Measurement of displacement field around an interfacial crack in a bimaterial sheet

✍ Scribed by F.P. Chiang; Lu Hua

• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 741 KB
• Volume: 41
• Category: Article
• ISSN: 0013-7944
• DOI: 10.1016/0013-7944(92)90242-7

✦ Synopsis

Ahatraet-The displacement field around a bimaterial interfacial crack was investigated using a laser speckle technique. The two half-plates of the bimaterial specimen were made of two different polyester resins cast together with a central crack embedded during casting. The bimaterial constant of the plate was close to the value of aluminium-iron combination. The specimen was loaded in remote pure shear by a specially designed loading jig. In contrast to the predictions by many of the theoretical models, the present measurements revealed no crack closure at either crack tip. Furthermore, a comparison was made between the present measured values and the Rice and Sih's theoretical solution of displacement jumps across the crack face. The result showed that while tangential displacement jump was in very good agreement with the theoretical predictions, the opening displacement jump measured was much larger than that predicted by the theory.