Civil Engineering Reference
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where k is a factor the form of which is
kk
V
,
k
.
m
0
2.6.2.5.
Pietruszczak
- Reference: [PIE 88].
- Principle: non-associated plasticity.
Figure 2.18.
Pietruszczak failure surface, (a) space of the main stresses;
(b) meridian plane; (c) deviatoric plane (from [PIE 88])
- Application field: low or medium confinement pressure, monotonous loading.
- Can model: the sensitivity of the material to confinement pressure, contraction-
dilatancy transition, brittle-ductile transition and strain hardening.
- Cannot model: compaction, unloading.
- Model data: failure surface.
2.6.2.6.
Sandler et al. (CAP)
- Reference [SAN 76].
- Principle: associated plasticity.
- Application field: behavior under impact, high pressures.
- Can model: compaction.
- Cannot model: damage.
- Model data: shear failure criterion and “cap” surface.
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