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Experimental analysis of composite single-lap joints using digital image correlation and comparison with theoretical models.

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Title: Experimental analysis of composite single-lap joints using digital image correlation and comparison with theoretical models.
Authors: Kumar, RL Vijaya vkumar.aero@gmail.com, Bhat, MR, Murthy, CRL
Source: Journal of Reinforced Plastics & Composites. Dec2013, Vol. 32 Issue 23, p1858-1876. 19p.
Subjects: Composite materials, Digital image processing, Comparative studies, Energy consumption, Moisture, Adhesive joints, Strains & stresses (Mechanics)
Abstract: The demand for energy efficient, low weight structures has boosted the use of composite structures assembled using increased quantities of structural adhesives. Bonded structures may be subjected to severe working environments such as high temperature and moisture due to which the adhesive gets degraded over a period of time. This reduces the strength of a joint and leads to premature failure. Measurement of strains in the adhesive bondline at any point of time during service may be beneficial as an assessment can be made on the integrity of a joint and necessary preventive actions may be taken before failure. This paper presents an experimental approach of measuring peel and shear strains in the adhesive bondline of composite single-lap joints using digital image correlation. Different sets of composite adhesive joints with varied bond quality were prepared and subjected to tensile load during which digital images were taken and processed using digital image correlation software. The measured peel strain at the joint edge showed a rapid increase with the initiation of a crack till failure of the joint. The measured strains were used to compute the corresponding stresses assuming a plane strain condition and the results were compared with stresses predicted using theoretical models, namely linear and nonlinear adhesive beam models. A similar trend in stress distribution was observed. Further comparison of peel and shear strains also exhibited similar trend for both healthy and degraded joints. Maximum peel stress failure criterion was used to predict the failure load of a composite adhesive joint and a comparison was made between predicted and actual failure loads. The predicted failure loads from theoretical models were found to be higher than the actual failure load for all the joints. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Reinforced Plastics & Composites is the property of Sage Publications, Ltd. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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DbLabel: Engineering Source
An: 92663342
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Data: Experimental analysis of composite single-lap joints using digital image correlation and comparison with theoretical models.
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  Data: <searchLink fieldCode="AR" term="%22Kumar%2C+RL+Vijaya%22">Kumar, RL Vijaya</searchLink><i> vkumar.aero@gmail.com</i><br /><searchLink fieldCode="AR" term="%22Bhat%2C+MR%22">Bhat, MR</searchLink><br /><searchLink fieldCode="AR" term="%22Murthy%2C+CRL%22">Murthy, CRL</searchLink>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Reinforced+Plastics+%26+Composites%22">Journal of Reinforced Plastics & Composites</searchLink>. Dec2013, Vol. 32 Issue 23, p1858-1876. 19p.
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  Data: <searchLink fieldCode="DE" term="%22Composite+materials%22">Composite materials</searchLink><br /><searchLink fieldCode="DE" term="%22Digital+image+processing%22">Digital image processing</searchLink><br /><searchLink fieldCode="DE" term="%22Comparative+studies%22">Comparative studies</searchLink><br /><searchLink fieldCode="DE" term="%22Energy+consumption%22">Energy consumption</searchLink><br /><searchLink fieldCode="DE" term="%22Moisture%22">Moisture</searchLink><br /><searchLink fieldCode="DE" term="%22Adhesive+joints%22">Adhesive joints</searchLink><br /><searchLink fieldCode="DE" term="%22Strains+%26+stresses+%28Mechanics%29%22">Strains & stresses (Mechanics)</searchLink>
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  Label: Abstract
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  Data: The demand for energy efficient, low weight structures has boosted the use of composite structures assembled using increased quantities of structural adhesives. Bonded structures may be subjected to severe working environments such as high temperature and moisture due to which the adhesive gets degraded over a period of time. This reduces the strength of a joint and leads to premature failure. Measurement of strains in the adhesive bondline at any point of time during service may be beneficial as an assessment can be made on the integrity of a joint and necessary preventive actions may be taken before failure. This paper presents an experimental approach of measuring peel and shear strains in the adhesive bondline of composite single-lap joints using digital image correlation. Different sets of composite adhesive joints with varied bond quality were prepared and subjected to tensile load during which digital images were taken and processed using digital image correlation software. The measured peel strain at the joint edge showed a rapid increase with the initiation of a crack till failure of the joint. The measured strains were used to compute the corresponding stresses assuming a plane strain condition and the results were compared with stresses predicted using theoretical models, namely linear and nonlinear adhesive beam models. A similar trend in stress distribution was observed. Further comparison of peel and shear strains also exhibited similar trend for both healthy and degraded joints. Maximum peel stress failure criterion was used to predict the failure load of a composite adhesive joint and a comparison was made between predicted and actual failure loads. The predicted failure loads from theoretical models were found to be higher than the actual failure load for all the joints. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Reinforced Plastics & Composites is the property of Sage Publications, Ltd. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1177/0731684413500859
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      – Code: eng
        Text: English
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        PageCount: 19
        StartPage: 1858
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      – SubjectFull: Composite materials
        Type: general
      – SubjectFull: Digital image processing
        Type: general
      – SubjectFull: Comparative studies
        Type: general
      – SubjectFull: Energy consumption
        Type: general
      – SubjectFull: Moisture
        Type: general
      – SubjectFull: Adhesive joints
        Type: general
      – SubjectFull: Strains & stresses (Mechanics)
        Type: general
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      – TitleFull: Experimental analysis of composite single-lap joints using digital image correlation and comparison with theoretical models.
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            NameFull: Kumar, RL Vijaya
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            NameFull: Bhat, MR
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            – D: 01
              M: 12
              Text: Dec2013
              Type: published
              Y: 2013
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