Abstract
This paper studies the effect of initial crack location on the face/core debond fracture toughness under different mixed mode loading conditions. The mixed mode loading at the crack tip is defined in terms of the mode-mixity. In order to achieve the desired initial debond crack location, a pre-cracking technique is developed, where the mode-mixity, number of cycles, crack increment and load level are accurately controlled. Results show that the debond fracture resistance of foam-cored sandwich specimens depends on parameters such as loading condition (mode-mixity), core and face properties, as well as initial debond crack location. Lower fracture toughness values were measured for specimens with the initial crack location in the face laminate.
Highlights
The susceptibility to face/core debond propagation is a major concern for many sandwich structures
No in depth analysis regarding the effect of initial crack location on the debond fracture toughness is available, and there is a necessity for further evaluation and understanding concerning this phenomena
For specimens with the crack located in the core, higher fracture toughness values were measured compared to specimen with the crack in the face laminate
Summary
The susceptibility to face/core debond propagation is a major concern for many sandwich structures. It has been shown that the critical fracture energy, GC, (fracture toughness) depends on the mode-mixity at the crack tip, which influences in the resultant fracture crack path of debonded sandwich structures [1]. No in depth analysis regarding the effect of initial crack location on the debond fracture toughness is available, and there is a necessity for further evaluation and understanding concerning this phenomena. This is of crucial importance when performing damage assessments of sandwich structures (wind turbine blades, ships, etc) due to debonds.
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