The elastic component [J.sub.e] can be expressed via the stress intensity
factor K by
 dug deep into the damage mechanisms of cracks under seepage pressure and established a damage mechanics model of cracked rocks and the evolution equation of crack tip stress intensity
factor under both compression-shear stress field and the seepage field.
They were able to show that rubber modified epoxies undergo a transition in the FCP behaviour at a dynamic stress intensity
level where the plastic zone size of the crack tip exceeds the modifier's particlc size, and due to the activation of mechanisms such as cavitation and shear yielding of the matrix the resistance to FCP was improved.
The stress intensity
factors of a central crack in an orthotropic material under a uniform heat flow are given by Tsai .
The stress concentration at the very tip of the discontinuity or crack is described by the stress intensity
factor K--a term used in fracture mechanics.
Mean yield comparison under contrasting environments indicated substantial yield loss in the yield potential of some of the genotypes duly confirmed by the moderate value (0.13) of stress intensity
. Under drought-stressed conditions, accessions 31 (K-01116), 23 (K-01105), 28 (K-01111), 19 (K-01020), 5 (CM-1235/08) and 6 (CM-1238/08) had the greatest grain yield while genotypes 49 (K-01230), 51 (K-01240) and 32 (K-01203) exhibited lowest grain yield.
When the stress intensity
ratio is lower than a certain threshold, the rock strain - time curve is shown in curve 1.
In analyzing the SCR test data, the load parameter can be expressed by the stress intensity
factor K based on LEFM.
In the problem under consideration, of essential practical interest is the stress intensity
coefficient (SIC) for delamination edges at [phi] = -[alpha] - 0 and at [phi] = [alpha] + 0, i.e.
Parameters used for characterizing fracture behavior that are derived in the framework of fracture mechanics are: 1.) pre-exponent and exponent of the Paris curve that is used to describe fatigue crack growth rates; 2.) fracture toughness in the linear elastic and elastic-plastic fracture mechanics regimes based on the stress intensity
factor (K) and the energy parameter J-integral; and 3.) tearing modulus (T) defined as the slope of the J-resistance curve for ductile fracture.
The literature highlights the existence of some methods based on the Stress Intensity
Factor (KI) concept that permits evaluating with accuracy the fracture of the structures.