Results 1 - 10 of 137
Results 1 - 10 of 137. Search took: 0.02 seconds
|Sort by: date | relevance|
[en] This paper shows an ability to find internal defects in construction of polymer composite material using THz imaging. Using THz vision system resulted in an example of finding internal non-impregnated area in fiberglass
[en] The paper presents the research findings obtained as a result of the ultrasonic nondestructive testing of flaw detection in one-sided access confined concrete. The ultrasonic nondestructive testing is applied to detect the size and location of internal defects in confined concrete that allows the accurate taking cores and their mechanical testing. Tomographic images of the scanned internal structure are given herein as well as the results of compressive strength testing of cores taken from defective portions of the concrete one-sided access construction. (paper)
[en] This study proposes a damage indicator based on mode shape curvature to localize free-spanning damage of submarine pipeline systems. The feasibility of curvatures of low-frequency mode shapes for localizing free-spanning damage of pipeline systems is discussed, and damage indicators based on mode shape curvatures are proposed. The efficacy of the proposed damage indicators is demonstrated by numerical simulations of dynamic responses of a submarine pipeline under ambient conditions with considering the real subsea environment. The proposed approach is simple, which does not require baseline data, and thus is promising in practical applications.
[en] Lockin-thermography has become a valuable tool for non-destructive testing (NDE) of materials since it provides in a short time phase images of hidden defects. However, besides finding defects it is important to derive more information to characterise them. We present an innovative way to combine phase images obtained at different lockin-frequencies by using scatter plots. Besides defect depths this method of data fusion allows for feature extraction like thermal wave reflection coefficient, local planarity, and edge effects due to the lateral heat flow caused by them. The extracted features can be traced back to the original image.
[en] Considered in this paper, a new method of nondestructive control based on the spectra of radio wave radiation of the microwave range wideband scanning receiver. It is experimentally shown that this method has a high accuracy in the determination of the frequency spectrum. This allows the method considered to reach a sensitivity of 5-6 Hz/nm. (paper)
[en] The issues of increasing the effectiveness of the magnetic particle method of nondestructive testing by using a new flaw detection material is considered in the paper. The requirements for flaw detection materials are determined, which ensure the effectiveness of the inspection method. A new flaw detection material – magnetic fluids from iron-containing waste products – has been developed. (paper)
[en] Precision measuring machine manufacturers have been flooded with requests for more precise measurements. Not only high-accuracy and high-throughput, but also nondestructive and non-contact sensing are demanded for the latest precise measurement machines. It is well known that a variety of fine structures beyond micro-meter scale are formed on the surface of industrial products. Thus it is natural trend that the demand of 3D surface measurement with nano-scale will be drastically increased. Reflecting such a situation, Mitutoyo puts much effort into the development of a variety of measurement systems which satisfy such complex demands as a comprehensive manufacturer. In this report, some of the challenges related to industrial manufacturing will be introduced
[en] The nondestructive testing (NDT) of honeycomb sandwich structures has been the subject of several studies. Classical techniques such as ultrasound testing and x-rays are commonly used to inspect these structures. Holographic interferometry (HI) and infrared thermography (IT) have shown to be interesting alternatives. Holography has been successfully used to detect debonding between the skin and the honeycomb core on honeycomb panels under a controlled environment. Active thermography has proven to effectively identify the most common types of defects (water ingress, debonding, crushed core, surface impacts) normally present in aeronautical honeycomb parts while inspecting large surfaces in a fast manner. This is very attractive for both the inspection during the manufacturing process and for in situ regular NDT assessment. A comparative experimental investigation is discussed herein to evaluate the performance of HI and IT for the NDT on a honeycomb panel with fabricated defects. The main advantages and limitations of both techniques are enumerated and discussed.
[en] In this study, the nondestructive testing (NDT) of tilted subsurface defects with a concave cross section was performed using a photoacoustic microscope (PAM). The tilted subsurface defects were formed in a metal plane specimen by mechanical processing. The obtained signal distribution was affected by the tilt angle of the subsurface defects, and the relationship between the gradient ratio and the tilt angle value exhibited a good correlation.
[en] The currently applied criteria of identification of imperfections based on results of Radiographic Testing have no unambiguous description in regulatory documents. Therefore, there is a lack of coherence between opinions of the experts who are interpreting images on radiographic films. Authors suggest dividing images of imperfections into classes, each of which includes imperfections with similar projections on radiographs. This allows to simplify the identification procedure and to increase repeatability of results of the interpretation which is carried out by different experts independently. (paper)