scholarly journals Chestnut wood in compression perpendicular to the grain: Non-destructive correlations for test results in new and old wood

2007 ◽  
Vol 21 (8) ◽  
pp. 1617-1627 ◽  
Author(s):  
Paulo B. Lourenço ◽  
Artur O. Feio ◽  
José S. Machado
Keyword(s):  
Test Results ◽  
Non Destructive ◽  
Chestnut Wood

scholarly journals APLIKASI NON DESTRUCTIVE TEST PENETRANT TESTING (NDT-PT) UNTUK ANALISIS HASIL PENGELASAN SMAW 3G BUTT JOINT

2017 ◽  
Vol 3 (2) ◽  
Author(s):  
Tito Endramawan ◽  
Emin Haris ◽  
Felix Dionisius ◽  
Yuliana Prinka
Keyword(s):  
Mild Steel ◽  
Welding Process ◽  
Butt Joint ◽  
Test Results ◽  
Acceptance Criteria ◽  
Destructive Test ◽  
Non Destructive ◽  
Penetrant Testing

The purpose of the research are determine acceptance criteria the specimen based on ASME standard. The research used mild steel materials with hardness 220 HVN with sized 30 cm x 20 cm x 1.2 cm then  SMAW welding process position of 3G buttjoint with rooting electrode LB 52U diameter 2.6 mm used current 70 Amper and voltage 380 volt, for Filler used LB 5218 electrode 3.2 mm with current of 80 Amper and voltage of 380 volts. The welding process influenced by many factor which cause failure. The method for inspect result of weld used Non Destructive Test Penetrant Testing (NDT PT) and used ASME standard for acceptance criteria. The test results showed the discontinuity of porosity on the surface of the welded product in specimen 1 is the largest rounded 5 mm at 233 mm distance so that based on the acceptance criteria of AWS standard, the welding result is accepted and the specimen 2 there is discontinuity at 233 mm with the size of 8 mm so that Otherwise rejected. This rejected result can be improved by gouging the discontinuity and then welded.

scholarly journals A Comprehensive Report on Ultrasonic Attenuation of Engineering Materials, Including Metals, Ceramics, Polymers, Fiber-Reinforced Composites, Wood, and Rocks

2020 ◽  
Vol 10 (7) ◽  
pp. 2230 ◽  
Author(s):  
Kanji Ono
Keyword(s):  
Rayleigh Scattering ◽  
Ultrasonic Attenuation ◽  
Fiber Reinforced Composites ◽  
Reinforced Composites ◽  
Test Results ◽  
Fiber Reinforced ◽  
Materials Selection ◽  
Linear Frequency ◽  
Engineering Materials ◽  
Non Destructive

In this paper, ultrasonic attenuation of engineering materials is evaluated comprehensively, covering metals, ceramics, polymers, fiber-reinforced composites, wood, and rocks. After verifying two reliable experimental methods, 336 measurements are conducted and their results are tabulated. Attenuation behavior is determined over broadband spectra, extending up to 15 MHz in low attenuating materials. The attenuation spectra are characterized in combination with four power law terms, with many showing linear frequency dependence, with or without Rayleigh scattering. Dislocation damping effects are re-evaluated and a new mechanism is proposed to explain some of the linear frequency dependencies. Additionally, quadratic and cubic dependencies due to Datta–Kinra scattering and Biwa scattering, respectively, are used for some materials to construct model relations. From many test results, some previously hidden behaviors emerged upon data evaluation. Effects of cold working, tempering, and annealing are complex and sometimes contradictory. Comparison to available literature was attempted for some, but most often prior data were unavailable. This collection of new attenuation data will be of value in materials selection and in designing structural health monitoring and non-destructive inspection protocols.

scholarly journals A tomographic approach to assessing the possibility of ring shake presence in standing chestnut trees

2020 ◽  
Vol 78 (6) ◽  
pp. 1137-1148
Author(s):  
Andrea R. Proto ◽  
Maria F. Cataldo ◽  
Corrado Costa ◽  
Salvatore F. Papandrea ◽  
Giuseppe Zimbalatti
Keyword(s):  
Wood Quality ◽  
Castanea Sativa ◽  
Widespread Phenomenon ◽  
Applied Approach ◽  
Tomographic Data ◽  
Local Company ◽  
Tropical Climates ◽  
Tomographic Measurement ◽  
Non Destructive ◽  
Chestnut Wood

Abstract Ring shake is a widespread phenomenon affecting a great number of species of both softwood and hardwood and is found in trees grown in temperate and tropical climates. Chestnut (Castanea sativa Mill.) represents one of the most important hardwood timbers that is very often affected by ring shake. This defect seems to be the only real limit to the spread and use of chestnut wood worldwide on a scale closer to the availability of this wood. The aim of this study was to examine the potential of tomographic measurement as a non-destructive method for predicting the possibility of the presence of ring shake in standing chestnut trees. For this reason, the experiments were carried out in a chestnut coppice stand where one hundred chestnut standards were monitored using an acoustic tomographic device, and subsequently harvested by a local company and cross-sectioned corresponding to the acoustic tests. This work proposed an applied approach to predicting and determining wood quality (sound wood vs. defective wood) from tomographic data. The model, based on a non-linear approach, showed that sonic tomography can identify ring shake in a tree trunk without affecting its biological activity, overcoming the difficulties of predicting ring shake using only visual inspection.

Assessment of a cracked reinforced concrete supporting structure for a converter in a steel melting shop through non-destructive testing and a statistical approach – a case study

2020 ◽  
Vol 62 (11) ◽  
pp. 633-641
Author(s):  
D Das ◽  
S R Debbarma ◽  
D Bouri ◽  
S Banerjee ◽  
S Chatterjee
Keyword(s):  
Reinforced Concrete ◽  
Crack Depth ◽  
Critical Conditions ◽  
Test Sequence ◽  
Steel Melting ◽  
Test Results ◽  
Scientific Review ◽  
Supporting Structure ◽  
Non Destructive

The subject of this paper is the occurrence of cracks and other types of damage, such as delamination of the reinforcement cover, carbonation, porosity, etc, which have occurred in a reinforced concrete supporting structure for a converter in a steel melting shop in India. The structure consists of two thick reinforced concrete walls on which the converter rests. Converters are used in a steel melting shop for blowing oxygen through hot metal and steel is produced through a reaction with carbon, silicon, phosphorus, sulphur, etc. A scientific review of the existing non-destructive test methods is carried out with reference to this case study and critical features of the testing process are described, which will help site engineers to correctly devise the test sequence and analysis procedure for assessment of the structures in specific critical conditions. Crack depth is estimated by analysing test results based on the ultrasonic pulse velocity. The paper explains how appropriate selection of the method and basic parameters is essential for estimating the most accurate crack depth. Lack of understanding of the existing condition of the material of the structure may lead to an incorrect interpretation of the test results. Further to this, a simple statistical procedure is described to identify significant cracks without detailed testing. The repair methodology and its specific features are also discussed in this paper. This case study on the assessment of the converter supporting structure will help engineers to provide solutions for similar types of damaged structure found in industry.

scholarly journals Assessment of Impact of the Rheological Parameters Change on Sensitivity of the Asphalt Strain Based on the Test Results / Ocena Wpływu Zmiany Parametrów Reologicznych Na Wrażliwość Deformacji Mieszanek Mineralno - Asfaltowych Na Podstawie Wyników Badań

2015 ◽  
Vol 16 (1) ◽  
pp. 105-117
Author(s):  
Artur Kurpiel ◽  
Adam Wysokowski
Keyword(s):  
Rheological Properties ◽  
Creep Test ◽  
Creep Curve ◽  
Rheological Model ◽  
Rheological Parameters ◽  
Test Results ◽  
Test Load ◽  
Resistance To Deformation ◽  
The Impact ◽  
Non Destructive

Abstract The creep test under the static loading, that allows to determine rheological properties of asphalt based on the creep curve, is the most effective test nowadays. Applied loads are non-destructive and allow to observe the course of the strain after the test load. The test can be carried out on compressing, shearing, bending as well as on triaxial test, that depends on the applied apparatus implementing different intensity [1, 2, 3, 4, 5, 6]. Based on the creep test, the stress of different properties can be specified. Among them there are valuable rheological properties based on selected viscoelascity models [1]. The properties of the viscoelascity models are relevant indexes depicting resistance to deformation. They can be used to forecast the wheel-truck in the accepted rheological model [1]. In this article it is shown the impact of different rheological properties of the viscoelacity model on the wheel-truck as well as the impact of different properties on shape and the course of the creep curve. The asphalt mixtures presented in this article are characterized by variable rheological properties. It is therefore difficult to determine which property mostly affects the size of the strain. However, the authors of this article attempted to analyse the change of the asphalt strain value of the different variables in particular rheological model, called Bürgers’s model.

scholarly journals The Effect of Environmental Flight Conditions on Damage Propagation in Composite Sandwich Structure

2015 ◽  
Vol 2015 (7) ◽  
pp. 24-27 ◽  
Author(s):  
Piotr Synaszko ◽  
Michał Sałaciński ◽  
Łukasz Kornas
Keyword(s):  
Sandwich Structure ◽  
Test Results ◽  
Damage Growth ◽  
Pulsed Thermography ◽  
Temperature Changes ◽  
Damage Propagation ◽  
Composite Sandwich ◽  
The Core ◽  
Before And After ◽  
Non Destructive

Abstract The aim of the study was to determine the traceability of damage growth caused by inclusions of water in the composite sandwich structure. It was assumed that as a result of temperature changes during the flight and accompanying phase transformation, the zone containing water inclusions increases. The growth is caused by the destruction (mainly the tearing of walls) of the core. As part of the work, this assumption was verified experimentally. For the experiment to be successful it was necessary to simulate actual flight conditions. The simulation involved inducing phase transformations of water in the core cell as a function of time and temperature. Before and after the experiments the non-destructive tests using pulsed thermography were performed. The test results revealed an increase in the number of cells occupied by water. Adequate specimens were designed and manufactured. The study showed that cyclical changes in temperature affected the propagation of water in core sandwich structures. Further, it was found that the increase in the surface area of water-containing inclusions could be monitored using thermographic techniques.

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