Residual strength of sandwich panels with hail damage

Manabendra Das, Erkan Oterkus, Erdogan Madenci, Hamid Razi

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Hail strikes, possibly exceeding an energy level of 50 J, may cause damage to thin-gauged composite airplane structures in the form of an indentation or puncture of the top facesheet. If not repaired properly, they may trigger extensive damage to airplane structures and disruptions to airline operations, therefore posing a major maintenance and repair concern for the airlines. It is important that both the original equipment manufacturer and the airlines be able to classify the hail strike damage in order to establish appropriate repair procedures. This study presents a methodology to assist engineers in the classification of the repair type for hail strike damage through the determination of allowable damage size. The methodology involves an accurate prediction of stress and strain fields and residual strength prediction. The stress analysis is performed by utilizing a plate element based on a higher-order single-layer theory. The damage zone model, previously used for notched panels, has been employed to predict the residual strength of sandwich panels with indented facesheets subjected to tensile load. The failure load is established when crack propagation in the facesheet becomes unstable.
LanguageEnglish
Pages403-412
Number of pages10
JournalComposite Structures
Volume88
Issue number3
Early online date15 May 2008
DOIs
Publication statusPublished - May 2009

Fingerprint

Precipitation (meteorology)
Repair
Aircraft
Stress analysis
Indentation
Electron energy levels
Crack propagation
Engineers
Composite materials

Keywords

  • repair
  • sandwich
  • indentation
  • residual strength

Cite this

Das, Manabendra ; Oterkus, Erkan ; Madenci, Erdogan ; Razi, Hamid. / Residual strength of sandwich panels with hail damage. In: Composite Structures. 2009 ; Vol. 88, No. 3. pp. 403-412.
@article{6c7e88e876034b5ba9b7123e44ac9ab1,
title = "Residual strength of sandwich panels with hail damage",
abstract = "Hail strikes, possibly exceeding an energy level of 50 J, may cause damage to thin-gauged composite airplane structures in the form of an indentation or puncture of the top facesheet. If not repaired properly, they may trigger extensive damage to airplane structures and disruptions to airline operations, therefore posing a major maintenance and repair concern for the airlines. It is important that both the original equipment manufacturer and the airlines be able to classify the hail strike damage in order to establish appropriate repair procedures. This study presents a methodology to assist engineers in the classification of the repair type for hail strike damage through the determination of allowable damage size. The methodology involves an accurate prediction of stress and strain fields and residual strength prediction. The stress analysis is performed by utilizing a plate element based on a higher-order single-layer theory. The damage zone model, previously used for notched panels, has been employed to predict the residual strength of sandwich panels with indented facesheets subjected to tensile load. The failure load is established when crack propagation in the facesheet becomes unstable.",
keywords = "repair, sandwich, indentation, residual strength",
author = "Manabendra Das and Erkan Oterkus and Erdogan Madenci and Hamid Razi",
year = "2009",
month = "5",
doi = "10.1016/j.compstruct.2008.05.002",
language = "English",
volume = "88",
pages = "403--412",
journal = "Composite Structures",
issn = "0263-8223",
number = "3",

}

Residual strength of sandwich panels with hail damage. / Das, Manabendra; Oterkus, Erkan; Madenci, Erdogan; Razi, Hamid.

In: Composite Structures, Vol. 88, No. 3, 05.2009, p. 403-412.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Residual strength of sandwich panels with hail damage

AU - Das, Manabendra

AU - Oterkus, Erkan

AU - Madenci, Erdogan

AU - Razi, Hamid

PY - 2009/5

Y1 - 2009/5

N2 - Hail strikes, possibly exceeding an energy level of 50 J, may cause damage to thin-gauged composite airplane structures in the form of an indentation or puncture of the top facesheet. If not repaired properly, they may trigger extensive damage to airplane structures and disruptions to airline operations, therefore posing a major maintenance and repair concern for the airlines. It is important that both the original equipment manufacturer and the airlines be able to classify the hail strike damage in order to establish appropriate repair procedures. This study presents a methodology to assist engineers in the classification of the repair type for hail strike damage through the determination of allowable damage size. The methodology involves an accurate prediction of stress and strain fields and residual strength prediction. The stress analysis is performed by utilizing a plate element based on a higher-order single-layer theory. The damage zone model, previously used for notched panels, has been employed to predict the residual strength of sandwich panels with indented facesheets subjected to tensile load. The failure load is established when crack propagation in the facesheet becomes unstable.

AB - Hail strikes, possibly exceeding an energy level of 50 J, may cause damage to thin-gauged composite airplane structures in the form of an indentation or puncture of the top facesheet. If not repaired properly, they may trigger extensive damage to airplane structures and disruptions to airline operations, therefore posing a major maintenance and repair concern for the airlines. It is important that both the original equipment manufacturer and the airlines be able to classify the hail strike damage in order to establish appropriate repair procedures. This study presents a methodology to assist engineers in the classification of the repair type for hail strike damage through the determination of allowable damage size. The methodology involves an accurate prediction of stress and strain fields and residual strength prediction. The stress analysis is performed by utilizing a plate element based on a higher-order single-layer theory. The damage zone model, previously used for notched panels, has been employed to predict the residual strength of sandwich panels with indented facesheets subjected to tensile load. The failure load is established when crack propagation in the facesheet becomes unstable.

KW - repair

KW - sandwich

KW - indentation

KW - residual strength

U2 - 10.1016/j.compstruct.2008.05.002

DO - 10.1016/j.compstruct.2008.05.002

M3 - Article

VL - 88

SP - 403

EP - 412

JO - Composite Structures

T2 - Composite Structures

JF - Composite Structures

SN - 0263-8223

IS - 3

ER -