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The effects of hybridization between woven mengkuang fiber/woven silk on mode II delamination (GIIC) of laminated composites were investigated by performing the end-notched flexure (ENF) test. Various configurations of woven mengkuang/woven silk layers were considered. The composite samples were prepared using hand lay-up, along with the cold press method. After fabrication, the test specimens were subjected to end-notch flexure testing for mode II delamination based on ASTM D790-03. During the test, the crack propagation was observed; the sudden drop in load meant that the sample experienced crack growth. The configuration of woven silk in between the pre-crack provided an excellent improvement in G IIC . Further addition of woven silk layers for similar configuration also yielded significant improvements in the G IIC  result. The rate of critical strain energy release increases with an increase in number of woven silk layers for the configuration of silk in between the pre-crack. The scanning electronic microscopy (SEM) result shows the cross-section of the samples. The study also demonstrated that surface interaction between woven silk/epoxy/woven silk was better than woven mengkuang/epoxy/woven mengkuang lamination.

Mode II delamination of woven mengkuang fiber/woven silk laminated hybrid composites