Merge remote-tracking branch 'origin/master'

environment.yml

extras/sparse_solver/dense_mtx.py

tour1_intro/1_3_elastic_stiffness_of_the_composite.ipynb

tour2_constant_bond/fragmentation.ipynb

tour3_nonlinear_bond/3_1_nonlinear_bond.ipynb

tour3_nonlinear_bond/3_2_anchorage_length.ipynb

tour4_plastic_bond/4_1_PO_multilinear_unloading.ipynb

tour4_plastic_bond/4_2_BS_EP_SH_I_A.ipynb

tour4_plastic_bond/4_3_PO_trc_cfrp_cyclic.ipynb

...d/5_1_Introspect_Damage_Evolution_Damage_initiation.ipynb

tour5_damage_bond/5_2_PO_cfrp_damage.ipynb

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