“…We can point out that in the tests in which the loading remained under the rupture strength, the surface of the pebbles did not show cracks near the contact zone. Differently in the oedometric tests for correspondent values of the load, a lot of cracks were detected near the contact zone [6], probably caused by the radial constraints. Fig.…”
Section: Compression Tests On Single Sphere Of LI 2 Tio 3 and Li 4 Siomentioning
confidence: 83%
“…• for Li 2 TiO 3 : K MT = 331 N/mm • for Li 4 SiO 4 : K OS = 238 N/mm Transforming the load-displacement curve in strainstress curve with reference to the maximum axial crosssection, we found an effective modulus in the unloading phase: For a given material, the effective modulus of the spheres and that obtained in oedometric tests on pebble bed are almost equal [6].…”
Section: Compression Tests On Single Sphere Of LI 2 Tio 3 and Li 4 Siomentioning
confidence: 87%
“…This paper deals with the experimental activity performed at the Dipartimento di Ingegneria Meccanica Nucleare e della Produzione of the University of Pisa (Italy) in order to determine the effective properties of the pebble beds and to develop a constitutive model. Oedometric and uniaxial conductivity tests on pebble bed are illustrated elsewhere [5,6]. This paper reports the results of two mechanical characterization tests on lithium metatitanate (Li 2 TiO 3 ) and lithium orthosilicate (Li 4 SiO 4 ) spheres.…”
“…We can point out that in the tests in which the loading remained under the rupture strength, the surface of the pebbles did not show cracks near the contact zone. Differently in the oedometric tests for correspondent values of the load, a lot of cracks were detected near the contact zone [6], probably caused by the radial constraints. Fig.…”
Section: Compression Tests On Single Sphere Of LI 2 Tio 3 and Li 4 Siomentioning
confidence: 83%
“…• for Li 2 TiO 3 : K MT = 331 N/mm • for Li 4 SiO 4 : K OS = 238 N/mm Transforming the load-displacement curve in strainstress curve with reference to the maximum axial crosssection, we found an effective modulus in the unloading phase: For a given material, the effective modulus of the spheres and that obtained in oedometric tests on pebble bed are almost equal [6].…”
Section: Compression Tests On Single Sphere Of LI 2 Tio 3 and Li 4 Siomentioning
confidence: 87%
“…This paper deals with the experimental activity performed at the Dipartimento di Ingegneria Meccanica Nucleare e della Produzione of the University of Pisa (Italy) in order to determine the effective properties of the pebble beds and to develop a constitutive model. Oedometric and uniaxial conductivity tests on pebble bed are illustrated elsewhere [5,6]. This paper reports the results of two mechanical characterization tests on lithium metatitanate (Li 2 TiO 3 ) and lithium orthosilicate (Li 4 SiO 4 ) spheres.…”
“…The stress-strain curve of pebble beds, during a compression loading, depends on the plastic deformation in correspondence of the contact between pebbles [1]. Eq.…”
Section: Effective Properties Of LI 4 Sio 4 Pebble Bedsmentioning
confidence: 99%
“…http://dx.doi.org/10.1016/j.fusengdes.2013.04.026 on ceramic pebble beds (lithium ortosilicate and lithium metatitanate). In particular, the effective thermal conductivity of the beds, versus the temperature and the axial pressure, has been determined by means of an experimental set up purposely designed [1]. The experimental tests have been simulated with the FEM codes using a homogenous model for the pebble bed.…”
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