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01219 Multiple Crack Initiation and Propagation Behavior of Stainless Steel in High Temperature Water Environment and Examination by a Simulation

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Product Number: 51300-01219-SG
ISBN: 01219 2001 CP
Author: Masayuki Kamaya, Goro Chiba, Nobuo Nakajima, Nobuo Totsuka
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Environmentally assisted crack initiation is greatly affected by environmental factors, such as applied stress, water temperature, contained impurities and so on. On the other hand, crack initiation behavior also has an influence on crack propagation. A typical example of this influence can be observed as the interference effects of multiple cracks, such as the coalescence of approaching crack tips or the arrest phenomena in the relaxation zone of an adjacent crack. To understand influence of crack initiation on crack propagation behavior is very important to predict the lifetime of components, which tend to accumulate quite a few cracks. This study was aimed at revealing the crack initiation behavior and the influence of this behavior on propagation. At first, to evaluate the effect of stress environment on crack initiation behavior, sensitized stainless steel was subjected to four-point bending tests in a high temperature water environment at the constant potentials of +50mV SHE and +150mV SHE. Secondly, a crack initiation and growth simulation model was developed, in which the interference effect of multiple cracks is evaluated by the finite element method, based on the experimental results. Using this model, the relationship between crack initiation and propagation was studied. Finally, it was revealed that increasing number of the cracks accelerates crack propagation and reduces component life. Keywords: crack initiation, environmentally assisted cracking, stainless steel, finite element method, crack growth simulation.
Environmentally assisted crack initiation is greatly affected by environmental factors, such as applied stress, water temperature, contained impurities and so on. On the other hand, crack initiation behavior also has an influence on crack propagation. A typical example of this influence can be observed as the interference effects of multiple cracks, such as the coalescence of approaching crack tips or the arrest phenomena in the relaxation zone of an adjacent crack. To understand influence of crack initiation on crack propagation behavior is very important to predict the lifetime of components, which tend to accumulate quite a few cracks. This study was aimed at revealing the crack initiation behavior and the influence of this behavior on propagation. At first, to evaluate the effect of stress environment on crack initiation behavior, sensitized stainless steel was subjected to four-point bending tests in a high temperature water environment at the constant potentials of +50mV SHE and +150mV SHE. Secondly, a crack initiation and growth simulation model was developed, in which the interference effect of multiple cracks is evaluated by the finite element method, based on the experimental results. Using this model, the relationship between crack initiation and propagation was studied. Finally, it was revealed that increasing number of the cracks accelerates crack propagation and reduces component life. Keywords: crack initiation, environmentally assisted cracking, stainless steel, finite element method, crack growth simulation.
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