scholarly journals Part Qualification Methodology for Composite Aircraft Components Using Acoustic Emission Monitoring

2018 ◽  
Vol 8 (9) ◽  
pp. 1490 ◽  
Author(s):  
Shane Esola ◽  
Brian Wisner ◽  
Prashanth Vanniamparambil ◽  
John Geriguis ◽  
Antonios Kontsos
Keyword(s):  
Acoustic Emission ◽  
Evaluation Method ◽  
Limit Load ◽  
Structural Testing ◽  
Post Processing ◽  
Testing Procedures ◽  
Additional Information ◽  
Industry Standards ◽  
Felicity Ratio ◽  
Structural Loading

The research presented in this article aims to demonstrate how acoustic emission (AE) monitoring can be implemented in an industrial setting to assist with part qualification, as mandated by related industry standards. The combined structural and nondestructive evaluation method presented departs from the traditional pass/fail criteria used for part qualification, and contributes toward a multi-dimensional assessment by taking advantage of AE data recorded during structural testing. To demonstrate the application of this method, 16 composite fixed-wing-aircraft spars were tested using a structural loading sequence designed around a manufacturer-specified design limit load (DLL). Increasing mechanical loads, expressed as a function of DLL were applied in a load-unload-reload pattern so that AE activity trends could be evaluated. In particular, the widely used Felicity ratio (FR) was calculated in conjunction with specific AE data post-processing, which allowed for spar test classification in terms of apparent damage behavior. To support such analysis and to identify damage critical regions in the spars, AE activity location analysis was also employed. Furthermore, recorded AE data were used to perform statistical analysis to demonstrate how AE datasets collected during part qualification could augment testing conclusions by providing additional information as compared to traditional strength testing frequently employed e.g., in the aerospace industry. In this context, AE data post-processing is presented in conjunction with ultimate strength information, and it is generally shown that the incorporation of AE monitoring is justified in such critical part qualification testing procedures.

Development of Corrosion Depth Evaluation Method in Steel Pipe by Acoustic Emission Method

2021 ◽  
Vol 70 (2) ◽  
pp. 40-46
Author(s):  
Takuya Kurihara ◽  
Matsuo Takuma ◽  
Taro Kono ◽  
Kaori Numata
Keyword(s):  
Acoustic Emission ◽  
Evaluation Method ◽  
Steel Pipe ◽  
Acoustic Emission Method ◽  
Emission Method ◽  
Corrosion Depth

scholarly journals Effect of the Reinforcement Phase on Indentation Resistance and Damage Characterization of Glass/Epoxy Laminates Using Acoustic Emission Monitoring

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
C. Suresh Kumar ◽  
K. Saravanakumar ◽  
P. Prathap ◽  
M. Prince ◽  
G. Bharathiraja ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Glass Fiber ◽  
Research Work ◽  
Low Velocity Impact ◽  
Low Velocity ◽  
Cumulative Energy ◽  
Static Indentation ◽  
Felicity Ratio ◽  
Woven Glass Fiber ◽  
Energy Absorbing

The effect of reinforcement phases on indentation resistance and damage behavior of glass/epoxy laminates was investigated in this research work. Woven glass fiber mat and nonwoven chopped glass fiber mat were used as fiber reinforcement phases for fabricating the laminates. Low-velocity impact and quasi-static indentation tests were performed on both laminates to investigate the contact behavior and energy-absorbing capability. Moreover, the acoustic emission (AE) technique was employed to monitor the indentation damage resistance. AE parameters including normalized cumulative counts (NCC), normalized cumulative energy (NCE), rise angle (RA), and felicity ratio (FR) were analyzed. The bidirectional laminates showed premature load drops and drastic changes in the normalized cumulative counts/energy profile in the beginning of loading cycles, indicating the development of macrodamage such as debonding/delamination. AE sentry function results of bidirectional laminates show longer PII function at the earlier stages, associated with minor PIII function and greater PIV function, indicating the continuous degradation and progression of damage. In contrast, the chopped laminates exhibited superior postimpact performance than the bidirectional laminates. The presence of randomly oriented fibres prevents the delamination crack propagation during compression loading, which was attributed with the increased residual compressive strength.

A Validated Methodology to Establish Structural Capacities for Subsea Connector Families

2021 ◽  
Author(s):  
Michael John Stephens ◽  
Simon John Roberts ◽  
Derek James Bennet
Keyword(s):  
Failure Modes ◽  
Bending Moment ◽  
Full Scale ◽  
Structural Testing ◽  
Combined Loading ◽  
Test Sequence ◽  
Fea Model ◽  
Analysis Methodology ◽  
Industry Standards ◽  
Physical Testing

Abstract Understanding the structural limits of subsea connectors used in offshore environments is critical to ensure safe operations. The latest industry standards establish the requirement for physical testing to validate analysis methodologies for connector designs. In this paper, an analysis methodology, compliant with the latest API 17G standard, is presented for calculating structural capacities of non-preloaded connectors. The methodology has been developed for complex combined loading scenarios and validated using full-scale physical testing for different connector families. Detailed 3-D, non-linear, finite element models were developed for three different non-preloaded connections, which consisted of threaded and load shoulder connectors. A comprehensive set of combined tension and bending moment structural capacities at normal, extreme and survival conditions were calculated for each connection. The calculated capacities were validated for each connection by performing a test sequence using full-scale structural testing. A final tension or bending to failure test was also completed for each test connection to validate the physical failure mode, exceeding the latest API 17G requirements. For all connections tested, capacities calculated using the methodology were validated from the successful completion of the test sequences. The physical failure modes of the test connections also matched the predicted failure modes from the FEA, and the tensile or bending moment loading at physical collapse exceeded that predicted by the global collapse of the FEA model. Using the validated approach described in this paper significantly reduces the requirement of physical testing for connector families, establishing confidence in the structural limits that are critical for safe operations.

Introduction of CASS Pipe Flaw Evaluation of JSME Rules on Fitness for Service

2019 ◽  
Author(s):  
Kiminobu Hojo
Keyword(s):  
Stainless Steel ◽  
Evaluation Method ◽  
Limit Load ◽  
Evaluation Procedure ◽  
Screening Criteria ◽  
Steel Pipes ◽  
Evaluation Procedures ◽  
Degradation Models ◽  
Fracture Tests ◽  
Cast Stainless Steel

Abstract This paper summarizes the revised flaw evaluation procedures for cast austenitic stainless steel (CASS) pipe of the Japan Society of Mechanical Engineers (JSME) rules on fitness for service (FFS) in 2018 addenda. The revision includes the introduction of thermal aging degradation models for stressstrain curve and fracture resistance (J-R) curve, application of a screening criteria for the fracture evaluation procedure of cast stainless steel pipes, and introduction of a new critical stress parameter for the limit load evaluation method of a shallow flaw with a flaw depth to thickness ratio of less than or equal to 0.5. These revisions are based on a large database of specimen tests and several fracture tests of flat plate and large pipe models using thermally aged material, which have already been published.

scholarly journals Novel evaluation method of acoustic emission data based on statistical fiber bundle cells

2019 ◽  
Vol 53 (17) ◽  
pp. 2429-2446
Author(s):  
László M Vas ◽  
Zoltán Kocsis ◽  
Tibor Czigány ◽  
Péter Tamás ◽  
Gábor Romhány
Keyword(s):  
Acoustic Emission ◽  
Fiber Bundle ◽  
Evaluation Method ◽  
Emission Data

scholarly journals Application of capillary electrophoresis in the analysis of coloring matter on paper

2017 ◽  
Vol 44 ◽  
pp. 23-40
Author(s):  
Małgorzata Król
Keyword(s):  
Capillary Electrophoresis ◽  
Law Enforcement ◽  
Chemical Analysis ◽  
Molecular Mass ◽  
Law Enforcement Agencies ◽  
Testing Procedures ◽  
Additional Information ◽  
Detection Systems ◽  
Coloring Matter

Modern law enforcement agencies are constantly struggling with crimes against documents. Due to increasing quality of counterfeit documents and different physicochem­ical properties of inks, such crimes are becoming harder to detect. This situation obliges forensic laboratories for the development and implementation of testing procedures with the use of some modern techniques of chemical analysis. CE opens up numerous possibilities for various analytical applications, mainly due to its numerous advantages, the diversity of its modes and the compatibility with different detection systems. This study focuses on discussing two modes of CE: CZE and MECC and three different detection systems: DAD, LIF and MS. By using them information about substances exhibiting absorption, fluorescence and about molecular mass of analyzed compound can be received. In the Laboratory for Forensic Chemistry many different coloring matters were examined, including ballpoint, fountain pen, gel and stamp pad inks in most popular colors as well as a large group of branded and off-brand printing inks.The obtained results showed the great applicability of CE-DAD method. It has been proved that LIF and MS detections improve the discriminating possibilities of CE provid­ing additional information on samples.

scholarly journals EN 17650 – The new standard for digital preservation of cinematographic works

2021 ◽  
Vol 2021 (1) ◽  
pp. 43-46
Author(s):  
Siegfried Foessel ◽  
Heiko Sparenberg
Keyword(s):  
Digital Preservation ◽  
Data Integrity ◽  
European Standard ◽  
Additional Information ◽  
Industry Standards ◽  
Logical Structures

EN 17650 is a proposed new European Standard for the digital preservation of cinematographic works. It allows organizing of content in a systematic way, the so called Cinema Preservation Package (CPP). The standard defines methods to store content in physical and logical structures and describes relationships and metadata for its components. The CPP uses existing XML schemes, in particular METS, EBUCore and PREMIS to store structural, descriptive, technical and provenance metadata. METS XML files with their core metadata contain physical and logical structures of the content, hash values and UUIDs to ensure data integrity and links to external metadata files to enrich the content with additional information. The content itself is stored based on existing public and industry standards, avoiding unnecessary conversion steps. The paper explains the concepts behind the new standard and specifies the usage and combinations of existing schemes with newly introduced metadata parameters.

Fracture Evaluation of Ni-Based Alloy Weld Joint of Cylindrical Model Subjected to 4-Point Bending or Inner Pressure

2011 ◽  
Author(s):  
Kazuo Ogawa ◽  
Kiminobu Hojo ◽  
Itaru Muroya ◽  
Youichi Iwamoto ◽  
Naoki Ogawa
Keyword(s):  
Weld Joint ◽  
Room Temperature ◽  
Evaluation Method ◽  
Limit Load ◽  
Initial Surface ◽  
Inner Pressure ◽  
Maximum Test ◽  
Bending Load ◽  
Load Evaluation ◽  
Alloy Weld

For the purpose of establishing fracture evaluation method of nickel based alloy weld of nuclear power plants, fracture tests using pipe models (8B and 14B for bending, 12B for inner pressure) with an alloy 132 weld joint have been performed at room temperature and high temperature (325°C). The predicted loads calculated by limit load evaluation method using the measured and code regulated flow stresses were compared with the maximum test loads. And the predicted bending loads of the pipes at 325°C (8B and 14B) and at room temperature (8B) with the initial surface crack whose depth is 75% of the pipe thickness were in good agreement with the maximum test loads. Also the predicted inner pressure of the pipe at room temperature (12B) agreed with the measured maximum pressure. Only for one case of the 14B pipe subjected to the bending load at room temperature, the predicted load by limit load evaluation method has 20% unconservative difference from the measured data, on the other hand, the predicted load by J-T analysis made this difference smaller and conservative.

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