, New York, identified types of flaws in a composite by a) rapidly heating the surface of the object; b) recording pixel intensities in a sequence of IR images; c) determining temperature-versus-time data for each of the pixels from the IR images; and d) determining what type of flaw if any corresponds to each of the pixels using the temperature-versus-time data determined in step (c). A contrast curve derived from the temperature-versus-time data may be used in determining what type of flaws if any corresponds to each of the pixels. The contrast curve may be determined by subtracting a synthetic reference curve from a temperature time curve from the temperature-versus-time data. The types of flaws may be determined from size and/or shapes of peaks in the contrast curves. Some flaws are delaminations, layers of porosity, and uniformly distributed porosity. (RDC 4/16/2013)
Thermoplastic resin composition and resin molded article
Nakamura et al of Mitsubishi and Matsumura Sangyo, Japan, developed a thermoplastic materials containing 100 parts by weight of a thermoplastic resin (component A) and 1 to 400 parts by weight of a granular inorganic filler (component B) consisting of a 0.01 to 100 mu,m inorganic filler and a water-soluble polyester resin binder, and having a bulk density of 0.4 to 1.5 g/mL. This material is improved in various properties such as extrusion moldability, rigidity, impact resistance, thermal stability and hue, and exhibits an excellent balance between these properties. (RDC 5/29/2012)
Roger D. Corneliussen
Maro Polymer Links
Tel: 610 363 9920
Fax: 610 363 9921
Copyright 2012 by Roger D. Corneliussen.
No part of this transmission is to be duplicated in any manner or forwarded by electronic mail without the express written permission of Roger D. Corneliussen
** Date of latest addition; date of first entry is 5/24/2012.