After the yield point, ductile metals undergo a period of strain hardening, in which the stress increases again with increasing strain, and they begin to neck, as the cross-sectional area of the specimen decreases due to plastic flow.
22.
BTI can quantitatively evaluate multiple mechanical and structural properties of breast and breast lesions, such as Young s modulus, elasticity contrast, tissue nonlinearity ( strain hardening ), heterogeneity index, nodule size, shape and mobility, which could be altered by cancer development.
