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Article: Structural Potting of Large Aeronautic Honeycomb Panels: End-Effector Design and Test for Automated Manufacturing.

Campos, Carlos / Casarejos, Enrique / Segade, Abraham

2022 Volume 15, Issue 19

Abstract: Structural potting is used to prepare honeycomb panels to fix metallic elements, typical in aircraft doors. In this paper, a full procedure for structural potting using robotic arms is presented for the first time. Automating this procedure requires the ... ...

Abstract	Structural potting is used to prepare honeycomb panels to fix metallic elements, typical in aircraft doors. In this paper, a full procedure for structural potting using robotic arms is presented for the first time. Automating this procedure requires the integration of, first, machining operations to remove the skin layers and prepare the potting points and, then, resin injection into the honeycomb cells. The paper describes the design, prototyping, and testing of specific end-effectors. Different end-effectors were explored to ensure efficient injection. The results obtained with the prototypes show that the potting quality is adequate to accomplish the required process checks for industrial manufacturing. The injection process time can be reduced by a factor greater than 3.5, together with the extra assets associated with the automation of complex tasks. Therefore, structural potting automation is demonstrated to be feasible with the end-effectors proposed for milling and injection, which are ready for use with conventional robotic arms in manufacturing lines.
Language	English
Publishing date	2022-09-26
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2487261-1
ISSN	1996-1944
ISSN	1996-1944
DOI	10.3390/ma15196679
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: Evaluation of an FE Model for the Design of a Complex Thin-Wall CFRP Structure for a Scientific Instrument.

Casarejos, Enrique / Riol, Jose C / Lopez-Campos, Jose A / Segade, Abraham / Vilan, Jose A

Materials (Basel, Switzerland)

2019 Volume 12, Issue 3

Abstract: In this paper, the reliability of a finite element (FE) model including carbon-fibre reinforced plastics (CFRPs) is evaluated for a case of a complex thin-wall honeycomb structure designed for a scientific instrument, such as a calorimeter. Mechanical ... ...

Abstract	In this paper, the reliability of a finite element (FE) model including carbon-fibre reinforced plastics (CFRPs) is evaluated for a case of a complex thin-wall honeycomb structure designed for a scientific instrument, such as a calorimeter. Mechanical calculations were performed using FE models including CFRPs, which required a specific definition to describe the micro-mechanical behaviour of the orthotropic materials coupled to homogeneous ones. There are well-known commercial software packages used as powerful tools for analyzing structures; however, for complex (many-parts) structures, the models become largely time consuming for both definition and calculation, which limits the appropriate feedback for the structure's design. This study introduces a method to reduce a highly nonlinear model, including CFRPs, into a robust, simplified and realistic FE model capable of describing the deformations of the structure with known uncertainties. Therefore, to calculate the deviations of our model, displacement measurements in a reduced mechanical setup were performed, and then a variety of FE models were studied with the objective to find the simplest model with reliable results. The approach developed in this work leads to concluding that the deformations evaluated, including the uncertainties, were below the actual production tolerances, which makes the proposed model a successful tool for the designing process. Ultimately, this study serves as a future reference for complex projects requiring intensive mechanical evaluations for designing decisions.
Language	English
Publishing date	2019-02-05
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2487261-1
ISSN	1996-1944
ISSN	1996-1944
DOI	10.3390/ma12030489
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: Finite Element Simulation for Analysing the Design and Testing of an Energy Absorption System.

Segade, Abraham / López-Campos, José A / Fernández, José R / Casarejos, Enrique / Vilán, José A

Materials (Basel, Switzerland)

2016 Volume 9, Issue 8

Abstract: It is not uncommon to use profiles to act as energy absorption parts in vehicle safety systems. This work analyses an impact attenuator based on a simple design and discusses the use of a thermoplastic material. We present the design of the impact ... ...

Abstract	It is not uncommon to use profiles to act as energy absorption parts in vehicle safety systems. This work analyses an impact attenuator based on a simple design and discusses the use of a thermoplastic material. We present the design of the impact attenuator and a mechanical test for the prototype. We develop a simulation model using the finite element method and explicit dynamics, and we evaluate the most appropriate mesh size and integration for describing the test results. Finally, we consider the performance of different materials, metallic ones (steel AISI 4310, Aluminium 5083-O) and a thermoplastic foam (IMPAXX500™). This reflects the car industry's interest in using new materials to make high-performance, low-mass energy absorbers. We show the strength of the models when it comes to providing reliable results for large deformations and strong non-linearities, and how they are highly correlated with respect to the test results both in value and behaviour.
Language	English
Publishing date	2016-08-05
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2487261-1
ISSN	1996-1944
ISSN	1996-1944
DOI	10.3390/ma9080660
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Article ; Online: Evidence for a New Compact Symmetric Fission Mode in Light Thorium Isotopes.

Chatillon, A / Taïeb, J / Alvarez-Pol, H / Audouin, L / Ayyad, Y / Bélier, G / Benlliure, J / Boutoux, G / Caamaño, M / Casarejos, E / Cortina-Gil, D / Ebran, A / Farget, F / Fernández-Domínguez, B / Gorbinet, T / Grente, L / Heinz, A / Johansson, H T / Jurado, B /

Kelić-Heil, A / Kurz, N / Laurent, B / Martin, J-F / Nociforo, C / Paradela, C / Pellereau, E / Pietri, S / Prochazka, A / Rodríguez-Sánchez, J L / Rossi, D / Simon, H / Tassan-Got, L / Vargas, J / Voss, B / Weick, H

Physical review letters

2020 Volume 124, Issue 20, Page(s) 202502

Abstract: Taking benefit of the R3B/SOFIA setup to measure the mass and the nuclear charge of both fission fragments in coincidence with the total prompt-neutron multiplicity, the scission configurations are inferred along the thorium chain, from the asymmetric ... ...

Abstract	Taking benefit of the R3B/SOFIA setup to measure the mass and the nuclear charge of both fission fragments in coincidence with the total prompt-neutron multiplicity, the scission configurations are inferred along the thorium chain, from the asymmetric fission in the heavier isotopes to the symmetric fission in the neutron-deficient thorium. Against all expectations, the symmetric scission in the light thorium isotopes shows a compact configuration, which is in total contrast to what is known in the fission of the heavier thorium isotopes and heavier actinides. This new main symmetric scission mode is characterized by a significant drop in deformation energy of the fission fragments of about 19 MeV, compared to the well-known symmetric scission in the uranium-plutonium region.
Language	English
Publishing date	2020-05-26
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.124.202502
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Article ; Online: Design and construction of the structure of the DEMONSTRATOR of the CALIFA detector for R3B-FAIR using carbon-fiber composites

Casarejos E. / Alvarez-Pol H. / Cortina-Gil D. / Durán I. / Iglesias A. / Izquierdo P. / Yañez P. / Vilán J.A.

EPJ Web of Conferences, Vol 66, p

2014 Volume 11038

Abstract: In this paper we describe the DEMONSTRATOR structures and active units (PETALs) developed for the detector CALIFA of the experiment R3B - FAIR. The design is based in the CALIFA BARREL mechanical solutions, but adapted to the characteristics of the ... ...

Abstract	In this paper we describe the DEMONSTRATOR structures and active units (PETALs) developed for the detector CALIFA of the experiment R3B - FAIR. The design is based in the CALIFA BARREL mechanical solutions, but adapted to the characteristics of the PETALs, namely in what concerns the load distribution during setup and service. The R&D program defined the materials and procedures for both producing the pieces of carbon fiber (CF) composites as well as the mounting of the bundles to make an alveolar structure. The procedures also include a quality control program to ensure the dimensional properties of the CF assemblies. We are also developing the use of tomographic imaging analysis for this quality program, that will be of mayor interest in the construction of the future CALIFA CF-structure.
Keywords	Physics ; QC1-999 ; Science ; Q
Language	English
Publishing date	2014-03-01T00:00:00Z
Publisher	EDP Sciences
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: The mechanical design of the BARREL section of the detector CALIFA for R3B-FAIR.

Casarejos E. / Alvarez-Pol H. / Cortina-Gil D. / Durán I. / Izquierdo P. / Yañez P. / Vilán J.A.

EPJ Web of Conferences, Vol 66, p

2014 Volume 11037

Abstract: In this work we present the mechanical concept proposed for one of the sections of the detector CALIFA of the R3B experiment for FAIR. The use of an alveolar structure made of carbon-fiber composites allows for a light and robust solution to hold the ... ...

Abstract	In this work we present the mechanical concept proposed for one of the sections of the detector CALIFA of the R3B experiment for FAIR. The use of an alveolar structure made of carbon-fiber composites allows for a light and robust solution to hold the active elements with an extreme mass ratio below 0.7%. The active core is supported by structural elements designed to make a fully operational assembly, taking care of different configurations and functionality. All the design has been developed using intensive calculation based in finite elements models and physical simulations.
Keywords	Physics ; QC1-999 ; Science ; Q
Language	English
Publishing date	2014-03-01T00:00:00Z
Publisher	EDP Sciences
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Investigating the dynamics of fission with low-fissility highly-excited nuclei

Benlliure J. / Ayyad Y. / Boudard A. / Casarejos E. / Enqvist T. / Farget F. / Kurtukian T. / Leray S. / Fernández M. / Nadtochy P. / Pérez D. / Pleskac R. / Ricciardi M.V. / Schmidt K.-H. / Schmitt C.

EPJ Web of Conferences, Vol 62, p

2013 Volume 06004

Abstract: Total fission cross sections and charge distributions of the final fission fragments have been measured at GSI in inverse kinematics for the reactions 208Pb + p,d at 500 A MeV and 182Ta + p at 300, 500, 700 and 1000 A MeV. These data are used to ... ...

Abstract	Total fission cross sections and charge distributions of the final fission fragments have been measured at GSI in inverse kinematics for the reactions 208Pb + p,d at 500 A MeV and 182Ta + p at 300, 500, 700 and 1000 A MeV. These data are used to investigate dissipative and transient effects at low deformation and its possible dependences with temperature and fissility.
Keywords	Physics ; QC1-999 ; Science ; Q ; DOAJ:Physics (General) ; DOAJ:Physics and Astronomy
Language	English
Publishing date	2013-12-01T00:00:00Z
Publisher	EDP Sciences
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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Article ; Online: Towards the Limits of Existence of Nuclear Structure: Observation and First Spectroscopy of the Isotope ^{31}K by Measuring Its Three-Proton Decay.

Kostyleva, D / Mukha, I / Acosta, L / Casarejos, E / Chudoba, V / Ciemny, A A / Dominik, W / Dueñas, J A / Dunin, V / Espino, J M / Estradé, A / Farinon, F / Fomichev, A / Geissel, H / Gorshkov, A / Grigorenko, L V / Janas, Z / Kamiński, G / Kiselev, O /

Knöbel, R / Krupko, S / Kuich, M / Litvinov, Yu A / Marquinez-Durán, G / Martel, I / Mazzocchi, C / Nociforo, C / Ordúz, A K / Pfützner, M / Pietri, S / Pomorski, M / Prochazka, A / Rymzhanova, S / Sánchez-Benítez, A M / Scheidenberger, C / Simon, H / Sitar, B / Slepnev, R / Stanoiu, M / Strmen, P / Szarka, I / Takechi, M / Tanaka, Y K / Weick, H / Winkler, M / Winfield, J S / Xu, X / Zhukov, M V

Physical review letters

2019 Volume 123, Issue 9, Page(s) 92502

Abstract: The most remote isotope from the proton dripline (by 4 atomic mass units) has been observed: ^{31}K. It is unbound with respect to three-proton (3p) emission, and its decays have been detected in flight by measuring the trajectories of all decay products ...

Abstract	The most remote isotope from the proton dripline (by 4 atomic mass units) has been observed: ^{31}K. It is unbound with respect to three-proton (3p) emission, and its decays have been detected in flight by measuring the trajectories of all decay products using microstrip detectors. The 3p emission processes have been studied by the means of angular correlations of ^{28}S+3p and the respective decay vertices. The energies of the previously unknown ground and excited states of ^{31}K have been determined. This provides its 3p separation energy value S_{3p} of -4.6(2) MeV. Upper half-life limits of 10 ps of the observed ^{31}K states have been derived from distributions of the measured decay vertices.
Language	English
Publishing date	2019-09-19
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.123.092502
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: Alpha:2n:alpha molecular band in 10Be.

Freer, M / Casarejos, E / Achouri, L / Angulo, C / Ashwood, N I / Curtis, N / Demaret, P / Harlin, C / Laurent, B / Milin, M / Orr, N A / Price, D / Raabe, R / Soić, N / Ziman, V A

Physical review letters

2006 Volume 96, Issue 4, Page(s) 42501

Abstract: The 10.15 MeV resonance in 10Be has been probed via resonant 6He+4He elastic scattering. It is demonstrated that it is the Jpi=4+ member of a rotational band built on the 6.18 MeV 0+ state. A Gammaalpha of 0.10-0.13 MeV and Gammaalpha/Gamma=0.35-0.46 ... ...

Abstract	The 10.15 MeV resonance in 10Be has been probed via resonant 6He+4He elastic scattering. It is demonstrated that it is the Jpi=4+ member of a rotational band built on the 6.18 MeV 0+ state. A Gammaalpha of 0.10-0.13 MeV and Gammaalpha/Gamma=0.35-0.46 were deduced. The corresponding reduced alpha width, gamma2alpha, indicates one of the largest alpha-cluster spectroscopic factors known. The deformation of the band, including the 7.54 MeV, 2+ member, is large (h2/2I=200 keV). Such a deformation and the significant degree of clusterization signals a well-developed alpha:2n:alpha molecular structure.
Language	English
Publishing date	2006-02-03
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.96.042501
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Investigating the fission process at high excitation energies through proton induced reactions on 181Ta

Paradela C. / Leray S. / Kezzar K. / Kelic A. / Föhr V. / Enqvist T. / Boudard A. / Bacquias A. / Pol H. Álvarez / Casarejos E. / Benlliure J. / Ayyad Y. / Pérez-Loureiro D. / Pleskac R. / Tarrío D.

EPJ Web of Conferences, Vol 8, p

2010 Volume 07011

Abstract: In this work we have investigated total fission cross section of 181Ta+1H at FRS (FRagment Separator -GSI) at 1, 0.8, 0.5 and 0.3 GeV with an specific setup, providing high accuracy measurements of the cross section values. We compare the results ... ...

Abstract	In this work we have investigated total fission cross section of 181Ta+1H at FRS (FRagment Separator -GSI) at 1, 0.8, 0.5 and 0.3 GeV with an specific setup, providing high accuracy measurements of the cross section values. We compare the results obtained in this experiment, with several calculations performed with the intra-nuclear cascade model (INCL v4.1) coupled to de-excitation code (ABLAv3p), according to two different models describing fission process at high-excitation energies: statistical model of Bohr and Wheeler and the dynamical description of the fission process. The comparison with data of previous experiments is also discussed in order to address the existing discrepancies with this new results.
Keywords	Physics ; QC1-999 ; Science ; Q ; DOAJ:Physics (General) ; DOAJ:Physics and Astronomy
Language	English
Publishing date	2010-10-01T00:00:00Z
Publisher	EDP Sciences
Document type	Article ; Online
Database	BASE - Bielefeld Academic Search Engine (life sciences selection)

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