Finite Element Analysis Of Plasticity-induced
Fatigue Crack Closure Using Contact Elements
Author(s)
M. G. Gökçen & V. Kalenderoğlu
Abstract
To predict crack opening stresses, contact elements are incorporated into the
elastic-plastic finite element analysis of fatigue crack closure. A code using
ANSYS Parametric Design Language (APDL) is developed. In spite of the fact
that the use of contact elements in modelling crack surface contact and crack
closure is inherently natural, efforts to incorporate them in the finite element
analysis of crack closure are not widespread. The traditional method of
modelling crack closure is based on placing truss elements at the crack surface
nodes. In the present research, contact elements are used to model crack surface
contact. While the load is applied incrementally, crack opening stress is
determined by monitoring the state of the contact elements. The results of
two-dimensional plane strain finite element analyses are in good agreement with
previous work reported in the literature. Instead of finding crack opening stress
at every load cycle, an algorithm to find crack opening stress at predetermined
load cycle intervals is developed. With the developed algorithm it was possible
to analyze crack closure behaviour during a larger number of load cycles with
less execution time. The algorithm that is implemented is parametrically
analysed. The effect of load increment is investigated. Since crack opening stress
is not evaluated at every cycle, the effect of how often opening stresses are
determined is another issue that is investigated. As a result of the simulation with
a relatively high number of cycles, it was possible to observe the final
stabilization in the crack opening stress values that follows a decay after the
initial plateau.
Keywords: fatigue crack closure, plasticity induced closure, finite element
analysis, contact elements.
Keywords
fatigue crack closure, plasticity induced closure, finite element
analysis, contact elements
Related Book
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