Investigation of transverse residual stresses in a thick pultruded composite using digital image correlation with hole drilling

Onur Yuksel, Ismet Baran, Nuri Ersoy, Remko Akkerman

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Abstract

Process induced residual stresses are one of the main sources of defects such as (pre) mature matrix cracking during pultrusion of fiber reinforced polymer composite profiles. Recently, comprehensive process models have been developed to understand and describe the underlying mechanisms of the residual stresses in pultrusion processes. The predicted stresses however have not been validated with experimental measurements which are necessary to verify the implemented material models and assumptions in the process models. A hole drilling method with digital image correlation (DIC) is used in the present work to measure the transverse strain relaxation due to material removal in a pultruded thick composite profile (20 × 20 mm) made of unidirectional glass/polyester. The corresponding residual stress state is back calculated using the measured strains in a finite element based numerical model. The estimated level of transverse residual stress in the core of the profile was found to be 6.1 MPa in tension.

Original languageEnglish
Article number110954
JournalComposite structures
Volume223
DOIs
Publication statusPublished - 1 Sep 2019

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Residual stresses
Drilling
Pultrusion
Composite materials
Strain relaxation
Polyesters
Numerical models
Polymers
Glass
Defects
Fibers

Keywords

  • B. Residual/internal stress
  • C. Finite element analysis (FEA)
  • Digital image correlation (DIC)
  • E. Pultrusion
  • Hole drilling

Cite this

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abstract = "Process induced residual stresses are one of the main sources of defects such as (pre) mature matrix cracking during pultrusion of fiber reinforced polymer composite profiles. Recently, comprehensive process models have been developed to understand and describe the underlying mechanisms of the residual stresses in pultrusion processes. The predicted stresses however have not been validated with experimental measurements which are necessary to verify the implemented material models and assumptions in the process models. A hole drilling method with digital image correlation (DIC) is used in the present work to measure the transverse strain relaxation due to material removal in a pultruded thick composite profile (20 × 20 mm) made of unidirectional glass/polyester. The corresponding residual stress state is back calculated using the measured strains in a finite element based numerical model. The estimated level of transverse residual stress in the core of the profile was found to be 6.1 MPa in tension.",
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Investigation of transverse residual stresses in a thick pultruded composite using digital image correlation with hole drilling. / Yuksel, Onur; Baran, Ismet; Ersoy, Nuri; Akkerman, Remko.

In: Composite structures, Vol. 223, 110954, 01.09.2019.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Investigation of transverse residual stresses in a thick pultruded composite using digital image correlation with hole drilling

AU - Yuksel, Onur

AU - Baran, Ismet

AU - Ersoy, Nuri

AU - Akkerman, Remko

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N2 - Process induced residual stresses are one of the main sources of defects such as (pre) mature matrix cracking during pultrusion of fiber reinforced polymer composite profiles. Recently, comprehensive process models have been developed to understand and describe the underlying mechanisms of the residual stresses in pultrusion processes. The predicted stresses however have not been validated with experimental measurements which are necessary to verify the implemented material models and assumptions in the process models. A hole drilling method with digital image correlation (DIC) is used in the present work to measure the transverse strain relaxation due to material removal in a pultruded thick composite profile (20 × 20 mm) made of unidirectional glass/polyester. The corresponding residual stress state is back calculated using the measured strains in a finite element based numerical model. The estimated level of transverse residual stress in the core of the profile was found to be 6.1 MPa in tension.

AB - Process induced residual stresses are one of the main sources of defects such as (pre) mature matrix cracking during pultrusion of fiber reinforced polymer composite profiles. Recently, comprehensive process models have been developed to understand and describe the underlying mechanisms of the residual stresses in pultrusion processes. The predicted stresses however have not been validated with experimental measurements which are necessary to verify the implemented material models and assumptions in the process models. A hole drilling method with digital image correlation (DIC) is used in the present work to measure the transverse strain relaxation due to material removal in a pultruded thick composite profile (20 × 20 mm) made of unidirectional glass/polyester. The corresponding residual stress state is back calculated using the measured strains in a finite element based numerical model. The estimated level of transverse residual stress in the core of the profile was found to be 6.1 MPa in tension.

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KW - Digital image correlation (DIC)

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