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An experimental study of the damage growth in composite laminates under tension-fatigue after impact

Bogenfeld, Raffael Marius and Schnmiedel, Patrik and Kuruvadi, Naren and Wille, Tobias and Kreikemeier, Janko (2020) An experimental study of the damage growth in composite laminates under tension-fatigue after impact. Composites Science and Technology (191). Elsevier. DOI: 10.1016/j.compscitech.2020.108082 ISSN 0266-3538

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Official URL: https://www.sciencedirect.com/science/article/abs/pii/S0266353820301652?via%3Dihub

Abstract

The behavior of damaged laminates under cyclic load is crucial to the damage tolerance of composite structures. In this experimental study, we investigate impact damaged laminates under tension–fatigue loading. For that purpose, a tension after impact (TAI) specimen is designed, which exhibits a similar impact behavior like a specimen of the established compression after impact (CAI) standard. A set of quasi-static TAI tests is conducted as a reference for the investigation under cyclic load. A 30 J impact was chosen as the baseline, causing a delamination-dominated barely visible impact damage. For the cyclic test, fifteen TAI specimens were distributed over three load levels. The tests reveal a widespread fatigue effect, edge delamination, and a significant growth of the impact-induced delamination. The damage propagates mainly in the load direction and in the interfaces close to the impact side. The observed delamination growth can be explained through to the fiber cracks caused by the impact. Moreover, the growth rate exhibits severe outliers, whose damage propagates exceptionally fast. These outliers can be traced back to the morphology of the impact damage. The qualitative pattern of fiber fracture massively influences the delamination propagation. Based on this dependency we outline the need for a qualitative evaluation of impact damage and its scatter.

Item URL in elib:https://elib.dlr.de/134441/
Document Type:Article
Title:An experimental study of the damage growth in composite laminates under tension-fatigue after impact
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Bogenfeld, Raffael MariusRaffael.Bogenfeld (at) dlr.dehttps://orcid.org/0000-0003-3883-269X
Schnmiedel, PatrikAirbus Helicopters Deutschland GmbHUNSPECIFIED
Kuruvadi, NarenAirbus Helicopters Deutschland GmbHUNSPECIFIED
Wille, Tobiastobias.wille (at) dlr.deUNSPECIFIED
Kreikemeier, JankoJanko.Kreikemeier (at) dlr.deUNSPECIFIED
Date:3 May 2020
Journal or Publication Title:Composites Science and Technology
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1016/j.compscitech.2020.108082
Editors:
EditorsEmailEditor's ORCID iD
Schulte, KarlUNSPECIFIEDUNSPECIFIED
Publisher:Elsevier
ISSN:0266-3538
Status:Published
Keywords:Damage tolerance; Damage growth; Impact damage; Delamination; Fatigue after impact; Cyclic load
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Structures and Materials
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Structural Mechanics
Deposited By: Bogenfeld, Raffael Marius
Deposited On:16 Mar 2020 09:17
Last Modified:16 Mar 2020 09:17

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