Unfortunately, people can’t live in peace in this century: many wars and terrorist attacks have been witnessed even within the last year. In the case of such attacks, both the people and the civil infrastructure is in danger [1-3]. The modern age (infrastructure) provides electrical networks and communication networks for the citizens. Without electricity and/or communications (e.g. the internet), urban life is paralysed. Explosions create heat and shock waves and their effects can potentially damage the wall and cables of a building as changes in the material structure occur. In this article, the authors introduce a blast load effect testing method in an empirical way. The metal microstructure deformation level is measurable by changes in resistance, because resistance is a physical property which depends on the crystal structure of the metal.
 Figuli L., Jangl Š., Papán D.: Modelling and Testing of Blast Effect On the Structures. IOP Conference Series: Earth and Environmental Science, 44/5. (2016).
 Lukács L., Szalay A., Zádor I.: Explosive forming and the aerospace. Repüléstudományi Közlemények, vol. XXIV/2. (2012) 431–446.
 Daruka N.: IEDD – Improvised Explosive Device Disposal. In: International Conference on Military Technologies – ICMT 2013, 383–390 (2013).
 Ashby M. F., Jones D. R. H: Engineering Materials. An Introduction to Properties, Applications and Design. Third Edition, Elsevier 2005. Cambridge, UK P.K.
 Kovács T.: Explosive Surface Hardening of Austenitic Stainless Steel. In: Iop conference series: Materials Science and Engineering 123. (2016) 1–5.
 Ramos M. J. G., et all: Dependence of Electrical Risistivity on Plastic Deformation on Copper-Aluminium Alloy Cu0,975Al0,025. Journal of Metals, Materials and Minerals, 26/2. (2016) 31–36. https://doi.org/10.14456/jmmm.2016.9
 Meyers M. A. Mura E., Staudhammer K. P.: Shockwave and high-strain-rate phenomena in metals.Marcel Dekker Inc., New York, 1992.