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Simple Testing System for Pure Bending Tests with Large Deflections

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Abstract

The potential uses of new materials in structural elements are growing constantly. The focus is on the use of composites with high strengths and strains [1], among other properties. This means that their mechanical properties and failure modes need to be described. Bending tests are widely used for these purposes due to their advantages compared to other types of tests. In particular, pure bending tests are very useful when calculating mechanical parameters and failure modes. These tests do not superimpose different types of loading on the specimens and do not introduce shear stresses which often make the test difficult to carry out properly (for example, in sandwich beams that exhibit great changes in curvature and therefore have a small core thickness). Nonetheless, if long specimens with large allowable strains or curved specimens need to be tested, then traditional bending test methods may fail to apply; making the displacement of support points and load application necessary. This work proposes a pure bending test method that overcomes these disadvantages. It is based on a pulley system which, in addition to introducing the necessary rotations, allows the reduction of the distance between test specimen supports and guarantees pure bending. After the corresponding kinematic study that shows the foregoing, the tests carried out on a test specimen yield uniform characteristics known to confirm the validity of the design.

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References

  1. Miravete A (2000) Materiales Compuestos, Vol. I. Editado por Antonio Miravete. Zaragoza, 2000. ISBN: 8492134976

  2. Mayville RA, Finnie I (1982) Uniaxial stress–strain curves from a bending test. Exp Mech 22(6):197–201

    Article  Google Scholar 

  3. Boers SHA, Geers MGD, Kouznetsova VG (2010) Contactless and frictionless pure bending: principles, equipment and experimental opportunities. Exp Mech 50(6):683–693

    Article  Google Scholar 

  4. Elchalakani M, Zhao XL, Grzebieta RH (2001) Concrete-filled circular steel tubes subjected to pure bending. Journal of Constructional Steel Research: 1141–1468

  5. Calderón R (2010) Experimental research on standard cracking patterns in reinforced concrete members subjected to pure bending. Informes de la Construcción 62:43–56. doi:10.3989/ic.09.030

    Article  Google Scholar 

  6. Levyakov SV (2008) Buckling analysis of flanged curvilinear pipes in pure bending. Pres Ves Pip 85:306–312. doi:10.1016/j.ijpvp.2008.01.001

    Article  Google Scholar 

  7. Layne M, Carlsson L (2002) Test method for measuring strength of a curved sandwich beam. Exp Mech 42(2):194–199

    Google Scholar 

  8. Zineb T, Sedrakian A, Billoet JL (2003) An original pure bending device with large displacements and rotations for static and fatigue tests of composite structures. Composites Part B: Engineering: 447–458

  9. Ellison MS, Corona E (1998) Buckling of T-beams under cyclic bending. Int J Mech Sci 40(9):835–855

    Article  MATH  Google Scholar 

  10. Aguirre F, Kyriakides S, Yun HD (2004) Bending of steel tubes with Lüders bands. Int J Plast: 1199–1225

  11. Hill RG (1959) Pure bending test machine. US patent Nº 3026720

  12. Filatov MY (1989) A machine for fatigue testing of composite materials in pure bending. Plenum Publishing Corporation

  13. Belokurov VN, Pavlovskii VÉ (1999) A machine for fatigue testing under the joint action of pure bending and torque moment. Strength Mater 31(4)

  14. Wisnom MR, Atkinson JW (1997) Constrained buckling test show increasing compressive strain to failure with increasing strain gradient. Composites Part A: 959–964

  15. Ortíz Berrocal L (2007) Resistencia de materiales. Mc Graw Hill, Madrid. ISBN: 9788448156336

  16. Timoshenko S (1956) Strength of materials, part II, advanced theory and problems, 3rd edn. D. Vand Nostrand Company, New York

    Google Scholar 

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Acknowledgements

The authors wish to thank Eduardo Torroja Institute for its help and advice at the time of execution of the tests. Our gratitude as well goes to the company Cuyma S.A., responsible for the production of all the elements which compound the mechanism and to Acumener R&D for the financing offered during the execution of this work. They also thank the reviewers for their helpful suggestions.

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Authors and Affiliations

  1. Mechanical Engineering and Manufacturing Department—E.T.S.I. Industriales, Universidad Politécnica de Madrid, C/José Gutiérrez Abascal, nº 2, 28006, Madrid, Spain

    J. M. Muñoz-Guijosa, V. Rodríguez de la Cruz, D. Fernández Caballero, A. Díaz Lantada & J. Echávarri Otero

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  1. J. M. Muñoz-Guijosa
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  2. V. Rodríguez de la Cruz
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  3. D. Fernández Caballero
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  4. A. Díaz Lantada
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  5. J. Echávarri Otero
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Correspondence to J. M. Muñoz-Guijosa.

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Muñoz-Guijosa, J.M., Rodríguez de la Cruz, V., Fernández Caballero, D. et al. Simple Testing System for Pure Bending Tests with Large Deflections. Exp Mech 52, 679–692 (2012). https://doi.org/10.1007/s11340-011-9535-7

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  • DOI: https://doi.org/10.1007/s11340-011-9535-7

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