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In the Elastic region of the graph, the strain is taken
by bending of unaligned struts. This strain is recoverable.
In the Plateau region, the strain is taken by the buckling
of the unaligned struts, causing unrecoverable plastic deformation at
a constant stress.
In the Densification region, the struts aligned with the
applied stress finally meet and can take the load, causing the change
of the stress strain behaviour towards that of pure aluminium.