Print Email Facebook Twitter Fatigue crack surface area and crack front length Title Fatigue crack surface area and crack front length: New ways to look at fatigue crack growth Author van Kuijk, J.J.A. (TU Delft Structural Integrity & Composites) Alderliesten, R.C. (TU Delft Structural Integrity & Composites) Benedictus, R. (TU Delft Aerospace Structures & Materials; TU Delft Structural Integrity & Composites) Department Aerospace Structures & Materials Date 2018-05-25 Abstract This paper discusses the appropriateness of crack length as a reference dimension for fatigue damage. Current discussion on short crack versus long crack data is still divided between various approaches to model small crack growth. A proper physical explanation of the probable cause of the apparent differences between short crack and long crack data is not yet provided. Long crack data often comprises crack growth in constant thickness specimens, with a through crack of near constant crack front geometry. This is not true for corner cracks or elliptical surface crack geometries in the small crack regime where the crack front geometry is not symmetric or through-thickness. This affects similitude parameters that are based on the crack length. The hypothesis in this paper is that a comparison between long crack data and short crack data should be made using similar increments in crack surface area. The work applied to the specimen is dissipated in generation of fracture surface, whereas fracture length is a result. The crack surface area approach includes the two-dimensional effect of crack growth geometry in the small crack regime. A corner crack and a through crack are shown to follow the same power law relationship when using the crack area as base parameter. The crack front length is not constant, and its power law behaviour for a corner crack is shown. To reference this document use: http://resolver.tudelft.nl/uuid:f3386955-628d-4131-b3d0-37613a47879f DOI https://doi.org/10.1051/matecconf/201816513009 ISSN 2261-236X Source MATEC Web of Conferences, 165 Part of collection Institutional Repository Document type journal article Rights © 2018 J.J.A. van Kuijk, R.C. Alderliesten, R. Benedictus Files PDF matecconf_fatigue2018_13009.pdf 1.47 MB Close viewer /islandora/object/uuid:f3386955-628d-4131-b3d0-37613a47879f/datastream/OBJ/view