2014
|
Bruland, M.; Schmid, V.; Ehrlich, I. Analyzing and Testing of a Single Solution of Self-cutting Thread Inserts in Composites. Leichtbau Proceedings Article In: Ziemann, O.; Mottok, J.; Pforr, J. (Ed.): Applied Research Conference 2014 – ARC 2014, pp. 286–288, Shaker-Verlag, 2014, ISBN: 978-3844028751. @inproceedings{Bruland2014,
title = {Analyzing and Testing of a Single Solution of Self-cutting Thread Inserts in Composites.},
author = {M. Bruland and V. Schmid and I. Ehrlich},
editor = {O. Ziemann and J. Mottok and J. Pforr},
isbn = {978-3844028751},
year = {2014},
date = {2014-06-01},
booktitle = {Applied Research Conference 2014 – ARC 2014},
pages = {286--288},
publisher = {Shaker-Verlag},
abstract = {This paper gives a summary of the analysis and the testing of a single solution of self-cutting thread inserts in semi-manufactured composites for shape cutting. The used composites and inserts are for commercial use. As composites are not designed for drilling and withstanding internal compressive stress, there are some challenges involved when attempting to place an insert. },
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
This paper gives a summary of the analysis and the testing of a single solution of self-cutting thread inserts in semi-manufactured composites for shape cutting. The used composites and inserts are for commercial use. As composites are not designed for drilling and withstanding internal compressive stress, there are some challenges involved when attempting to place an insert. |
Fritz, B.; Schmid, V.; Ehrlich, I. Analytical and numerical shear stress analysis of adhesive structural bonded joints under tension load. Leichtbau Proceedings Article In: Ziemann, O.; Mottok, J.; Pforr, J. (Ed.): Applied Research Conference 2014 – ARC 2014, pp. 266–271, Ostbayerische Technische Hochschule Regensburg Shaker-Verlag, 2014, ISBN: 978-3844028751. @inproceedings{Fritz2014,
title = {Analytical and numerical shear stress analysis of adhesive structural bonded joints under tension load.},
author = {B. Fritz and V. Schmid and I. Ehrlich},
editor = {O. Ziemann and J. Mottok and J. Pforr},
isbn = {978-3844028751},
year = {2014},
date = {2014-06-01},
booktitle = {Applied Research Conference 2014 – ARC 2014},
pages = {266--271},
publisher = {Shaker-Verlag},
organization = {Ostbayerische Technische Hochschule Regensburg},
abstract = {Force transmission is a critical zone in the construction of technical components, especially if these contain parts of fibre-reinforced plastics. The aim of this research is to improve and enhance the force transmission for a structural tubular adhesive bonded joint under axial load. Therefore a finite element model is being developed to compare different analytical calculation approaches. First investigations are based on a geometric simple single lap joint with an adhesive layer of epoxy resin. This model is examined analytical for several different calculation approaches, especially Volkerson and Goland & Reissner. The analytical results are compared to finite element analysis, particulary for shear stress distribution and the shear stress concentration factor. As a next step, the experience for the single lap joint is transferred for the calculation of tubular adhesive lap joints. Just as like for single lap joints, analytical approaches (Pugno) are investigated and the results compared to finite element analysis. Special interest is attended to disagreements and simplifying assumptions analytic models have to assume. In these cases finite element analysis (FEA) can deliver results that correlate more precise in analysis for actual shear stresses. In this paper special focus is placed on the shear stress distribution over length and width of the adhesive layer and the influence of the shear-stress-concentration factor. Furthermore, other parameters (geometry, stiffness, material) that have influence on the stress distribution are analyzed and evaluated in future investigations.},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
Force transmission is a critical zone in the construction of technical components, especially if these contain parts of fibre-reinforced plastics. The aim of this research is to improve and enhance the force transmission for a structural tubular adhesive bonded joint under axial load. Therefore a finite element model is being developed to compare different analytical calculation approaches. First investigations are based on a geometric simple single lap joint with an adhesive layer of epoxy resin. This model is examined analytical for several different calculation approaches, especially Volkerson and Goland & Reissner. The analytical results are compared to finite element analysis, particulary for shear stress distribution and the shear stress concentration factor. As a next step, the experience for the single lap joint is transferred for the calculation of tubular adhesive lap joints. Just as like for single lap joints, analytical approaches (Pugno) are investigated and the results compared to finite element analysis. Special interest is attended to disagreements and simplifying assumptions analytic models have to assume. In these cases finite element analysis (FEA) can deliver results that correlate more precise in analysis for actual shear stresses. In this paper special focus is placed on the shear stress distribution over length and width of the adhesive layer and the influence of the shear-stress-concentration factor. Furthermore, other parameters (geometry, stiffness, material) that have influence on the stress distribution are analyzed and evaluated in future investigations. |
Hoinkes, C.; Romano, M.; Ehrlich, I.; Höcherl, J.; Gebbeken, N. Investigation of fibre reinforced plastics with monolithic and hybrid stacking sequences under high-velocity impact loads. Leichtbau Proceedings Article In: Ziemann, O.; Mottok, J.; Pforr, J. (Ed.): Applied Research Conference 2014 – ARC 2014, Shaker-Verlag, 2014, ISBN: 978-3844028751. @inproceedings{Hoinkes2014,
title = {Investigation of fibre reinforced plastics with monolithic and hybrid stacking sequences under high-velocity impact loads.},
author = {C. Hoinkes and M. Romano and I. Ehrlich and J. Höcherl and N. Gebbeken},
editor = {O. Ziemann and J. Mottok and J. Pforr},
isbn = {978-3844028751},
year = {2014},
date = {2014-06-01},
booktitle = {Applied Research Conference 2014 – ARC 2014},
publisher = {Shaker-Verlag},
abstract = {This study deals with the experimental investigation concerning the energy dissipation capacity of reinforcement fibres in monolithic and hybrid layups, with and without a separating layer, under high-velocity impact loads. The investigated kinds of fibres are carbon, glass and basalt fabrics in a twill 2/2 construction. The test panels have been impregnated with the same thermoset resin. Curing was done by autoclave processing. The resulting fibre volume content of the test panels have been determined both analytically by weighting and experimentally by chemical extraction and calcination. The impact loadwas applied by accelarating bearing balls with weighted propellant in a sabot. The measured values are the velocities of the bearing balls as the impactor before and after the penetration of the test panels. The results show the energy sissipation capacity of each single kind of fibre in the monolithic layups as well as the enhanced properties of the hybrid stacked layups.},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
This study deals with the experimental investigation concerning the energy dissipation capacity of reinforcement fibres in monolithic and hybrid layups, with and without a separating layer, under high-velocity impact loads. The investigated kinds of fibres are carbon, glass and basalt fabrics in a twill 2/2 construction. The test panels have been impregnated with the same thermoset resin. Curing was done by autoclave processing. The resulting fibre volume content of the test panels have been determined both analytically by weighting and experimentally by chemical extraction and calcination. The impact loadwas applied by accelarating bearing balls with weighted propellant in a sabot. The measured values are the velocities of the bearing balls as the impactor before and after the penetration of the test panels. The results show the energy sissipation capacity of each single kind of fibre in the monolithic layups as well as the enhanced properties of the hybrid stacked layups. |
Romano, M.; Hoinkes, C.; Ehrlich, I.; Höcherl, J.; Gebbeken, N. Experimental investigation of energy dissipation properties of fibre reinforced plastics with hybrid layups under high-velocity impact loads. Leichtbau Journal Article In: Journal of Achievements in Materials and Manufacturing Engineering (JAMME), vol. 64, no. 1, pp. 14–20, 2014. @article{Romano2014b,
title = {Experimental investigation of energy dissipation properties of fibre reinforced plastics with hybrid layups under high-velocity impact loads.},
author = {M. Romano and C. Hoinkes and I. Ehrlich and J. Höcherl and N. Gebbeken},
url = {http://jamme.acmsse.h2.pl/vol64_1/6411.pdf},
year = {2014},
date = {2014-05-01},
journal = {Journal of Achievements in Materials and Manufacturing Engineering (JAMME)},
volume = {64},
number = {1},
pages = {14--20},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
Valentino, P.; Sgambitterra, E.; Furgiuele, F.; Romano, M.; Ehrlich, I.; Gebbeken, N. Mechanical characterization of basalt woven fabric composites: numerical and experimental investigation. Leichtbau Journal Article In: Frattura ed Integrità Strutturale (Fracture and Structural Integrity), vol. 8, no. 28, pp. 1-11, 2014, ISSN: 1971-8993. @article{Valentino2014,
title = {Mechanical characterization of basalt woven fabric composites: numerical and experimental investigation.},
author = {P. Valentino and E. Sgambitterra and F. Furgiuele and M. Romano and I. Ehrlich and N. Gebbeken},
url = {http://www.gruppofrattura.it/ors/index.php/fis/article/view/1229
http://www.gruppofrattura.it/ors/index.php/fis/article/view/1229/1182
http://www.gruppofrattura.it/ors/index.php/fis/article/download/1229/1182
},
doi = {10.3221/IGF-ESIS.28.01},
issn = {1971-8993},
year = {2014},
date = {2014-04-08},
journal = {Frattura ed Integrità Strutturale (Fracture and Structural Integrity)},
volume = {8},
number = {28},
pages = {1-11},
abstract = {Basalt fabric composite, with different twill wave reinforcements, i.e. twill 2/2 and twill 1/3, have been studied in this work by means of experimental tests and numerical finite element (FE) simulations. As fabric reinforcements show repeating undulations of warp and fill yarn, simple mixtures law cannot be applied. As a consequence, the mesoscopic scale, lying between the microscopic and the macroscopic one, has to be taken into account to mechanically characterize a fabric reinforced composite. The aim of this work is to evaluate the stiffness of a fabric reinforced composite in warp and fill direction. In particular a numerical FE model, assuming elliptical sections and sinusoidal shape of the yarns, has been implemented and experimental tests have been carried out in order to validate the proposed model. Finally, the strength and the failure modes of the composite material, for each analysed structure and textile orientation, have been experimentally investigated.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Basalt fabric composite, with different twill wave reinforcements, i.e. twill 2/2 and twill 1/3, have been studied in this work by means of experimental tests and numerical finite element (FE) simulations. As fabric reinforcements show repeating undulations of warp and fill yarn, simple mixtures law cannot be applied. As a consequence, the mesoscopic scale, lying between the microscopic and the macroscopic one, has to be taken into account to mechanically characterize a fabric reinforced composite. The aim of this work is to evaluate the stiffness of a fabric reinforced composite in warp and fill direction. In particular a numerical FE model, assuming elliptical sections and sinusoidal shape of the yarns, has been implemented and experimental tests have been carried out in order to validate the proposed model. Finally, the strength and the failure modes of the composite material, for each analysed structure and textile orientation, have been experimentally investigated. |
