Issue 33

R. Sepe et alii, Frattura ed Integrità Strutturale, 33 (2015) 451-462; DOI: 10.3221/IGF-ESIS.33.50 462 simulated again under the same conditions for the second stage. As a result of the modifications, the roof module structure with better static strength properties was obtained. 2. The maximum static stress in the members of the modified roof structure and relative maximum displacement are less than the prescribed allowable limits. 3. The maximum stress under fatigue loading in the members are less than the prescribed allowable limits. 4. The smallest linear buckling eigenvalues was high enough to consider adequately safe the considered roof structure. 5. The free vibration analysis shows that the first natural frequency is 50.81 Hz that is remarkably highest of the value of 12 Hz. R EFERENCES [1] UNI EN 12663-1 Railway applications - Structural requirements of railway vehicle bodies - Part 1: Locomotives and passenger rolling stock (and alternative method for freight wagons). UNI, (2010). [2] UNI EN 12663-2 Railway applications - Structural requirements of railway vehicle bodies - Part 2: Freight wagons. UNI, (2010). [3] UIC leaflet 577 ‘Wagon Stresses’ UIC, (2005). [4] ERRI B12/RP 17, ‘Wagons’, European Rail Research Institute, (1993). [5] Kirkpatrick, S.W., Schroeder, M., Simons, J.W., Evaluation of passenger rail vehicle crashworthiness, International Journal of Crashworthiness, 6(1) (2001) 95-106. [6] Lewis, J.H., Rasaiah, W.G., Scholes, A., Validation of Measures to Improve Rail Vehicle Crashworthiness, Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit, 210 (1996) 73-85. [7] Hosseini-Tehrani, P., Bayat, V., Study on crashworthiness of wagon's frame under frontal impact, International Journal of Crashworthiness, 16(1) (2011) 25-39. [8] Caputo, F., Lamanna, G., Fidanza, F., Interior’s safety in a regional train unit, In: 7 th International Symposium on PASSIVE SAFETY 2008 Innovation in Passive Safety and Interior Design, IFV BAHNTECHNIK, (2008). [9] Caputo, F., Lamanna, G., Fidanza, F., Multibody investigation on the passive safety performances of seats in railway vehicles”, In: Proceedings of the 10 th Biennial Conference on Engineering Systems Design and Analysis ESDA2010 , Istanbul, Turkey, (2010). [10] Caputo, F., Lamanna, G., Soprano, A., FE dynamic analysis of a railway seat under longitudinal impact condition, In: Proceedings of the International Mechanical Engineering Congress & Exposition IMECE2011, Denver, Colorado, USA , (2011). [11] Lamanna, G., Sepe, R., Performance evaluation of CFRP-rubber shock absorbers”, In: AIP Conference Proceedings, 1599 (2014) 342-345. [12] Sepe, R., Armentani, E., Pozzi, A., Development and stress behaviour of an innovative refrigerated container with pcm for fresh and frozen goods, Multidiscipline Modeling in Materials and Structures, 11(2) (2015).