Anderson's theory of Faulting explains some of the faults found in nature but fails to find all types of fault and fault system.

Parabolic failure envelope again as it gets into negative stresses.

At high stresses( opposite of tensile stresses) plastic deformation occurs at high normal stress, shear stress would be independent here. if the differential stress is known you can start to form a composite failure envelope in which the 5 fault types occur at different differential stresses

The stresses build up around the discontinuity or hole and that can be concentrated on the edges is the shape has a an elliptical shape. The more elongated the crack to more stress is concentrated at the edges of crack. The total stress was the same but because of the discontinuity the bonds at the edges of the crack saw too much stress and with this the geologic stresses of 100 see total stresses of 1000 in those sports which would mean the paradox we had is essentially solved. stresses at the tips of cracks will continually keep multiply and continue cracking until... no more airplane wings. The concentration is caused by the loss of the stress the crack or hole could have handled if were whole. Nature keeps propagating the cracks so while t the hole may keep getting bigger the force the stresses likely will not get more intense.

Wednesday we will se how this works with compression