Material made of a periodically repeating structure.
Constraint from which a material stops deforming in an elastic, reversible manner and thus begins to irreversibly deform.
The radial spoke is a multi-unit protein structure found in the axonemes of eukaryotic cilia and flagella.
Constant ratio between the deformation of a material and the utensil or compressive stress that causes this deformation.
Hierarchy is a way to organise a structure using different levels of authority and a vertical link, between superior and adjuvant levels of the organization. Higher levels control lower levels. You can think of an organizational hierarchy as a pyramid.