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Method for tensile testing thin-film materials and glass fiber laminates

IP.com Disclosure Number: IPCOM000101700D
Publication Date: 2005-Mar-16
Document File: 8 page(s) / 765K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method for tensile testing thin-film materials and glass fiber laminates. Benefits include improved functionality, an improved manufacturing environment, and an improved test environment.

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Method for tensile testing thin-film materials and glass fiber laminates

Disclosed is a method for tensile testing thin-film materials and glass fiber laminates. Benefits include improved functionality, an improved manufacturing environment, and an improved test environment.

Background

              Conventionally, a repeatable solution is required that obtains mechanical strength, ductility, and Young’s modulus data on thin-film materials, thin-film impregnated specimens, and paper-thin (single layer) fiberglass-laminate specimens. Metrology and processing eliminate the abrasive forces that cut or damage the individual fibers of the fiberglass laminate at the grips interface. Metrology and processing consistently control the gauge length and accurately measure material deformation under load without slippage.

              Fiberglass laminates are defined as a cut-out section of a fully weaved, resin-treated sheet of glass-fiber material. A thin-film is any layer of material grown using any of the basic deposition techniques, such as physical vapor deposition (PVD), chemical vapor deposition (CVD), and other chemical methods.

              No conventional metrology exists for measuring the tensile strength or Young’s modulus of thin-films and fiberglass single-layer laminates.Several solutions have been applied on a case-by-case basis when laminates are tested under tension, using microtester machines. As a result, no reliable method exists for internally testing laminates and providing data to the modeling teams.

General description

              The disclosed method is a metrology and process for the assembly and uni-axial tensile testing of thin-film laminates and multilayer FR4 fiber sheets and laminates. Paper-thin fiberglass and thin-film layer samples are tested for yield strength to obtain modulus values and ultimate strength and ductility characteristics under uni-axial tensile loads.

              An assembly is comprised of an aluminum base plate with slots and cavities, duplicating the geometry of a fixture. It enables the assembly of a fiberglass laminate on a loading fixture in a fully extended, zero axial-load condition. The method tests the sample in a uni-axial test condition, using the tensile tester.

Advantages

              The disclosed method provides advantages, including:
•             Improved functionality due to providing the quick assessment of thin-films, FR4 or similar thin-laminate strength properties

•             Improved functionality due to providing a consistent technique for characterizing mechanical properties in the longitudinal (x-direction) and transverse (y-direction) directions

•             Improved functionality due to providing an assembled fixture that applies evenly distributed pressure on the flat aluminum T-sections, exerting a uniform gripping pressure on the fiber laminate sandwiched between the two T-plates without yielding or cutting the individual fibers of the laminate or thin-film

•             Improv...