scholarly journals Numerical simulation of ultrasonic testing reliability of civil aircraft considering the influence of the angle between the sound beam axis and the crack orientation

2020 ◽  
Vol 715 ◽  
pp. 012012
Author(s):  
Pei Qiang Tian ◽  
Yun Wen Feng ◽  
Shao Zheng Zhan ◽  
XueLiang Zhang ◽  
XiaoFeng Xue
Keyword(s):  
Numerical Simulation ◽  
Ultrasonic Testing ◽  
Beam Axis ◽  
Crack Orientation ◽  
Sound Beam ◽  
Civil Aircraft

Numerical Simulation of Ring-Shape Rock Failure under Compressive Loading

2011 ◽  
Vol 378-379 ◽  
pp. 15-18
Author(s):  
Yong Bin Zhang ◽  
Zheng Zhao Liang ◽  
Shi Bin Tang ◽  
Jing Hui Jia
Keyword(s):  
Numerical Simulation ◽  
Fracture Process ◽  
Failure Modes ◽  
Failure Process ◽  
Compressive Loading ◽  
Orientation Angle ◽  
Crack Orientation ◽  
Ring Specimen ◽  
Ring Shape ◽  
Good Agreement

In this paper, a ring shaped numerical specimen is used to studying the failure process in brittle materials. The ring specimen is subjected to a compressive diametral load and contains two angled central cracks. Numerical modeling in this study is performed. It is shown that the obtained numerical results are in a very good agreement with the experiments. Effect of the crack orientation angle on the failure modes and loading-displace responses is discussed. In the range of 0°~40°, the fracture paths are curvilinear forms starting from the tip of pre-existing cracks and grow towards the loading points. For the crack orientation angle 90°, vertical fractures will split the specimen and the horizontal cracks do not influence the fracture process.

Impact test and numerical simulation of typical sub-cargo fuselage section of civil aircraft

2020 ◽  
Vol 107 ◽  
pp. 106305
Author(s):  
Haolei Mou ◽  
Jiang Xie ◽  
Yi Liu ◽  
Kun Cheng ◽  
Zhenyu Feng
Keyword(s):  
Numerical Simulation ◽  
Impact Test ◽  
Civil Aircraft

scholarly journals Research on Simulation and Performance Optimization of Mach 4 Civil Aircraft Propulsion Concept

2019 ◽  
Vol 2019 ◽  
pp. 1-19
Author(s):  
Min Chen ◽  
Zihao Jia ◽  
Hailong Tang ◽  
Yi Xiao ◽  
Yonghang Yang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Prediction Model ◽  
Conceptual Design ◽  
Performance Optimization ◽  
Jet Noise ◽  
Aircraft Engine ◽  
Requirement Analysis ◽  
Task Requirement ◽  
Civil Aircraft ◽  
And Performance

Supersonic civil aircraft is of a promising area in the development of future civil transport, and aircraft propulsion system is one of the key issues which determine the success of the aircraft. To get a good conceptual design and performance investigation of the supersonic civil aircraft engine, in this article, a fast, versatile as well as trust-worthy numerical simulation platform was established to analyze the Mach 4 turbine-based combined cycle (TBCC) engine concept so as to be applied to the supersonic civil aircraft. First, a quick and accurate task requirement analysis module was newly established to analyze the mission requirement of the Mach 4 supersonic civil aircraft. Second, the TBCC engine performance simulation model was briefly presented and the number of engines on the supersonic civil aircraft was analyzed, considering single engine inoperative. Third, the Stone model and the DLR method were investigated to estimate the engine jet noise and the NOx emission of the Mach 4 supersonic civil aircraft. Finally, a multiobjective optimization tool made up of a response surface method and a genetic algorithm was developed to optimize the design parameters and the control law of the TBCC engine, in order to make the Mach 4 supersonic civil aircraft engine with better performance, lower noise, and lower emissions. The uniqueness of the developed analysis tool lies in that it affords a numerical simulation platform capable of investigating the task requirement analysis module of the supersonic civil aircraft, engine jet noise prediction model, and the NOx emission prediction model, as well as a multiobjective performance optimization tool, which is beneficial for the conceptual design and performance research of Mach 4 supersonic civil aircraft’s propulsion system.

Ultrasonic Testing Numerical Simulation of Austenitic Stainless Steel Pipeline Welding Cladding

2014 ◽  
Vol 687-691 ◽  
pp. 878-881 ◽  
Author(s):  
Fu Xiang Wei ◽  
Gen Xi Yu ◽  
Zhi Ling Wang
Keyword(s):  
Numerical Simulation ◽  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Ultrasonic Testing ◽  
Optimum Frequency ◽  
Steel Pipeline ◽  
Small Defect ◽  
Pipeline Welding ◽  
Section Result

In the paper, ultrasonic testing of austenitic stainless steel pipeline welding cladding is stimulated based on ultrasonic testing software CIVA. The result shows that the frequency is higher; the sensitivity on small defect testing is higher. When cylindrical defect with length of 6mm and diameter of 2mm is detected, the frequency is higher, the tested length-section result is more accurate, and the width-section (i.e., diameter) is not affected. The optimum frequency scope for testing the defect should be between 5MHz and 10MHz.

Non-Destructive Testing in Aircraft Servicing

1966 ◽  
Vol 70 (666) ◽  
pp. 632-638
Author(s):  
M. Murden
Keyword(s):  
Ultrasonic Testing ◽  
Early Stage ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
New Techniques ◽  
Basic Principles ◽  
Current Testing ◽  
Mandatory Requirement ◽  
Civil Aircraft ◽  
Non Destructive

SummaryDuring recent years, with the introduction of more complex aircraft structures, new techniques of aircraft servicing have been needed. It is essential to find even the smallest defects at a very early stage, but costly strip-examination must be avoided so far as possible.Non-destructive testing is now playing an important part in this field, but many aeronautical engineers are unaware of the capabilities and limitations of the main methods.This paper sets out to explain the basic principles of radiography, ultrasonic testing and eddy current testing. Since sampling inspections using these methods are now a mandatory requirement on all civil aircraft the paper should be of interest to all readers.

Numerical simulation of length-limited parametric sound beam

2012 ◽  
Author(s):  
Hideyuki Nomura ◽  
Claes M. Hedberg ◽  
Tomoo Kamakura
Keyword(s):  
Numerical Simulation ◽  
Sound Beam

An Improved Phased Array Ultrasonic Testing Technique for Thick-Wall Polyethylene Pipe Used in Nuclear Power Plant

2018 ◽  
Author(s):  
Yinkang Qin ◽  
Jianfeng Shi ◽  
Jinyang Zheng
Keyword(s):  
Numerical Simulation ◽  
Ultrasonic Testing ◽  
Nuclear Power ◽  
Phased Array ◽  
Propagation Distance ◽  
Ultrasonic Field ◽  
Thick Wall ◽  
Acoustic Attenuation ◽  
Waveform Distortion ◽  
Attenuation And Dispersion

With the application of High-density polyethylene (HDPE) pipe with thick wall in nuclear power plant (NPP), great attention has been paid to the safety of the pipeline’s joints, which can be assessed by phased array ultrasonic testing (PAUT). PAUT creates constructive interference of acoustic waves to generate focused beams according to delay law based on time-of-flight. However, due to the existence of acoustic attenuation and dispersion, waveform distortion occurs when ultrasonic pulse propagates in HDPE, which will accumulate with the increase of propagation distance, and then results in imaging errors. In this paper, the relationship of acoustic attenuation and dispersion in HDPE was obtained by numerical simulation in Field II®, which can be verified by the experiment of our previous work. Besides, the investigation of the waveform distortion revealed the linear relation between peak offset and propagation distance. Considering the relation, an improved delay law was proposed to increase the intensity of ultrasonic field. This improved delay law was compared with the conventional one by numerical simulation of ultrasonic field and PAUT experiments, which showed that the improved delay law could increase the image sensitivity.

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