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Physical interaction effects of out of plane waviness and impact damages of fiber composite structures

Al-Kathemi, Nagham (2022) Physical interaction effects of out of plane waviness and impact damages of fiber composite structures. Dissertation, Universität Bremen.

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Abstract

This thesis provides the experimental investigations for an improved physical understanding of the interaction behavior between out of plane waviness (OoP) and low velocity impact damages. Plain strength compression (PSC), impact as well as compression after impact (CAI) tests on the compression strength of a quasi-isotropic laminates were conducted. The effects of OoP waviness and impact damages were considered separately and simultaneously. In the PSC case, two thicknesses with different waviness configurations were tested in order to identify the critical waviness parameters and their dependence on the thickness. A corresponding pure waviness Knock-Down-Factor (KDF) was derived. In the CAI case, one thickness with different waviness configurations as well as one configuration without waviness were tested. The CAI tests with and without waviness led to the derivation of three KDFs. The experimental results reveal that the waviness effect in the investigated impact energy level is present, even if the corresponding KDF is not always degraded. Waviness effects cannot compensate impact effects or vice versa, accordingly, the interaction behavior represents approximately a multiplicative relation which can be simplified by superposition of both effects individually.

Item URL in elib:https://elib.dlr.de/196609/
Document Type:Thesis (Dissertation)
Title:Physical interaction effects of out of plane waviness and impact damages of fiber composite structures
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Al-Kathemi, NaghamUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Date:17 January 2022
Journal or Publication Title:DLR
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Number of Pages:113
Status:Published
Keywords:Compression after impact (CAI), plain strength compression (PSC), damage tolerance (DT), interaction effect, manufacturing defects, low velocity impact
Institution:Universität Bremen
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Components and Systems
DLR - Research area:Aeronautics
DLR - Program:L CS - Components and Systems
DLR - Research theme (Project):L - Structural Materials and Design
Location: Braunschweig
Institutes and Institutions:Institut für Systemleichtbau > Structural Mechanics
Deposited By: Degenhardt, Prof. Dr. Richard
Deposited On:28 Aug 2023 08:57
Last Modified:15 Sep 2023 13:57

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