عنوان مقاله [English]
نویسندگان [English]چکیده [English]
In this paper an experimental study of the behavior of thin-walled structures carrying explosives, has been considered, The most important part of the research is to determine the effect of strain rate on the range 10-4 to 10+5, on the maximum Deformation of structures. For quasi-static and dynamic loading at low rates (10-4 to 1 (S-1)), the hydrostatic system has been used. And high dynamic loading rates (10+4 to 10 +5 (S-1)) the explosion tests are used. Structures used in the experiments, three millimeters thick aluminum AA1050 with three different lengths of 17 to 34 cm. To ensure the accuracy of the test results conducted three experiments were considered. Finally, amount of pressure required for maximum deformation at different loading conditions, determined and compared. Results show an increase in maximum pressure of the dynamic loading compare to the quasi-static loading, with a ratio of 1.57 to 1.81. Certainly, changes in the behavior of structure, represent the sensitivity of the structural material to the Strain rate loading, this means that an increase in strain rate, causes increase in the yield, Which In this study, the increase in yield stress is fully determined.
 Menkes. S.B., Opat. H.J. 1973. Broken beams: Tearing and Shear failure in explosively loaded clamped beams. Experimental Mechanics 480-486Kluwer Academic Publishers.
 Hodge, P. G. 1955. Impact pressure loading of rigid-plastic cylindrical shells. Journal of the Mechanics and Physics of Solids, 3(3): 176-188.
 Jones, N., and R. M. Walters. 1972. A comparison of theory and experiments on the dynamic plastic behavior of shells. Archives of Mechanics 24 (5-6): 701-14.
 Mackenzie, A., Dalrymple, E. W., and Schwartz. 1965. design of pressure vessels for confining explosives. Mackenzi: piccatinny arsenal dover nj feltman reserch labs.
 Benham, R. A., and Duffey. T. A. 1973. Experimental- Theoretical correlation on the containment of explosions in Closed cylindrical vessels. 4th Int conference of center for High energy Forming Vail. Colorado July 9-13.
 Jones. N. 1989. Structural Impact. U.K: Cambridge UniversityPress.
 Bola, M. S., Madan, A. K., & Singh, M. 1992. Expansion of Metallic Cylinders Under Explosive Loading. Defence Sci. 42 (3): 157-63.
 Singh, M., Suneja, H. R., Bola, M. S., and Prakash, S. 2002. Dynamic Tensile Deformation and Fracture of Metal Cylinders at High Strain rates. International Journal of Impact Engineering 27 (2): 101-159
 Tong Wa Chao, Joseph E., and Shepherd. 2003. Comparison of fracture response of preflowed Tubs under Internal static and dynamic loading. Journal of Pressure Vessel Technology 49: 752-761
 Kuwabara, T., Ishiki. M., Kuroda. M., and Takahashi. S. 2003. Yield locus and work-hardening behavior of a thin-walled steel specimen subjected to combined tension-internal pressure. Journal de Physique IV105: 347–354.
 Martineau, R. L., C. A. Anderson, and F. W. Smith. 2000. Expansion of cylindrical subjected to Internal Explosive Detonation. Los Alamos. NM87545.
 Molyneaux, T. C. K., Li, L. Y., and Firth, N. 1993. Impact responses of circular cylindrical shells under explosive loading. Advances in Engineering Software, 18 (1): 7-13.
 Johnson, G. R., and Cook, W. H. 1983. A constitutive model and data for metals subjected t large strains, high strain rates and high temperatures. Proceedings of the 7th International Symposium on Ballistics, The Hague, The Netherlands, 541-547.
 Perzyna. 1996. Fundamental Problems in Viscoplasticity, Advances in Applied Mechnics. Academic Press 9: 243-377
 Campbell. 1973. Dynamic Palsticity Macroscopic & Microscopic Aspects. Material Science & Eng 12: 3-21.
 Goodman. H.J. 1960. Compiled free-air blast data on bare spherical penttolite, Ballistic Research Laboratories, Aberdeen proving ground, Maryland