Issue 36

Frattura ed Integrità Strutturale, 36 (2016); International Journal of the Italian Group of Fracture

and either austenitic stainless steels or nickel-based alloys. The numerical simulations were performed using commercial finite element code MSC.Marc, and residual stress measurements were performed on welded joints to validate the simulation results. The validated residual stress distributions can be used for the life time assessment and failure mode predictions of the welded joints. In the paper Scaling Of Compression Strength in Disordered Solids: Metallic Foams, authors J. Kováčik, J. Jerz, N. Mináriková, L. Marsavina, E. Linul, the scaling of compression strength with porosity for aluminium foams was investigated. Three different compositions Al 99.96, AlMg1Si0.6 and AlSi11Mg0.6 foams of various porosity, sample size with and without surface skin were tested in compression. It was observed that the compression strength of aluminium foams scales near the percolation threshold with T f ≈ 1.9 - 2.0 almost independently on the matrix alloy, sample size and presence of surface skin. V. Petrova, S. Schmauder, A. Shashkin in Modeling of edge cracks interaction investigated the effects of the interaction of edge cracks on further crack formation. The solution of singular integral equations is obtained by a numerical method which is based on Gauss-Chebyshev quadrature. The main fracture characteristics, such as, stress intensity factors, fracture angles and critical loads are provided in this study. A series of illustrative examples are presented for different geometries of arbitrarily inclined edge cracks . Paper titled Failure analysis of dissimilar single-lap joints having authors F.A. Stuparu, D.A. Apostol. D.M. Constantinescu, M. Sandu, S. Sorohan investigates the single-lap joints made of aluminium and carbon fibre adherends of different thickness. The experimental tests and the use of 2D Digital Image Correlation were employed in order to understand better the behaviour of such dissimilar joints. The obtained results are suggesting that a complete monitoring of the failure processes in the overlap region can be fully understood only if local deformation measurements are possible. The Special Issue is closed by two papers of T. Fekete Review of Pressurized Thermal Shock Studies of Large Scale Reactor Pressure Vessels in Hungary and Methodological Developments in the Field of Structural Integrity Analyses of Large Scale Reactor Pressure Vessels in Hungary. In the first one presents a comparative review of the methodologies used to investigate pressurized thermal shock which appear in the four nuclear power units from Hungary. The concept of structural integrity was the basis of research and development. The second paper presents in the first part of the paper, a short historic overview with the origins of the Structural Integrity concept are presented, and the beginnings of Structural Integrity in Hungary are summarized. In the second part, a new conceptual model of Structural Integrity is introduced. In the third part, a brief description of the VVER-440 V213 type RPV and its surrounding primary system is presented. In the fourth part, a conceptual model developed for PTS Structural Integrity Analyses is explained.

Aleksandar SEDMAK , University of Belgrade, Serbia Liviu MARSAVINA , University Politehnica Timisoara, Roamnia

VII