scholarly journals The Examination of Restrained Joints Created in the Process of Multi-material FFF Additive Manufacturing Technology

2020 ◽  
Author(s):  
Janusz Kluczynski ◽  
Lucjan Sniezek ◽  
Alexander Kravcov ◽  
Krzysztof Grzelak ◽  
Pavel Svoboda ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Acrylonitrile Butadiene Styrene ◽  
Tensile Tests ◽  
Lower Amount ◽  
Internal Quality ◽  
Experimental Production ◽  
Destructive Testing ◽  
Non Destructive

The paper is focused on the examination of the internal quality of joints created in a multi-material - additive manufacturing process. The main part of the work focuses on experimental production and non-destructive testing of restrained joints of modified PLA (polylactic acid) and ABS (Acrylonitrile butadiene styrene) 3Dprinted on RepRap 3D device that works on the "open source" principle. The article presents the outcomes of non-destructive materials test in the form of the data from the Laser Amplified Ultrasonography, microscopic observations of the joints area and tensile tests of the specially designed samples. The samples with designed joints were additively manufactured of two materials: specially blended PLA (Market name – PLA Tough) and conventionally made ABS. The tests are mainly focused on the determination of the quality of material connection in the joints area. Based on the results obtained, the samples made of two materials were compared in the end to establish which produced material joint is stronger and have a lower amount of defects.

scholarly journals The Examination of Restrained Joints Created in the Process of Multi-Material FFF Additive Manufacturing Technology

Materials ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 903 ◽  
Author(s):  
Janusz Kluczyński ◽  
Lucjan Śnieżek ◽  
Alexander Kravcov ◽  
Krzysztof Grzelak ◽  
Pavel Svoboda ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Three Dimensional ◽  
Acrylonitrile Butadiene Styrene ◽  
Tensile Tests ◽  
Lower Amount ◽  
Internal Quality ◽  
Experimental Production ◽  
Destructive Testing ◽  
Non Destructive

The paper is focused on the examination of the internal quality of joints created in a multi-material additive manufacturing process. The main part of the work focuses on experimental production and non-destructive testing of restrained joints of modified PLA (polylactic acid) and ABS (Acrylonitrile butadiene styrene) three-dimensional (3D)-printed on RepRap 3D device that works on the “open source” principle. The article presents the outcomes of a non-destructive materials test in the form of the data from the Laser Amplified Ultrasonography, microscopic observations of the joints area and tensile tests of the specially designed samples. The samples with designed joints were additively manufactured of two materials: Specially blended PLA (Market name—PLA Tough) and conventionally made ABS. The tests are mainly focused on the determination of the quality of material connection in the joints area. Based on the results obtained, the samples made of two materials were compared in the end to establish which produced material joint is stronger and have a lower amount of defects.

INVESTIGATION OF TRANSVERSE CRACKS IN ANNULAR WELDED JOINTS OF MAIN GAS PIPELINES LINEAR PART

2021 ◽  
pp. 34-41
Author(s):  
V. A. Zaznobin ◽  
A. V. Nekrasov ◽  
A. V. Pankratov
Keyword(s):  
Welded Joints ◽  
Linear Part ◽  
Correct Identification ◽  
Gas Pipelines ◽  
Destructive Testing ◽  
Transverse Cracks ◽  
Additional Control ◽  
Non Destructive

Statistics of accidents and incidents on main gas pipelines in recent years indicate that almost half of the technogenic events occur due to depressurization in the area of annular welded joints, mainly joints containing defects made during construction and installation work during the construction of gas pipelines. The assessment of the degree of danger and the timing of external inspection and repair or replacement of defective annular welded joints largely depends on the quality of non-destructive testing, the correct identification of the types of defects and the objective determination of their geometric dimensions. To increase the reliability of the assessment of the degree of danger of the detected defects, it is necessary to use additional control methods, in particular, destructive ones. The paper presents the results of surveys and tests of metal fragments of annular welded joints of main gas pipelines containing transverse cracks of annular welded joints in order to determine the causes of the formation of these defects and to assess the degree of danger of the detected transverse cracks of the installation welds of main gas pipelines.

scholarly journals Quality Assessment of Road Shoulders using Light Weight Deflectometer and Geogauge

2019 ◽  
Vol 8 (2) ◽  
pp. 3107-3114
Keyword(s):  
Cost Effective ◽  
Standard Test ◽  
Dry Density ◽  
Light Weight ◽  
Destructive Testing ◽  
The Road ◽  
Light Weight Deflectometer ◽  
Non Destructive

Shoulders are an important element of the highways that provide space for vehicles to stop during an emergency. A well-compacted shoulder provides structural firmness to a pavement by transferring overlying traffic loads to the underlying soil stratum. They provide lateral support to the pavement. In recent years, the use of non-destructive testing devices like Geogauge and Light Weight Deflectometer (LWD) has emerged in our country. The main reason behind this is the inbuilt ability of Geogauge and LWD in the fast estimation of the elastic modulus of a shoulder on top of their ease to port, being cost-effective, the capability to give more amounts of data, etc. Thus, there is a need to assess these devices. The main objective of this paper is to develop correlations between the parameter obtained from these non-destructive devices and destructive test parameterslike dry density and CBR. The tests were conducted on thirty-two locations of road shoulders at the city of Patna, India. Geogauge, LWD and sand replacement or sand cone testing were performed at different locations and soil samples were collected for determination of CBR and water content in the laboratory. The result of regression analysis shows that a significant correlation exists between moduli obtained from the devices under investigation and standard test results i.e. dry density and CBR. These developed correlations may be used by the road engineers for assessment of the quality of the shoulders.

Non-destructive quality control methods in additive manufacturing: a survey

2020 ◽  
Vol 26 (4) ◽  
pp. 777-790 ◽  
Author(s):  
Paschalis Charalampous ◽  
Ioannis Kostavelis ◽  
Dimitrios Tzovaras
Keyword(s):  
Quality Control ◽  
Additive Manufacturing ◽  
Complex Objects ◽  
Destructive Testing ◽  
Content Type ◽  
Wide Range ◽  
Manufacturing Procedure ◽  
Direct Energy ◽  
Non Destructive

Purpose In recent years, additive manufacturing (AM) technology has been acknowledged as an efficient method for producing geometrical complex objects with a wide range of applications. However, dimensional inaccuracies and presence of defects hinder the broad adaption of AM procedures. These factors arouse concerns regarding the quality of the products produced with AM and the utilization of quality control (QC) techniques constitutes a must to further support this emerging technology. This paper aims to assist researchers to obtain a clear sight of what are the trends and what has been inspected so far concerning non-destructive testing (NDT) QC methods in AM. Design/methodology/approach In this paper, a survey on research advances on non-destructive QC procedures used in AM technology has been conducted. The paper is organized as follows: Section 2 discusses the existing NDT methods applied for the examination of the feedstock material, i.e. incoming quality control (IQC). Section 3 outlines the inspection methods for in situ QC, while Section 4 presents the methods of NDT applied after the manufacturing process i.e. outgoing QC methods. In Section 5, statistical QC methods used in AM technologies are documented. Future trends and challenges are included in Section 6 and conclusions are drawn in Section 7. Findings The primary scope of the study is to present the available and reliable NDT methods applied in every AM technology and all stages of the process. Most of the developed techniques so far are concentrated mainly in the inspection of the manufactured part during and post the AM process, compared to prior to the procedure. Moreover, material extrusion, direct energy deposition and powder bed processes are the focal points of the research in NDT methods applied in AM. Originality/value This literature review paper is the first to collect the latest and the most compatible techniques to evaluate the quality of parts produced by the main AM processes prior, during and after the manufacturing procedure.

scholarly journals UNFORMALIZED ASPECTS OF APPLICATION THE NON-DESTRUCTIVE METHODS FOR DETERMINATION OF CONCRETE QUALITY ON ROAD CONCRETE COATINGS

2021 ◽  
pp. 36-45
Author(s):  
V. V. KOLOKHOV ◽  
L.V. MOROZ ◽  
V.L. МОМОТ ◽  
V. V. BYLIK ◽  
S.M. BOHDAN
Keyword(s):  
Concrete Surface ◽  
Concrete Pavements ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Elastic Rebound ◽  
Acoustic Contact ◽  
Non Destructive ◽  
Destructive Methods

Formulation the problem. Experience with the use of non-destructive testing devices shows that theadjustment of calibration dependences in the conditions of damaged concrete surfaces is difficult. Usually quantitativeanalysis is replaced by qualitative, and methods that allow you to return to the quantitative assessment are notstandardized. That is, the adequacy of property definitions needs to be increased. The purpose of the study is todetermine the possibilities of increasing the adequacy in the using of non-destructive testing devices and to study theinfluence of the peculiarities of the technology of manufacturing concrete pavements on the measurement results.Results: It has been performed a visual inspection of the condition of the coating structure on the basis of currentregulations. The study was performed using an ultrasonic device "Novotest IPSM-U" and a device "Onyx 2.5" (shockpulse method). Measurements were performed both on the surface of the concrete pavement and on the samples takenfrom the structure. During the work, project materials and passports for the concrete mixture were used. Conclusions.Studies have shown that: to obtain evidence-based results in the application of non-destructive methods for determiningthe quality of concrete road pavements, existing methods need to be improved and formalized; it needs to be clarifiedand formalized the methods of providing acoustic contact of receivers − transmitters of ultrasonic vibrations with theconcrete surface and the conditions of interaction the indentors with the concrete surface during the implementation ofthe method of elastic rebound; it is necessary to develop and standartize a method for determining the properties of theconcrete mixture based on the properties of concrete.

Determination of neutron image quality of compact collimator facility for non-destructive testing

2021 ◽  
Vol 16 (02) ◽  
pp. P02004-P02004
Author(s):  
T. Chulapakorn ◽  
S. Wonglee ◽  
W. Pornroongruengchok ◽  
T. Liamsuwan ◽  
S. Kotayee
Keyword(s):  
Image Quality ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Neutron Image ◽  
Non Destructive

The Agricultural Products Deterioration Recognition Based on Computer Vision

2014 ◽  
Vol 602-605 ◽  
pp. 2027-2030
Author(s):  
Xiang Jie Niu ◽  
Bin Lan
Keyword(s):  
Computer Vision ◽  
Visual Information ◽  
Agricultural Products ◽  
Internal Quality ◽  
Destructive Testing ◽  
Computer Vision Technology ◽  
Nmr Techniques ◽  
The Relationship ◽  
Non Destructive

The computer vision technology is an important branch of computer science and artificial intelligence which is regarded as a non-destructive testing technique in the field of agriculture with a broad application prospects. This paper introduces the application of the computer vision technology in the agricultural products deterioration recognition, builds foundations for the accurate measurement of the agricultural products quality with computer visions, and establish the relationship between the feature information and quality of the agricultural products. Meanwhile, this paper combined the computer vision technology with infrared, microwave, NMR techniques to extract and test the visual information of the internal quality of the agricultural products.

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