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Local approach contributions into the global view of the mechanical crack-tip environment formulation

Katz Y., Tymiak N., Gerberich W. W.

Journal of Achievements in Materials and Manufacturing Engineering

2007

Vol. 24, nr 1

162-165

Purpose: Physically based understanding, associate fracture processes to local origins. Even so, in elastic-plastic solids the continuum analysis is mainly engaged with the macroscopic scale. Beside global views the current study emphasise the coupled aspects that are determined by local and material-based factors. Design/methodology/approach: Theoretical/experimental interfaces were adopted mainly cantered on interaction problems. Load interaction in static or dynamic loading and deformation/environment interactions were selected. For the load interaction cases, construction materials were investigated. A metastable stainless steel and hydrogen represented the environment interaction case. Experimentally, novel techniques have been utilized mainly on the nano scale including contact methodology and probe microscope visualization. Findings: The macroscopic background that was supplemented by local findings enabled to refine viable models in quantitative terms. Research limitations/implications: The nano mechanical approach allows additional options to be taken in terms of critical experiments or in order to improve multi-scale models. Originality/value: The nowadays contribution by small volume activities as related to complicated technological topics are highly promising. These avenues are only in early stages, with increasing incentives to advance capabilities assisting applications in nano technology.

The dynamic nature of hydrogen assisting crack extension

Katz Y., Tymiak N., Gerberich W. W.

Journal of Achievements in Materials and Manufacturing Engineering

2006

Vol. 18, nr 1-2

123--126

Purpose: Purpose of this paper to develop new avenues into the understanding of hydrogen/deformation interactions Design/methodology/approach: Metastable stainless steel mainly polycrystalline FCC system was selected. The interactive fracture problems enjoyed the assistance of fracture mechanics theory and methodology. Regarding hydrogen embrittlment the study leans towards generic hydrogen enhanced decohesion model allowing quantitative engagement with experiments. Mechanical response was tracked by contact mechanics methodology. Nano indentation beside continues scratch tests have been supplemented by visualization and measurements utilizing Scanning Probe Microscopy (SPM). Findings: It was shown that hydrogen increased the load onsets for dislocations nucleation in metastable austenitic stainless steel by at least a factor of two, whereupon the yield point recovered after hydrogen outgases. Plasticity localization due to hydrogen was also substantiated. Research limitations/implications: The nano mechanical approach allowed additional critical experiment of hydrogen/deformation affects to be programmed. Originality/value: Fracture is a localized phenomenon and the fine scale features information on high resolution observations opened potential contribution by exploring small volume research activities.