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Test Setup for Investigating the Impact Behavior of Biaxially Prestressed Composite Laminates

  • Instrumented impact testing and compression-after-impact testing are important to adequately qualify material behavior and safely design composite structures. However, the stresses to which fiber-reinforced plastic components are typically subjected in practice are not considered in the impact test methods recommended in guidelines or standards. In this paper, a test setup for investigating the impact behavior of composite specimens under plane uniaxial and biaxial preloading is presented. For this purpose, a special test setup consisting of a biaxial testing machine and a specially designed drop-weight tower was developed. The design decisions were derived from existing guidelines and standards with the aim of inducing barely visible impact damage in laminated carbon fiber-reinforced plastic specimens. Several measurement systems have been integrated into the setup to allow comprehensive observation of the impact event and specimen behavior. A feasibility test was performed with biaxially prestressed carbon fiber-reinforced plastic specimens in comparison with unstressed reference tests. The compressive-tensile prestressing resulted in lower maximum contact forces, higher maximum deflections, higher residual deflections and a different damage pattern, which was investigated by light microscopic analysis. Finally, the functionality of the experimental setup is discussed, and the results seem to indicate that the test setup and parameters were properly chosen to investigate the effect of prestresses on the impacts behavior of composite structures, in particular for barely visible subsequent damages.

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Metadaten
Author:Christian PongratzORCiD, Janek Tix, Johannes Wolfrum, Steffen Gerke, Ingo EhrlichORCiDGND, Michael Brünig
URN:urn:nbn:de:bvb:898-opus4-70355
DOI:https://doi.org/10.1007/s40799-024-00701-4
ISSN:0732-8818
Parent Title (English):Experimental Techniques
Publisher:Springer Nature
Document Type:Article
Language:English
Year of first Publication:2024
Publishing Institution:Ostbayerische Technische Hochschule Regensburg
Release Date:2024/02/19
Tag:Mechanical Engineering; Mechanics of Materials
GND Keyword:Faserverbundwerkstoff; Schlagprüfung
Pagenumber:14 S.
Note:
Corresponding authors: Christian Pongratz und Ingo Ehrlich
Institutes:Fakultät Maschinenbau
Technologie-Campus Neustadt an der Donau
Fakultät Maschinenbau / Labor Faserverbundtechnik (LFT)
Begutachtungsstatus:peer-reviewed
research focus:Produktion und Systeme
OpenAccess Publikationsweg:Corresponding author der OTH Regensburg
Funding:DEAL Springer Nature
Licence (German):Creative Commons - CC BY - Namensnennung 4.0 International