A Refined Methodology for Calibrating Premium Connection Make-ups
| dc.contributor.author | Ostergaard, Erik Barr | en |
| dc.contributor.committeechair | West, Robert L. Jr. | en |
| dc.contributor.committeemember | Coe, David H. | en |
| dc.contributor.committeemember | Batra, Romesh C. | en |
| dc.contributor.department | Mechanical Engineering | en |
| dc.date.accessioned | 2013-03-22T08:00:11Z | en |
| dc.date.available | 2013-03-22T08:00:11Z | en |
| dc.date.issued | 2013-03-21 | en |
| dc.description.abstract | Digital Image Correlation is used to generate high-spatial-density full-field displacement<br />and strain data of a connection box outer diameter for use in the calibration of finite element<br />make-up models. Image acquisition and data processing techniques are discussed and best<br />practice recommendations are made. 3D-wedge models consisting of a twenty-degree sweep of<br />the connection geometry are generated from manufacturer supplied profiles. Deformation<br />plasticity material models are developed from identified minimum strength material coupons.<br />Axisymmetric and 3D meshing schemes are used to capture the geometric complexity, supply<br />enough resolution to represent seal performance, and provide a solution in an acceptable<br />timeframe. Several techniques for achieving good contact resolution are presented. The<br />mechanics of the full 3D connection makeup are decomposed into simple idealized<br />representations. Finite element boundary conditions are developed to adequately represent the<br />360-degree make-up mechanics in a wedge section. The wedge model is loaded to achieve a<br />torque-rotation coupling which satisfies the experimental make-up conditions. This model<br />displays a much improved ability to capture box outer diameter strain and displacement fields,<br />and thus better represents the mechanics of a connection make-up. A 3D inspired axisymmetric<br />pretension loading scheme is developed which enables the 3D-wedge seal conditions to be<br />replicated in a computationally efficient axisymmetric form for connection performance<br />evaluation. Seal metrics are developed and converged to evaluate connection sealing capabilities<br />in the power-tight configuration. Modeling error metrics are developed, and the final 3D-wedge<br />model is evaluated relative to the experimental DIC data. | en |
| dc.description.degree | Master of Science | en |
| dc.format.medium | ETD | en |
| dc.identifier.other | vt_gsexam:431 | en |
| dc.identifier.uri | http://hdl.handle.net/10919/19294 | en |
| dc.publisher | Virginia Tech | en |
| dc.rights | In Copyright | en |
| dc.rights.uri | http://rightsstatements.org/vocab/InC/1.0/ | en |
| dc.subject | Oil Country Tubular Goods | en |
| dc.subject | Connection Make-up | en |
| dc.subject | Finite element method | en |
| dc.subject | Digital Image Correlation | en |
| dc.title | A Refined Methodology for Calibrating Premium Connection Make-ups | en |
| dc.type | Thesis | en |
| thesis.degree.discipline | Mechanical Engineering | en |
| thesis.degree.grantor | Virginia Polytechnic Institute and State University | en |
| thesis.degree.level | masters | en |
| thesis.degree.name | Master of Science | en |
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