Generolo Jono Žemaičio Lietuvos karo akademija

Using of 3D printed spare parts for Navy supply supported by mentioned inspection meets the requirement for enhancing the logistic performance by provide to military end-users possibilities to produce spare parts using additive manufacturing solutions, particularly in the context of overseas operations, that can be easily presented with several examples. But with application of additive manufacturing in naval operations to product different objects in a variety of materials in an open water environment, we need to start with development of innovative solutions for intelligent inspection of products of selective laser melting from metallic powders is a topic of great importance in nowadays if we talk about real strategies in logistic support including overseas naval outposts support equipment and the reverse engineering of obsolescent parts such as many of those that could be found on the perspective sea platforms with particular focus on maritime littoral and high sea areas—demonstrate advantages of additive manufacturing.

Nowadays there’s still the questions in context of global strategy about prevention and protection of civilian population and critical infrastructure even when in the present doctrine the global powers "forgets" about the old strategy of nuclear warfare. That means that we still should think about retrofit those of underground spaces that was decommissioned in last years and to start thinking about reuse of mining shafts in rock mass as a fallout shelters for protection of civil population. By rock mass we mean the volume of rock necessary to represent a model of the structure of the rocks enclosed in it and determined by a specific task related to the impact of external forces (boundary conditions) on this volume. Currently, there is no universally accepted point of view on the possibility of an approach to the processes of massifs deformation; rocks being under load in various geological conditions from a single common point, the question now arises of creating the most realistic mechanical model of the massif. In this paper were summarizing some mathematical apparatus for rocks mechanical characteristics within the massif loading processes for underground structures model.

The paper contains the results of a non-destructive laser ultrasound internal structure analysis made on specially prepared friction stir welded joints made of aluminum samples. The process was conducted using four different groups of welding parameters. Different tool rotation speeds and tool traverse speeds were used. The main purpose of the research was to analyze the joint quality using a non-destructive laser amplified ultrasound method. A microstructure analysis was also conducted to compare the results of both tests.