Abstract: The invention relates to a test device for simultaneously exposing a disk-shaped test specimen to a flowing and pressurized test gas and mechanical load as well as an associated test method. The test device is comprised of the following components: a specimen seat, which is designed in such a way that an edge area of the test specimen rests on the specimen seat and an inner area of the test specimen is accessible from its upper side and lower side; a ram arranged above the specimen seat, with which a presettable mechanical load can be exerted on the upper side of the test specimen; and a gas feed plate arranged beneath the specimen seat, with which the test gas can be conveyed to the lower side of the test specimen.