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Andrés Díaz-Gomez,Mytzy Godoy,María Elizabeth Berrio,Jesús Ramirez,Andrés Felipe Jaramillo,Carlos Medina,Mary Montaño,Manuel Francisco Meléndrez 한국섬유공학회 2022 Fibers and polymers Vol.23 No.7
In this study, a polymerized polyurethane foam was formulated from tannins extracted from Pinus radiata aspolyol, and copper oxide nanoparticles (CuO-NPs) at a concentration of 2 % w/w as a nucleating agent. This produced areinforced foam with better mechanical properties and fire resistance. The impact of the addition of CuO-NPs on themechanical and thermal properties of the tannin foam was also studied. The properties studied were foaming process, foamdensity, cell morphology, flammability and thermal conductivity. The results revealed that the CuO-NPs incorporated in thefoam formulation act as nucleation centers, which decrease the pore size, strengthen the cell walls, and improve mechanicalproperties. The tannin samples showed good thermal resistance performance with a limit oxygen index (LOI) higher than21 %. The results obtained were contrasted with two foams, a commercial foam (SoudaFoam) and a foam generated with thesame dissociate, but with a commercial polyol (LHT-112). The foam with NPs had an elastic modulus of 3.7 MPa and stress(max) of 1.13 MPa, which was higher than those of the foams used as controls.
Fixtureless Inspection of Deformable Parts Using Partial Captures
Andrés Jaramillo,Flavio Prieto,Pierre Boulanger 한국정밀공학회 2013 International Journal of Precision Engineering and Vol. No.
A general scheme to validate the shape of a deformable part consists in performing a non-rigid alignment between measurements on the part’s surface with its CAD model. In many algorithms, this process requires the acquisition of a complete model of the inspected part, including regions near its fixation points. This paper proposes a system to perform inspection without the need to digitize the entire part’s surface or regions near fixation points. This algorithm uses instead of standard fixation points, surface feature points to compute the non-rigid transformation. Various tests on real parts show that a reduction of up to 58% of the RMS deviation in less than 3 iterations can be obtained using a single view of the part’s surface.