A Finite Element Program (FECGS): Post-Processor FEPOST - GKSS
A Finite Element Program (FECGS): Post-Processor FEPOST - GKSS
A Finite Element Program (FECGS): Post-Processor FEPOST - GKSS
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Chapter 5<br />
QUANTITY DEFINITIONS<br />
5.1 The T -stress<br />
The definition of the T -stress can be written:<br />
T = σ spec<br />
xx − KI<br />
√ 2πr fxx(θ). (5.1)<br />
where σ spec<br />
xx is the x-direction normal stress in a near crack tip region of an actual specimen and<br />
loading. The second term on the right hand side of Eq. (5.1) is the first singular stress term in<br />
the Williams eigen-expansion.<br />
In <strong>FEPOST</strong>, the T -stress is calculated as follows:<br />
T = 1<br />
i=n �<br />
T<br />
n<br />
i =<br />
i=1<br />
i=n �<br />
i=1<br />
Alternatively, T i can also be obtained by,<br />
�<br />
iσspec xx (r i , θ = π) − KI<br />
√<br />
2πri fxx(θ i �<br />
) . (5.2)<br />
T i = [ i σ spec<br />
xx − i σ spec<br />
yy ] − KI<br />
√ 2πr i [fxx(θ i ) − fyy(θ i )] (5.3)
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