Comparison of Young's Modulus Property Determination of Metallic Materials under Two Statistical Analysis Methods

2014 ◽  
Vol 894 ◽  
pp. 186-191
Author(s):  
Mohd Zaki Nuawi ◽  
Abdul Rahim Bahari ◽  
Shahrum Abdullah ◽  
Ahmad Kamal Ariffin
Keyword(s):  
Notch Filter ◽  
Medium Carbon Steel ◽  
Metallic Materials ◽  
Statistical Parameters ◽  
Aisi 304 ◽  
Medium Carbon ◽  
Impulsive Excitation ◽  
Statistical Signal Analysis ◽  
Steel Aisi

This paper presents an alternative statistical signal analysis method to characterise and determine Youngs modulus property of metallic materials. For this characterisation purpose, we propose an alternative method called Integrated Kurtosis-based Algorithm for Z-notch filter (I-kazTM) and Mesokurtosis Zonal Nonparametric (M-Z-N). Impulsive excitation test has been performed according to ASTM E1876 on three metallic materials of medium carbon steel S50C, stainless steel AISI 304 and brass to measure the piezoelectric and acoustic signals. The transient acoustic signal has been analysed using M-Z-N analysis while I-kazTM has been used to analyse the impulsive piezoelectric signal. Correlation expression between Youngs modulus property and the calculated statistical parameters has been discussed and the accuracy of these two methods has been identified using cast iron FCD 500 specimen.

Material Property Characterisation Method Using Vibro-Acoustic Signals

2014 ◽  
Vol 663 ◽  
pp. 447-452
Author(s):  
Mohd Zaki Nuawi ◽  
Abdul Rahim Bahari ◽  
Shahrum Abdullah ◽  
Ahmad Kamal Ariffin Mohd Ihsan ◽  
Fauziana Lamin
Keyword(s):  
Material Property ◽  
Notch Filter ◽  
Acoustic Signals ◽  
Medium Carbon Steel ◽  
Essential Requirement ◽  
Impulsive Excitation ◽  
Steel Aisi ◽  
Filtering Technique ◽  
Using Data

Material play an important role in engineering design and the characterisation of material property has become an essential requirement for their successful application as structural elements. In this paper, the development of material property characterisation method has been presented. Impulsive excitation test has been performed on rectangular bars (medium carbon steel S50C, cast iron FCD 500, stainless steel AISI 304and brass). The transient vibro-acoustic signals generated during the excitation test have been captured using data acquisition system consist of accelerometer-microphone combination. A new method for reducing the noise components from the recorded signals is introduced by an extensive process of a new Z-stem filtering technique. The filtered signals have been analysed using an alternative statistical method known as Integrated Kurtosis-based Algorithm for Z-notch filter (I-kazTM) to determine the pattern of the signal and to estimate the significance differences among those materials. The representation of the experimental curves obtained by the determination of I-kaz coefficient, Z∞ for various impact forces and materials revealed that the results are statistically significant and can be successfully used for determining the correlation between the curves and material property. Implications of this research to material property characterisation will be discussed.

METALLIC MATERIAL CHARACTERIZATION USING ACOUSTICS SIGNAL ANALYSIS

2016 ◽  
Vol 78 (6-10) ◽  
Author(s):  
Mohd Sani Ahmad ◽  
Mohd Zaki Nuawi ◽  
Alias Othman ◽  
Muhamad Arif Fadli Ahmad
Keyword(s):  
Material Properties ◽  
Impact Force ◽  
Notch Filter ◽  
Medium Carbon Steel ◽  
Observation Data ◽  
Metallic Materials ◽  
Destructive Testing ◽  
Metallic Material ◽  
Steel Aisi ◽  
Data Signal

Characterization of material properties is a vital aspect in engineering structural design as it practically use as a mechanical component. Nonetheless with such application, the component is highly vulnerable to failed under active loading condition. To prevent such failure, a reliable test to characterize the in-service structural component and its material properties is highly sought by manufacturing industries. This study is based on non-destructive testing by implementing the acoustics signals to describe the relationship of metallic material properties. Experimental procedure accordance to ASTM 1876 standards was carried out by using an impact hammer within specific range of impact force and acted to the specimens. Four types of materials were used in the study, such as medium carbon steel S50C, stainless steel AISI 304, cast iron FCD 500, and brass. The measurement process involves two types of observation data signal which were acoustic signal and impact force. Subsequently, microphone and an impact hammer were used for data acquisition signals. Acoustic signals are then filtered and analyzed using two methods, namely Integrated Kurtosis based Algorithm for Z-notch filter (I-kazTM) and Mesokurtosis Zonal Nonparametric (M-Z-N). The experimental curves obtained by the determination of I-kazTM coefficient and M-Z-N coefficient for various impact forces and metallic materials found that the results were statistically significant and can be successfully used for determining the correlation between the characteristic of the curves and the relevant elastic properties of the metallic materials. Apparently, experimental test of this analysis method on four metallic materials showed a good agreement between the quadratic coefficients with the metallic materials properties.

Paper 24: Dry Wear of Steel as Revealed by Electron Microscopy and X-Ray Diffraction

1967 ◽  
Vol 182 (14) ◽  
pp. 201-213
Author(s):  
T. F. J. Quinn
Keyword(s):  
Electron Microscopy ◽  
Medium Carbon Steel ◽  
X Ray Diffraction ◽  
Medium Carbon ◽  
X Ray ◽  
Ambient Temperatures ◽  
Transmission Electron ◽  
Steel Aisi ◽  
Diffraction Patterns ◽  
Fatigue Failures

Low-alloy, medium-carbon steel (AISI 4340) pins have been worn against discs of the same material at various loads under unlubricated (‘dry’) sliding conditions. Shadowed carbon replicas have been obtained from the surfaces of selected pins and discs. Transmission electron microscopy of these replicas revealed several interesting features, the most interesting being the presence of reproducible crack systems occurring in those parts of the surface at which the wear is taking place. These cracks are very similar to those obtained in fatigue failures. X-ray diffraction patterns were also obtained from these specimens, and from the corresponding wear debris. These indicated that oxidation had occurred at temperatures considerably in excess of the measured ambient temperatures. The various topographic and crystallographic features revealed by the electron microscopy and X-ray diffraction techniques are discussed in relation to a possible mechanism of ‘dry’ wear

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