The in situ ply elasticity and strength in laminated composites
Authors: Oleinikov A.I., Kuzmina T.A.
Published in issue: #7(103)/2020
DOI: 10.18698/2308-6033-2020-7-1996
Category: Aviation and Rocket-Space Engineering | Chapter: Design, construction and production of aircraft
When calculating thin-walled structures made of layered polymer composite materials (PCM), data obtained as data obtained from testing a corresponding separately cured unidirectional sheet is accepted as the elastic-strength characteristics of their monolayers. Properties of such sheet significantly differ from the characteristics of the monolayer polymerized and working together with adjacent layers of different orientations as part of a composite package. The article presents the results of solving the problem of determining the elastic and strength characteristics of monolayers according to the data of direct tensile — compression tests of PCM samples from witness parts. It considers PCM which monolayers have similar or diverse characteristics. Formulas are given for calculating the mechanical properties of monolayers as part of a multidirectional composite package. Comparison of calculation results with test data is carried out. The use of the actual characteristics of monolayers makes it possible to calculate the real behavior of the PCM in the structure, to link its verification and design calculations.
References
[1] Chang F.K., Chen M.H. The in-situ ply shear strength distribution in graphite/epoxy laminated composites. J. Compos. Mater., 1987, vol. 21, pp. 708–733.
[2] Dávila C.G., Camanho P.P. Failure Criteria for FRP Laminates in Plane Stress. NASA/TM-2003-212663, 01-11, 2003, 28 р.
[3] Sihn S., Kim R.Y., Kawabe K., Tsai S. Experimental studies of thin-ply laminated composites. Composites Science and Technology, 2007, vol. 67, pp. 996–1008.
[4] Amacher R., Cugnoni J., Botsis J. Thin ply composites: experimental characterization and modeling. In: The 19th International Conference on Composite Materials. July 28 to August 2, 2013, Montréal, Canada. Concordia Centre for Composites, Department of Mechanical and Industrial Engineering, Concordia University, 2013, pp. 4364–4376.
[5] Fikry M.J.M., Ogihara S., Vinogradov V. Effect of matrix cracking on mechanical properties in FRP angle-ply laminates. In: ECCM 2018 — 18th European Conference on Composite Materials, A. M. L., 25‒28 June, 2018, Athens, Greece. Applied Mechanics Laboratory. ISBN (Electronic) 9781510896932, 2020, pp. 793–812.
[6] Isupov L.P. Mashinovedenie — Machine Science, 1979, no. 4, pp. 66–70.
[7] Alfutov N.A., Zinoviev P.A., Tairova L.P. Identifikatsiya uprugikh kharakteristik odnonapravlennogo materiala po rezul’tatam ispytaniy mul’tinapravlennogo kompozita [Identification of the elastic characteristics of a unidirectional material from the test results of a multidirectional composite]. Raschety na prochnost [Strength calculations], vol. 30. Moscow, Mashinostroenie Publ., 1989, pp. 16–31.
[8] Tairova L.P., Smerdov A.A. Prochnost’ odnonapravlennogo sloya vnutri mnogosloynykh paketov s razlichnymi skhemami armirovaniya [Strength of a unidirectional layer inside multilayer packages with different reinforcement schemes]. In: Deformirovaniye i razrusheniye kompozitsionnykh materialov i konstruktsiy [Deformation and destruction of composite materials and structures]. Moscow, IMASH RAS, 2014, p. 20.
[9] Kayumov R.A., Lukankin S.A., Paymushin V.N., Kholmogorov S.A. Uchenyye zapiski Kazan. un-ta — Scientific notes Kazan. University, 2015, vol. 157, b. 4, Phys.-Math. Sc., pp. 112–132.
[10] Catalanotti G. Prediction of in situ strengths in composites: some considerations. Composite Structures, 2019, vol. 207, pp. 889–893.
[11] Oleinikov A.I., Kuzmina T.A. Uchenye zapiski TsAGI — TsAGI Science Journal, 2020, vol. LI, no. 4, pp. 87‒98.
[12] Rabotnov Yu.N. Izvestiya AN SSSR, MTT — the USSR Academy of Sciences Bulletin. Mech. Solids, 1979, no. 1, pp. 113–119.
[13] Oleinikov A.I. Uchenye zapiski TsAGI — TsAGI Science Journal, 2018, vol. XLIХ, no. 8, pp. 78‒88.
[14] Oleinikov A.I. Uchenye zapiski TsAGI — TsAGI Science Journal, 2019, vol. L, no. 4, pp. 53–66.
[15] Grishin V.I., Dzyuba A.S., Dudarkov Yu.I. Prochnost’ i ustoychivost’ elementov i soyedineniy aviatsionnykh konstruktsiy iz kompozitov [Strength and stability of elements and joints of aviation structures made of composites]. Moscow, Fizmatlit Publ., 2013, 272 p.