Element Analysis Of Crack Closure Research Articles

Finite and boundary element analysis of crack closure

Finite and boundary element analysis of crack closure

Finite element analysis of crack closure in two-dimensional bodies subjected to heating

In order to analyze the crack closure phenomenon evoked by stationary and transient thermal conditions and to investigate its effects on fracture parameters, the finite element method is adopted considering the existence of friction conditions along crack surfaces. Three different states of contact are possible along the crack surfaces: the open, stick and stick state. For each of this state appropriate contact conditions are applied. The problems considered are solved incrementally due to their non-linear nature. Thermal stress intensity factors are evaluated from displacement nodal data using appropriate formulas. Various problems involving edge and central cracks, existing in homogenous or dissimilar materials, being in full or partial closure are studied. Numerical results corresponding to a variety of crack lengths, crack orientations, frictional conditions, thermal conditions are illustrated. Comparison with results from the literature show the high level of accuracy of the proposed method.

Finite element analysis of crack closure in plate bending

The effect of crack closure in plate bending is studied using the finite element method. Elastic plates containing through-wall-thickness stationary cracks under transverse pressure loading are considered with different plate thicknesses and boundary conditions, respectively. Crack closure on the compression side is modeled two different ways: line closure and surface closure models. A plate bending element degenerated from a three-dimensional solid element is used to model such crack closure. Effects of crack closure are compared using the line or surface closure model for different plate thicknesses and boundary conditions, respectively.