Documents published in Scipedia

• Materials for large length fibre-based ships. Characterization, selection, and numerical analysis

  J. Jurado Granados

  Open Access Repository of the FIBRESHIP project (2020). 6

  
  

  Abstract

  Fourth dissemination action for university students for increasing the interest in the use of fibre-reinforced polymers for large-length vessels design and shipbuilding in the future naval architects and marine engineers. This presentation was held at the School of Naval Architecture and Ocean Engineering (ETSINO) of the Technical University of Madrid on the 1st of October of 2019. In this presentation, the process of materials selection for marine applicactions and the numerical models for characterizing and predicting the fatigue and failure of such materials were introduced.

  Abstract
  Fourth dissemination action for university students for increasing the interest in the use of fibre-reinforced polymers for large-length vessels design and shipbuilding in [...]

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• Numerical tools for the design of fibre-based ships of large lengths

  J. Jurado Granados

  Open Access Repository of the FIBRESHIP project (2020). 4

  
  

  Abstract

  First dissemination action for university students at the School of Naval and Ocean Engineering (ETSINO) of Cartagena University (UPCT) with the intention of increasing the interest of the students and future engineers and naval architects in the use of composite materials for the design and shipbuilding of large-length vessels. In this presentation, the numerical models developed for predicting the fatigue and failure of composite materials were showed. Besides, the new numerical tools to design and anayze fiber-based ships of large length were introduced, specifically a coupled seakeeping-FEA tool, a new graphical user interface (GUI) for materials definition, hull girder analysis and collapse assesemt.

  Abstract
  First dissemination action for university students at the School of Naval and Ocean Engineering (ETSINO) of Cartagena University (UPCT) with the intention of increasing the [...]

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• Numerical Simulation of Fatigue in Composites

  J. Jurado Granados, X. Martinez, D. Di Capua, L. Barbu

  Presentations at Congresses and Seminars (2018). 1

  
  

  Abstract

  For the past several years, composite marine structures have been designed but without having a complete characterization the composite materials. The main reason is due to the large quantity of variables that affect the behavior of said materials. One of the tasks that has not been properly characterized is the behavior of composite structures under fatigue loads that appear in marine structures that are subjected to cyclic loads. Therefore, numerical tools that characterize fatigue performance are required in order to design more reliable structures. The formulation proposed in this work is based on the Serial/Parallel Rule of Mixtures [1] and a fatigue damage model [2]. The Serial/Parallel Rule of Mixtures can be understood as a constitutive law manager that provides the response of the composite from the constitutive performance of its constituents. Therefore, the constitutive laws chosen to represent the behavior of each constituent material have to fit with their real performance. Also, the fatigue damage model is based on the use of a reduction function which takes into account the cyclic degradation of the materials, both strength and stiffness degradation, in function of the number of cycles, maximum stress and stress amplitude. Current work presents a numerical tool developed to characterize fatigue in composites. The fatigue behavior of constituent materials is defined using mechanic parameters taken from literature. Afterwards, a reproduction of the tests will be done in order to validate the fatigue formulation proposed. [1] Car, E., Oller, S., Oñate, E. "Estudio del comportamiento no lineal en materiales compuestos", Techincal Report 264,CIMNE, 1997. [2] Oller, Salomon, O., Oñate, E. “A continuum mechanics model for mechanical fatigue analysis", Composite Materials Science, Vol 32, Issue 2, pp 175-195, 2005.

  Abstract
  For the past several years, composite marine structures have been designed but without having a complete characterization the composite materials. The main reason is due to [...]

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• Numerical and experimental procedure for material calibration using the serial/parallel mixing theory, to analyze different composite failure modes

  J. Jurado Granados, X. Martinez, N. Nash, C. Bachour, . Ioannis, A. Comer, D. Di Capua

  Joel Jurado's journal papers (2019). 1

  
  

  Abstract

  This work proposes a calibration procedure to obtain the material parameters required by the Serial/Parallel Mixing Theory for the analysis of composites. A set of experimental tests are defined to obtain the main composite failure modes. Then, it is proposed to calculate the parameters required by the formulation using the experimental results. The procedure proposed is validated by comparing the numerical results, with those obtained from the experimental campaign. This comparison shows that the Serial/Parallel mixing theory is capable of representing the failure modes of the composite for different loading scenarios as well as the material toughness.

  Abstract
  This work proposes a calibration procedure to obtain the material parameters required by the Serial/Parallel Mixing Theory for the analysis of composites. A set of experimental [...]

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• Fatigue Simulation of a fibre-glass ship

  Presentations on Computational Methods in Naval Architecture and Offshore Engineering (2019). 5

  
  

  Abstract

  The use of composite materials to build marine structures is a fact. Prove of it is the construction of offshore turbines, military vessels, composite risers, etc. However, the characterization of such structures under fatigue loads is not well understood, what implies a larger scantling and safety ratios of the structures. Hence, it is necessary to develop numerical tools in order to predict this failure mode. The purpose of this work is to propose a numerical model for the analysis of the fatigue behaviour of marine structures made of composite laminates, which can be used to understand their behaviour in order to optimize them. The formulation proposed to simulate the fatigue phenomena is based on the Serial/Parallel Rule of Mixtures (S/P RoM) and a fatigue damage model previously developed for metals. The SPRoM can be understood as a constitutive law manager that provides the elastic and non-linear response of the composite from the constitutive performance of its constituent materials. The fatigue damage model is based on the definition of a reduction function which takes into account the cyclic degradation of the materials, acting on strength and stiffness; this function accounts for the number of cycles, maximum stress and stress amplitude. These two formulations are coupled applying the fatigue damage model to both composite components, fibre and matrix. Current work uses the numerical procedure developed to characterize fatigue in composites. The model is calibrated based on the assumption that the failure mechanism of longitudinal loaded UD laminates is fibre-driven, while the failure mechanism of transverse loaded UD laminates is matrix-driven. The composite resulting from this calibration is used, afterwards, to predict the fatigue performance laminated composites with different stacking sequences. The structure chosen for this analysis is a substructure of a fibreglass vessel. This work is in the scope of FibreShip Project H2020.

  Abstract
  The use of composite materials to build marine structures is a fact. Prove of it is the construction of offshore turbines, military vessels, composite risers, etc. However, [...]

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• Procedure to Calibrate Composite Materials by Serial/Parallel Mixing Theory

  J. Jurado Granados

  Presentations on Computational Methods in Naval Architecture and Offshore Engineering (2019). 6

  
  

  Abstract

  The use of composite materials in the naval industry is a fact. Prove of it is composite materials are widely used in the marine industry (e.g. competition vessels and leisure boats), offshore industry and renewable energy industry. If engineers want to design reliable structures made of composites, the numerical tools have to be capable of accurately representing the behaviour of these materials, such as their high anisotropy and non-linear performance. Hence, a good model capable of taking into account the different failure modes of the laminates is required in order to reduce the uncertainty associated with the simulation of composite structures. There are many models capable of simulating the elastic and specific non-linear behaviour of laminates, while also accounting for their anisotropic behaviour. However, few of them are capable to take into account most of the composites failure modes in a general way. This work proposes using one of them, the Serial/Parallel Mixing Theory (SP RoM) [1]. The main advantage of the SP RoM versus other formulations is that the composite performance is obtained from the mechanical properties of its constituent materials. Therefore, once these are calibrated, different composite configurations can be analysed without further calibrations. The Serial/Parallel Mixing Theory (S/P RoM) acts as a constitutive law manager of the constituent materials, being capable of reproducing the composite performance in its linear and non-linear regime. In order to obtain the material parameters required by the formulation, this work proposes a set of different tests to obtain different loading conditions and failure modes. Then, a guideline to get the material parameters from the tests is given. Finally, the numerical results are compared with results obtained from an experimental campaign. These results show that, once all the material parameters are obtained for fibre and matrix, the formulation introduced is capable of representing all the failure modes of the composite for different loading conditions, as well as their failure strength. This work is in the scope of FibreShip Project H2020 [2]. REFERENCES [1] F. Rastellni, S. Oller, O. Salomon, E. Oñate Composite materials non-linear modelling for long fibre reinforced laminates: continuum basis, computational aspects and validations, Computers & Structures, 86 (9) (2008), pp. 879–896 [2] European Union’s Horizon 2020 research and innovation programme under grant agreement nº 723360 “Engineering, production and life-cycle management for the complete construction of large-length FIBRE-based SHIPs”. http://www.fibreship.eu/about

  Abstract
  The use of composite materials in the naval industry is a fact. Prove of it is composite materials are widely used in the marine industry (e.g. competition vessels and leisure [...]

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