Destructive and Ultrasonic Investigations of Damage Development in Metallic Materials

2007 ◽  
Vol 340-341 ◽  
pp. 229-234 ◽  
Author(s):  
Zbigniew L. Kowalewski ◽  
Sławomir Mackiewicz ◽  
Jacek Szelażek
Keyword(s):  
Power Plants ◽  
Elevated Temperatures ◽  
Damage Identification ◽  
Damage Development ◽  
Damage Degree ◽  
Yield Loci ◽  
Development Evaluation ◽  
Non Destructive ◽  
Destructive Methods

Damage development due to creep under uniaxial tension at elevated temperatures is assessed using destructive and non-destructive methods in steels, commonly used in power plants or chemical industry, and in aluminium alloy used in aircrafts for responsible elements. The results obtained using two different destructive methods for assessments of damage development are critically discussed. In the first method the specimens of steel after different amounts of creep prestraining were stretched up to failure and variations of the selected tension parameters were taken into account for damage identification. In the second one, a damage degree was evaluated by studying variations of an initial yield locus position in the stress space and by determination of the yield loci dimensions. The ultrasonic investigations were selected as the non-destructive method for damage development evaluation.

EVALUATION OF DAMAGE IN STEELS SUBJECTED TO EXPLOITATION LOADING - DESTRUCTIVE AND NON-DESTRUCTIVE METHODS

2008 ◽  
Vol 22 (31n32) ◽  
pp. 5533-5538 ◽  
Author(s):  
ZBIGNIEW L. KOWALEWSKI ◽  
SŁAWOMIR MACKIEWICZ ◽  
JACEK SZELĄŻEK ◽  
KRYSTYNA PIETRZAK ◽  
BOLESŁAW AUGUSTYNIAK
Keyword(s):  
Plastic Deformation ◽  
Damage Identification ◽  
Ultimate Tensile Stress ◽  
Damage Evaluation ◽  
Damage Development ◽  
Tension Tests ◽  
Magnetic Techniques ◽  
Development Evaluation ◽  
Non Destructive ◽  
Destructive Methods

Damage due to creep and plastic flow is assessed using destructive and non-destructive methods in steels (40HNMA and P91). In the destructive methods the standard tension tests were carried out after prestraining and variations of the selected tension parameters were taken into account for damage identification. In order to assess a damage development during the creep and plastic deformation the tests for both steels were interrupted for a range of the selected strain magnitudes. The ultrasonic and magnetic techniques were used as the non-destructive methods for damage evaluation. The last step of the experimental programme contained microscopic observations. A very promising correlation between parameters of methods for damage development evaluation was achieved. It is well proved for the ultimate tensile stress and birefringence coefficient.

Determination of the Creep Deflection of a Rivet in Double Shear

1959 ◽  
Vol 26 (2) ◽  
pp. 285-290
Author(s):  
Joseph Marin
Keyword(s):  
Theoretical Prediction ◽  
Power Plants ◽  
Elevated Temperatures ◽  
Structural Components ◽  
Double Shear ◽  
Riveted Joints ◽  
Simple Tension ◽  
Riveted Joint ◽  
Jet Power

Abstract Structural components of modern aircraft are subjected to elevated temperatures by jet power plants and by skin friction resulting from supersonic speeds. Some of these high-temperature-aircraft structural components are riveted connections. Considerable experimental data are available on the creep of riveted connections used in aircraft [1]. However, a survey of the literature shows a lack of results on the theoretical prediction of creep in riveted connections from the usual creep and creep-rupture data for simple tension. The creep of a riveted joint is dependent on various factors including rivet diameter, rivet lengths, and plate thicknesses. This influence of size means that each particular riveted joint must be tested to obtain the necessary information. A basic approach to the problem is theoretically to predict the creep behavior of riveted joints from creep in simple tension. One of the important parts of the creep deformation of a riveted connection, Fig. 1(a), is the creep of the rivet. This paper deals with an approximate theoretical prediction of the creep deflection in a rivet based upon the creep constants of the material in simple tension.

scholarly journals Portable XRF: A Tool for the Study of Corundum Gems

2017 ◽  
Vol 3 (1) ◽  
Author(s):  
Germana Barone ◽  
Paolo Mazzoleni ◽  
Danilo Bersani ◽  
Simona Raneri
Keyword(s):  
Spectroscopic Techniques ◽  
Portable Xrf ◽  
Correct Evaluation ◽  
Non Invasive ◽  
Heritage Studies ◽  
Origin Determination ◽  
Non Destructive ◽  
Xrf Spectroscopy ◽  
Destructive Methods

AbstractOrigin of gemstones is a key aspect not only in gemological field but also in Cultural Heritage studies, for the correct evaluation of precious artifacts. The studies on gems require the application of non-invasive and non-destructive methods; among them, portable spectroscopic techniques has been demonstrated as powerful tools, providing a fingerprint of gems for origin and provenance determination. In this study, portable XRF spectroscopy has been applied to test the potential of the technique for the origin determination of corundum gems. The obtained results allowed distinguishing natural and synthetic rubies and sapphires.

Evaluation of Damage Degree of Inconel 718 Alloy with the Use of Non-Destructive Methods

2019 ◽  
Vol 55 (4) ◽  
pp. 299-307
Author(s):  
Józef Krysztofik ◽  
Dominik Kukla ◽  
Wojciech Manaj ◽  
Grzegorz Socha
Keyword(s):  
Inconel 718 ◽  
Inconel 718 Alloy ◽  
Damage Degree ◽  
Non Destructive ◽  
Destructive Methods

Selected Non-Destructive Methods Suitable for Evaluation of Roofing Slate

2014 ◽  
Vol 923 ◽  
pp. 63-70 ◽  
Author(s):  
Martin Vavro ◽  
Kamil Souček ◽  
Tomáš Daněk ◽  
Lubomír Staš
Keyword(s):  
Natural Material ◽  
Petrographic Analysis ◽  
Historical Buildings ◽  
Reliable Determination ◽  
X Ray ◽  
New Methods ◽  
Traditional Natural ◽  
Non Destructive ◽  
Destructive Methods

Roofing slate is a traditional natural material for roofing and other construction applications in various types of buildings. The paper deals with both traditional methods of mineralogical-petrographic analysis as well as completely new methods (X-ray CT) rendering fast and reliable determination of qualitative parameters and potential slate durability in building constructions. A mutual combination of the methods represents a rapid, effective and modern alternative to lengthy laboratory tests to determine physical-mechanical properties of newly used roofing, especially in historical buildings.

Vibration-Based Structural Damage Identification Under Interval Uncertainty

2016 ◽  
Author(s):  
David Yoo ◽  
Jiong Tang
Keyword(s):  
Structural Damage ◽  
Prior Information ◽  
Random Distribution ◽  
Damage Identification ◽  
Interval Uncertainty ◽  
Damage Location ◽  
Physical Access ◽  
Non Destructive ◽  
Destructive Methods ◽  
Fuzzy Interval

Identifying damages in mechanical structures in advance is essential part of preventing catastrophic losses. Among several non-destructive methods, the vibration-based method, which utilizes global characteristics of the structures, has several advantages such as not requiring prior information on possible damage location and physical access to it. In the meantime, the mechanical structures are inevitably subject to uncertainties, whose distribution is often unknown in practical situations due to such as limited amount of available data. Uncertainties are treated as interval uncertainty in such cases. In this regard, this study presents vibration-based damage identification under interval uncertainty. To obtain reliable result, this research does not assume any random distribution, e.g., uniform distribution, inside interval. Since detected damage is not assumed to be monotonic function with respect to interval uncertainty either, traditional fuzzy interval arithmetic is not applicable. Instead, we first carry out exhaustive search to see the effect of the interval uncertainty on the identified damage; i.e., discretizing interval uncertainty into sub-intervals and executing damage identification under all possible combinations to see the effect of the interval uncertainty on the identified damage. We then develop the unique algorithm based on M-H algorithm to facility computational efficiency.

Sign in / Sign up

Export Citation Format

Share Document