Keyword: «acoustic emission»

The influence of basalt fiber and the type of its laying on the strength properties of a composite material based on fresh ice has been studied. Regularities of damage accumulation in ice composite material are analyzed using the acoustic emission method. The experiments used massive samples obtained under natural conditions by layer-by-layer freezing. It is shown that with a doubling of the filler content, the bending strength of the ice composite increases by 1.5 times, and its durability increases. The scale effect of strength is discussed.

In this work, the influence of the structural state of the ZTV metal of 09G2S pipe steel after welding and heat treatment on the deformation processes during the delayed destruction of an above-ground pipeline under the influence of seasonal soil deformations in the permafrost zone was studied. The influence of the restructuring of the ZTV metal structure from post-welding heat treatment on the strength and ductility characteristics was examined. The deformation and fracture processes during three-point bending were recorded using acoustic emission.

This paper demonstrates the feasibility and necessity of using the acoustic emission method for assessing the process strength of welded joints. The presented improvement of the methods allows real-time monitoring of the kinetics of the occurrence and development of cold cracks in welded joints of high-strength steels during delayed fracture, which undoubtedly improves the level of assessment of the technological strength of welded joints. Using the acoustic emission method, new criteria-based approaches to assessing the process strength of welded joints are proposed, based on appropriate processing of acoustic emission data.