摘要:

This paper presents a novel microcomputer-controlled multifrequency eddy current tester permitting the optimal frequency combination to be automatically determined for a given testing application. Measuring signals are digitized at the earliest possible time which is an essential criterion for flexible evaluation algorithms.

ISSN:0278-0895    

DOI:10.1080/10589758708952935

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

Surface cracks on sintered SiCMOR bars are ultrasonically measured by a dB drop technique, using surface acoustic waves. These values of crack size are compared with those obtained by applying linear elastic fracture mechanics to destructive measurements of bar strength. The magnitudes of two error components in the ultrasonic measurement are evaluated: a random component, due primarily to the finite beam width, and a consistent error component, due to closure effects at the crack tip.

ISSN:0278-0895    

DOI:10.1080/10589758708952936

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

摘要:

AE wave emitted from nucleating of microcracks or breaking of inclusions was detected by six transducers mounted on the specimen, then amplified and digitized by a highly efficient wave memory. And three dimensional location was carried out on various materials, that is, 3 types of Ti alloys, A533B steel, A470 steel. The difference in the tendency of microcrackings formation in different fracture mode or microstructure was confirmed.

ISSN:0278-0895    

DOI:10.1080/10589758708952937

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor

ISSN:0278-0895    

DOI:10.1080/10589758708952938

出版商:Taylor & Francis Group    

年代:1987

数据来源: Taylor