Iman E. Gharamti
Aalto University
Displacement (fluid)Work (thermodynamics)CrystalliteHomogeneity (statistics)CreepNonlinear systemComposite materialViscoelasticityMaterials scienceConstitutive equationRange (statistics)Fracture (geology)Phase (matter)ViscoplasticityMechanicsFracture mechanicsFracture toughness
3Publications
2H-index
1Citations
Publications 5
Newest
#1Iman E. Gharamti (Aalto University)H-Index: 2
#2John P. Dempsey (Clarkson University)H-Index: 23
Last. Jukka Tuhkuri (Aalto University)H-Index: 17
view all 4 authors...
Abstract null null This work investigates the influence of loading type, loading rate, and test size on the fracture energy of columnar freshwater S2 ice. The ice sheet in the Ice tank at Aalto University was very warm (above -0.5 null null null null null ∘ null null null C) and thick ( null null null 0.34 null null null h null null null 0.41 null null null null m). A program of nineteen mode I fracture tests using deeply cracked edge-cracked rectangular plates of various sizes (size range 1:39)...
Source
#1Iman E. Gharamti (Aalto University)H-Index: 2
#2John P. Dempsey (Clarkson University)H-Index: 23
Last. Jukka Tuhkuri (Aalto University)H-Index: 17
view all 4 authors...
Abstract. This work addresses the time-dependent response of 3 m×6 m floating edge-cracked rectangular plates of columnar freshwater S2 ice by conducting load control (LC) mode I fracture tests in the Aalto Ice Tank of Aalto University. The thickness of the ice plates was about 0.4 m and the temperature at the top surface about −0.3 ∘ C. The loading was applied in the direction normal to the columnar grains and consisted of creep/cyclic-recovery sequences followed by a monotonic ramp to fracture...
Source
#1Iman E. Gharamti (Aalto University)H-Index: 2
#2John P. Dempsey (Clarkson University)H-Index: 23
Last. Jukka Tuhkuri (Aalto University)H-Index: 17
view all 4 authors...
Abstract Large scale laboratory experiments on size and rate effects on the fracture of warm columnar freshwater ice have been conducted with floating edge-cracked rectangular plates loaded at the crack mouth. The largest test plate size had dimensions of 19.5m x 36m. The overall crack-parallel dimension covered a size range of 1 : 39 , possibly the largest for ice tested under laboratory conditions. The loading rates applied led to test durations from fewer than 2 seconds to more than 1000 seco...
Source
#1Iman E. Gharamti (Aalto University)H-Index: 2
#2John P. Dempsey (Clarkson University)H-Index: 23
Last. Jukka Tuhkuri (Aalto University)H-Index: 17
view all 4 authors...
Abstract. This work addresses the time-dependent response of 3 m × 6 m floating edge-cracked rectangular plates of columnar freshwater S2 ice by conducting load control (LC) mode I fracture tests at −2 °C in the Ice Tank of Aalto University. The loading profile consisted of creep/cyclic-recovery sequences followed by a monotonic ramp to fracture. The LC test results were compared with previous monotonically loaded displacement control (DC) experiments of the same ice, and the effect of creep and...
Source
#1Shen WangH-Index: 4
#2Iman E. Gharamti (Aalto University)H-Index: 2
Last. John P. Dempsey (Clarkson University)H-Index: 23
view all 3 authors...
Abstract An isolated cohesive crack loaded by a central concentrated load and a cohesive edge crack loaded by concentrated loading at the crack mouth are examined. In the cohesive zones of both cases, rectangular softening and linear softening are investigated. A distinct peak load does not occur for these negative geometries. The traction-free crack grows at the instant that the process zone is fully developed. In a negative geometry, in order to maintain traction-free crack propagation, the lo...
Source
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