Overlapped test specimen fixture

An overlapped test specimen fixture operates as a template to precisely position pairs of standardized coupons in predetermined overlapped relation to demarcate standardized bonding sites for application of adhesive systems to be tested. The fixture includes a caul plate bounded by an integral, elevated shoulder having opposed sidewalls and endwalls. The exposed surface is configured as a bi-level, flat support surface having upper and lower surfaces that support the coupons in overlapping relation. The opposed sidewalls are operative to precisely position overlapped coupons lengthwise wherein such coupons demarcate a predetermined overlap length. The fixture also includes locator rails extending upwardly from support surfaces which are operative to precisely position the overlapped coupons transversely. The precisely positioned, overlapped coupons define standardized bonding sites for application of the adhesive system to form a test specimen. Securing members are utilized to temporarily secure test specimens in immobile combination with the support surfaces. The fixture may be used to cure test specimens in room temperature, oven, or autoclave environments. For autoclave use, the upper edges of the elevated shoulder are configured for sealing with vacuum bagging material that envelops the test specimens secured to the support surfaces. The fixture further includes a continuous vent channel formed in the support surfaces to facilitate, evacuation of the fixture and a port formed in one endwall that is configured to fluidically connect the vacuum source to the continuous vent channel wherein a vacuum may be drawn about test specimens enveloped by vacuum bagging material.