Published July 1994 | Version v1
Journal article Metadata-only

Detection and characterization of fatigue cracks in steels by means of acoustic microscopy

Creators

  • 1. Inst. fuer Werkstoffwissenschaft, Technische Univ. Dresden (Germany)
  • 2. BAM, Berlin (Germany)

Description

Acoustic microscopy can be applied in order to visualize small cracks on a smooth surface. In the important field of fatigue behavior of materials, howery the detection of cracks on essentially rough surfaces is required. The effect of surface roughness on the detectability of fatigue cracks in deep drawing steels by means of acoustic microscopy is systematicaly investigated. There are interrelations between minimum detectable crack size, optimum frequency, defocus and surface roughness, in good agreement with the proposed mechanism of contrast formation. Beyond the pure detection of cracks they are characterized on the basis of the acoustic images. (orig.)

Abstract (German)

Ultraschallmikroskopie ist ein geeignetes Verfahren zur Abbildung kleinster Risse an glatten Oberflaechen. Besonders problematisch, aber um so bedeutender fuer die Werkstoffermuedung, ist die Detektion von Rissen an essentiell rauhen Oberflaechen. Die Detektierbarkeit von Ermuedungsrissen in Tiefziehstaehlen haengt wesentlich von der Rauheit, der Rissbreite, der Einschallfrequenz und der Defokussierung ab. Ueber die blosse Detektion hinausgehend werden die Ermuedungsrisse auf der Basis der akustischen Aufnahmen charakterisiert. (orig.)

Additional details

Additional titles

Original title (German)
Ultraschallmikroskopie: Detektieren und Charakterisieren von Ermuedungsrissen in Staehlen

Publishing Information

Journal Title
Materialpruefung
Journal Volume
36
Journal Issue
7-8
Journal Page Range
p. 306-309.
ISSN
0025-5300
CODEN
MTPRAJ

INIS

Country of Publication
Germany
Country of Input or Organization
Germany
INIS RN
25073803
Subject category
S42: ENGINEERING;
Descriptors DEI
ACOUSTIC MICROSCOPY; CRACKS; FATIGUE; NONDESTRUCTIVE TESTING; ROUGHNESS; STEELS; ULTRASONIC WAVES
Descriptors DEC
ALLOYS; CARBON ADDITIONS; IRON ALLOYS; IRON BASE ALLOYS; MATERIALS TESTING; MECHANICAL PROPERTIES; MICROSCOPY; SOUND WAVES; SURFACE PROPERTIES; TESTING