Journal articles: 'Nondestructive and destructive testing'

1

Cherepanov, Anatoliy. "EVALUATION OF NONDESTRUCTIVE TESTING RESULTS." Scientific Papers Collection of the Angarsk State Technical University 2021, no. 1 (July 5, 2021): 67–76. http://dx.doi.org/10.36629/2686-7788-2021-1-1-67-76.

Full text

Abstract:

The issues of assessing the volume and efficiency of non–destructive testing in order to improve the quality and completeness of information for determining the degradation processes that cause the destruction of technical devices, for automating data processing, for determining time, labor and cost, taking into account the volume, efficiency and labor intensity.

APA, Harvard, Vancouver, ISO, and other styles

2

Holčapek, Ondřej, Jiří Litoš, and Jan Zatloukal. "Destructive and Nondestructive Characteristics of Old Concrete." Advanced Materials Research 1054 (October 2014): 243–47. http://dx.doi.org/10.4028/www.scientific.net/amr.1054.243.

Full text

Abstract:

This paper aims at determination of mechanical properties of 28 years old concrete with various nondestructive and destructive testing methods. All investigated parameters were determined on drilled cores with diameter 79.8 mm gained from existing bridge. On these samples Schmidt rebound testing and destructive force loading test were performed. Static (from loading test) and dynamic (measured by ultrasonic device) modulus of elasticity was also measured. The evaluation of destructive and nondestructive testing was according to the Czech Standards. Testing of old concrete from real structures is important especially prior to the reconstruction, strengthening or repair of the structure, when the structural engineer needs to know the characteristics. The compressive strength measured destructively on cylinders achieved average value 28 MPa, while the Schmidt rebound hammer test showed strength 44 MPa. The average value of static modulus of elasticity was 26 GPa.

APA, Harvard, Vancouver, ISO, and other styles

3

Boutros, C. P., M. Kasra, M. D. Grynpas, and D. R. Trout. "The Effect of Repeated Freeze-thaw Cycles on the Biomechanical Properties of Canine Cortical Bone." Veterinary and Comparative Orthopaedics and Traumatology 13, no. 02 (2000): 59–64. http://dx.doi.org/10.1055/s-0038-1632632.

Full text

Abstract:

SummaryAs orthopaedic investigations have become more intricate, bone specimens have sometimes undergone multiple freeze-thaw cycles prior to biomechanical testing. The purpose of this study was to determine if repeated freezing and thawing affected the mechanical properties of canine cortical bone. Six pairs of third-metacarpal bones were tested in three-point bending and six pairs of femurs were tested in torsion. At the time of collection, one member of each pair was tested destructively. The other member was tested nondestructively at the time of collection and after each of five freeze-thaw cycles, followed by destructive testing after the fifth cycle. For destructive tests, the material properties (modulus, maximum stress, maximum strain and absorbed energy) of a specimen at the time of collection were compared to those of the corresponding contralateral specimen that had undergone five freeze-thaw cycles. For repeated nondestructive tests, the modulus of a specimen at the time of collection was compared to modulus of the same specimen at each of the five thaw intervals. During destructive testing, there was a significant (p = 0.02) decrease (20%) in maximum torsional strain. Other changes in bending and torsional destructive properties were not statistically significant. During repeated nondestructive testing, there were solitary significant (p < 0.05) increases (8% and 9%, respectively) in both bending and torsional modulus. However, these isolated changes were not correlated to the number of freeze-thaw cycles. The pattern of alterations in destructive and non-destructive biomechanical properties was most consistent with varying specimen dehydration at each thaw interval. Despite using accepted methods to maintain specimen hydration, repeated freezing, thawing, handling and testing of cortical bone increased the risk of moisture loss. Unless stringent efforts are made to ensure proper hydration, the mechanical properties of canine cortical bone will be altered by repeated freezing and thawing, affecting the results of studies utilizing this technique.The effect of five freeze-thaw cycles on paired canine cortical bone specimens was evaluated using destructive and repeated non-destructive three-point bending and torsion tests. A significant decrease in destructive torsional strain and isolated significant increases in nondestructive bending and torsional modulus were most consistent with varying specimen dehydration at each thaw interval.

APA, Harvard, Vancouver, ISO, and other styles

4

Ibrahim, Yasser E., Nabil Al-Akhras, and Walid Al-Kutti. "Destructive and Nondestructive Testing on Silica Fume Concrete." Advanced Materials Research 919-921 (April 2014): 1890–93. http://dx.doi.org/10.4028/www.scientific.net/amr.919-921.1890.

Full text

Abstract:

Factors such as poor design, bad workmanship and a harsh environment can combine to cause deterioration within a concrete structure leading to visually unacceptable surface cracking or spalling of concrete cover [. In aggressive environments, corrosion of steel reinforcing bars is responsible for major deteriorations in concrete structures. Reduction in bar diameter leads to a lower resistance, which can result in brittle failure of the bar. Initiation and progression of reinforcing steel corrosion can lead to progressive weakening of the structure due to damage accumulation over a period of time, or in sudden catastrophic failures, such as the Berlin Congress Hall, a parking garage in Minnesota [. Antonaci et al. [ conducted an experimental study on different concrete cylinders damaged in compression followed by means of linear and nonlinear ultrasonic methods. Arndt et al. [ tested a concrete slab representing typical bridge decks in order to evaluate the ability of NDT methods to detect different phases of corrosion progression in concrete. Reinforced concrete beam-shaped samples were tested by Aveldano and Ortega [ in order to characterize concrete cracking due to reinforcing corrosion under different environments. Shah and Ribakov [ performed nonlinear ultrasonic testing of cubic concrete specimens with different frequency transducers. Al-Amoudi et al. [ investgated the relatioship between compressive strength of ordinary concrete and blended cement concrete with durability propeties of concrete samples and conculded that the addition of blended cement will improve the performance of concrete in ressiting corrosion of reinforcement. The main objective of this study is to investigate the effectiveness of using nondestructive testing to assess the performance of different types of concrete such as OPC and SFC. Also, to correlate different types of nondestructive testing and to investigate the possibility of capturing the occurrence of corrosion in reinforcing bars in concrete.

APA, Harvard, Vancouver, ISO, and other styles

5

Ngo, Loan T. Q., Yu-Ren Wang, and Yi-Ming Chen. "Applying Adaptive Neural Fuzzy Inference System to Improve Concrete Strength Estimation in Ultrasonic Pulse Velocity Tests." Advances in Civil Engineering 2018 (September 20, 2018): 1–11. http://dx.doi.org/10.1155/2018/2451915.

Full text

Abstract:

When inspecting the property of material, nondestructive testing methods are more preferable than destructive testing since they do not damage the test sample. Nondestructive testing methods, however, might not yield the same accurate results in examining the property of material when compared with destructive testing. To improve the result of nondestructive testing methods, this research applies artificial neural networks and adaptive neural fuzzy inference system in predicting the concrete strength estimation using nondestructive testing method, the ultrasonic pulse velocity test. In this research, data from a total of 312 cylinder concrete samples were collected. Ultrasonic pulse velocity test was applied to those 312 samples in the lab, following the ASTM procedure. Then, the testing results of 312 samples were used to develop and validate two artificial intelligence prediction models. The research results show that artificial intelligence prediction models are more accurate than statistical regression models in terms of the mean absolute percentage error.

APA, Harvard, Vancouver, ISO, and other styles

6

Qu, Zhi, Peng Jiang, and Weixu Zhang. "Development and Application of Infrared Thermography Non-Destructive Testing Techniques." Sensors 20, no. 14 (July 10, 2020): 3851. http://dx.doi.org/10.3390/s20143851.

Full text

Abstract:

Effective testing of defects in various materials is an important guarantee to ensure its safety performance. Compared with traditional non-destructive testing (NDT) methods, infrared thermography is a new NDT technique which has developed rapidly in recent years. Its core technologies include thermal excitation and infrared image processing. In this paper, several main infrared thermography nondestructive testing techniques are reviewed. Through the analysis and comparison of the detection principle, technical characteristics and data processing methods of these testing methods, the development of the infrared thermography nondestructive testing technique is presented. Moreover, the application and development trend are summarized.

APA, Harvard, Vancouver, ISO, and other styles

7

Peta, Katarzyna, Jan Żurek, and Adam Patalas. "Non-destructive testing of automotive heat exchangers." MATEC Web of Conferences 244 (2018): 03007. http://dx.doi.org/10.1051/matecconf/201824403007.

Full text

Abstract:

The paper presents the results of non-destructive testing to the final control of automotive heat exchangers, which must meet a number of technological and exploitative requirements resulting from their working conditions. For the observation of images of heat exchangers, verification of geometrical dimensions and identification of surface and volume defects, the used methods were: computed tomography (highresolution microtomograph Phoenix v|tome|x), three-dimensional optical scanning (3D GOM ATOS III optical scanner), coordinate measuring technique (coordinate measuring machine Hexagon Global Performance 122210). The effectiveness of nondestructive testing in industrial conditions was assessed and the directions of further research in this area were indicated.

APA, Harvard, Vancouver, ISO, and other styles

8

Petriceanu, Constantin Stefan, and Oana Virlan. "Mathematical Modeling of Non-Destructive Testing for Layered Materials." Applied Mechanics and Materials 760 (May 2015): 651–56. http://dx.doi.org/10.4028/www.scientific.net/amm.760.651.

Full text

Abstract:

This article deals with mathematical modeling of non-destructive testing of layered materials. Latest research in the nondestructive control modeling with ultrasound waves recommends, for a greater productivity, the use of layer waves Lamb type due to their properties to propagate in solid materials on long distances without any significant attenuation. In the first part it is shown and justified the usage of the choice of Lamb waves to control this type of material. Then follows the theoretical aspects of the modeling and the simulation of the propagation of Lamb waves in layered materials using the mathematical formalism of wave propagation characterization with a vector of type S called slowness vector. Afterwards the mathematical results are presented with the equation of motion within the considered hypothesis, the hypothesis determined in any point of the space of important acoustic parameters in nondestructive testing (in particular the amplitude of the reflected wave quasi-longitudinal wave) based on the known characteristics of the incipient vector (initial impulse). Then follows validation of the developed model based on some simulations using a specialized software. Finally conclusions are presented and prospects for the development of the method.

APA, Harvard, Vancouver, ISO, and other styles

9

Reese, C. Shane, Paul Deininger, Michael S. Hamada, and Robert Krabill. "Exploring the Statistical Advantages of Nondestructive Evaluation Over Destructive Testing." Journal of Quality Technology 40, no. 3 (July 2008): 259–67. http://dx.doi.org/10.1080/00224065.2008.11917732.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Laura, Patricio A. A. "Nondestructive Testing and Structural Condition Monitoring of Mechanical Cables." Applied Mechanics Reviews 46, no. 4 (April 1, 1993): 133–38. http://dx.doi.org/10.1115/1.3120320.

Full text

Abstract:

This article concerns the problem of evaluating the `structural health’ of cables or ropes by means of non-destructive testing methods. Special emphasis is placed upon electromagnetic techniques and the acoustic emission method.

APA, Harvard, Vancouver, ISO, and other styles

11

Vértesy, Gábor, Antal Gasparics, Inge Uytdenhouwen, Ildikó Szenthe, Ferenc Gillemot, and Rachid Chaouadi. "Nondestructive Investigation of Neutron Irradiation Generated Structural Changes of Reactor Steel Material by Magnetic Hysteresis Method." Metals 10, no. 5 (May 15, 2020): 642. http://dx.doi.org/10.3390/met10050642.

Full text

Abstract:

The neutron irradiation embrittlement of four different types of nuclear pressure vessel materials (three base metals and one weld material) were investigated by a magnetic nondestructive testing method, magnetic adaptive testing (MAT). The method is based on the measurement of minor magnetic hysteresis loops on Charpy specimens irradiated by neutrons in the BR2 reactor. Due to the neutron irradiation, the structure of the material was modified. The Charpy impact method is suitable for destructive characterization of material embrittlement. The results of Charpy impact test measurements at SCK CEN Belgian Nuclear Research Centre were compared with the nondestructively measured magnetic parameters. A definite correlation was found between magnetic descriptors and the ductile-to-brittle transition temperature (DBTT), regardless of the type of material or irradiation condition. The results suggest that this “calibration curve“ can be used to estimate the DBTT from non-destructive measurements.

APA, Harvard, Vancouver, ISO, and other styles

12

Piven, V. V., and G. Yu Gondurov. "THE BASIC TRENDS OF DEVELOPMENT OF VIBRODIAGNOSTIC NONDESTRUCTIVE TESTING OF TECHNICAL FACILITIES." Oil and Gas Studies, no. 5 (October 30, 2015): 100–103. http://dx.doi.org/10.31660/0445-0108-2015-5-100-103.

Full text

Abstract:

The main types of technical facilities non-destructive testing are presented. The classification of defects in rotating equipment by different indicators was made. The basic trends in development of vibrodiagnostic non-destructive testing of technical objects are described. The evolutionary model of vibration diagnostics at transition to service and repair based on the actual condition was developed.

APA, Harvard, Vancouver, ISO, and other styles

13

Lvova, Natalia, Ivan Evdokimov, and Sergey Perfilov. "Comparative Studies of Nanostructured Aluminum Alloys by Destructive and Nondestructive Testing." Advanced Materials Research 1119 (July 2015): 9–13. http://dx.doi.org/10.4028/www.scientific.net/amr.1119.9.

Full text

Abstract:

This work provides a comparative study of the mechanical properties of composite materials based on aluminum reinforced with carbon nanostructures. The study involved the tensile strength testing, as well as sclerometry and indentation in the submicron range. We determined the correlation of the values obtained for yield strength and hardness, and the tensile strength and morphology of the residual scratches.

APA, Harvard, Vancouver, ISO, and other styles

14

Dauji, Saha, Sandip Bhalerao, P. K. Srivastava, and Kapilesh Bhargava. "Conservative characteristic strength of concrete from nondestructive and partially destructive testing." Journal of Asian Concrete Federation 5, no. 1 (June 30, 2019): 25–39. http://dx.doi.org/10.18702/acf.2019.06.30.25.

Full text

APA, Harvard, Vancouver, ISO, and other styles

15

Petriceanu, Constantin Stefan, Corneliu Rontescu, and Gabriel Gârleanu. "The Ultrasonic Testing Methods for Special Braze Cladding." Applied Mechanics and Materials 834 (April 2016): 141–46. http://dx.doi.org/10.4028/www.scientific.net/amm.834.141.

Full text

Abstract:

The present paper highlights the ultrasonic methods that can be used to detect the problems that can occur in special braze cladding. For this purpose, the sample production technology is described and the nonconformities that can arise during welding have been reviewed. The main nondestructive testing techniques are briefly presented motivating the chosen method for this study. Further, in the paper, the experimental procedure, materials and equipment used for welding are detailed. In the end, a comparison has been made between various parameters resulted from the nondestructive ultrasonic investigation. A validation for the presented method has been made through destructive examination by electron microscopy.

APA, Harvard, Vancouver, ISO, and other styles

16

Kumar, S. Suresh, and Balasubramanian Ravisankar. "Evaluation of Quality Diffusion Bonding in Similar Material (Cu/Cu) Using Ultrasonic ‘C’ Scan Testing Method." Applied Mechanics and Materials 592-594 (July 2014): 289–93. http://dx.doi.org/10.4028/www.scientific.net/amm.592-594.289.

Full text

Abstract:

In the present study, diffusion bonding of Cu/Cu was carried out at 750 °C for 60min under uniaxial pressureof 5-15MPa in vacuum. The joints were evaluated by Microtensile testing and Ultrasonic testing. The bond qualities were assessed by destructive testing (strength ratio) and nondestructive ultrasonic C–scan testing method.The bond quality obtained by both the methods is correlated in a view to use the C scan for regular testing. The optimum condition for obtaining the best bonding characteristics is reported. The joint obtained by diffusion bonding at 750 °C and a applied pressure of 15MPa for 60min gives the best bonding characteristics.Keywords: diffusion bonding/welding, Interface, Ultrasonic nondestructive testing.

APA, Harvard, Vancouver, ISO, and other styles

17

Jasieńko, Jerzy, Tomasz Nowak, and Katarzyna Hamrol. "Selected Methods of Diagnosis of Historic Timber Structures – Principles and Possibilities of Assessment." Advanced Materials Research 778 (September 2013): 225–32. http://dx.doi.org/10.4028/www.scientific.net/amr.778.225.

Full text

Abstract:

The paper presents a survey of state-of-the-art nondestructive and semi-destructive diagnostic techniques of testing timber structures and examples of their application. Nondestructive testing is a field of study which covers: identifying the mechanical and physical properties of materials and structural components, detecting material defects and discontinuities, and measuring the geometric dimensions of objects without affecting their performance. The nondestructive and semi-destructive methods are described in a systematic manner and the relevant equipment, technology and applications are discussed. The paper focuses on acoustic methods, resistance drilling techniques and radiography, which are suitable for detecting internal defects, decay and cracks, determining the location and dimensions of degraded areas and assessing the mechanical properties of structural timber members. Much attention is devoted to the techniques that are used in practice and have shown significant promise for future development. The results of several drilling resistance tests carried out on historic timber structures are presented.

APA, Harvard, Vancouver, ISO, and other styles

18

Yildiz, Fikret, Ahmet Turan Özdemir, and Selman Uluışık. "Evaluation Performance of Ultrasonic Testing on Fruit Quality Determination." Journal of Food Quality 2019 (July 8, 2019): 1–7. http://dx.doi.org/10.1155/2019/6810865.

Full text

Abstract:

There are several destructive and nondestructive methods for quality evaluation of agricultural products. Most of the employed traditional techniques are time-consuming and involve considerable degree of manual works. Destructive methods provide reasonable success rate of quality determination of fruits; however, they practically have many concerns about effectiveness, time, and cost. Therefore, developing portable, fast, and cost-effective techniques without harming fruits are desired for fruit quality evaluation. This work aims to develop a complete nondestructive quality evaluation system with (a) ultrasonic testing and (b) volume estimation by automatic machine vision techniques. The ultrasonic system consisted of a programmable bipolar remote pulser unit, a couple of piezoelectric probes for ultrasonic signal acquisitions as a transmitter and a receiver, an oscilloscope, and a computer. Visual appearance (size/volume) was determined using a machine vision system based on image processing techniques. Five different images of a fruit from different angles were captured by high-resolution digital cameras. Volume of the fruit was computed after horizontal and vertical distance of the fruit’s images captured. The calculated volume values by the computer vision system are validated with the theoretical values. Although nondestructive ultrasonic estimation and volume estimation by image processing methods are cheap, fast, and practical, the results obtained in our experiments concluded that these methods are not as reliable as claimed in the literature.

APA, Harvard, Vancouver, ISO, and other styles

19

Carbol, Ladislav, Jan Martinek, and Daniela Štefková. "Correct Choice of Maximum Length Sequence in Nondestructive Testing." Advanced Materials Research 1124 (September 2015): 280–87. http://dx.doi.org/10.4028/www.scientific.net/amr.1124.280.

Full text

Abstract:

Maximum Length Sequence has great potential as testing signal in non-destructive testing. Because its autocorrelation is almost a delta function, the sequence can be used for speed of sound assessment. Resulting Impulse response contains very similar data as Impact-echo. Unlike Impact-echo, where strike energy is limited by nonlinear effects, Maximum Length Sequence can deliver virtually unlimited energy over time. Length of the sequence and also signal generation rate is a curtail choice in order to achieve the best results.

APA, Harvard, Vancouver, ISO, and other styles

20

Kumpati, Ramesh, Wojciech Skarka, and Sunith Kumar Ontipuli. "Current Trends in Integration of Nondestructive Testing Methods for Engineered Materials Testing." Sensors 21, no. 18 (September 15, 2021): 6175. http://dx.doi.org/10.3390/s21186175.

Full text

Abstract:

Material failure may occur in a variety of situations dependent on stress conditions, temperature, and internal or external load conditions. Many of the latest engineered materials combine several material types i.e., metals, carbon, glass, resins, adhesives, heterogeneous and nanomaterials (organic/inorganic) to produce multilayered, multifaceted structures that may fail in ductile, brittle, or both cases. Mechanical testing is a standard and basic component of any design and fabricating process. Mechanical testing also plays a vital role in maintaining cost-effectiveness in innovative advancement and predominance. Destructive tests include tensile testing, chemical analysis, hardness testing, fatigue testing, creep testing, shear testing, impact testing, stress rapture testing, fastener testing, residual stress measurement, and XRD. These tests can damage the molecular arrangement and even the microstructure of engineered materials. Nondestructive testing methods evaluate component/material/object quality without damaging the sample integrity. This review outlines advanced nondestructive techniques and explains predominantly used nondestructive techniques with respect to their applications, limitations, and advantages. The literature was further analyzed regarding experimental developments, data acquisition systems, and technologically upgraded accessory components. Additionally, the various combinations of methods applied for several types of material defects are reported. The ultimate goal of this review paper is to explain advanced nondestructive testing (NDT) techniques/tests, which are comprised of notable research work reporting evolved affordable systems with fast, precise, and repeatable systems with high accuracy for both experimental and data acquisition techniques. Furthermore, these advanced NDT approaches were assessed for their potential implementation at the industrial level for faster, more accurate, and secure operations.

APA, Harvard, Vancouver, ISO, and other styles

21

Qiao, Lan, Ming Cui, and Qing Chi Cai. "Nondestructive Testing for Support Quality of Tunnel." Applied Mechanics and Materials 501-504 (January 2014): 1815–19. http://dx.doi.org/10.4028/www.scientific.net/amm.501-504.1815.

Full text

Abstract:

A tunnel in Chengde collapsed several times and cracks existed in the second lining. Using non-destructive testing equipment, tunnel support was detected to find out the hidden trouble early. In the section of K16+890~K16+950, the quality of tunnel support was assessed, with GPR and anchor measuring apparatus. In the tunnel, the thickness of composite lining was 25cm, and the second lining was 38cm, both of which met the design requirements. Positive peak method was selected to locate on I beam. The average longitude space of I beam was 127cm, while the design value is 120cm. Many rock bolts was lacked at the right crown. Moreover, the bolts in the haunch did not kept in diamond layout, close to I beam. Through analyzing waveforms of impact-echo, the number of qualified bolts only made up 74 per cent of the total bolts. The large space of I beam led to the lack of holding power. Meanwhile, the disqualified bolts limit the coordination deformation between surrounding rock and support. All the support defects led to tunnel collapse. These tests results demonstrate that NDTcan be used to mitigate the risks of tunnel construction.

APA, Harvard, Vancouver, ISO, and other styles

22

Kroening, Michael, Dmitry Sednev, and Yana Salchak. "Heavy-Loaded Components Quality Assurance by Means of Non-Destructive Testing." Advanced Materials Research 1040 (September 2014): 937–42. http://dx.doi.org/10.4028/www.scientific.net/amr.1040.937.

Full text

Abstract:

In present paper principles of acoustic scattering in case hardened components were discussed. Improvements of ultrasonic testing method and instrument development opportunities were proposed. Through these investigations, it would be possible to provide an advanced method of ultrasonic testing of case hardening quality, which might be applied in Russian metallurgical industry market. Comparative analysis of characteristics of existing instrument and the proposed instrument was conducted. This article demonstrates all important advantages of the proposed method of nondestructive testing for quality control of heavy-loaded components.

APA, Harvard, Vancouver, ISO, and other styles

23

Rens, Kevin L., and Taewan Kim. "Inspection of Quebec Street Bridge in Denver, Colorado: Destructive and Nondestructive Testing." Journal of Performance of Constructed Facilities 21, no. 3 (June 2007): 215–24. http://dx.doi.org/10.1061/(asce)0887-3828(2007)21:3(215).

Full text

APA, Harvard, Vancouver, ISO, and other styles

24

Ornatsky, D. P., O. O. Krivokulska, O. O. Burbela, and O. D. Bliznyuk. "Measuring System for Non-Destructive Testing of Metal Rods." Metrology and instruments, no. 2 (May 21, 2020): 22–24. http://dx.doi.org/10.33955/2307-2180(2)2020.22-24.

Full text

Abstract:

The control parameters of metal products using the eddy current method of nondestructive testing based on electromagnetic induction law is now widespread. Due to the high sensitivity over a wide frequency range of the ability to control the mechanical properties , uniformity of material, both magnetic and non-magnetic materials, beskonechnosti, high reliability, automation, process control, etc. The object of study is the process of interaction of external electromagnetic fields with defects in heterogeneity of structure in metal rod, causing a deformation of microtubuli currents and, accordingly, their influence on the inductance coil of the sensor. So, according to the law of electromagnetic induction eddy currents induced by an external electromagnetic field will be asking a private field that will oppose the external field that will lead to a change in inductance of the sensor coil. Therefore, the most informative parameter in this case is the relative change in inductance of the sensor. In the known designs use differential transformer sensors, transmission type, which differ in complexity of implementation, but have high sensitivity. In existing works not enough attention on improving of the metrological characteristics . Modern means of microstraava flaw detectors in the overwhelming number are for scientific research, but little attention is paid to tools that can be used in industrial processes, through a complex measurement process in the existing funds and the large volume of the software during automatic processing of information. In the presented work there is a system for nondestructive testing of metal bars with deprivation of the above-mentioned disadvantages, which would provide high metrological characteristics in a wide frequency range, separate measurement of impedance components of the sensor, which allows the reduction of methodological errors of determination of the main characteristics of the output signal of microstraava sensors. The scientific result is created sambalanco pavement system based on electronic dharamtala model of a vortex sensor with high metrological characteristics, which allows you to create real-time signal proportional to the amount of damage that will give you the opportunity to increase productivity in the quality control bar of metal products in a production environment.

APA, Harvard, Vancouver, ISO, and other styles

25

Plachy, Tomáš, Tomáš Svoboda, Jaroslav Topič, Zdeněk Prošek, Václav Nežerka, and Pavel Tesárek. "Non-Destructive Testing of Composite Gypsum Material Properties – Long Time Measurement." Applied Mechanics and Materials 732 (February 2015): 321–24. http://dx.doi.org/10.4028/www.scientific.net/amm.732.321.

Full text

Abstract:

The paper presents results of long-time investigation of mechanical properties of composite gypsum material using nondestructive technique. The gypsum block was put to the façade of the building for four years. Then it was removed and cut to smaller specimens, which were investigated. The matrix of 6 × 4 specimens of dimensions 40 × 40 × 160 mm were cut from the block after its removal from the façade. After 6 and 9 years, the Young’s moduli and shear moduli of these specimens were determined from the transversal, longitudinal and torsional vibrations using the impulse excitation method.

APA, Harvard, Vancouver, ISO, and other styles

26

Liu, Lin Dong, and Xiao Qing Wu. "Defect Types and Ultrasonic Nondestructive Testing for Fiber-Reinforced Composites." Advanced Materials Research 834-836 (October 2013): 233–36. http://dx.doi.org/10.4028/www.scientific.net/amr.834-836.233.

Full text

Abstract:

In this paper, an attempt is made to introduce the defect types relevant to ultrasonic non-destructive testing, and then, we explain how these defects generate in fiber-reinforced composites. The common failure modes which occur are described and discussed. The significance of each of the fracture mechanisms, in terms of their effects on the residual load-bearing properties, is considered. The second part describes briefly the main relevant ultrasonic NDT methods used to identify these defects and indicates the sensitivity to the different types of defect.

APA, Harvard, Vancouver, ISO, and other styles

27

Plachý, Tomáš, Pavel Tesárek, Lukáš Hlubocký, Jaromír Hrůza, Jozef Fládr, Jan Trejbal, and Zdeněk Prošek. "Effect of Microfillers on Selected Destructive and Nondestructive Mechanical Properties of Cement Mortars: Different Types of Recycled Materials." Key Engineering Materials 722 (December 2016): 195–200. http://dx.doi.org/10.4028/www.scientific.net/kem.722.195.

Full text

Abstract:

The paper presents the use of non-destructive testing to determine the evolution of mechanical properties. For testing, we used the resonance method. The measuring device of company Brüel&Kjær was used. Specifically, evolution of dynamic modulus of elasticity (determined from the longitudinal and transverse vibration) and the shear modulus was determined for the first 28 days after production of the samples. The results of non-destructive method were also used for verifying the relevance of the results of destructive testing, specifically the results of the compressive strength and a three-point flexural strength. Testing of mechanical properties was performed on samples of cement mortars, where the micronized recycled concrete and micronized marble powder were used as microfillers, both materials were prepared on a high-speed mill of the Lavaris company (Czech Republic).

APA, Harvard, Vancouver, ISO, and other styles

28

Scanlon, Andrew, and Leonid Mikhailovsky. "Strength evaluation of an existing concrete bridge based on core and non-destructive test data." Canadian Journal of Civil Engineering 14, no. 2 (April 1, 1987): 145–54. http://dx.doi.org/10.1139/l87-026.

Full text

Abstract:

The use of concrete cores and nondestructive testing for strength evaluation of existing structures is illustrated through an evaluation of an existing concrete bridge. The results confirm that rebound hammer number should not be used alone as an indicator of in situ compressive strength. Reasonably good correlation is demonstrated between pulse velocity and compressive strength, with a slight improvement when pulse velocity and rebound number are combined.A probabilistic approach to structural evaluation of existing structures is proposed in which the variability of in situ concrete compression strength and uncertainty associated with indirect nondestructive testing are incorporated. An example of shear strength evaluation is given, which indicates a range of increase in shear strength compared with initial design parameters of 17–37% depending on the amount and type of data available.

APA, Harvard, Vancouver, ISO, and other styles

29

Tang, Qing Ju, Jun Yan Liu, and Yang Wang. "Theoretical and Experimental Study on Nondestructive Pulse Phase Infrared Thermography Testing Technology." Advanced Materials Research 314-316 (August 2011): 1483–86. http://dx.doi.org/10.4028/www.scientific.net/amr.314-316.1483.

Full text

Abstract:

The non-destructive pulsed phase thermography technique was used to detect metal specimen with flat blind-bottom holes and composite specimen with sticky areas. An experimental platform was built base on the analysis of the pulsed phase thermography testing principle. Experimental results show the different testing effect of the original thermography, amplitude and phase images.

APA, Harvard, Vancouver, ISO, and other styles

30

Fan, Jin Wei, Yi Jia Liu, Ling Chen, Shi Ji, and Shuai Yuan. "A Kind of Multi-Functional Wall Surface Nondestructive Testing Device." Applied Mechanics and Materials 716-717 (December 2014): 958–60. http://dx.doi.org/10.4028/www.scientific.net/amm.716-717.958.

Full text

Abstract:

In this paper, non-destructive testing on the inner wall surface of the deep, invented a detection device, the device by numerical control systems, mechanical control devices and imaging device components. PC lower machine controlled by CNC system mechanical devices IPC and PLC can control the composition includes a manual lift the car up and down movement, control multistage axial movement of the cylinder and the axial rotation of the servo motor control to meet the imaging device the location requirements. Imaging device consists of a high-speed industrial cameras and miniature camera components. The device has a low cost, high accuracy, simple manufacturing process and so on.

APA, Harvard, Vancouver, ISO, and other styles

31

Vértesy, Gábor, Tetsuya Uchimoto, Toshiyuki Takagi, and Ivan Tomáš. "Nondestructive Inspection of Ductile Cast Iron by Measurement of Minor Magnetic Hysteresis Loops." Materials Science Forum 659 (September 2010): 355–60. http://dx.doi.org/10.4028/www.scientific.net/msf.659.355.

Full text

Abstract:

Systematic measurement of minor magnetic hysteresis loops of traditional hysteresis tests requires substantially lower magnetization of samples and offers higher sensitivity of detection of changes in the ferromagnetic materials’ microstructure. The keynote idea of this method, called Magnetic Adaptive Testing (MAT) is utilization of sensitive correlations between the varied microstructure of the magnetized material and the corresponding, highly sensitive modifications of some of the minor hysteresis loops. The paper presents some of the recent results of the MAT measurement performed on specially prepared series of cast iron samples. Results of the non-destructive magnetic tests were compared with the destructive mechanical measurements of Brinell hardness and linear correlation was found between them. A very good correlation was also found between magnetic descriptors and conductivity and chill/ferrite area fraction. Based on these results, Magnetic Adaptive Testing is suggested as a highly promising non-destructive method for monitoring structural changes in different types of ferromagnetic materials.

APA, Harvard, Vancouver, ISO, and other styles

32

Schabowicz, Krzysztof. "Testing of Materials and Elements in Civil Engineering." Materials 14, no. 12 (June 20, 2021): 3412. http://dx.doi.org/10.3390/ma14123412.

Full text

Abstract:

This issue is proposed and organized as a means to present recent developments in the field of testing of materials in civil engineering. For this reason, the articles highlighted in this issue should relate to different aspects of testing of different materials in civil engineering, from building materials and elements to building structures. The current trend in the development of materials testing in civil engineering is mainly concerned with the detection of flaws and defects in elements and structures using destructive, semi-destructive, and nondestructive testing. The trend, as in medicine, is toward designing test equipment that allows one to obtain a picture of the inside of the tested element and materials. Very interesting results with significance for building practices of testing of materials and elements in civil engineering were obtained.

APA, Harvard, Vancouver, ISO, and other styles

33

Abdel Rahim, Khalid Abdel Naser. "Evaluating Concrete Quality using Nondestructive In-situ Testing Methods." Revista Tecnología y Ciencia, no. 36 (October 10, 2019): 22–40. http://dx.doi.org/10.33414/rtyc.36.22-40.2019.

Full text

Abstract:

This manuscript investigate the quality of concrete using non-destructive in-situ testing.The in-situ testing is a process by which different test are carried out such as rebound hammer, ultrasonic pulse veloc-ity, initial surface absorption test and fig air, to determine thein-situ strength, durability and deterioration, air permeability, concrete quality control andperformance. Additionally, the quality of concrete was researched using test methods with experimental results. Moreover, this research has found that (1) the increase in w/c ra-tioleads to a decrease in compressive strength and ultrasonic pulse velocity. Thus, lower w/cratio gives a bet-ter concrete strength in terms of quality, (2) the quicker the ultrasonic pulse travels through concrete indicates that the concrete is denser, therefore, better quality, (3) the lower initial surface absorption value indicates a better concrete with respect to porosity and (4) the w/c ratio plays an important role in the strength and per-meability of concrete.

APA, Harvard, Vancouver, ISO, and other styles

34

Sarvesh. S. P, Sarvesh S. P. "An Optimization of TIG Welding (SS304) Parameters using Destructive and Nondestructive Testing Method." International Journal of Mechanical and Production Engineering Research and Development 9, no. 3 (2019): 1399–406. http://dx.doi.org/10.24247/ijmperdjun2019146.

Full text

APA, Harvard, Vancouver, ISO, and other styles

35

Hooton, RD, DG Goulias, and A.-H. Ali. "Evaluation of Rubber-Filled Concrete and Correlation Between Destructive and Nondestructive Testing Results." Cement, Concrete and Aggregates 20, no. 1 (1998): 140. http://dx.doi.org/10.1520/cca10447j.

Full text

APA, Harvard, Vancouver, ISO, and other styles

36

Luo, Xiao Yu, Yu Zhang, Zi Jian Wang, and Yi Sheng Zhang. "Non-Destructive Testing Device for Hot Forming High Strength Steel Parts Based on Barkhausen Noise." Applied Mechanics and Materials 423-426 (September 2013): 2555–58. http://dx.doi.org/10.4028/www.scientific.net/amm.423-426.2555.

Full text

Abstract:

In order to realize the nondestructive testing for hot forming high strength steel parts, a hardness testing device based on Magnetic Barkhausen Noise (MBN) was developed. By measuring MBN of standardized blocks of Rockwell hardness and extracting feature values of the noise, a fitted curve between hardness and MBN peak was calibrated. Good linearity was found between hardness and MBN peak within high hardness range 35~60HRC. The testing device was proved to be high-precision and stable by measuring the practical high strength steel parts.

APA, Harvard, Vancouver, ISO, and other styles

37

Yang, Jing, Wei Heng Yuan, and Jun Tan. "Research on Non-Destructive Testing for Defects of Steel Bar in Concrete." Applied Mechanics and Materials 351-352 (August 2013): 143–47. http://dx.doi.org/10.4028/www.scientific.net/amm.351-352.143.

Full text

Abstract:

Steel bar defect detection in concrete is an important content of civil engineering structure detection. Currently there are no effective methods for nondestructive testing of steel bar defects . This paper studies the application of electromagnetic induction technology for Steel bar defect detection. Firstly, the principle of electromagnetic induction technology to detect rebar are described. Secondly,an air dielectric test device was designed and Steel bar defect in the device was detected by magnetic scanner. Through analyzing we got the characteristics of scanning images from different Steel bar defects. Thirdly this experimental result was compared with detection result in concrete.Finally verify the accuracy and feasibility of this method.

APA, Harvard, Vancouver, ISO, and other styles

38

Chang, Tien Sheng, Wen Hsiang Hsieh, Y. A. Hsieh, and C. H. Yang. "Nondestructive Disassembly System for White Board Marker." Materials Science Forum 505-507 (January 2006): 955–60. http://dx.doi.org/10.4028/www.scientific.net/msf.505-507.955.

Full text

Abstract:

The rapidly growing concern about environmental and resource protection have stimulatedmany industrial sectors to solve the disposal problems of used products. The recovery processes canbe simply categorized into material recovery and product/component recovery. Material recoverymostly involves disassembly for separation and processing of materials of used products. Destructive methods such as dismantling, shredding, or chemical operations are normally used. Product recoveryincludes disassembly, cleaning, sorting, replacing or repairing bad components, reconditioning,testing, reassembling and inspecting. These recovered components/products can be reused inrepairing and re-manufacturing. That provides an opportunity in bringing the used products back to an “as new” condition. This paper utilizes the concept of non-destructive method of product recovery processes and develops an automatic disassembly system for white board marker pens. The experimental results show that the cycle time for the disassembly processes is about 3.8 second that is believed to be compatible to the desired feeding rate for manufacturing. In addition, the reused rate for the recovered components is close to 100% except the fiber-refill component.

APA, Harvard, Vancouver, ISO, and other styles

39

Киреенко, Vadim Kireenko, Власов, and Aleksey Vlasov. "Nondestructive Testing at “Northern Machine-Building Enterprise” (“Sevmash”)." NDT World 18, no. 3 (September 1, 2015): 17–20. http://dx.doi.org/10.12737/12566.

Full text

Abstract:

“Sevmash” is one of the biggest Russian shipbuilding enterprises. Its capacity enables high-tech and knowledge-intensive projects to be fulfilled, such as manufacturing of spent nuclear fuel containers, building of modern nuclear-powered submarines (NPS) and marine engineering structures. The enterprise has mastered manufacturing of offshore platforms for oil and gas field development in the Arctic. Now “Sevmash” continues construction of nuclear strategic and multi-purpose submarines of the fourth generation “Borey” and “Yasen”. The article deals with the formation and development of non-destructive testing services from its beginning to the present day. Since 1950s, the radiography of hull structures welded seams and pipelines joints was the main testing method. In 1970s construction of new generation nuclear submarines began; it was necessary to create gamma flaw detectors of new design and they were created within 15 years. Besides in 1970s the active period began for development of ultrasonic testing instruments. In 1970s–1990s, concurrently with radiographic and ultrasonic techniques, testing of welds during the welding process with an acoustic emission method was carried out. In 1990s magnetic particle inspection of welded joints, radiation monitoring, leakage testing with the use of helium leak detectors and vacuum chambers had been extensively developed. The bubble vacuum method of welded connections testing was widely used in the process of repair and re-equipment of surface crafts. Today “Sevmash” actively re-equips its production facilities. It gives “Sevmash” the opportunity to built ships that meet the highest demands.

APA, Harvard, Vancouver, ISO, and other styles

40

Peterka, Pavel, Jozef Krešák, Stanislav Kropuch, Andrea Bérešová, and Dušan Mitrík. "Non-Destructive Testing of Steel Wire Rope Transmission Area to Rope End by Magnetic Flux Leakage." Applied Mechanics and Materials 683 (October 2014): 39–44. http://dx.doi.org/10.4028/www.scientific.net/amm.683.39.

Full text

Abstract:

At present the need of nondestructive testing of rope bridges state appears often. Modern maintenance trends using non-destructive checking allow to detect the state of these materials in service without breaking their integrity. From the point of view of so far used non-destructive testing methods the area of cable end is not accessible. The magnetic properties research of these materials and the subsequent design of new structures for scanning elements will enable non-destructive monitoring of the state of the ropes steel material of static constructions, especially their anchoring. The article aims to present the results from tracking of the magnetic flux around the cable end and signal runs from particular designed and investigated scanning elements placed above artificial defects created closely to the cable end.

APA, Harvard, Vancouver, ISO, and other styles

41

Mohammad, Iqbal Khan. "Non-Destructive Testing for Concrete: Dynamic Modulus and Ultrasonic Velocity Measurements." Advanced Materials Research 243-249 (May 2011): 165–69. http://dx.doi.org/10.4028/www.scientific.net/amr.243-249.165.

Full text

Abstract:

Nondestructive testing (NDT) is a technique to determine the integrity of a material, component or structure. The commonly NDT methods used for the concrete are dynamic modulus of elasticity and ultrasonic pulse velocity. The dynamic modulus of elasticity of concrete is related to the structural stiffness and deformation process of concrete structures, and is highly sensitive to the cracking. The velocity of ultrasonic pulses travelling in a solid material depends on the density and elastic properties of that material. Non-destructive testing namely, dynamic modulus of elasticity and ultrasonic pulse velocity was measured for high strength concrete incorporating cementitious composites. Results of dynamic modulus of elasticity and ultrasonic pulse velocity are reported and their relationships with compressive strength are presented. It has been found that NDT is reasonably good and reliable tool to measure the property of concrete which also gives the fair indication of the compressive strength development.

APA, Harvard, Vancouver, ISO, and other styles

42

Asif, Muhammad, Muhammad A. Khan, Sohaib Z. Khan, Rizwan S. Choudhry, and Kamran A. Khan. "Identification of an effective nondestructive technique for bond defect determination in laminate composites—A technical review." Journal of Composite Materials 52, no. 26 (March 29, 2018): 3589–99. http://dx.doi.org/10.1177/0021998318766595.

Full text

Abstract:

Laminate composites are commonly used for the production of critical mechanical structures and components such as wind turbine blades, helicopter rotors, unmanned aerial vehicle wings and honeycomb structures for aircraft wings. During the manufacturing process of these composite structures, zones or areas with weak bond strength are always issues, which may affect the strength and performance of components. The identification and quantification of these zones are always challenging and necessary for the mass production. Non-destructive testing methods available, including ultrasonic A, B, and C-Scan, laser shearography, X-ray tomography, and thermography can be useful for the mentioned purposes. A comparison of these techniques concerning their capacity of identification and quantification of bond defects; however, still needs a comprehensive review. In this paper, a detailed comparison of several non-destructive testing techniques is provided. Emphasis is placed to institute a guideline to select the most suitable technique for the identification of zones with bond defects in laminated composites. Experimental tests on different composite based machined components are also discussed in detail. The discussion provides practical evidence about the effectiveness of different non-destructive testing techniques.

APA, Harvard, Vancouver, ISO, and other styles

43

Huang, Hui, Ding Yue Chen, Guo Jun Mao, and Hui Chen. "Complete Equipment Inspection Method Based on Risk Assessment and Nondestructive Testing." Applied Mechanics and Materials 330 (June 2013): 242–49. http://dx.doi.org/10.4028/www.scientific.net/amm.330.242.

Full text

Abstract:

Three propylene spherical tanks which have both the same manufacturing parameters and conditions have been assessed based on risk assessment and non-destructive testing technology. One of the spherical tanks is stopped for comprehensive inspection, and the result of inspection verifies the reliability of risk assessment, which is applied to other two unopened propylene spherical tanks. Meanwhile, in order to make overall inspection level meet the requirements of the risk assessment and so reduce spherical tanks assessing risk, ultrasonic diffraction detection (TOFD) with high detection rate and fluorescent magnetic surface detection technology are adopted to ensure comprehensive test meeting the risk assessment requirements, which can also provide significant guidance for future complete equipment inspection.

APA, Harvard, Vancouver, ISO, and other styles

44

Hamzah, Norhayati, Deepak Kumar Ghodgaonkar, Kamal Faizin Che Kasim, and Zaiki Awang. "Microwave Non-Destructive Testing of Coatings and Paints Using Free Space Microwave Measurement." Scientific Research Journal 2, no. 2 (December 31, 2005): 17. http://dx.doi.org/10.24191/srj.v2i2.9329.

Full text

Abstract:

Microwave nondestructive testing (MNDT) techniques are applied to evaluate quality of anti-corrosive protective coatings and paints on metal surfaces. A tree-space microwave measurement (FSMM) system is used for MNDT of protective coatings. The FSMM system consists of transmit and receive spot-focusing horn lens antennas, a vector network analyzer, mode transitions and a computer. Diffraction effects at the edges of the sample are minimized by using spot-focusing horn lens antennas. Errors due to multiple reflections between antennas are corrected by using free-space LRL (line, reflect, line) calibration technique. We have measured complex reflection coefficient of polyurethane based paint which is coated on brass plates.

APA, Harvard, Vancouver, ISO, and other styles

45

Khalim, A. R., D. Sagar, M. D. Kumruzzaman, and A. S. M. Z. Hasan. "Combination of nondestructive evaluations for reliable assessment of bridge deck." Facta universitatis - series: Architecture and Civil Engineering 9, no. 1 (2011): 11–22. http://dx.doi.org/10.2298/fuace1101011k.

Full text

Abstract:

Non-destructive evaluation (NDE) has offered unprecedented utilize for bridge management body to monitor structural health. None of these evaluation methods can provide all the damage information (damage category, quantitative assessment) alone which is required for necessary repair activity and condition rating of structure. In most of the cases, the response of one evaluation method implies the presence of a defect among the multiple defects to which the evaluation method is sensitive. This paper is concerned with the combination of different non-destructive testing to find out the type of damage with the most efficient way. The different response (positive or negative) obtained from each combination and how it confirms the defect is shown through the mathematical set operation. Thus, this study would assist field investigator to ascertain the type of defect which subsequently aids to rate structure based on damage type.

APA, Harvard, Vancouver, ISO, and other styles

46

Skafidas, Panagiotis. "Non-Destructive Testing of Mechanical Properties of Magnetic Materials Using Barkhausen Noise and B-H Loop Techniques." Key Engineering Materials 495 (November 2011): 272–75. http://dx.doi.org/10.4028/www.scientific.net/kem.495.272.

Full text

Abstract:

A magnetic-based nondestructive evaluation (NDE) method, which employs Barkhausen effect and measurement of hysteresis loops, is developed and used to correlate the magnetic and mechanical properties. The NDE test equipment offers the capability to detect small deviations from linearity that occur in the stress-strain curve.

APA, Harvard, Vancouver, ISO, and other styles

47

Brigante, Michele, and Mariano Modano. "Theoretical Models and Experimental Techniques in Nondestructive Evaluation of Concrete." Key Engineering Materials 293-294 (September 2005): 207–16. http://dx.doi.org/10.4028/www.scientific.net/kem.293-294.207.

Full text

Abstract:

When evaluating concrete strength, common opinion is that adequate precisions can be achieved only by a particular or even total destruction. However, such methods are not always applied, besides they are very laborious. The NDE methods have a number of merits, when compared with destructive ones: a possibility to find cracks and hidden flaws in concrete; besides, they show good results in testing materials of other types, such as metals and composites. At the same time, application of NDE methods to concretes is difficult because of their complex internal structure. No existing theory can predict these properties of the transmitted wave. Therefore, the main goal of the present work is to propose a theoretical model enabling the wave penetration of ultrasonic wave through a medium with multiple internal obstacles to be described adequately. Practical applications of this ultrasonic method is toward the evaluation of mechanical properties of concrete, where the influence of internal dislocations, such as pores and cracks, is of significant importance.

APA, Harvard, Vancouver, ISO, and other styles

48

Song, Kyung Seok, Myung Seok Ko, and Jae Yeol Kim. "A Study on Corrosion Defect Evaluation of Painted Metal by Using Nondestructive Tests." Advanced Materials Research 47-50 (June 2008): 1071–75. http://dx.doi.org/10.4028/www.scientific.net/amr.47-50.1071.

Full text

Abstract:

Importance on the detection of corrosion-related defect is undeniable from the fact that it can prevent significant economic loss and enhanced safety in mechanical equipments, pipes, ships, bridges, and other applications. Conventionally researched measurement methods for defect and thinning from corrosion are acoustic emission, EMAT using ultrasound, laser induced ultrasound, etc. However, these non-destructive testing methods have the shortcoming of accessibility to on-site. For instance, EMAT should be close to several millimeters to generate magnetic field in structure. For laser application, it can be applied to remote non-destructive testing, but some defect might not be possible to be detected by the surface condition of structure. In this study, infrared thermography camera is utilized to determine the degree of corrosion on paint-coated metal. In addition, fundamental researches to develop corrosion detection system for on-site metallic structure are conducted to provide the applicability of IR camera and possibility of thermal analysis method.

APA, Harvard, Vancouver, ISO, and other styles

49

Toda, Marta, and Katarzyna Ewa Grabowska. "Computed microtomography in the analysis of fiber migration in yarn." Autex Research Journal 13, no. 1 (March 27, 2013): 28–32. http://dx.doi.org/10.2478/v10304-012-0020-x.

Full text

Abstract:

Abstract This study is a short analysis of the use of computer microphotography in fiber migration testing as a modern nondestructive testing method. Microtomography operates similarly to X-ray computed tomography systems used in medicine, but with much better resolution owing to the use of a smaller radiation spot. The internal structure is reconstructed as a series of two-dimensional cross-sections that are then used to create 2D and 3D morphological objects. This process is non-destructive and does not require special preparation of a testing material.

APA, Harvard, Vancouver, ISO, and other styles

50

Matysík, Michal, Ladislav Carbol, Zdenek Chobola, Richard Dvořák, and Iveta Plšková. "Comparison of Ultrasonic Methods for Thermally Damaged Concrete Nondestructive Testing." Key Engineering Materials 776 (August 2018): 86–91. http://dx.doi.org/10.4028/www.scientific.net/kem.776.86.

Full text

Abstract:

Behaviour of concrete under elevated temperatures is very complex. There is a change of mechanical and physical parameters with temperature. In this paper we study the relations of thermal damage processes in concrete and parameters obtained by different ultrasonic methods. The concrete specimens were heated in programmable laboratory furnace. Selected temperature (200°C, 400°C, 600°C, 800°C, 1000°C and 1200°C) were maintained for 60 minutes. The first ultrasonic measurement technique in this paper was Ultrasonic Pulse Velocity method. The pulse velocity in a concrete depends on its density and its elastic properties. Therefore, it is possible to deduce the quality and the compressive strength of the concrete from the ultrasonic pulse velocity. The second ultrasonic measurement technique in this paper uses broadband pulse-compression signal, with variable amplitude to measure the change of fundamental frequency. This method is based on Nonlinear Elastic Wave Spectroscopy. Nonlinear Elastic Wave Spectroscopy methods takes advantage of the fact, that nonlinearities in material manifest themselves as a resonant frequency shifts and harmonics or dumping coefficients changes. The progress of nondestructive testing parameters was confirmed by results from the destructive tests.

APA, Harvard, Vancouver, ISO, and other styles

Journal articles on the topic 'Nondestructive and destructive testing'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles