Browsing by Author "LIN, GC"

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ACOUSTIC-EMISSION CHARACTERISTICS OF MORTAR UNDER COMPRESSION
(1992-07-01)
WENG, CC
;
TAM, MT
;
LIN, GC
;
交大名義發表
;
土木工程學系
This research is devoted to the study of the characteristics of acoustic emission (AE) signals of mortar under uniaxial compression. A total of 40 specimens were tested, in which the water-cement ratio, age, compressive strength and strain were the major parameters of mortar related to the AE signals. In addition, different compressive modes were used in the tests in order to investigate the AE Kaiser effect in mortar. From the test results, good correlation between the AE signals and the major parameters of mortar was observed. The experimental findings may provide useful information for further understanding of the AE characteristics of concrete and reinforced concrete.
ACOUSTIC-EMISSION CHARACTERIZATION OF A MEDIUM STRENGTH STEEL DURING HYDROGEN PERMEATION PROCESSES
(1992-06-01)
WENG, CC
;
LIN, GC
;
CHEN, RT
;
交大名義發表
;
土木工程學系
The characteristics of acoustic emission (AE) signals detected from the hydrogen permeation test of a medium strength steel were investigated. The aims of this research are to study the correlation between the AE signals and the severity of hydrogen-induced damages, and to investigate the relationship between the AE signals and the variation in hydrogen permeation current. In this study, an electrochemical approach using Devanathan's dual-cell method was adopted for the hydrogen permeation test. A total of five specimens were tested with a charging current varying from 10 to 60 mA. From the test results, good correlation was observed between the detected AE signals and the severity of the hydrogen-induced blistering and cracking. Also, it was found that the variation in the hydrogen permeation current showed a close correlation with the detected AE energy and events.