Measuring and testing – Specimen stress or strain – or testing by stress or strain... – By loading of specimen
Reexamination Certificate
2006-07-25
2006-07-25
Lefkowitz, Edward (Department: 2855)
Measuring and testing
Specimen stress or strain, or testing by stress or strain...
By loading of specimen
Reexamination Certificate
active
07080561
ABSTRACT:
A test method for visual documentation of micro-cracks during tensile coupon testing includes the steps of: assembling a test unit; inserting a carbon-reinforced composite specimen having a prepared edge into the tensile coupon testing machine; illuminating the prepared edge of the specimen with a camera strobe light and a microscope light; applying a tensile load to the specimen; and capturing images (at 10% increments of the expected failing stress) of the prepared edge of the specimen with a digital camera that is attached to a stereomicroscope. Using the test method of the present invention photographic documentation of the formation and growth of micro-cracks in carbon-reinforced composite materials under tensile load is possible. The obtained data may be used to avoid or limit fatigue failure of carbon-reinforced structures used, for example, in the aerospace industry, for example, in spacecrafts and advanced military aircraft.
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Bohlmann Raymond E.
Hurd Milton D.
Bonanto George P
Lefkowitz Edward
Shimokaji & Associates P.C.
The Boeing Company
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