The primary objective of this work is to demonstrate how the condition for biaxially loaded off-axis tunnelling crack growth can be reproduced in a modified laminate under uniaxial loading. More specifically, laminates with the stacking sequences [0/θ/0/-θ]s and [0/α/0/-α]s have been considered for the biaxial and uniaxial loadings, respectively. A steady-state crack growth condition is analysed for an isolated off-axis tunnelling crack. The crack tip stress state is expressed in terms of a through thickness averaged mode mixity and energy release rate. The presented framework uses an energy accounting method with the crack opening displacements extracted from a finite element analysis. Results shows that the tunnelling crack tip stress state of the modified laminate under uniaxial loading matches with the biaxially loaded laminate. With a modified off-axis lamina orientation and the additional load amplitude from the biaxially loaded laminate, a simplified uniaxial testing laminate can be designed that yields the same biaxial tunnelling crack tip conditions.
|Journal||IOP Conference Series: Materials Science and Engineering|
|Number of pages||8|
|Publication status||Published - 2020|
|Event||41st Risø International Symposium on Materials Science - Online event, Denmark|
Duration: 7 Sep 2020 → 10 Sep 2020
|Conference||41st Risø International Symposium on Materials Science|
|Period||07/09/2020 → 10/09/2020|