Fracture Characterization of PVC Foam Core Sandwich Specimen Using the DCB-UBM Test Method

Vishnu Saseendran, Christian Berggreen, Leif A. Carlsson

Research output: Contribution to conferencePaperResearchpeer-review

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Abstract

Face/core debond failure in sandwich composites is a critical failure mode. Lack of cohesion between face and core will lead to loss of structural integrity. The estimation of interface fracture toughness especially at the face/core interface is extremely challenging, provided the dissimilarity of material properties across the interface. The crack path and fracture also depend on the loading configuration at the crack tip. Depending on the type of loading applied, a measure of shear deformation at the crack tip is expressed by the mode-mixity phase angle (ψ). A suitable fracture mechanics approach coupled with experimental validation is paramount to determine the fracture resistance of the face/core interface. In this paper, the test-rig exploiting the double cantilever beam with uneven bending moments (DCB-UBM) concept is used to determine the fracture toughness of PVC foam core sandwich composites. The DCB-UBM test enables fracture testing over a large range of mode-mixities as expressed by a phase angle (ψ) which is a measure of the amount of shear loading at the crack tip. A desired phase angle may be achieved by changing the moment-ratio (MR = Md/Ms).
Original languageEnglish
Publication date2017
Number of pages6
Publication statusPublished - 2017
Event21st International Conference on Composite Materials (ICCM-21) - Xi'an, China
Duration: 20 Aug 201725 Aug 2017

Conference

Conference21st International Conference on Composite Materials (ICCM-21)
CountryChina
CityXi'an
Period20/08/201725/08/2017

Keywords

  • Sandwich composites
  • DCB-UBM
  • CSDE-method
  • PVC foam core
  • Moment ratio

Cite this

Saseendran, V., Berggreen, C., & Carlsson, L. A. (2017). Fracture Characterization of PVC Foam Core Sandwich Specimen Using the DCB-UBM Test Method. Paper presented at 21st International Conference on Composite Materials (ICCM-21), Xi'an, China.
Saseendran, Vishnu ; Berggreen, Christian ; Carlsson, Leif A. / Fracture Characterization of PVC Foam Core Sandwich Specimen Using the DCB-UBM Test Method. Paper presented at 21st International Conference on Composite Materials (ICCM-21), Xi'an, China.6 p.
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title = "Fracture Characterization of PVC Foam Core Sandwich Specimen Using the DCB-UBM Test Method",
abstract = "Face/core debond failure in sandwich composites is a critical failure mode. Lack of cohesion between face and core will lead to loss of structural integrity. The estimation of interface fracture toughness especially at the face/core interface is extremely challenging, provided the dissimilarity of material properties across the interface. The crack path and fracture also depend on the loading configuration at the crack tip. Depending on the type of loading applied, a measure of shear deformation at the crack tip is expressed by the mode-mixity phase angle (ψ). A suitable fracture mechanics approach coupled with experimental validation is paramount to determine the fracture resistance of the face/core interface. In this paper, the test-rig exploiting the double cantilever beam with uneven bending moments (DCB-UBM) concept is used to determine the fracture toughness of PVC foam core sandwich composites. The DCB-UBM test enables fracture testing over a large range of mode-mixities as expressed by a phase angle (ψ) which is a measure of the amount of shear loading at the crack tip. A desired phase angle may be achieved by changing the moment-ratio (MR = Md/Ms).",
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note = "21st International Conference on Composite Materials (ICCM-21) ; Conference date: 20-08-2017 Through 25-08-2017",

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Saseendran, V, Berggreen, C & Carlsson, LA 2017, 'Fracture Characterization of PVC Foam Core Sandwich Specimen Using the DCB-UBM Test Method' Paper presented at 21st International Conference on Composite Materials (ICCM-21), Xi'an, China, 20/08/2017 - 25/08/2017, .

Fracture Characterization of PVC Foam Core Sandwich Specimen Using the DCB-UBM Test Method. / Saseendran, Vishnu; Berggreen, Christian; Carlsson, Leif A.

2017. Paper presented at 21st International Conference on Composite Materials (ICCM-21), Xi'an, China.

Research output: Contribution to conferencePaperResearchpeer-review

TY - CONF

T1 - Fracture Characterization of PVC Foam Core Sandwich Specimen Using the DCB-UBM Test Method

AU - Saseendran, Vishnu

AU - Berggreen, Christian

AU - Carlsson, Leif A.

PY - 2017

Y1 - 2017

N2 - Face/core debond failure in sandwich composites is a critical failure mode. Lack of cohesion between face and core will lead to loss of structural integrity. The estimation of interface fracture toughness especially at the face/core interface is extremely challenging, provided the dissimilarity of material properties across the interface. The crack path and fracture also depend on the loading configuration at the crack tip. Depending on the type of loading applied, a measure of shear deformation at the crack tip is expressed by the mode-mixity phase angle (ψ). A suitable fracture mechanics approach coupled with experimental validation is paramount to determine the fracture resistance of the face/core interface. In this paper, the test-rig exploiting the double cantilever beam with uneven bending moments (DCB-UBM) concept is used to determine the fracture toughness of PVC foam core sandwich composites. The DCB-UBM test enables fracture testing over a large range of mode-mixities as expressed by a phase angle (ψ) which is a measure of the amount of shear loading at the crack tip. A desired phase angle may be achieved by changing the moment-ratio (MR = Md/Ms).

AB - Face/core debond failure in sandwich composites is a critical failure mode. Lack of cohesion between face and core will lead to loss of structural integrity. The estimation of interface fracture toughness especially at the face/core interface is extremely challenging, provided the dissimilarity of material properties across the interface. The crack path and fracture also depend on the loading configuration at the crack tip. Depending on the type of loading applied, a measure of shear deformation at the crack tip is expressed by the mode-mixity phase angle (ψ). A suitable fracture mechanics approach coupled with experimental validation is paramount to determine the fracture resistance of the face/core interface. In this paper, the test-rig exploiting the double cantilever beam with uneven bending moments (DCB-UBM) concept is used to determine the fracture toughness of PVC foam core sandwich composites. The DCB-UBM test enables fracture testing over a large range of mode-mixities as expressed by a phase angle (ψ) which is a measure of the amount of shear loading at the crack tip. A desired phase angle may be achieved by changing the moment-ratio (MR = Md/Ms).

KW - Sandwich composites

KW - DCB-UBM

KW - CSDE-method

KW - PVC foam core

KW - Moment ratio

M3 - Paper

ER -

Saseendran V, Berggreen C, Carlsson LA. Fracture Characterization of PVC Foam Core Sandwich Specimen Using the DCB-UBM Test Method. 2017. Paper presented at 21st International Conference on Composite Materials (ICCM-21), Xi'an, China.