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Fig. 3.
Stress relaxation tests for previously compressed granular specimens; various
underpressurevalues(0.05MPa,0.07MPaand0.09MPa)
The higher partial vacuum is generated inside a system, the more solid like
behaviorofthematerialisobserved.
Detailed informationrelatedto experimentaltests canbe found in previous
worksoftheauthors[3],[12]or[13].
3Modl
TheGubanovmodelhasbeenproposedinsixtiesofthelastcentury[11].Ithas
beeninitiallybuiltforpolymers.ItsmechanicalschemeisdepictedinFig.4.
Fig. 4.
MechanicalschemeoftheGubanovmodel
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