The splitting test is a competitive alternative method to study the tensile strength of sea ice owing to its suitability for sampling.However,the approach was questioned to the neglect of local plastic deformation dur...The splitting test is a competitive alternative method to study the tensile strength of sea ice owing to its suitability for sampling.However,the approach was questioned to the neglect of local plastic deformation during the tests.In this study,splitting tests were performed on sea ice,with 32 samples subjected to the regular procedure and 8 samples subjected to the digital image correlation method.The salinity,density,and temperature were measured to determine the total porosity.With the advantage of the digital image correlation method,the full-field deformation of the ice samples could be determined.In the loading direction,the samples mainly deformed at the ice-platen contact area.In the direction vertical to the loading,deformation appears along the central line where the splitting crack occurs.Based on the distribution of the sample deformation,a modified solution was derived to calculate the tensile strength with the maximum load.Based on the modified solution,the tensile strength was further calculated together with the splitting test results.The results show that the tensile strength has a negative correlation with the total porosity,which agrees with previous studies based on uniaxial tension tests.展开更多
Diffusion of Ag in nanometer Ni-B amorphous alloy,has been studied by heavy-ion Rutherford backscattering spectroscopy.The values of the diffusion coefficient which were found at 293,323 and 373K,are 3.5×10^(-16)...Diffusion of Ag in nanometer Ni-B amorphous alloy,has been studied by heavy-ion Rutherford backscattering spectroscopy.The values of the diffusion coefficient which were found at 293,323 and 373K,are 3.5×10^(-16),4.3 ×10^(-15) and 5.0×10^(-14) cm^(2)/s,respectively.Moreover,small values for the activation energy,0.58 eV,and the pre-exponential factor of the diffusion coefficient,3.9×10^(-16) cm^(2)/s,were derived from Arrhenius plot.Finally,a possible free volume controlled diffusion mechanism was discussed.展开更多
基金This study was supported financially by the National Key Research and Development Program of China(Grant no.2018YFA0605902)the National Natural Science Foundation of China(Grant no.52101300)+1 种基金the Fundamental Research Funds for the Central Universities(Grant no.DUT21LK03)Joint Scientific Research Fund Project of DBJI(Grant no.ICR2102).
文摘The splitting test is a competitive alternative method to study the tensile strength of sea ice owing to its suitability for sampling.However,the approach was questioned to the neglect of local plastic deformation during the tests.In this study,splitting tests were performed on sea ice,with 32 samples subjected to the regular procedure and 8 samples subjected to the digital image correlation method.The salinity,density,and temperature were measured to determine the total porosity.With the advantage of the digital image correlation method,the full-field deformation of the ice samples could be determined.In the loading direction,the samples mainly deformed at the ice-platen contact area.In the direction vertical to the loading,deformation appears along the central line where the splitting crack occurs.Based on the distribution of the sample deformation,a modified solution was derived to calculate the tensile strength with the maximum load.Based on the modified solution,the tensile strength was further calculated together with the splitting test results.The results show that the tensile strength has a negative correlation with the total porosity,which agrees with previous studies based on uniaxial tension tests.
文摘Diffusion of Ag in nanometer Ni-B amorphous alloy,has been studied by heavy-ion Rutherford backscattering spectroscopy.The values of the diffusion coefficient which were found at 293,323 and 373K,are 3.5×10^(-16),4.3 ×10^(-15) and 5.0×10^(-14) cm^(2)/s,respectively.Moreover,small values for the activation energy,0.58 eV,and the pre-exponential factor of the diffusion coefficient,3.9×10^(-16) cm^(2)/s,were derived from Arrhenius plot.Finally,a possible free volume controlled diffusion mechanism was discussed.
