A numerically efficient approach for the prediction of consecutive growth of delaminations with curved fronts is developed. The approach is based on the assumption that the delamination grows from its current front to a predefined advanced front and that the delamination front remains smooth during the entire growth process. For computation of the load required to propagate the delamination the...

Ultrasonic damage detection and characterization is commonly used in nondestructive evaluation (NDE) of aerospace composite components. In recent years there has been an increased development of guided wave based methods. In real materials and structures, these dispersive waves result in complicated behavior in the presence of complex damage scenarios. Model-based characterization methods utili...

The demand for an insert on composite sandwich structures to aid in the arrestment of face-core delamination is of great need. This research studies the use of a damage arrestment device (DAD) that connects the carbon fiber face sheets to the foam core to find whether an increase in the structural integrity of the sandwich beam results. Experimental analysis was employed to test the samples and...

In this work, an analysis on the influence of fibre-orientation in progression delamination was carried out. The study focused a cracked beam according to End Notch Flexure test configuration. Serial/Parallel Mixing Theory used as composite constitutive law along with continuum damage model simulate delamination. This mathematical approach implemented custom-made FEM code and applied progressio...

Modeling of crashworthy composite structures is limited by the inability of current generations of finite element crash codes to effectively model certain critical failure modes, such as delamination. Previous efforts to model delamination and debonding failure modes using crash codes have typically relied on ad hoc failure criteria and quasistatic fracture data. Improvements to these modeling ...

Impact resistance and damage tolerance remain major concerns in the design of laminated composite structures. Impact on flat panels has been the subject of extensive experimental and theoretical studies [1]. The work on curved panels is more limited although most laminates in aircraft wings and fuselages, as well as in other vehicles, are more or less curved. The existence of a delamination thr...

Both theoretical investigations and successful experimental research were performed recently, confirming the existence and demonstrating the main properties of bulk strain solitary waves in nonlinearly elastic solid wave guides. Our current research is devoted to non-linear wave processes in layered elastic wave guides with inhomogeneities modelling damage/delamination. Here, we present first e...

A continuum damage mechanics (CDM) meso-model was derived for both intraply and interply progressive failure behaviors of a 2D woven-fabric composite laminate under a transversely low velocity impact. An in-plane anisotropic damage constitutive model of a 2D woven composite ply was derived based on CDM within a thermodynamic framework, an elastic constitutive model with damage for the fibre dir...

A damage localization method based on natural frequency was proposed in order to complete the nondestructive diagnosis of a composite plate. The relationship between position and plate studied both qualitatively quantitatively. Furthermore, this paper proved by simulation experimentation, with results showing that can locate where stiffness decreased experiment. Finally, be applied for non-dest...

The mechanical properties of sandwich composites are more depended on the core material structure. Damage commercial honeycomb materials generally occurred as delamination unit-cells under or impact loads. In addition, common feature is their high-cost. Economic approach current researches led studies based principle converting ordinary into advanced materials. Nowadays, development low-cost/hi...