Analysis on Acoustic Emission Produced by Strength Test of Bio-Ceramics: Dependency of AE Parameters on the Material Property

2003 ◽  
Author(s):  
Mitusyuki Nakayama ◽  
Hideto Suzuki
Keyword(s):  
Acoustic Emission ◽  
Material Property ◽  
Mechanical Characteristics ◽  
The Body ◽  
Advanced Materials ◽  
Wave Form ◽  
Micro Structure ◽  
Emission Method ◽  
Ae Signal ◽  
Good Agreement

Recently, advanced material used as a bio-ceramic is developed. These materials have one of the important features that characteristics of biocompatibility are improved considerably. However, these advanced materials include some problems that the strength of bio-ceramics decreases in accordance with improvement of biocompatibility. In this paper, it is the main purpose to accurate the acoustic emission characteristics of bio-ceramics on the breaking test, which has never been discussed enough. Therefore, AE parameters are calculated with the wave form of AE signal emitted on the breaking test. Next, the relation between AE parameters and material property of bio-ceramics are discussed in order to accurate the effectiveness of micro-structure elements to mechanical characteristics. As a result, it is found that AE parameters have remarkable dependence on micro-structure element in the body of bio-ceramics. Consequently, it is clarified that the acoustic emission method gives good agreement with the mechanical characteristics.

Monitoring of the High-Technology Nailing of CFRTP Material under Ultrasonic Vibration by Acoustic Emission Method

2020 ◽  
Vol 1009 ◽  
pp. 25-30
Author(s):  
Yoshiaki Akematsu ◽  
Hiromitsu Gotho ◽  
Takayuki Tani ◽  
Hideaki Murayama ◽  
Tsuyoshi Matsuo ◽  
...  
Keyword(s):  
Acoustic Emission ◽  
Ultrasonic Vibration ◽  
Energy Parameter ◽  
High Technology ◽  
Acoustic Emission Method ◽  
Emission Method ◽  
Thermoplastic Material ◽  
Signal Characteristics ◽  
Ae Signal ◽  
Ae Signals

In this study, the potential to monitor the high-technology nailing of carbon fiber reinforced thermoplastic material (CFRTP) under ultrasonic vibration was investigated by acoustic emission (AE) method. AE signals were detected by a piezoelectric AE sensor during high-technology nailing under ultrasonic vibration. This paper describes some experimental results on AE signal characteristics and observation of the high-technology nailing. In order to investigate the effects of machining condition, we focused on RMS voltage, which is dependent on the energy parameter of the AE signal. It was found that the AE method is a useful method of monitoring high-technology nailing.

A Study of Acoustic Emission Produced by Strength Test on Bio-Ceramics: Dependency of AE Duration Time and Mean Frequency on the Material Property

2007 ◽  
Author(s):  
Mitsuyuki Nakayama
Keyword(s):  
Acoustic Emission ◽  
Phase Transformation ◽  
Young’S Modulus ◽  
Material Property ◽  
Mechanical Characteristics ◽  
Young's Modulus ◽  
Tetragonal Zirconia ◽  
Strength Test ◽  
Mean Frequency ◽  
Duration Time

Comparing the mechanical characteristics of bio-ceramics with a elaborate bone, there are two important conditions required for biomaterial. First, the strength must be three times larger than that of a elaborate bone. Second, Young’s modulus must be two or three times larger than that. However, still the biomaterial hasn’t developed which satisfies these conditions. The purpose of this research is to improve the strength of bio-ceramics. It was discussed how the duration time and mean frequency of acoustic emission (AE) parameters depend on time. These parameters are calculated with AE wave on breaking test of a bio-ceramics. The following main results were obtained. First, AE generating pattern is changed by the property of the materials. Second, in tetragonal zirconia polycrystals (TZP), the phase transformation has affected AE parameters. Consequently, it was shown that AE parameters had the material dependability.

scholarly journals The Possibility of Applying Acoustic Emission Method for Monitoring Lathing Process

2019 ◽  
Vol 26 (2) ◽  
pp. 21-27
Author(s):  
Krzysztof Dudzik
Keyword(s):  
Acoustic Emission ◽  
Cutting Speed ◽  
Acoustic Emission Method ◽  
Turning Process ◽  
Frequency Range ◽  
Emission Method ◽  
Machining Processes ◽  
Stable Conditions ◽  
Ae Signal

Abstract Nowadays acoustic emission (AE) method is used in many fields of science, including in the diagnosis and monitoring of machining processes such as turning, grinding, milling, etc. Monitoring of turning process allows ensuring stable conditions of treatment. Stable conditions of turning process have a great impact on the quality of the surface. This is especially important during finishing treatment. The research was carried out on a universal ZMM-SLIVEN CU500MRD lathe centre-using tool with removable insert SANDVIK Coromant WNMG 080408 – WMX Wiper. Lathing process was performed on the shaft of 74 mm in diameter made of S235 steel. The research was carried out at constant cutting speed v = 230 m/min. Changed parameters were feed f = 0.1; 0.2; 0.4 mm/rev and cutting depth ap = 0.5; 0.75; 1 mm. In the research was used a set of acoustic emission Vallen System. The kit includes: 4 channel signal recorder AMSY 6, two measurement modules ASIP-2/S, preamplifier with a frequency range 20 kHz – 1 MHz and the strengthening of 34dB and AE signal measurement sensor type VS 150M, with a frequency range 100 – 450 kHz. During the study, the acoustic emission (AE) generated during the lathing process were recorded parameters e.g. amplitude, number of events – hits, the effective value of the signal (RMS). The test results indicate, that the higher instability of the process was during turning with parameters: ap = 0.75 mm and f = 0.1 mm/rev. The study can be the basis for the use of acoustic emission method for monitoring lathing process to ensure stable conditions of that process and the same to obtain a high quality surface.

Highly localized acoustic emission monitoring of nanoscale indentation contacts

2003 ◽  
Vol 18 (4) ◽  
pp. 784-796 ◽  
Author(s):  
Natalia I. Tymiak ◽  
Antanas Daugela ◽  
Thomas J. Wyrobek ◽  
Oden L. Warren
Keyword(s):  
Acoustic Emission ◽  
Linear Relationship ◽  
Yield Point ◽  
Minimum Energy ◽  
Wave Form ◽  
Crystal Surfaces ◽  
Single Crystal Surfaces ◽  
Novel Approach ◽  
Wave Forms ◽  
Ae Signal

This study evaluated a novel approach for acoustic emission (AE) monitoring of nanoindentation. The technique utilizes a miniature AE sensor integrated into a calibrated diamond indenter tip on a commercial nanoindentation system. The evaluation focused on the yield -point phenomenon in W (100); MgO (100); and sapphire C (0001); R (1012); A (1210); and M (1010) single-crystal surfaces. The minimum amount of elastic energy release sufficient to produce AE signal detectable with the indenter tip sensor was nearly two orders of magnitude lower than the minimum energy level required for conventional AE sensors. Wave forms detected with the indenter tip sensor were independent of sample size. A linear relationship between released elastic energies and the corresponding AE energies was observed for all three evaluated materials. The scaling coefficient of the linear relationship was independent of indenter tip size/shape and indentation depth. The differences between the mechanisms of the initial stages of plasticity for the various crystallographic orientations of sapphire were reflected in the following aspects of AE activity: detection of a specific type of AE wave form that correlated to the presence of linear surface features near the indentation sites; AE signal associated with the yield point, consisting either of one or two distinct wave forms; and presence or absence of AE signals after the yield point. The possibility of plasticity onset in sapphire involving both slip and twinning is discussed.

Oscillator Strength Measurements in the Vacuum-Ultraviolet by the Emission Method

1988 ◽  
Vol 102 ◽  
pp. 353-356
Author(s):  
C. Goldbach ◽  
G. Nollez
Keyword(s):  
Oscillator Strength ◽  
Vacuum Ultraviolet ◽  
Oscillator Strengths ◽  
Emission Method ◽  
Absolute Scale ◽  
Good Agreement

AbstractThe principles and the realization of an experiment devoted to oscillator strength measurements in the vacuum-ultraviolet by the emission method are briefly presented. The results obtained for the strong multiplets of neutral nitrogen and carbon in the 1200-2000 Å range yield an absolute scale of oscillator strengths in good agreement with the most recent calculations.

Evaluating Micro-Structure, Hydration and Thermal Expansions of Cement Containing Nano-Silica

GIS Business ◽  
2020 ◽  
Vol 15 (1) ◽  
pp. 158-165 ◽  
Author(s):  
Dr. Sarvesh PS Rajput
Keyword(s):  
Portland Cement ◽  
Mechanical Characteristics ◽  
Microstructural Properties ◽  
Nano Silica ◽  
Micro Structure ◽  
Microstructural Characteristics ◽  
Mechanical And Microstructural Properties

This study reported that the addition of nano-silica enhances the mechanical characteristics of concrete as its compressive, flexural and tensile split strengths are increased. As a comparison mixture to equate it along with nano-modified concrete, ordinary samples of Portland cement (OPC) have been utilized. Herein, upto 6.0 percent of OPC has been substituted by nanosilica. In fact, the introduction of nanosilica improves mechanical and microstructural characteristics of concrete by significantly (28 to 35%). The finding therefore, indicated that partly replacing OPC with up to 5 percent nanosilica increases the mechanical and microstructural properties cured up to ninety days as opposed to the standard OPC mix.

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