Latest posts by Markku Palantera (see all)
- ESAComp introduces “through-the-width” debonding/delamination analysis - September 12, 2017
- Structures are not ideal – Challenges of buckling analyses - October 15, 2015
- Nonlinear collapse analysis of a launcher structure with imperfection sensitivity study - March 5, 2015
Delamination is a recognized, major failure mechanisms for composites. The separation of the internal layers within a composite, caused by high through-the-thickness stresses, can arise due to manufacturing defects or from impacts occurring during assembly or whilst in-service. Delamination can reduce considerably the load-carrying capability of the component and may result in significant structural damage or failure, particularly when loaded in compression.
Coming soon in ESAComp 4.7, the new delamination module utilizes various technologies to predict the onset of damage propagation. A geometrically nonlinear analysis approach provides the means to predict the realistic load-deformation-path including various buckling modes.
By utilizing Strain Energy Release Rate (SERR) data, the onset of delamination is predicted using the relevant delamination criteria at the delamination front. The required material input data comprises the fracture toughness, with respect to the three modes, along with the interaction term which is related to the mode mix. For some of the material systems, the ESAComp Database now includes fracture toughness data.