Analysis of internal defects in 3D braided composites based on ultrasonic C-scan technique

2020 ◽  
Vol 62 (6) ◽  
pp. 323-330
Author(s):  
Z T Xiao ◽  
Y M Guo ◽  
L Geng ◽  
J Wu ◽  
F Zhang ◽  
...  
Keyword(s):  
Mechanical Performance ◽  
Non Destructive Testing ◽  
Braided Composites ◽  
Destructive Testing ◽  
Artificial Defect ◽  
3D Braided Composites ◽  
Production Processes ◽  
Different Types ◽  
Examination Techniques ◽  
Non Destructive

Defects can form within 3D braided composites as a result of their special production processes, which can affect the mechanical performance of the composites. Thus, it is absolutely essential to test for and analyse different types of defect. This paper reports on the detection of specific artificial defects in 3D braided composites, assessed using an ultrasonic system with typical examination techniques for non-destructive testing (NDT) and employing an ultrasonic C-scan technique to identify the artificial defects. Eight types of artificial defect are embedded and detected in these 3D braided composites. The study shows that this ultrasonic C-scan technique is an effective tool for inspecting the state of failure of 3D braided composites.

scholarly journals CFRP Non-Destructive Testing Using IR Thermography Methods

Proceedings ◽  
2019 ◽  
Vol 27 (1) ◽  
pp. 30
Author(s):  
Swiderski
Keyword(s):  
Construction Materials ◽  
Non Destructive Testing ◽  
Ir Thermography ◽  
Destructive Testing ◽  
Active Infrared Thermography ◽  
Multilayer Composites ◽  
Military Applications ◽  
Different Types ◽  
The Many ◽  
Non Destructive

Multilayer composites reinforced fibres are often used in military applications as construction materials for lightweight ballistic covers that protect against fragments and projectiles. The basic fibre used in these applications is aramid fibre, but research is also conducted using carbon fibres. One of the many methods used in non-destructive testing of composites is active infrared thermography, in which different types of sources can be used to thermally stimulate the material being tested. This paper compares the results obtained with various methods of thermal stimulation in the study of samples made with CFRP with deliberately introduced defects and destructive tests.

Non-Destructive Detection of Weld Seams in Extruded Aluminum Profiles

2013 ◽  
Vol 585 ◽  
pp. 103-110 ◽  
Author(s):  
Marcus Engelhardt ◽  
N. Grittner ◽  
Wilfried Reimche ◽  
Friedrich Wilhelm Bach
Keyword(s):  
Room Temperature ◽  
Current Sensor ◽  
Non Destructive Testing ◽  
Testing Methods ◽  
Destructive Testing ◽  
Porthole Die ◽  
Different Types ◽  
Aluminum Profiles ◽  
Non Destructive ◽  
Weld Seams

The present study focuses on the feasibility of non-destructive testing methods for the detection of transverse and longitudinal weld seams in extruded aluminum alloys. Two extrusion trials using billet on billet extrusion with a porthole die producing both types of weld seams were conducted. First, two billets of different types of alloy, AlMgSi1 (EN AW-6082) and AlZn4.5Mg1 (EN AW-7020), were extruded. In a second trial, two billets of AlZn4.5Mg1 were processed. The produced profiles were then tested by non-destructive testing using a tactile eddy current sensor as well as an encasing sensor at room temperature. The measured signals of both sensors were then evaluated and compared. Microstructural analyses have been carried out to correlate the occurrence of transverse and longitudinal weld seams with the results of the non-destructive testing.

Discussion on the characterisation of hydrogen embrittlement based on eddy current signals

2020 ◽  
Vol 62 (1) ◽  
pp. 11-14
Author(s):  
Haiting Zhou ◽  
Dongdong Ye ◽  
Jianjun Chen ◽  
Qiang Wang ◽  
Xinwei Fan
Keyword(s):  
Hydrogen Embrittlement ◽  
Alloy Steel ◽  
Eddy Current ◽  
Mechanical Performance ◽  
Low Alloy Steel ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Mechanical Responses ◽  
Loss Index ◽  
Non Destructive

A non-destructive testing (NDT) method for evaluating mechanical performance has been studied based on the analysis of eddy current signals. Low-alloy steel samples were tested under conditions of tension with the aim of quantifying hydrogen embrittlement (HE). The mechanical responses of samples were investigated after electrochemical hydrogen charging. Eddy current signals were gathered to evaluate the hydrogen embrittlement state using a differential probe. Numerical analysis of hydrogen concentration distribution in material was performed to investigate the response mechanism of the signal. The effect that hydrogen has on the mechanical performance of low-alloy steel has been discussed. The experimental results show that the eddy current signal has a good correlation with the hydrogen-induced plasticity loss index.

Photothermal Thermography Applied to the Non-destructive Testing of Different Types of Works of Art

2012 ◽  
Vol 33 (10-11) ◽  
pp. 1996-2000 ◽  
Author(s):  
J. L. Bodnar ◽  
K. Mouhoubi ◽  
G. Szatanik-Perrier ◽  
J. M. Vallet ◽  
V. Detalle
Keyword(s):  
Non Destructive Testing ◽  
Destructive Testing ◽  
Works Of Art ◽  
Different Types ◽  
Non Destructive

INSPECTION OF IMPACT DAMAGE IN HONEYCOMB COMPOSITE BY ESPI, THERMOGRAPHY AND ULTRASONIC TESTING

2008 ◽  
Vol 22 (09n11) ◽  
pp. 1033-1038 ◽  
Author(s):  
MANYONG CHOI ◽  
JEONGHAK PARK ◽  
WONTAE KIM ◽  
KISOO KANG
Keyword(s):  
Impact Damage ◽  
Quantitative Estimation ◽  
Non Destructive Testing ◽  
Military Aircraft ◽  
Destructive Testing ◽  
Artificial Defect ◽  
Lead Failure ◽  
Testing Procedures ◽  
Inspection Condition ◽  
Non Destructive

Honeycomb composites are now fairly widely used in civilian and military aircraft structures. Common defects found in these materials are delaminations by impact damage and their presence will lead to structural weaknesses which could lead failure of the airframe structures. It is important to develop effective non-destructive testing procedures to identify these defects and increase the safety of aircraft travel. This paper describes the detection technique of impact damage defect using thermography and ESPI. The results obtained with the two techniques are compared with ultrasonic C-scan testing. The investigation shows that both imaging NDT methods are able to identify the presence of artificial defect and impact damage. The adoption of the thermography allowed significant advantages in inspection condition, and gives smaller error in quantitative estimation of defects.

scholarly journals Effect of the Grain Sizes on the Ultrasonic Propagation and Attenuation on Different Types of Steels Microstructure During Non-Destructive Testing

2021 ◽  
Vol 45 (4) ◽  
pp. 329-334
Author(s):  
Irida Markja ◽  
Klodian Dhoska ◽  
Dervish Elezi ◽  
Reza Moezzi ◽  
Michal Petru
Keyword(s):  
Research Work ◽  
Ultrasonic Waves ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Ultrasonic Signals ◽  
Ultrasound Waves ◽  
Different Types ◽  
Shift Frequency ◽  
Ultrasonic Propagation ◽  
Non Destructive

In this paper we have proposed an experimental study of the steel grains sizes effect on the shift frequency of the ultrasonic waves being propagated in steels. Ultrasonic testing has been used in most inspection services for different materials as non-destructive testing. The novelty of our research work has been focused on the investigation of the new method for determining microstructure evolution of metals by using ultrasonic signals in conjunction with changes in grain size and hardness of steels. Furthermore, we have studied the microstructure of steel types S355, S275, Corten B and S275N. The microstructure results of steels have shown the changes that have been undergone from thermal and mechanical processes by using the attenuation of ultrasound waves during non-destructive testing.

scholarly journals ORIENTATION AND POSITION EFFECTS OF A LOCAL HETEROGENEITY ON FLEXURAL VIBRATION FREQUENCIES IN WOODEN BEAMS

CERNE ◽  
2015 ◽  
Vol 21 (2) ◽  
pp. 339-344
Author(s):  
Mehran Roohnia ◽  
Loïc Brancheriau
Keyword(s):  
Flexural Vibration ◽  
Vibration Frequencies ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Position Effects ◽  
Artificial Defect ◽  
One Dimensional ◽  
Before And After ◽  
Non Destructive

Studying the influence of defect on the dynamic behavior of wood in order to detect the local heterogeneities is of great importance in non-destructive testing of wood. The natural heterogeneities in wood are oriented in a volume. However, one-dimensional models are still used in dynamic characterization of wooden beams. The aim of this study was to experimentally investigate the effects of the orientation and position of an artificial defect on the flexural vibration frequencies. Different batches of Fagus orientalis specimens were drilled in the radial direction at five positions along the specimen. Dynamic tests in free flexural vibration were performed on the specimens before and after drilling both in the longitudinal-radial (LR) and longitudinal-tangential (LT) bending plan. The behavior in free flexural vibration was found to be different depending on the position and orientation of heterogeneity. When the drilling axis lies in the bending plane (LR), the weakening of frequency was maximal at the location of an antinode of vibration. On the contrary, the frequency offset was maximal in the place of a vibration node when the drilling axis was orthogonal to the bending plane (LT).

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