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1 Zeszyty Naukowe. Mechanika / Politechnika Opolska

1 2005

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A novel factor to assess the lateral constraint under mode-I loading

Fernández-Zúňiga D., Castillo E., Fernández-Canteli A.

Zeszyty Naukowe. Mechanika / Politechnika Opolska

2005

z. 82

73-82

The stress intensity factors KIxx, KIyy and KIzz are introduced as an extension of the conventional stress intensity factor for mode-I of loading, KI. This enables us the definition of a lateral constraint index, y, as the ratio KIzz / K*Izz at the crack front, or, more generally, as sigmazz(pierwiastek (2(pi)r))/K*Izz outside the crack front, where K*Izz refers to plane strain conditions. The index y is determined numerically by means of three-diemensional finite element calculations. It facilitates the conversion between the stress intensity factor KI and the JI-integral in mode-I of loading for different specimens (CT, SENB, Arcan-Richard, etc.) of whichever thickness, thus opening new perspectives for the consideration of the influence of the lateral constraint by establishing instability conditions of cracks.