Abstract
Assessment of the mechanical properties of structural steels characterizing their strength and deformation parameters is an essential problem in the monitoring of structures that have been in operation for quite a long time. The properties of steel can change under the influence of loads, deformations, or temperatures. There is a problem of express determination of the steel grade used in structures—often met in the practice of civil engineering or machinery manufacturing. The article proposes the use of artificial neural networks for the classification and clustering of steel according to strength characteristics. The experimental studies of the mechanical characteristics of various steel grades were carried out, and a special device was developed for conducting tests by shock indentation of a conical indenter. A technique based on a neural network was built. The developed algorithm allows with average accuracy—over 95%—to attribute the results to the corresponding steel grade.
Highlights
The problem of assessing the mechanical characteristics of structural steels is an important task in engineering, construction, and other industries
The conical indenter hits on the examined steelelement
If Step 3 classified the sample to the violet class, take Step 4; If the result from Step 4 classified the sample to grey class, the class of steel is 4 195 HB with 42+6 = 87.5% confidence
Summary
The problem of assessing the mechanical characteristics of structural steels is an important task in engineering, construction, and other industries. Often in the construction site or manufacturing process, it is necessary to determine the grade of steel for subsequent processing. In the tasks of monitoring both the life and the safety of a structure, determining the strength class allows predicting reliability, especially if the structure has been working for a long time. The resistance of materials to the action of the external factors is characterized not by the only one, but by a set of mechanical properties, which determines the strength, deformability, reliability, and quality of the structures. A set of the most important mechanical characteristics can be defined as the yield strength and ultimate strength of steel, elongation, and hardness. The task of Materials 2020, 13, 2445; doi:10.3390/ma13112445 www.mdpi.com/journal/materials
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