Effect of Hygrothermal Cycle Aging on the Mechanical Behavior of Single-lap Adhesive Bonded Joints

Abstract

The aging behavior of single lap joints (SLJ) in hygrothermal cycles was investigated and compared by using a shearing strength test, Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TG/DTG), energy dispersive spectrometry (EDS) and scanning electronic microscopy (SEM). The temperature/relative humidity was set at 80 ℃/95% and–40 ℃/30% for 20 cycles, 40 cycles, and 60 cycles (one cycle was 12 hours), respectively. The experimental results show that hygrothermal aging significantly decreases the failure strength of adhesive joints. However, the failure displacement increases as the number of aging cycles increases. In addition, hygrothermal aging changes the failure mode of the adhesive joints from a cohesive fracture in un-aged adhesive layers to an interfacial failure of aged adhesive joints.

Keywords

single lap joints / hygrothermal aging / mechanical behavior / FTIR / TG/DTG / EDS

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