9 papers
An efficient algorithm for the minimal least squares solution of linear system with indefinite symmetric matrices
Ibai Coria, Gorka Urkullu, Haritz Uriarte +1
In this work, a new algorithm for solving symmetric indefinite systems of linear equations is presented. It factorizes the matrix into the form LDLt using Jacobi rotations in order…
A new methodology for the optimization of bolt tightening sequences for ring type joints
Ibai Coria, Mikel Abasolo, Imanol Olaskoaga +2
Achieving uniform bolt load distribution is critical to obtain leak-free service in pressure vessel gasketed joints used in offshore pipelines. This is a difficult task due to bolt…
Effect of the geometry of butt-joint implant-supported restorations on the fatigue life of prosthetic screws
Mikel Armentia, Mikel Abasolo, Ibai Coria +1
Statement of problem. Dental implant geometry affects the mechanical performance and fatigue behavior of butt-joint implant-supported restorations. However, failure of the implant…
Wire twisting stiffness modelling with application in wire race ball bearings. Derivation of analytical formula and Finite Element validation
Josu Aguirrebeitia, Inigo Martin, Iker Heras +2
Since Erich Franke produced the first wire race bearings in 1934, they have not been used profusely until these last years in applications such as computerized tomography, X-ray ma…
Static structural behaviour of wire bearings: comparison with conventional bearings and study of design and operational parameters
Inigo Martin, Iker Heras, Josu Aguirrebeitia +2
In wire bearings the rolling process occurs on raceways machined on steel wires, and the rings are made of light materials such as aluminium. This particular architecture provides…
Fatigue performance of prosthetic screws used in dental implant restorations: Rolled versus cut threads
Mikel Armentia, Mikel Abasolo, Ibai Coria +2
Statement of problem. Cold rolling is widely used for screw thread manufacturing in industry but is less common in implant dentistry, where cutting is the preferred manufacturing m…