Fatigue crack growth in micro specimens as a tool to measure crack–microstructure interactions

Grünewald, Patrick; Rauber, Jonas; Marx, Michael; Schaefer, Florian

doi:10.1111/ffe.13354

Cited by 8 publications

(4 citation statements)

References 23 publications

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“…Such a behavior is often linked with the transition to macroscopic crack growth (stage II) [55]. Indeed, this transition occurs at shorter absolute crack length in miniaturized specimen [56]. Another explanation could be crack interaction with interfaces or redirection towards stress concentrations that reside subsurface.…”

Section: Cyclic Damage Evolutionmentioning

confidence: 99%

Efficient Experimental and Data-Centered Workflow for Microstructure-Based Fatigue Data

et al. 2021

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Background Early fatigue mechanisms for various materials are yet to be unveiled for the (very) high-cycle fatigue (VHCF) regime. This can be ascribed to a lack of available data capturing initial fatigue damage evolution, which continues to adversely affect data scientists and computational modeling experts attempting to derive microstructural dependencies from small sample size data and incomplete feature representations. Objective The aim of this work is to address this lack and to drive the digital transformation of materials such that future virtual component design can be rendered more reliable and more efficient. Achieving this relies on fatigue models that comprehensively capture all relevant dependencies. Methods To this end, this work proposes a combined experimental and data post-processing workflow to establish multimodal fatigue crack initiation and propagation data sets efficiently. It evolves around fatigue testing of mesoscale specimens to increase damage detection sensitivity, data fusion through multimodal registration to address data heterogeneity, and image-based data-driven damage localization. Results A workflow with a high degree of automation is established, that links large distortion-corrected microstructure data with damage localization and evolution kinetics. The workflow enables cycling up to the VHCF regime in comparatively short time spans, while maintaining unprecedented time resolution of damage evolution. Resulting data sets capture the interaction of damage with microstructural features and hold the potential to unravel a mechanistic understanding. Conclusions The proposed workflow lays the foundation for future data mining and data-driven modeling of microstructural fatigue by providing statistically meaningful data sets extendable to a wide range of materials.

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Section: Cyclic Damage Evolutionmentioning

confidence: 99%

Efficient Experimental and Data-Centered Workflow for Microstructure-Based Fatigue Data

et al. 2021

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“…The product delivers the expected functionality for the majority of its useful life, without any noticeable changes on the macro scale. But if we look closer, on the scale of crystals and grain boundaries, microcracks emerge, join, coalesce and grow [1,2]. When microcracks reach a human-noticeable length scale, e.g., 1 mm, we refer to them as macrocracks.…”

Section: Introductionmentioning

confidence: 99%

Yet Another Approach to Fatigue Crack Growth Simulation

Zobec

Klemenc

2022

Metals

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The analysis of a material that is subjected to variable loads is a complex subject and generally treated separately by fatigue and fracture mechanics. We present an attempt to extend the validity of conventional fatigue approach (here strain-life) in the scope fracture. This was achieved by introducing a zero thickness cohesive contact element coupled with a damage parameter that was developed from material observations of strain controlled fatigue experiments. The presented simulation framework results in a predictable crack growth direction on a compact tension specimen, although further experimentation is needed to validate the proposed approach.

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“…7 On another scale, since the process of short fatigue crack growth plays a significant role for the lifetime of materials in the high and very high cycle regimes, the high impact of crack-microstructure interactions on fatigue crack growth is measured using micro specimens. 8 The Guest Editors of the present Virtual Special Issue are grateful to the authors and the reviewers of the published papers; their support and dedication in carefully writing and revising the scientific content of the selected works was the key of the success for this VSI. The Guest Editors want also to acknowledge the continuous support of the Editor in Chief of FFEMS Prof. Youshi Hong and of Wiley editorial team.…”

mentioning

confidence: 95%

“…An experimental study, supported by digital image correlation (DIC), in which a half‐scale steel girder to cross frame subassembly was subjected to distortion‐induced fatigue loading to produce multiple geometrically complex cracks, is presented 7 . On another scale, since the process of short fatigue crack growth plays a significant role for the lifetime of materials in the high and very high cycle regimes, the high impact of crack–microstructure interactions on fatigue crack growth is measured using micro specimens 8 …”

mentioning

confidence: 99%