Time-temperature resistance of transverse stressed lap joints of glued spruce and thermal analysis of adhesives

Lap joints were prepared by gluing spruce plates with three types of adhesives (phenol-resorcinol-formaldehyde, PRF; one-component polyurethane, PUR; and epoxy, EP). The joints were exposed to 140 °C and 170 °C for 24 h (20, 40, 60, 80, 180 and 1140 min) and then loaded in four-point bending to veri...

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