tour 6 added

fig/double_cantilever_beam.png

fig/energy_dissipation.png

icons/perform.png

icons/takeaway.png

icons/wrapup.png

tour6_energy/6_1_energy_dissipation.ipynb

..._released_in_pullout_constant_bond_and_rigid_matrix.ipynb

tour6_energy/6_3_localized_energy_dissipation.ipynb

...ohesion plane with governed by a softening function.ipynb

...rgy/7_2_Softening_law_with_embedded_fracture_energy.ipynb

tour6_energy/7_3_Softening_law_and_damage_function.ipynb

...Mesh bias for discretized bar with linear softening.ipynb

...g law for stable calculation in finite element code.ipynb

...age function within a finite element implementation.ipynb

tour6_energy/9_1_Softening_law_and_damage_function.ipynb