Abstract
Abstract Mixed mode static and cyclic crack initiation and crack path are investigated experimentally in 2024-T3 Al-Alloy sheets by using a centre oblique cracked panel geometry under uniaxial loading. The cyclic crack path trajectory is traced and the path of crack growth in the pre-instability region of static loading is also determined. The crack path is also predicted by using different theoretical criteria for the mixed mode, i.e. maximum tangential stress (MTS), strain energy density (SED), maximum tangential strain (MTSN), etc. The nominal fracture stress ratio ( σ I β /σ f 90 ) is compared with the predicted values. The elastic-plastic approaches, J- integral and crack tip opening displacement (CTOD) have been employed to deal with the extensive plasticity associated with crack growth, particularly during static loading. The mechanism of static and cyclic crack growth has been investigated using a scanning electron microscope. The difference between static and cyclic crack growth behaviour has been discussed in the light of the above observations.
Published Version
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