Nondestructive Testing Of Products Research Articles

Virtual reality as a tool for training specialists in the field of radiation non-destructive testing

Organizational, technical and methodological approaches to the creation and application of virtual reality in additional education are considered. Particularly for use and development of a digital radiography simulator in non-destructive testing of products and materials. It is noted that virtual reality technologies are most widely used in training and knowledge testing of engineering and technical personnel and workers in production, as well as in technological preparation during complex and exacting operations, including products and materials testing. The pilot solutions obtained and tested to date allow us to evaluate the results of complex scientific research. The prospects of expanding the applicability range of software and hardware virtual reality solutions, including those based on network interfaces, protocols and telecommunications solutions, are determined.

Отечественные сканеры вихретокового контроля элементов бурильных труб нефтегазовой отрасли

Composite materials appear to be an ideal solution to a complex problem with conflicting conditions: how to simultaneously obtain sufficient strength, reliability and durability of the structure, while providing the minimum possible mass of it. However, non-destructive testing of products from them raises more and more questions. In the mass production of composite pipes for pipelines, the only possible option from the point of view of ensuring the necessary reliability, information capacity of the results of the performed inspection of products and productivity is the automation of the inspection process, which includes special methods for identifying defects. Statistical methods, including capability ratio and Shewhart control charts, should be used to estimate the error in determining the size of defects.

Автоматизация неразрушающего контроля композиционных материалов

Composite materials appear to be an ideal solution to a complex problem with conflicting conditions: how to simultaneously obtain sufficient strength, reliability and durability of the structure, while providing the minimum possible mass of it. However, non-destructive testing of products from them raises more and more questions. In the mass production of composite pipes for pipelines, the only possible option from the point of view of ensuring the necessary reliability, information capacity of the results of the performed inspection of products and productivity is the automation of the inspection process, which includes special methods for identifying defects. Statistical methods, including capability ratio and Shewhart control charts, should be used to estimate the error in determining the size of defects.

RESEARCH AND IMPROVEMENT OF NONCONTACTING TECHNIQUE OF THE ULTRASONIC THROUGH TRANSMISSION METHOD OF NON-DESTRUCTIVE TESTING

Operation capabilities of ultrasonic through transmission method of non-destructive testing of products from polymeric composite materials and multilayer glued structures are considered. It is shown that for detection of defects in products from easily damaged materials, from the hydroscopic materials which are not allowing wetting by liquids, in designs with rough surface, and also for detection of the under surface defects which are not revealed by contact methods, effective use of ultrasonic through transmission noncontacting method. The calculation procedure and designing of ultrasonic through transmission noncontacting probes on the frequency of 200 kHz, allowing to reveal defects in products from polymeric composite materials and in multilayer glued structures with higher sensitivity, than noncontact ultrasonic probes applied now on frequencies 20, 40 and 80 kHz is offered. The constructive scheme of the vibrator with two piezoelectric plates from ceramics TsTS-19, included inphase, with the metal lap playing role of wave guide, and matching layer from foam plastic is provided. It is specified that two piezoelectric plates works in “short circuit” mode therefore sound pressure piezoelectric plates increases by acoustic line twice, and oscillation strength four times.

A Betatron Tomograph for Nondestructive Testing of Products with a Diameter up to 1000 mm Made of High-Energy Materials

Results of developing and testing a betatron-based tomograph with an energy of up to 10 MeV are presented. The tomograph allows investigating objects with a shined-though thickness of up to 250 mm in steel equivalent. In contrast to foreign analogs, a horizontal product arrangement is used; it creates the most favorable conditions for revealing such defects as cracks and delaminations, since in this position, the product is subjected to small deformations due to gravitational forces. The proposed scanning scheme has the properties of a third-generation tomograph and preserves the quality of the tomogram and the time it is gathered with a reduced number of detectors and tomograph dimensions. The results of evaluating the tomograph sensitivity with a test sample and the results of testing products containing defects are provided.

Data measurement system for non-destructive quality testing of hard alloys

Introduction. It is known that the quality of products from sintered hardmetals, if the fabrication technique is not violated, is determined by the phase composition and an average grain size of the carbide phase. However, hard alloys have a disadvantage inherent in all products of powder metallurgy - the inhomogeneity of the structure and the corresponding variation of properties. Traditional methods of monitoring the structure and phase composition according to the results of selective destructive tests prevent from receiving quality data under the production conditions and do not guarantee the identity of the properties of all batch products under study. The major method of non-destructive quality control of hard alloys is coercimetry, but domestic coercimeters are currently not produced. In this regard, the work objective is to create a domestic data measurement system for non-destructive quality testing of hard alloys and an assessment of the reliability of the results obtained with its help. Materials and Methods. Cylindrical and spherangular rods with the diameter of 4 to 10 mm, made of alloys of VK8 and VK10HOM grades, were used in the work. The method of comparison with a certified product was used to determine the coercitive force in the data measuring system. Research Results. The coercive force of two batches of products from hard alloys of VK10HOM and VK8 grades was measured using the developed data measuring system and KOERZIMAT 1.097 HcJ coersimeter. Discussion and Conclusions. The experimental studies show that the values of the coercitive force of the samples obtained on different equipment have approximately the same level. The inhomogeneity of the structure characteristic of sintered hardmetals being a fabrication technique effect is confirmed. Providing that the relative error of measuring the coercitive force for each sample should be within ± 6%, the results obtained can be considered satisfactory. It is shown that the measurement algorithm proposed and implemented in the data measurement system through comparing the characteristics of the tested and certified samples with the known coercitive force, allows the manufacturer of hard alloy products to expand the sample of inspected products up to 100%, and to significantly reduce the costs for non-destructive testing of products.

The analysis of methods effectiveness of automated non-destructive testing of products based on Data Mining methods

Purpose of the study: the analysis of the effectiveness of automated nondestructive testing methods within the objectives of data clustering on the use of short-wave electromagnetic radiation in flaw detection. Research methods: Kohonen self-organizing maps (SOM). The relevance of the work is that due to the increased demand for quality and reliability of products are becoming increasingly important physical methods for automated control of metals and products thereof that do not require cutting or fracture specimens of finished productes. The article noted common features of methods of short-wave electromagnetic control of products. The effectiveness of the Data Mining approach to the construction of a hypothesis on the interrelationships of data groups on non-destructive testing of products is substantiated. As an instrument, the method of self-organizing Kohonen maps was chosen. An example of a part of training data and neural network configuration parameters performing the task of visualization and clustering is given. It is concluded about the lead electromagnetic methods of automated control of complex products in production. The resulting distance matrix and the cluster map are shown. An example of applying the results of analysis to the problem of testing spot welded joints is considered. Given the further directions of research is to develop a computer image processing techniques in the framework of automated non-destructive testing systems.

Data traffic filtration of automated non-destructive testing based on an artificial neural network

The principle of constructing a universal software and hardware platform for the collection, processing and storage of data obtained as a result of non-destructive testing of products is considered. The platform also includes a neural network module for filtering data traffic, which has a wide potential for application: from image and multidimensional signal processing to data classification. The system of remote leakage control, built on the basis of a universal digital platform with artificial neural network, is described.

Macroscopic criteria for the deformation and fracture of iron based alloys

In the article the deformation of different steels is analyzed using the autowave theory of plasticity. The article considers the possible use of an autowave model to formulate criteria for the structural strength of materials and elastic-plastic transition. The time and place of future fracture for steel samples are shown can be predicted before visible necking takes place by using the kinetic dependencies of localized plasticity domains at the prefracture stage. The results show that during elastic-plastic transition in lowcarbon steel, there is the break of the curve for the ultrasound velocity versus deformation, which can serve as an acoustic criterion of irreversible deformation for the pressure treatment of metals, the operation and nondestructive testing of products and structures.

A laser ultrasonic technique for studying the properties of products manufactured by additive technologies

Study of the possibility for using a laser ultrasonic technique in nondestructive testing of products that are manufactured by selective laser melting is presented. Procedures of producing samples and carrying out nondestructive testing by the laser ultrasonic technique are described. Mechanical properties of samples that were grown in vertical and horizontal directions have been measured, as well as the speed of ultrasound in these samples. It has been established that the laser-ultrasonic technique is a promising technology for the quality control of products that are obtained by selective laser melting.

A spatiotemporal picture of the acoustic field of elastic-wave diffraction at the edge of a crack

With a Doppler ultrasonic laser interferometer, we have visualized the features of the spatiotemporal structure of the acoustic field near a crack with a small width of opening and a spatial location not allowing its detection by traditional techniques of acoustic nondestructive testing. The obtained result can be used in development of new techniques to detect cracks and microcracks of different kinds by nondestructive testing of products and units.

Method of Information Processing in High-Rate Nondestructive Testing

A new method of the information processing in nondestructive testing of products is developed. The method makes it possible to increase the ratio of the informative signal and the noise by more than 12 times. A variant of the device to realize the method developed is proposed. Using the method permits to upgrade the quality of the subsequent digital processing of the information, simplify the equipment of the flaw detector, and reduce its cost.

Some theoretical aspects of estimation of damage to products by using acoustic emission signals

We conceptually discuss the methodological aspects of the application of the phenomenon of acoustic emission to the diagnostics and non-destructive testing of products and their elements and units and offer approaches to the theoretical and experimental study of the interrelation of parameters of acoustic emission signals with the characteristics of nucleation and propagation of crack-like defects. We propose to use new techniques for determination of the coordinates of defects, their geometrical size, and their orientation in real constructions on the basis of the results of research and the new technical means developed for realization of these techniques. Prospects of the application of these techniques to non-destructive testing and technical diagnostics of products at the stage of their manufacture, when starring tests, and during operation are justified.

Intellectual system of image processing and recognition of abnormals in nondestructive testing of products from polymef-composition materials

Intellectual system of image processing and recognition of abnormals in nondestructive testing of products from polymef-composition materials