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The Study on the Measure of Void Content in Composite Materials and Its Implement

Author: SongLiJun
Tutor: ZhouXiaoJun；XuZhiNong
School: Zhejiang University
Course: Mechanical Manufacturing and Automation
Keywords: Composites Porosity Ultrasonic attenuation Data acquisition Data processing Histogram
CLC: TB33
Type: Master's thesis
Year: 2005
Downloads: 673
Quote: 8
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Abstract


This paper combines the model works inside and outside the elevon panel porosity nondestructive testing technology research projects, analysis of composite porosity detection methods and the development of a portable ultrasonic testing system. First porosity calculated torn down, and then through the analysis of the experimental data obtained correlation coefficient in the formula, the final combination of system implementations focus in-depth discussion of the system's data acquisition and processing technology and research. The main research contents are as follows: the first chapter. Through the analysis of the research background, composite materials and non-destructive testing techniques, analysis and destructive testing of composite technology status and outlook, and then focuses on the the composite porosity detection technology as well as the detection system in the data acquisition Finally, and processing technology, the main research content and organizational structure. Chapter II of the composite porosity detection Research introduced, based on several predecessors porosity detection methods, focusing on the idea of ??a pending formula coefficient method and formula pulled down, through various detection methods and feasibility analysis and comparison, the final pending formula coefficient calculated as the porosity of the system. The third chapter describes the formation of reason and calculation method of ultrasonic attenuation, pulse reflection method and pulse transmission technique works, the introduction of ultrasonic attenuation coefficient in the reflection method and penetration method formula, and the formula The correlation coefficients were measured, and then produced a plurality of standard test blocks, and their porosity measured by microscopic xerography, Finally, the use of the experimental data obtained on the calculation formula of the porosity in the Pending formula coefficient method for calibration. Chapter IV describes the working principle of the detection and classification method of ultrasonic, ultrasonic detection, and then determined on the basis of the design of a portable ultrasonic testing system and the composition of the system, the last data acquisition system and the realization of the transfer function of technology in-depth research and discussion. Fifth chapter analyzes need to be stored and processed for real-time sampling data, and then focus on the establishment of a real-time sampling data file, ultrasound time-domain waveform signal processing, porosity histogram analysis and testing of new materials porosity key issues, and the development of a software module, enabling the calculation and analysis of the data processing system, and the porosity. Chapter Summary and Outlook. First, review and summarize the work of the full text of some preliminary ideas, and then on the next phase of work.

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CLC: > Industrial Technology > General industrial technology > Materials science and engineering > Composite materials
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