TY - JOUR
T1 - Mixed mode fracture properties of GFRP-adhesive interfaces based on video gauge and acoustic emission measurements from specimens with adherend fibres normal to the interfaces
AU - Sun, Wei
AU - Sebastian, Wendel
AU - Keller, Thomas
AU - Ross, Joel
PY - 2017/8/15
Y1 - 2017/8/15
N2 - Mixed-mode bending tests were performed on fifty-three GFRP-adhesive-GFRP specimens. In each specimen the pre-crack was located near the GFRP adherend with fibres normal to the GFRP-adhesive interface, so as to encourage crack propagation along this interface rather than through the GFRP. The other GFRP adherend contained fibres parallel to the interface, leading to asymmetry of GFRP material (but not of specimen geometry) with respect to the adhesive layer in each specimen. This switching, across the adhesive layer, between normal and parallel fibres in the adherends, reflects a T-joint detail considered for a wave energy device. All tests used a video gauge system to measure crack propagation. Some tests also employed an acoustic emission (AE) system. Comparisons between the AE results and the video gauge-based crack propagation data strongly suggest that the AE energy vs time curve is a much clearer indication of crack initiation than is the widely used AE hit count vs time curve. Increase in Mode II ratio during the tests led to fewer but larger post-peak load drops. Williams's approach, based on beam theory for asymmetric sections with correction factors for large displacements and shear deformation included, led to fracture toughness (GC) values in the range 0.3–2.8 kJ/m2, with a trend of increasing GC values as pure Mode II is approached. The ASTM approach, developed only for symmetric specimens, gave much lower GC values.
AB - Mixed-mode bending tests were performed on fifty-three GFRP-adhesive-GFRP specimens. In each specimen the pre-crack was located near the GFRP adherend with fibres normal to the GFRP-adhesive interface, so as to encourage crack propagation along this interface rather than through the GFRP. The other GFRP adherend contained fibres parallel to the interface, leading to asymmetry of GFRP material (but not of specimen geometry) with respect to the adhesive layer in each specimen. This switching, across the adhesive layer, between normal and parallel fibres in the adherends, reflects a T-joint detail considered for a wave energy device. All tests used a video gauge system to measure crack propagation. Some tests also employed an acoustic emission (AE) system. Comparisons between the AE results and the video gauge-based crack propagation data strongly suggest that the AE energy vs time curve is a much clearer indication of crack initiation than is the widely used AE hit count vs time curve. Increase in Mode II ratio during the tests led to fewer but larger post-peak load drops. Williams's approach, based on beam theory for asymmetric sections with correction factors for large displacements and shear deformation included, led to fracture toughness (GC) values in the range 0.3–2.8 kJ/m2, with a trend of increasing GC values as pure Mode II is approached. The ASTM approach, developed only for symmetric specimens, gave much lower GC values.
KW - Glass fibres
KW - Resins
KW - Fracture toughness
KW - Acoustic emission
KW - Mechanical testing
UR - http://www.scopus.com/inward/record.url?scp=85019982751&partnerID=8YFLogxK
U2 - 10.1016/j.compositesb.2017.05.001
DO - 10.1016/j.compositesb.2017.05.001
M3 - Article (Academic Journal)
SN - 1359-8368
VL - 123
SP - 179
EP - 192
JO - Composites Part B: Engineering
JF - Composites Part B: Engineering
ER -