Technology for Determining the Residual Life of Metal Structures Under Conditions of Combined Loading According to Acoustic Emission Measurements

An acoustic emission method for assessing the degree of degradation of mechanical properties under conditions of complex dynamic deformation stresses is proposed. It has been shown that changing the operating conditions of metal structures, peak loads, external collisions, and thermally changing loads, which cannot be taken into account, leads to uncertainty and unpredictable structural changes in the material. This in turn makes it difficult to identify the state of the structure material to ensure trouble-free operation of the equipment. Changes in the mechanical properties under difficult loading conditions are identified by polynomial approximation of the results of AE measurements and the construction of boundary curves separating the operability region from the fracture region. This is achieved by approximating the experimental dependences of the acoustic parameters for various types of loading. This approach significantly expands the capabilities of the technical means of identification systems of metal structures, and in particular, allows the current state of the equipment and its suitability for further operation to be assessed without stopping the equipment in real time. It is of interest not only to fix the damage, but also to diagnose the processes of reducing the mechanical properties during the operation of the equipment.

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“…The analytical safety factor λ for point A on curve 2 in Figure 7 is described by formula [ 58 ]:

…”

Section: Resultsmentioning

confidence: 99%

An Acoustic Emission Method for Assessing the Degree of Degradation of Mechanical Properties and Residual Life of Metal Structures under Complex Dynamic Deformation Stresses

2021

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“…Among the applications of the AE method for SHM the following can be mentioned; detection of friction [17], detection of friction and the presence of wear in bearings (bearings, roller bearings) due to improper functioning of grease or lubricant, detection of impact in rotating mechanisms due to excessive looseness of the bearing that causes impact [18,19], detection of turbulence in the inspection of tanks under it is the pressure that the presence of excessive leakage causes turbulent flow [20], detection of defects in manufactured parts [21,22], detection of defects in welding [23] and estimation of the life of the structure [24,25]. Also, this method can be used to reveal and locate partial voltage discharges in large transformers [26], research and investigate the properties and characteristics of materials [27], geology [28,29] and research on micro-vibrations [30].…”

Section: Acoustic Emission Methodsmentioning

confidence: 99%

Application of Acoustic Emission to Detect Damage in Composites Materials

Mohammadi Esfarjani

2024

Fiber-Reinforced Composites - Recent Advances, New Perspectives and Applications

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In today’s modern world, the use of composite in the construction of various equipment and parts due to many advantages such as; weight reduction, design durability, flexibility, etc., is increasing. Damages may occur unintentionally in composite materials, either during the manufacturing process or during the normal lifetime of the part. Structural health monitoring (SHM) of composite structures is an industry requirement. The acoustic emission method can be used as an effective nondestructive testing (NDT) method to continuously monitor the development of damages in composites. In this chapter of the book, it has been prepared with the aim of application of AE to detect damage in composites. For this purpose, the literature done in the field of SHM of composite structures using the AE method is reviewed. The content of this chapter shows the importance of using the AE method for SHM of composite structures.

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“…Determination of the residual life of metal structures using the phenomenon of acoustic emission (AE) is presented in [ 6 ]. In [ 7 ], the AE method was used to assess the degradation of mechanical properties under complex deformation effects, in [ 8 , 9 ] the method was used to assess the safety factor using AE and fractal data analysis.…”

Section: Introductionmentioning

confidence: 99%

The Theory of Similarity and Analysis of Dimensions for Determining the State of Operation of Structures under Difficult Loading Conditions

et al. 2022

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A simulation mathematical model of the state of operability of metal structures under difficult operating conditions without stopping the equipment was developed in the form of similarity criteria found on the basis of the laws of conservation of data obtained experimentally during tensile and four-point bending tests. Criteria are proposed for the similarity of the state of the material of the samples and the products in service, in which the kinetics of destruction are determined through the rate of damage accumulation and the movement of the structural components of the material. The residual life of the equipment under conditions of complex deformation effects was determined based on the theory of similarity and the analysis of the dimensions of the parameters of acoustic emission in real time. The use of concepts and models of fracture mechanics when creating methods and criteria for assessing the results of diagnostics and monitoring allows important information about the technical state of objects to be obtained.

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Technology for Determining the Residual Life of Metal Structures Under Conditions of Combined Loading According to Acoustic Emission Measurements

Cited by 6 publications

References 21 publications

An Acoustic Emission Method for Assessing the Degree of Degradation of Mechanical Properties and Residual Life of Metal Structures under Complex Dynamic Deformation Stresses

An Acoustic Emission Method for Assessing the Degree of Degradation of Mechanical Properties and Residual Life of Metal Structures under Complex Dynamic Deformation Stresses

Application of Acoustic Emission to Detect Damage in Composites Materials

The Theory of Similarity and Analysis of Dimensions for Determining the State of Operation of Structures under Difficult Loading Conditions

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