scholarly journals SOME RESULTS OF STUDIES OF THERMAL FIELDS OF CARBON YARNS

2021 ◽  
Vol 161 ◽  
pp. 3-9
Author(s):  
R.S. Akhmetkhanov ◽  
E.F. Dubinin ◽  
M.B. Modestov ◽  
A.A. Shul’zhenko
Keyword(s):  
Thermal Properties ◽  
Cross Section ◽  
Fractal Geometry ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Thermal Fields ◽  
Testing Techniques ◽  
The Cross ◽  
Non Destructive

In the present work, a study of the thermal properties of a carbon yarn was carried out. Were obtained different thermal fields at different structures of the carbon yarn. It was found that thermal fields are highly heterogeneous in the presence of defects in the form of nodes. The novelty of the work is the synthesis of the structure of the cross-section of a carbon yarn using fractal geometry methods. The results of the work can be used in the development of non-destructive testing techniques and in the design of woven electric heaters

Acoustic and Photoacoustic Inspection of Through-Silicon Vias in the GHz-Frequency Band

2017 ◽  
Author(s):  
Sebastian Brand ◽  
Michael Kögel ◽  
Frank Altmann ◽  
Ingrid DeWolf ◽  
Ahmad Khaled ◽  
...  
Keyword(s):  
Quality Assessment ◽  
Frequency Band ◽  
Process Development ◽  
Three Dimensional ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Vertical Interconnection ◽  
Testing Techniques ◽  
Silicon Vias ◽  
Non Destructive

Abstract Through Silicon Via (TSV) is the most promising technology for vertical interconnection in novel three-dimensional chip architectures. Reliability and quality assessment necessary for process development and manufacturing require appropriate non-destructive testing techniques to detect cracks and delamination defects with sufficient penetration and imaging capabilities. The current paper presents the application of two acoustically based methods operating in the GHz-frequency band for the assessment of the integrity of TSV structures.

Ultrasonic Imaging System Based on Virtual Instrument

2013 ◽  
Vol 663 ◽  
pp. 616-620
Author(s):  
Yu Gong ◽  
Yue Gang Hu ◽  
Guo Rong Song ◽  
Cun Fu He ◽  
Bin Wu
Keyword(s):  
Cross Section ◽  
Virtual Instrument ◽  
Imaging System ◽  
Complex Structures ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Bulk Metal ◽  
Instrument Technology ◽  
Control Devices ◽  
Non Destructive

An imaging system of ultrasonic detection is presented for non-destructive testing (NDT) of complex structures by using virtual instrument technology. The control devices for C-scan as well as for imaging system are designed and manufactured. In the coarse scan mode with the scan step of 1 mm, the system can quickly give an image display of a cross section of 80 mm (L) ×60 mm (D) by one measurement. In the refined scan model, the system can show a refine image of the coin. All experiments on coin, bulk metal, and other forms of specimen verify the efficiency of the proposed method. The experimental results are accurate and reliable.

scholarly journals Porosity and Inclusion Detection in CFRP by Infrared Thermography

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
C. Toscano ◽  
C. Meola ◽  
M. C. Iorio ◽  
G. M. Carlomagno
Keyword(s):  
Infrared Thermography ◽  
Production Costs ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Evaluation Methodologies ◽  
Slag Inclusions ◽  
Aeronautical Industry ◽  
Testing Techniques ◽  
Lock In ◽  
Non Destructive

The ever wide use of composite materials in the aeronautical industry has evidenced the need for development of ever more effective nondestructive evaluation methodologies in order to reduce rejected parts and to optimize production costs. Infrared thermography has been recently enclosed amongst the standardized non destructive testing techniques, but its usefulness needs still complete assessment since it can be employed in several different arrangements and for many purposes. In this work, the possibility to detect slag inclusions and porosity is analyzed with both lock-in themography and pulse thermography in the transmission mode. To this end, carbon-fiber-peinforced polymers different specimens are specifically fabricated of several different stacking sequences and with embedded slag inclusions and porosity percentages. As main results, both of the techniques are found definitely able to reveal the presence of the defects above mentioned. Moreover, these techniques could be considered complementary in order to better characterize the nature of the detected defects.

Three Non-Destructive Methods for the Modulus of Elasticity of the Trachea

2004 ◽  
Author(s):  
V. Hermawan ◽  
A. M. Al-Jumaily ◽  
M. Fatemi
Keyword(s):  
Modulus Of Elasticity ◽  
Radial Strain ◽  
Propagation Path ◽  
Non Destructive Testing ◽  
Thin Cylindrical Shell ◽  
Destructive Testing ◽  
Pros And Cons ◽  
Testing Techniques ◽  
Non Destructive ◽  
Practical Recommendations

Three non-destructive testing techniques are developed and investigated to determine the Young’s modulus of elasticity of the trachea and the results are compared with the standard uniaxial state of stress method. These techniques are based on: (1) simulating the trachea as a pressurized vessel and deducing a special relationship between the pressure and the radial strain; (2) using two hydrophones and determining the variation in acoustic transmittance caused by the presence of the trachea in a propagation path within a water-bath; (3) considering the trachea as a thin cylindrical shell and determining the resonance radial vibration response. Discussion is presented to identify the “pros” and “cons” of each technique and final practical recommendations are made.

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