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Indian Journal of Engineering and Materials Sciences (IJEMS) >
IJEMS Vol.16 [2009] >
IJEMS Vol.16(5) [October 2009] >
| Title: | Fracture analysis for a non-homogeneous weldment with a crack parallel to the interface |
| Authors: | Li, Yong-Dong
Zhang, Hong-Cai
Lee, Kang Yong |
| Keywords: | Weldment
Mismatch factor
Heat affected zone
Fracture
Functionally graded materials |
| Issue Date: | Oct-2009 |
| Publisher: | CSIR |
| Abstract: | Fracture modeling and analysis
are of significance in the design and evaluation of weldments. Based on a new
four-zone model, the present work performs anti-plane fracture analysis on a
non-homogeneous weldment consisting of four different kinds of zones: base
metal, heat affected zone (HAZ), fusion zone and weld metal. The HAZs and fusion
zones are modeled as functionally graded materials. A crack parallel to the
interface is assumed to be in the HAZ or weld metal. The crack problem is
solved by the methods of Fourier integral transform and dual integral equation.
Parametric studies on the stress intensity factors yield two conclusions for
the current fracture model of the four-zone weldment. (i) The optimal value of
the mismatch factor is 1.0. The increase in mismatch factor will decrease the
driving force of a HAZ crack, but it will enhance that of a weld-metal crack. In
engineering, mismatch factors too larger or too smaller than 1.0 should be
avoided. (ii) The effect of non-homogeneity parameter embodies that of the
relative stiffness of the crack-tip region. Stiffer crack-tip region may induce
larger driving force for the crack. |
| Page(s): | 295-300 |
| ISSN: | 0975-1017 (Online); 0971-4588 (Print) |
| Source: | IJEMS Vol.16(5) [October 2009]
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