Fatigue Crack Growth And Interactions
Author(s)
P. Brož
Abstract
An algorithm to model 2D crack growth is given. The stepwise technique on the
pattern of local criteria of growth is employed, together with two propagation
criteria. At the first phase of growth, the maximum tension stress gauge is used
to consider the sudden variation in tangent course, and at ensuing stages, the
supposition that the stress intensity factor K2 = 0 at the current crack tip is
utilized. Further, to investigate the interactions of a fatigue crack and a microdefect
such as a void, a rigid inclusion or a transformation one, the mixed
boundary integral equation method is applied. The pseudo-tractions technique is
used to study the influence of a transformation inclusion. An element
incorporating the mixed-mode stress intensity factors is employed to describe the
singularity at a moving crack tip. The analysis of a crack issuing from a circular
hole in a finite plate is presented.
Keywords: angle of deviation, displacement discontinuities, inclusion, microdefect,
round arc.
1 Introduction
In the main, the work tackling numerical simulation uses the stepwise procedure
to model crack growth. Concurrently, the crack path is taken into account to be a
sequence of small steps. At each step of propagation, the crack is extended from
the previous tip by a length increment δl in some course that may be determined
from the growth criterion chosen. The criterion of maximum tensile stress was
used as a matter of priority. The SIFs encompassed in this criterion are specified
by dint of boundary element or finite element methods. This conception results
in the crack path that looks like a jigsaw line, in defiance of the expectation of a
smooth crack path. To arrange a smooth path, the only stepwise algorithm was
proposed. It is based on the use of maximum tensile stress criteria. In compliance
Keywords
angle of deviation, displacement discontinuities, inclusion, microdefect,
round arc
Related Book
Other papers in this volume
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