Numerical simulation of energy absorption in polyurethane foams under impact

• Autorzy: Jankowski M. , Czechowski L. , Kotełko M.
• Języki publikacji: EN

Abstrakty

EN

Selection of proper mechanical characteristics of the padding material of the head rest, namely polyurethane foam, is particularly important in the design process of the vehicle seat head restraint. In the paper the code of numerical simulation of flexible polyurethane foam absorber response against impact of a rigid body (passenger's head) is presented. The code is based on the lump mass method. Basics of the numerical algorithm based on this method are presented. Material constitutive model of flexible polyurethane foam (FPF) derived on the basis of former experimental tests and used in the algorithm is described. Comparative results of numerical simulations together with results of experiments carried out on drop hammer rig with flat impact or are shown. The results are presented on diagrams of deceleration versus time. Also comparative Finite Element simulations are carried out. The FE simulation was performed using the implicit analysis, taking into account the multi-linear, hyper-elastic material model and large strain (non-linear geometric relations). The influence of damping coefficient on the deceleration characteristics was investigated. Some final conclusions concerning the applicability of the numerical code based on the lump mass method, as well as its advantages in comparison with the FE software are derived.

Słowa kluczowe

EN

polyurethane foams; energy absorption; lump mass method; finite element method

• Wydawca: Łukasiewicz Research Network - Institute of Aviation ; European Science Society of Powertrain and Transport KONES Poland ; Wydawnictwo Instytutu Technicznego Wojsk Lotniczych
• Czasopismo: Journal of KONES
• Rocznik: 2012
• Tom: Vol. 19, No. 4
• Strony: 245--252
• Opis fizyczny: Bibliogr. 10 poz., rys.

Twórcy

autor

Jankowski M.

autor

Czechowski L.

autor

Kotełko M.

• INTAP - Producer of Bus Seats,

Bibliografia

• [1] European Directive 74/408/EEC – Relating to motor vehicles with regards to the seats, their anchorages and head restraints.
• [2] Muser, M. F., et. al., Trauma Biomechanics. Accidental Injury in Traffic and Sports. Springer, 2007.
• [3] Jach, K., Komputerowe modelowanie dynamicznych oddziaływań ciał metodą punktów swobodnych, PWN, Warszawa 2001.
• [4] Shim, V. P. W., et. al., A Lumped Mass Numerical Model for Cellular Materials Deformed by Impact, International Journal for Numerical Methods in Engineering, Vol. 50, pp. 2459-2488, 2001.
• [5] Frost, C. C., Sherwood, J. A., Constitutive Modelling and Simulation of Energy Absorbing Polyurethane Foam Under Impact Loading, Polymer Engineering and Science, Vol. 32, No. 16, 1992.
• [6] Ashby, M. F., Gibson, L. J., Cellular solids. Structure and properties – Second Edition. Cambridge University Press, 1997.
• [7] Kotełko, M., Jankowski, M., Doświadczalna identyfikacja związków fizycznych w piankach poliuretanowych, Przegląd Mechaniczny, No. 4, 2010.
• [8] Jankowski M., Kotełko M.. Dynamic Compression Tests of a Polyurethane Flexible Foam as a Step in Modelling Impact of the Head to the Vehicle Seat Head Restraint, FME Transactions, Belgrade, 2010.
• [9] Jankowski, M., Absorpcja energii uderzenia w układzie: poliuretanowy zagłówek siedzenia – głowa pasażera., Rozprawa doktorska, 2011.
• [10] Kotełko, M., Jankowski, M., Experimentally Aided Numerical Model of the Head to the Vehicle Seat Head Restraint Impact, 27th Danubia Adria Symposium, Wrocław, 2010.