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ABSTRACT. The influence of exploitation period and temperature on the fatigue crack growth parameters in different regions of a welded joint is analysed for new and exploited low-alloyed Cr-Mo steel A-387 Gr. B. The parent metal is a part of a reactor mantle which was exploited for over 40 years, and recently replaced with new material. Fatigue crack growth parameters, threshold value K th , coefficient C and exponent m, have been determined, both at room and exploitation temperature. Based on testing results, fatigue crack growth resistance in different regions of welded joint is analysed in order to justify the selected welding procedure specification.

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Original scientific paper Machines aimed for different purposes must be designed taking into account specific shape, type of load and materials they are made of. Nowadays different design solutions can easily be examined by using the finite element method. In this paper an example is given of examining a machine with closed supporting structure, made of iron-concrete, dynamically loaded composite material.Keywords: composite material iron-concrete; dynamic loading; finite element method; supporting structure Analiza noseće konstrukcije alatnog stroja od kompozitnog materijala metodom konačnih elemenata Izvorni znanstveni članak Strojevi različite namjene moraju biti projektirani uzimajući u obzir specifičan oblik, vrstu opterećenja i materijal od kojeg su izrađeni. Različita projektna rješenja danas se mogu lako provjeriti primjenom metode konačnih