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Measurement of CTOD along a surface crack by means of digital image correlation

Kaveh Samadian (UGent) , Stijn Hertelé (UGent) and Wim De Waele (UGent)
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Abstract
The experimental measurement of fracture toughness and crack driving force are the main steps for the application of fracture mechanics methods in structural integrity assessment. Crack Tip Opening Displacement (CTOD), defined as the opening of a defect at its crack front upon loading a test specimen or structure, is one of the most important crack driving force parameters. However, due to its subsurface nature direct measurement of CTOD is very cumbersome. CTOD is commonly measured using single or double clip gauge techniques and applying a plastic hinge model. However, clip gauge CTOD calculations merely provide information related to the center of the defect. For the case of a finite-length surface breaking defect, where CTOD is variable along the defect front, exact knowledge of CTOD over the entire front is not possible by the clip gauge measurement techniques. In the present paper a novel technique is proposed based on full field three-dimensional profile measurement of the notched surface by means of stereoscopic Digital Image Correlation (3D-DIC) to measure the CTOD over the entire crack front. The proposed method is verified by measurement of silicone replicas cast inside the notch in addition to a supporting Finite Element (FE) investigation.
Keywords
Mechanical Engineering, General Materials Science, Mechanics of Materials

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Citation

Please use this url to cite or link to this publication:

Chicago
Samadian, Kaveh, Stijn Hertelé, and Wim De Waele. 2019. “Measurement of CTOD Along a Surface Crack by Means of Digital Image Correlation.” Engineering Fracture Mechanics 205: 470–485.
APA
Samadian, K., Hertelé, S., & De Waele, W. (2019). Measurement of CTOD along a surface crack by means of digital image correlation. ENGINEERING FRACTURE MECHANICS, 205, 470–485.
Vancouver
1.
Samadian K, Hertelé S, De Waele W. Measurement of CTOD along a surface crack by means of digital image correlation. ENGINEERING FRACTURE MECHANICS. Elsevier BV; 2019;205:470–85.
MLA
Samadian, Kaveh, Stijn Hertelé, and Wim De Waele. “Measurement of CTOD Along a Surface Crack by Means of Digital Image Correlation.” ENGINEERING FRACTURE MECHANICS 205 (2019): 470–485. Print.
@article{8583028,
  abstract     = {The experimental measurement of fracture toughness and crack driving force are the main steps for the application of fracture mechanics methods in structural integrity assessment. Crack Tip Opening Displacement (CTOD), defined as the opening of a defect at its crack front upon loading a test specimen or structure, is one of the most important crack driving force parameters. However, due to its subsurface nature direct measurement of CTOD is very cumbersome. CTOD is commonly measured using single or double clip gauge techniques and applying a plastic hinge model. However, clip gauge CTOD calculations merely provide information related to the center of the defect. For the case of a finite-length surface breaking defect, where CTOD is variable along the defect front, exact knowledge of CTOD over the entire front is not possible by the clip gauge measurement techniques. In the present paper a novel technique is proposed based on full field three-dimensional profile measurement of the notched surface by means of stereoscopic Digital Image Correlation (3D-DIC) to measure the CTOD over the entire crack front. The proposed method is verified by measurement of silicone replicas cast inside the notch in addition to a supporting Finite Element (FE) investigation.},
  author       = {Samadian, Kaveh and Hertel{\'e}, Stijn and De Waele, Wim},
  issn         = {0013-7944},
  journal      = {ENGINEERING FRACTURE MECHANICS},
  language     = {eng},
  pages        = {470--485},
  publisher    = {Elsevier BV},
  title        = {Measurement of CTOD along a surface crack by means of digital image correlation},
  url          = {http://dx.doi.org/10.1016/j.engfracmech.2018.11.015},
  volume       = {205},
  year         = {2019},
}

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