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Evaluation of Different Ice Adhesion Tests for Mechanical Deicing Systems

Schulz, Martin and Sinapius, Michael (2015) Evaluation of Different Ice Adhesion Tests for Mechanical Deicing Systems. In: SAE 2015 International Conference on Icing of Aircraft, Engines and Structures, 2015-1 (2135). SAE International. 2015 International Conference on Icing of Aircraft, Engines and Structures, 22.-25. Jun. 2015, Prag, Tschechien. doi: 10.4271/2015-01-2135.

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Abstract

A designer of a new mechanical ice protection system for airplanes needs to know how much and in which way he has to deform the surface to break off the ice. The ice adhesion strength is often used as a design value. Several methods have been published to measure the adhesive strength of ice. This paper analyzes the interface stresses created by those methods and discusses the way the adhesion strength is derived. A finite element method tool is used to provide insight into the stress state for different load cases. The implication of these illustrations is that equations which use only ultimate force and total interfacial area to calculate adhesion strength miss local stress concentrations and crack nucleation. Hence, the derived adhesion strength may not be comparable within different testing methods, because each testing procedure neglects different parameters like specimen size, substrate thickness and stiffness. In addition the ice adhesion strength is different if peel stress or homogeneous shear stress is applied. Adhesive joint theory can be used to show how to model stress concentrations. Mentioned theory explains why thick ice layers break off more easily, and bending is the most efficient load case to remove ice. Preliminary concepts for new designs of mechanical IPS are given by improving the understanding of stress concentration.

Item URL in elib:https://elib.dlr.de/96969/
Document Type:Conference or Workshop Item (Speech)
Title:Evaluation of Different Ice Adhesion Tests for Mechanical Deicing Systems
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Schulz, Martinmartin.schulz (at) dlr.deUNSPECIFIED
Sinapius, Michaelmichael.sinapius (at) dlr.deUNSPECIFIED
Date:25 June 2015
Journal or Publication Title:SAE 2015 International Conference on Icing of Aircraft, Engines and Structures
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Volume:2015-1
DOI :10.4271/2015-01-2135
Publisher:SAE International
Series Name:SAE Technical Paper
Status:Published
Keywords:ice adhesion test methods, FE-Analysis,
Event Title:2015 International Conference on Icing of Aircraft, Engines and Structures
Event Location:Prag, Tschechien
Event Type:international Conference
Event Dates:22.-25. Jun. 2015
Organizer:SAE International
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 - Concepts and Integration (old)
Location: Braunschweig
Institutes and Institutions:Institute of Composite Structures and Adaptive Systems > Adaptronics
Deposited By: Schulz, Martin
Deposited On:06 Jul 2015 09:51
Last Modified:11 Jan 2016 09:45

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