The following images depict the microscopic fracture pattern analysis of the samples from test series two, which underwent various surface pre-treatments: PP-AC, PP-LT, PP-SB, LT-AC, LT-LT, LT-SB, SB-AC, SB-LT and SB-SB. The thickness of both samples was 2 mm.
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Fracture pattern analysis using a white-light microscope for the screwed samples. This section contains the fracture images from the bolted tests. There were two test series. The first test series investigated the influence of the overlap length on the tensile shear strength of the bolted connection, while the second investigated the influence of the hole diameter on the tensile shear strength of the bolted connection.