Abstract
A combined numerical-experimental methodology is presented to measure dynamic Mode-I fracture properties of fiber reinforced composites. A modified wedge-DCB test using a Split-Hopkinson Bar technique along with cohesive zone modelling is utilised for this purpose. Three different comparison metrics, namely, strain-displacement response, crack propagation history and crack opening history are employed in order to extract unique values for the cohesive fracture properties of the delaminating interface. More importantly, the complexity of dealing with the frictional effects between the wedge and the DCB specimen is effectively circumvented by utilising right acquisition techniques combined with an inverse numerical modelling procedure. The proposed methodology is applied to extract the high rate interlaminar fracture properties of carbon fiber reinforced epoxy composites and it is further shown that a high level of confidence in the calibrated data can be established by adopting the proposed methodology.
Highlights
Delamination is known to be one of the crucial failure mechanisms in fibre reinforced composites, for structures subjected to impact loads
The inverse modelling procedure discussed above is followed to conduct a series of simulations to identify the best match for the interface properties by using the three metrics
It has been shown that reliable values for the interface properties of the composite can be obtained without taking into account of the frictional effects between the wedge and the DCB arms
Summary
Delamination is known to be one of the crucial failure mechanisms in fibre reinforced composites, for structures subjected to impact loads. Understanding this failure mechanism is important, especially for aerospace structures, where their presence can severely compromise the structural integrity. Designing a composite structure against such a failure mechanism requires the material property (i.e., fracture toughness) of the composite interfaces i.e., the layers between the plies susceptible to delamination. Several experimental studies were conducted to measure the high rate interlaminar fracture toughness using different test approaches that include several DCB-based configurations, compact tension and compression, planar plate impact and edge notched specimens. Some common drawbacks of several test methods are the iner-
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