Rasmus ÿstergaard forside 100%.indd - Solid Mechanics

450 R. C. ØSTERGAARD ET AL.
The mode mixity is defined as
¼ tan 1 =ðKli Þ
30 and a=h > 1 ensures that the stress effects from the crack do
not reach the ends [11]. For the material combinations used here
ðL aÞ=H > 10 and a=h > 1 are sufficient.
Reduced Problem
From static equilibrium it is realized that two of the six loads Pn, Mn,
n ¼ 1 ...3 are statically determined and only four loads characterize the
loading.
Since, only the stress components, 12 and 22, are singular near the crack
tip, the singularity is not altered if superimposing stresses in the x 1-direction.