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Sensitivity study of crack driving force predictions in heterogeneous welds using Vickers hardness maps

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Abstract
Weld flaws often require an engineering critical assessment (ECA) to judge on the necessity for weld repair. ECA is a fracture mechanics based prediction of the integrity of welds under operating conditions. Adding to the complexity of an ECA is the occurrence of local constitutive property variations in the weldment (‘weld heterogeneity’). Their quantification is important to allow for an accurate assessment. Hereto, hardness measurements are widely adopted given their theoretical relation with ultimate tensile strength. However, various standards and procedures report a wide variety of different hardness transfer functions and additionally recognize substantial scatter in predictions of strength. Within this context, this paper investigates the suitability of hardness mapping to perform an accurate weld ECA. A finite element analysis has been conducted on welds originating from steel pipelines to simulate their crack driving force response using single-edge notched tension (SE(T)) specimens. Vickers hardness maps and hardness transfer functions are combined to assign element-specific constitutive properties to the model. The resulting crack driving force curves are probed against experimental results. The variable agreement between simulations and experiments highlights the need for further research into the characterization of local constitutive properties of heterogeneous welds. A hardness transfer procedure based on all weld metal tensile testing appears to be particularly promising.
Keywords
Vickers hardness, SE(T) specimen., Crack driving force, Weld, Heterogeneity

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Citation

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

Chicago
Naib, Sameera, Koen Van Minnebruggen, Wim De Waele, and Stijn Hertelé. 2016. “Sensitivity Study of Crack Driving Force Predictions in Heterogeneous Welds Using Vickers Hardness Maps.” In International NAFEMS Conference on Engineering Analysis, Modeling, Simulation and 3D-Printing. Bangalore: NAFEMS 3D.
APA
Naib, S., Van Minnebruggen, K., De Waele, W., & Hertelé, S. (2016). Sensitivity study of crack driving force predictions in heterogeneous welds using Vickers hardness maps. International NAFEMS Conference on Engineering Analysis, Modeling, Simulation and 3D-Printing. Presented at the International NAFEMS Conference on Engineering Analysis, Modeling, Simulation and 3D-Printing (NAFEMS-3D – 2016), Bangalore: NAFEMS 3D.
Vancouver
1.
Naib S, Van Minnebruggen K, De Waele W, Hertelé S. Sensitivity study of crack driving force predictions in heterogeneous welds using Vickers hardness maps. International NAFEMS Conference on Engineering Analysis, Modeling, Simulation and 3D-Printing. Bangalore: NAFEMS 3D; 2016.
MLA
Naib, Sameera, Koen Van Minnebruggen, Wim De Waele, et al. “Sensitivity Study of Crack Driving Force Predictions in Heterogeneous Welds Using Vickers Hardness Maps.” International NAFEMS Conference on Engineering Analysis, Modeling, Simulation and 3D-Printing. Bangalore: NAFEMS 3D, 2016. Print.
@inproceedings{8099242,
  abstract     = {Weld flaws often require an engineering critical assessment (ECA) to judge on the necessity for weld repair. ECA is a fracture mechanics based prediction of the integrity of welds under operating conditions. Adding to the complexity of an ECA is the occurrence of local constitutive property variations in the weldment ({\textquoteleft}weld heterogeneity{\textquoteright}). Their quantification is important to allow for an accurate assessment. Hereto, hardness measurements are widely adopted given their theoretical relation with ultimate tensile strength. However, various standards and procedures report a wide variety of different hardness transfer functions and additionally recognize substantial scatter in predictions of strength. Within this context, this paper investigates the suitability of hardness mapping to perform an accurate weld ECA. A finite element analysis has been conducted on welds originating from steel pipelines to simulate their crack driving force response using single-edge notched tension (SE(T)) specimens. Vickers hardness maps and hardness transfer functions are combined to assign element-specific constitutive properties to the model. The resulting crack driving force curves are probed against experimental results. The variable agreement between simulations and experiments highlights the need for further research into the characterization of local constitutive properties of heterogeneous welds. A hardness transfer procedure based on all weld metal tensile testing appears to be particularly promising.},
  author       = {Naib, Sameera and Van Minnebruggen, Koen and De Waele, Wim and Hertel{\'e}, Stijn},
  booktitle    = {International NAFEMS Conference on Engineering Analysis, Modeling, Simulation and 3D-Printing},
  keyword      = {Vickers hardness,SE(T) specimen.,Crack driving force,Weld,Heterogeneity},
  language     = {eng},
  location     = {Bangalore, India},
  publisher    = {NAFEMS 3D},
  title        = {Sensitivity study of crack driving force predictions in heterogeneous welds using Vickers hardness maps},
  year         = {2016},
}