摘要:

Structural effects of wet and dry grinding on AISI 4340 steel have been examined by X-ray diffraction analyses, metallographic observations and microhardness measurements and these are compared with measurements of magnetic Barkhausen noise amplitudes

ISSN:1058-9759    

DOI:10.1080/10589759308952800

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor

摘要:

This paper describes experiments in which acoustic emission ( AE) was monitored in samples of hydrided Zr-2.5 wt% Nb alloy tubes under applied diametric load. These hydrides form brittle platelets in the body of the alloy. The results are compared to those from samples of unhydrided Zr-Nb alloy tubes. It is shown that it is possible to discriminate between the AE originating from the hydride platelets and that from the metal alloy, as they appear to have distinct characteristics.

ISSN:1058-9759    

DOI:10.1080/10589759308952801

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor

摘要:

Magnetic Barkhausen noise ( MBN) measurements were made on a sample of pipeline steel to study the effect of magnetic flux density on the tensile stress dependence of MBN. The results suggest that MBN activity generally increases with flux density but begins to decrease slightly at higher flux densities. Similar behaviour is found at all tensile stress levels both when the stress is parallel and perpendicular to the applied field. The stress dependence of the MBN also shows a strong dependence on the flux density. However, at high flux density when the magnetic field is perpendicular to the stress, the MBN rms voltage saturates with increasing stress. These results are explained in terms of domain wall dynamics by considering the effect of the relative orientations of the magnetic flux density and applied tensile stress with respect to the easy axis of magnetization of the sample.

ISSN:1058-9759    

DOI:10.1080/10589759308952802

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor

摘要:

An investigation into the nondestructive monitoring of the environmental degradation of composite adhesive joints is presented. Three classes of joints, representing a variety of interfacial properties due to different pretreatments, were exposed to circulating hot water. Periodically thereafter specimens were weighed, subjected to an ultrasonic A-scan, and destructively tested to assess the breaking-loads and modes of failure. Statistical feature based analysis was conducted to correlate ultrasonic features to the amount of water soaked by the joints and the corresponding changes in their initial breaking-loads. The sensitivity of the ultrasonic features to the quality of the pretreatment provided to the joints was statistically tested as well.

ISSN:1058-9759    

DOI:10.1080/10589759308952803

出版商:Taylor & Francis Group    

年代:1993

数据来源: Taylor