For Spirits when they please Can either Sex assume, or both; so soft And uncompounded is their Essence pure, Not ti'd or manacl'd with joynt or limb, Nor founded on the brittle strength
of bones, Like cumbrous flesh; but in what shape they choose Dilated or condens't, bright or obscure, Can execute their aerie purposes, And works of love or enmity fulfill.
The strength models were based on the calculation of two mechanisms of deformation (Ranalli, 1995; Turcotte and Schubert, 2002): a) linear increase of the brittle strength
with depth by frictional sliding , and b) exponential decay of the viscous strength with depth according to dislocation creep :
The probability density function of the brittle strength
of sub-volumes of the material body containing a single elementary flaw (here referred to as elementary units) is denoted by f([sigma]), and the cumulative frequency curve by
Kulagina returned as a Wili with nearly boneless backbends and an eerily brittle strength
In other words, at low temperatures the yield strength is higher than the brittle strength
, so failure is in the brittle mode.