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2 Engineering Transactions

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Numerical analysis of the damage evolution in a composite pipe joint under cyclic static axial tension

100%

Figiel Ł. , Kamiński M.

Engineering Transactions

2003

tom Vol. 51, iss.4

363-379

axial tension with constant amplitude. The approach uses the simplified average shear stress criterion for defect propagation in the adhesive layer and applies the continuum damage mechanics concept to continuum crack-like damage representation in terms of the finite element stiffness. Numerical studies are performed using the commercial Finite Element Method displacement-based ANSYS program, with its special purpose finite element containing birth and death option. Computed damage evolution per a loading cycle leads further to estimation of the cumulative damage growth in terms of a crack-like type for different load amplitude levels. Finally, a numerically determined relation between the applied load amplitude and the load cycles number to failure is derived.

Sensitwity analysis in a fatigue delamination problem of an elastic two-layer composite

80%

Figiel Ł. , Lauke B. , Kamiński M.

Engineering Transactions

2008

tom Vol. 56, iss. 1

65-87

Several parameters can affect the fatigue delamination growth in laminates - these in-clude e.g. constituent material properties and/or composite shape. Knowledge about effects of these parameters can lead to a better understanding of the fatigue delamination behaviour and can also pinpoint directions for optimum composite design. These effects can be elucidated by carrying out an appropriate sensithdty analysis. A FEM-based computational approach to sensitivity analysis is proposed in this work to study composite parameter effects in a fatigue delamination problem of an elastic two-layer composite. It is used to calculate and analyse sen-sitivity gradients of the fracture parameter and fatigue cycle number with respect to composite design parameters such as layer elastic constants. It is observed that sensitivities computed from this approach are generally numerically stable. Obtained sensitivities pinpoint ąuantita-tively the most and least important composite parameters that govern a fatigue delamination process. Sensitivity results are verified by another computational approach and a very good agreement is found.