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Determining the plasticity of calcium hydrogen phosphate
Hořínková, Pavla ; Řehula, Milan (advisor) ; Špaček, Vladimír (referee)
The essential condition for a compaction of materials are their viscoelastic properties. There are many methods how to determine them. During a compaction process we can obtain elastic and plastic energies or energy of particle friction from a force-displacement record. After compaction the Young's modul of elasticity can be calculated from the tablet dilatation's values. The stress relaxation test is used for working out the plasticity of a compacted material. Using this test we get values of the methods FminA, FminB, Fpl and parameters of first order equation describing the pressure decrease during the stress relaxation. The viscoelastic properties of calcium hydrogenphosphate dihydrate were evaluated in this work by above mentioned methods except for energies. The results obtained by these methods were 288,080 MPa for the Young's modul of elasticity and 700,5167 MPa.s for the total plasticity Pc. The greater this value is, the better compaction properties the material has.
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Viscoelastic properties of calcium hydrogenphosphate dihydrate of Emcopress
Hořínková, Pavla ; Řehula, Milan (advisor) ; Špaček, Vladimír (referee)
The important condition for materials compression are their viscoelastic properties. Two methods are used in this work for determination viscoelastic parameters of calcium hydrogephosphate dihydrate - the Creep test and the Stress relaxation test. Both methods provide us with elastic and plastic constants. During the Creep test the compaction pressure is kept constant for 180s and a decrease of tablet height is measured. This tablet decreasing allows us to calculate viscoelastic parameters. The most important result is the factor of total plasticity FPC, which is equal to 0,89441. The greater this value is the better compaction properties the material has. A constant height of tablet is held for 180s in the Stress relaxation test and a decrease of pressure within the tablet is recorded. This pressure decrease is caused by three different processes. The third process is most important for the tablet plasticity and is expressed by the total parameter of third process PSR3C = 328,86916 MPas. Again, the greater this value is the better compaction properties the material has.
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Determining the plasticity of calcium hydrogen phosphate
Hořínková, Pavla ; Řehula, Milan (advisor) ; Špaček, Vladimír (referee)
The essential condition for a compaction of materials are their viscoelastic properties. There are many methods how to determine them. During a compaction process we can obtain elastic and plastic energies or energy of particle friction from a force-displacement record. After compaction the Young's modul of elasticity can be calculated from the tablet dilatation's values. The stress relaxation test is used for working out the plasticity of a compacted material. Using this test we get values of the methods FminA, FminB, Fpl and parameters of first order equation describing the pressure decrease during the stress relaxation. The viscoelastic properties of calcium hydrogenphosphate dihydrate were evaluated in this work by above mentioned methods except for energies. The results obtained by these methods were 288,080 MPa for the Young's modul of elasticity and 700,5167 MPa.s for the total plasticity Pc. The greater this value is, the better compaction properties the material has.
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Viscoelastic properties of calcium hydrogenphosphate dihydrate of Emcopress
Hořínková, Pavla ; Řehula, Milan (advisor) ; Špaček, Vladimír (referee)
The important condition for materials compression are their viscoelastic properties. Two methods are used in this work for determination viscoelastic parameters of calcium hydrogephosphate dihydrate - the Creep test and the Stress relaxation test. Both methods provide us with elastic and plastic constants. During the Creep test the compaction pressure is kept constant for 180s and a decrease of tablet height is measured. This tablet decreasing allows us to calculate viscoelastic parameters. The most important result is the factor of total plasticity FPC, which is equal to 0,89441. The greater this value is the better compaction properties the material has. A constant height of tablet is held for 180s in the Stress relaxation test and a decrease of pressure within the tablet is recorded. This pressure decrease is caused by three different processes. The third process is most important for the tablet plasticity and is expressed by the total parameter of third process PSR3C = 328,86916 MPas. Again, the greater this value is the better compaction properties the material has.
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