Basic Acoustic Emission signal treatment in the area of mechanical cyclic loading

Мазал, Павел; Pazdera, Lubos; Kolar, Lukas

doi:10.1504/ijmmp.2006.011649

Cited by 5 publications

(5 citation statements)

References 2 publications

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“…AE is getting more and more frequently used in industry for its unique ability to provide early warning signals of the occurrence of a failure. The development of a fatigue failure can be classifi ed into unexpected failures (Mazal, 2006;Mazal, 2011).…”

Section: Acoustic Emissionmentioning

confidence: 99%

Fatigue strength tests of layered steel

Černý¹,

Мазал²,

Filípek³

et al. 2013

Acta Univ. Agric. Silvic. Mendelianae Brun.

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AbstractČERNÝ MICHAL, MAZAL PAVEL, FILÍPEK JOSEF, DOSTÁL PETR: Fatigue strength tests of layered steel. Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis, 2013, LXI, No. 1, pp. 39-49 The work deals with original measurement of fatigue properties of formed layered steel materialdamask steel. This is a material that exhibits a fi ne micro-structure as well as a regular composition of many material layers with complementary properties. The article experimentally verifi es highcycle fatigue properties of layered steel and evaluates them from the point of view of fatigue tests of conventional steel materials and a parallel application of a non-destructive -acoustic emissiontesting. Finally, it discusses the infl uence of production on fatigue strength and the possibilities of using multi-layered steel materials in technological practice. A serious result of this pilot experiment is the fact documented no only by the fractographic observation, but mainly by the AE records that the fatigue service life of this material is high if it its not stressed by tension approximating the yield point R e . However, such stress is not common in practical use of tools made of damask steel and thus under common bending stress an exceptionally long service life of tools made of this type of material is demonstrable. The fact that damask steel behaves like a homogeneous material is mainly confi rmed by the records of the AE signal at lower values of stress  a. When stressed by higher amplitudes of tension  a damask responds in AE records similarly to a laminate material that is stressed by bending. damask steel, fatigue tests, crack propagation, non-destructive testing, acoustic emission Damask steelDamask steel is a material that exhibits a fi ne micro-structure as well as a regular composition of many material layers with complementary properties. In general, two types of a steel "semifi nished product" are used that are joined using the forge welding method, i.e. hot volume welding, and heat treated from the point of view of mechanical properties of the fi ne structure a er forming. The material is completely compact without visible traces of delamination even in case of a signifi cant degree of deformation as a consequence of general stress, i.e. when subjected to a static force.The fi nal cut that is led through the formed packet in a "suitable direction" and the microstructural composition participate on the damask steel "pattern" a er being chemically induced. Etching follows a er grinding and polishing. Depth etching (with the use of an acid solution that dissolves individual steel components at a diff erent rate) is manifested by the development of a three-dimensional relief that is characterized by the formation procedure of the layered material composition and the infl uence of the applied input materials.The production is based on the selection of suitable steel. With an increasing content of alloying elements steel loses conditional weldability. Therefore, carbon steel is used for the conventiona...

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Section: Acoustic Emissionmentioning

confidence: 99%

Fatigue strength tests of layered steel

Černý¹,

Мазал²,

Filípek³

et al. 2013

Acta Univ. Agric. Silvic. Mendelianae Brun.

Self Cite

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“…AE monitoring offers determination of location and propagation of a crack during loading as already reported by many researchers. Acquisition of AE signals during different production processes in different setups has become widely used because of high sensitivity and usefulness for online surveillance [2] to [4]. Cao et al [5] investigated AE signals during fourpoint bending fatigue crack propagation in steel.…”

Section: Introductionmentioning

confidence: 99%

Acoustic Emission Signal Analysis for the Integrity Evaluation

2018

SV-JME

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“…The major AE signal sources detected by NDT are crack growth and plastic deformation of the steel [4]. Acoustic emission (AE) as transient elastic waves has drawn a great deal of attention because of its applicability to online surveillance and capability to acquire data with high sensitivity [5][6][7]. Cao et al [8] investigated acoustic emission (AE) signals during four-point bending fatigue crack propagation in the base metal and weld of´16 Mn steel.…”

Section: Introductionmentioning

confidence: 99%

Wavelet Packet Decomposition to Characterize Injection Molding Tool Damage

2016

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This paper presents measurements of acoustic emission (AE) signals during the injection molding of polypropylene with new and damaged mold. The damaged injection mold has cracks induced by laser surface heat treatment. Standard test specimens were injection molded, commonly used for examining the shrinkage behavior of various thermoplastic materials. The measured AE burst signals during injection molding cycle are presented. For injection molding tool integrity prediction, different AE burst signals' descriptors are defined. To lower computational complexity and increase performance, the feature selection method was implemented to define a feature subset in an appropriate multidimensional space to characterize the integrity of the injection molding tool and the injection molding process steps. The feature subset was used for neural network pattern recognition of AE signals during the full time of the injection molding cycle. The results confirm that acoustic emission measurement during injection molding of polymer materials is a promising technique for characterizing the integrity of molds with respect to damage, even with resonant sensors.

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Basic Acoustic Emission signal treatment in the area of mechanical cyclic loading

Cited by 5 publications

References 2 publications

Fatigue strength tests of layered steel

Fatigue strength tests of layered steel

Acoustic Emission Signal Analysis for the Integrity Evaluation

Wavelet Packet Decomposition to Characterize Injection Molding Tool Damage

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