Experimental characterization of microscopic failure process under quasi-static tension in interleaved and toughness-improved CFRP cross-ply laminates

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Abstract

The microscopic failure process in CFRP cross-ply laminates under quasi-static tensile loading has been investigated at ambient temperature and 80 °C. Material systems considered were interleaved T800H/3631-FM300 and toughness-improved T800H/3900-2 with selectively toughened interlaminar layers. In situ observation of the microscopic failure process was conducted by using an optical microscope (OM) and a scanning acoustic microscope (SAM) with an ‘instrumented tensile loading device’ together with the replication technique. The transverse crack density was measured as a function of the applied laminate strain. On the basis of the above data, a variational stress analysis and a probabilistic approach were used to calculate the transverse crack density as a function of laminate strain. Failure mechanisms after transverse cracking were also discussed.

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