TY - JOUR

T1 - Analysis of skin-stringer debonding in composite panels through a two-way global-local method

AU - Akterskaia, Margarita

AU - Jansen, Eelco

AU - Hallett, Stephen R.

AU - Weaver, Paul

AU - Rolfes, Raimund

N1 - Funding Information: The research leading to these results has received funding from European Union's Horizon 2020 research and innovation program (FULLCOMP/2015-2019) under Marie Sklodowska-Curie actions grant agreement number 642121. The provided financial support is gratefully acknowledged by the authors.

PY - 2018/10/15

Y1 - 2018/10/15

N2 - According to various experimental results, stiffened panels under compressive loading are prone to debonding between the skin and the flange of the stringer. In this paper, a novel two-way global-local coupling approach is presented that is able to model progressive separation of the skin and stringer in stiffened CFRP panels under compression. The main goal of this methodology is to examine skin-stringer debonding at two levels of accuracy, taking advantage of the fast calculations at the global level and assessing in detail the damage propagation at the local level. First, critical areas are defined in a global model with a standard mesh, and local models with a considerably finer mesh are created by means of a submodeling technique. Secondly, a local model analysis is conducted, in which cohesive elements are applied to simulate debonding. Particularly important is the appropriate information exchange in both directions between the different steps of the coupling analysis. Averaged degraded properties are defined at the local model level and transferred back to the global level. The applied compressive load is increased and induces a progression in skin-stringer separation. The global-local coupling loops are repeated until panel failure occurs. The approach is applied to a case of a representative one-stringer stiffened panel and to a stiffened panel for which test results are available. A good correspondence with reference results and test results demonstrates the effectiveness of the global-local approach presented.

AB - According to various experimental results, stiffened panels under compressive loading are prone to debonding between the skin and the flange of the stringer. In this paper, a novel two-way global-local coupling approach is presented that is able to model progressive separation of the skin and stringer in stiffened CFRP panels under compression. The main goal of this methodology is to examine skin-stringer debonding at two levels of accuracy, taking advantage of the fast calculations at the global level and assessing in detail the damage propagation at the local level. First, critical areas are defined in a global model with a standard mesh, and local models with a considerably finer mesh are created by means of a submodeling technique. Secondly, a local model analysis is conducted, in which cohesive elements are applied to simulate debonding. Particularly important is the appropriate information exchange in both directions between the different steps of the coupling analysis. Averaged degraded properties are defined at the local model level and transferred back to the global level. The applied compressive load is increased and induces a progression in skin-stringer separation. The global-local coupling loops are repeated until panel failure occurs. The approach is applied to a case of a representative one-stringer stiffened panel and to a stiffened panel for which test results are available. A good correspondence with reference results and test results demonstrates the effectiveness of the global-local approach presented.

KW - Composite structures

KW - Delamination

KW - Global-local method

KW - Multiscale analysis

KW - Postbuckling

KW - Progressive failure analysis

KW - Skin-stringer debonding

KW - Stiffened panels

UR - http://www.scopus.com/inward/record.url?scp=85049306153&partnerID=8YFLogxK

U2 - 10.1016/j.compstruct.2018.06.064

DO - 10.1016/j.compstruct.2018.06.064

M3 - Article

AN - SCOPUS:85049306153

VL - 202

SP - 1280

EP - 1294

JO - Composite structures

JF - Composite structures

SN - 0263-8223

ER -