Mode mixity analysis of face/core debonds in a single cantilever beam sandwich specimen

Vishnu Saseendran*, Christian Berggreen, Ronald Krueger

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The single cantilever beam sandwich specimen has been proposed, as a fracture test standard for mode I peel loading. Critical parameters, including specimen dimensions, determine whether the crack propagates along the face/core interface in mode I during the fracture test. This paper outlines a parametric study based on a numerical method to examine local mode mixity conditions for a wide array of sandwich systems by varying several geometrical and material parameters. The thickness and modulus of the face sheet were seen to influence the mode mixity for most sandwich systems. Core Poisson’s ratio was shown to influence the local mode mixity and has the capability of driving the crack along the interface or into the core. The effect of the intact specimen length was analyzed and presented from a mode mixity perspective based on various elastic foundation modulus expressions. Reinforcement of the single cantilever beam specimen with stiff layers was also investigated numerically and compared with a similar analysis in the literature. The analysis presented in this paper shows that, despite reducing the global shear component, the local mode mixity condition deviated away from the mode I regime for several sandwich specimens. An appropriate foundation model along with a minimum loading rod length was one of the recommendations provided from the analyses, which may supplement the ASTM International standardization efforts.
Original languageEnglish
JournalJournal of Sandwich Structures and Materials
Number of pages31
ISSN1099-6362
DOIs
Publication statusAccepted/In press - 2019

Keywords

  • Single cantilever beam
  • Sandwich
  • Debond
  • Mode mixity
  • Face/core interface
  • Phase angle
  • CSDE

Cite this

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title = "Mode mixity analysis of face/core debonds in a single cantilever beam sandwich specimen",
abstract = "The single cantilever beam sandwich specimen has been proposed, as a fracture test standard for mode I peel loading. Critical parameters, including specimen dimensions, determine whether the crack propagates along the face/core interface in mode I during the fracture test. This paper outlines a parametric study based on a numerical method to examine local mode mixity conditions for a wide array of sandwich systems by varying several geometrical and material parameters. The thickness and modulus of the face sheet were seen to influence the mode mixity for most sandwich systems. Core Poisson’s ratio was shown to influence the local mode mixity and has the capability of driving the crack along the interface or into the core. The effect of the intact specimen length was analyzed and presented from a mode mixity perspective based on various elastic foundation modulus expressions. Reinforcement of the single cantilever beam specimen with stiff layers was also investigated numerically and compared with a similar analysis in the literature. The analysis presented in this paper shows that, despite reducing the global shear component, the local mode mixity condition deviated away from the mode I regime for several sandwich specimens. An appropriate foundation model along with a minimum loading rod length was one of the recommendations provided from the analyses, which may supplement the ASTM International standardization efforts.",
keywords = "Single cantilever beam, Sandwich, Debond, Mode mixity, Face/core interface, Phase angle, CSDE",
author = "Vishnu Saseendran and Christian Berggreen and Ronald Krueger",
year = "2019",
doi = "10.1177/1099636218788223",
language = "English",
journal = "Journal of Sandwich Structures & Materials",
issn = "1099-6362",
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}

Mode mixity analysis of face/core debonds in a single cantilever beam sandwich specimen. / Saseendran, Vishnu; Berggreen, Christian; Krueger, Ronald.

In: Journal of Sandwich Structures and Materials, 2019.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Mode mixity analysis of face/core debonds in a single cantilever beam sandwich specimen

AU - Saseendran, Vishnu

AU - Berggreen, Christian

AU - Krueger, Ronald

PY - 2019

Y1 - 2019

N2 - The single cantilever beam sandwich specimen has been proposed, as a fracture test standard for mode I peel loading. Critical parameters, including specimen dimensions, determine whether the crack propagates along the face/core interface in mode I during the fracture test. This paper outlines a parametric study based on a numerical method to examine local mode mixity conditions for a wide array of sandwich systems by varying several geometrical and material parameters. The thickness and modulus of the face sheet were seen to influence the mode mixity for most sandwich systems. Core Poisson’s ratio was shown to influence the local mode mixity and has the capability of driving the crack along the interface or into the core. The effect of the intact specimen length was analyzed and presented from a mode mixity perspective based on various elastic foundation modulus expressions. Reinforcement of the single cantilever beam specimen with stiff layers was also investigated numerically and compared with a similar analysis in the literature. The analysis presented in this paper shows that, despite reducing the global shear component, the local mode mixity condition deviated away from the mode I regime for several sandwich specimens. An appropriate foundation model along with a minimum loading rod length was one of the recommendations provided from the analyses, which may supplement the ASTM International standardization efforts.

AB - The single cantilever beam sandwich specimen has been proposed, as a fracture test standard for mode I peel loading. Critical parameters, including specimen dimensions, determine whether the crack propagates along the face/core interface in mode I during the fracture test. This paper outlines a parametric study based on a numerical method to examine local mode mixity conditions for a wide array of sandwich systems by varying several geometrical and material parameters. The thickness and modulus of the face sheet were seen to influence the mode mixity for most sandwich systems. Core Poisson’s ratio was shown to influence the local mode mixity and has the capability of driving the crack along the interface or into the core. The effect of the intact specimen length was analyzed and presented from a mode mixity perspective based on various elastic foundation modulus expressions. Reinforcement of the single cantilever beam specimen with stiff layers was also investigated numerically and compared with a similar analysis in the literature. The analysis presented in this paper shows that, despite reducing the global shear component, the local mode mixity condition deviated away from the mode I regime for several sandwich specimens. An appropriate foundation model along with a minimum loading rod length was one of the recommendations provided from the analyses, which may supplement the ASTM International standardization efforts.

KW - Single cantilever beam

KW - Sandwich

KW - Debond

KW - Mode mixity

KW - Face/core interface

KW - Phase angle

KW - CSDE

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DO - 10.1177/1099636218788223

M3 - Journal article

JO - Journal of Sandwich Structures & Materials

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