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Analysis of the 3d fracture characteristics of CT specimens in the elastic-plastic state

✍ Scribed by X.M Chen; C.Q Zheng; H.G Hahn

Publisher
Elsevier Science
Year
1992
Tongue
English
Weight
562 KB
Volume
42
Category
Article
ISSN
0013-7944

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✦ Synopsis

In this paper, the void growth ratio parameter Vg is applied to describe the 3D fracture characteristics of CT specimens in the elastic-plastic state by means of the finite. element method. The effects of stress triaxiality and plastic deformation on V8 are analysed in both the r, 9 plane and the thickness direction I. It is found that t+e maximum Vs always takes place in the midsection of the specimen in the thickness direction; there are two peak values of V,, around 9 = n/4 and 9 = R -n/4 in the r, 9 plane, where z equals a constant. This can explain the bluntness of a sharp crack. Generally speaking, the stress triaxiality parameter is the main factor deciding the magnitude of V,, but V, strongly depends on the equivalent plastic strain at larger plastic deformation.

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