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Application of the weight function and boundary collocation method to the calculation of initial phase transformation zones

✍ Scribed by T. Fett

Publisher: Elsevier Science
Year: 1995
Tongue: English
Weight: 560 KB
Volume: 52
Category: Article
ISSN: 0013-7944
DOI: 10.1016/0013-7944(95)00046-x

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✦ Synopsis

Transformation-toughened ceramics exhibit stress-induced phase transformation with the tetragonal phase changing to the monoclinic phase. These transformations will affect the stress field in the surroundings of crack tips. A special procedure---based on the fracture mechanics weight function--is used to compute the stress field at the onset of stable crack propagation. Calculations are performed for the special case of small-scale transformation zones as well as for zones around finite cracks in a finite body. It can be shown that the real stress field deviates from that computed on the base of the applied stress intensity factor. An interesting result which can be shown is that the crack opens due to the phase transformation zone, although the stress intensity factor is zero.

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