With the rapid development of micro/nano manufacturing technology and nanomaterials,the accurate measurement of the mechanical properties and behaviors at the micro-nano scale represents a new field of mechanical expe...With the rapid development of micro/nano manufacturing technology and nanomaterials,the accurate measurement of the mechanical properties and behaviors at the micro-nano scale represents a new field of mechanical experiments.Raman spectroscopy,which is based on lattice dynamics theory,is applicable to the detection of the statistical information of the lattice structure deformation within the measuring points.Due to its peculiarities,such as non-destructiveness,convenience and high-resolution,this technology allows the on-line in situ measurement of residual stress in microstructures caused by processing and can also achieve the real-time deformation of graphene,carbon nanotubes and other nanomaterials under force loading.In recent years,mechanical measurements based on Raman spectroscopy technology have developed rapidly.In this review,Raman-based stress measurement theories for several commonly used materials are briefly described.Applications related to the residual stress measurements of microstructure and experimental investigations of the mechanical properties of low-dimensional nanomaterials are then reviewed.Finally,the development trend of this method is proposed.展开更多
In this paper,a new method combining focused ion beam(FIB)and scanning electron microscope(SEM)Moirétechnique for the measurement of residual stress at micro scale is proposed.The FIB is employed to introduce str...In this paper,a new method combining focused ion beam(FIB)and scanning electron microscope(SEM)Moirétechnique for the measurement of residual stress at micro scale is proposed.The FIB is employed to introduce stress relief like the macro ring-core method and fabricate gratings with a frequency of 5000 lines/mm on the measured area of the sample surface.Three groups of gratings in different radial directions are manufactured in order to form a micro-scale strain rosette.After milling ring-core by FIB,the deformation incurred by relief of the stress will be recorded with the strain rosette.The displacement/strain field can be measured using SEM scanning Moiréwith random phase-shifting algorithm.In this study,the Nickel alloy GH4169 sample(which was processed by laser shock peening)is selected as a study object to determine its residual stress.The results showed that the components of the in-plane principal stresses were-359 MPa and-207 MPa,respectively,which show good agreement with the results obtained from the available literature.展开更多
This paper investigates the effect of the location of testing area in residual stress measurement by Moiréinterferometry combined with hole-drilling method.The selection of the location of the testing area is ana...This paper investigates the effect of the location of testing area in residual stress measurement by Moiréinterferometry combined with hole-drilling method.The selection of the location of the testing area is analyzed from theory and experiment.In the theoretical study,the factors which affect the surface released radial strainεr were analyzed on the basis of the formulae of the hole-drilling method,and the relations between those factors andεr were established.By combining Moiréinterferometry with the hole-drilling method,the residual stress of interference-fit specimen was measured to verify the theoretical analysis.According to the analysis results,the testing area for minimizing the error of strain measurement is determined.Moreover,if the orientation of the maximum principal stress is known,the value of strain will be measured with higher precision by the Moiréinterferometry method.展开更多
The work described in this paper is part of the European Project IBIOLAB, trying to find suitable metalworking fluids based on vegetable oils, such us High Oleic Sunflower Oil （HOSO）. In this paper, the performance ...The work described in this paper is part of the European Project IBIOLAB, trying to find suitable metalworking fluids based on vegetable oils, such us High Oleic Sunflower Oil （HOSO）. In this paper, the performance of the newly developed IBIOLAB water based formulations supplied by SOGELUB and LUBRIX is analyzed and compared with reference Mineral and Synthetic cutting fluids Innovative characterization tests at laboratory scale （3 ball abrasion tests, grinding simulation tests, Tapping torque test） in real grinding machines in combination with advanced characterization techniques （residual stress measurements monitored by RX to predict formation of cracks）, have been used for screening the performance of the emulsions.展开更多
基金financially supported by the National Basic Research Program of China (2012CB937500)the National Natural Science Foundation of China (11227202,11372217 and 11272232)the Program for New Century Excellent Talents in University (NCET-13)
文摘With the rapid development of micro/nano manufacturing technology and nanomaterials,the accurate measurement of the mechanical properties and behaviors at the micro-nano scale represents a new field of mechanical experiments.Raman spectroscopy,which is based on lattice dynamics theory,is applicable to the detection of the statistical information of the lattice structure deformation within the measuring points.Due to its peculiarities,such as non-destructiveness,convenience and high-resolution,this technology allows the on-line in situ measurement of residual stress in microstructures caused by processing and can also achieve the real-time deformation of graphene,carbon nanotubes and other nanomaterials under force loading.In recent years,mechanical measurements based on Raman spectroscopy technology have developed rapidly.In this review,Raman-based stress measurement theories for several commonly used materials are briefly described.Applications related to the residual stress measurements of microstructure and experimental investigations of the mechanical properties of low-dimensional nanomaterials are then reviewed.Finally,the development trend of this method is proposed.
基金supported by the National Basic Research Program of China(Grant Nos.2010CB631005 and 2011CB606105)the National Natural Science Foundation of China(Grant Nos.90916010,11172151 and 11232008)+1 种基金Specialized Research Fund for the Doctoral Program of Higher Education(Grant No.20090002110048)Tsinghua University Initiative Scientific Research Program
文摘In this paper,a new method combining focused ion beam(FIB)and scanning electron microscope(SEM)Moirétechnique for the measurement of residual stress at micro scale is proposed.The FIB is employed to introduce stress relief like the macro ring-core method and fabricate gratings with a frequency of 5000 lines/mm on the measured area of the sample surface.Three groups of gratings in different radial directions are manufactured in order to form a micro-scale strain rosette.After milling ring-core by FIB,the deformation incurred by relief of the stress will be recorded with the strain rosette.The displacement/strain field can be measured using SEM scanning Moiréwith random phase-shifting algorithm.In this study,the Nickel alloy GH4169 sample(which was processed by laser shock peening)is selected as a study object to determine its residual stress.The results showed that the components of the in-plane principal stresses were-359 MPa and-207 MPa,respectively,which show good agreement with the results obtained from the available literature.
基金supported by the National Basic Research Program of China(Grant Nos.2010CB631005 and 2011CB606105)the National Natural Science Foundation of China(Grant Nos.11232008,91216301,11227801 and 11172151)Tsinghua University Initiative Scientific Research Program
文摘This paper investigates the effect of the location of testing area in residual stress measurement by Moiréinterferometry combined with hole-drilling method.The selection of the location of the testing area is analyzed from theory and experiment.In the theoretical study,the factors which affect the surface released radial strainεr were analyzed on the basis of the formulae of the hole-drilling method,and the relations between those factors andεr were established.By combining Moiréinterferometry with the hole-drilling method,the residual stress of interference-fit specimen was measured to verify the theoretical analysis.According to the analysis results,the testing area for minimizing the error of strain measurement is determined.Moreover,if the orientation of the maximum principal stress is known,the value of strain will be measured with higher precision by the Moiréinterferometry method.
文摘The work described in this paper is part of the European Project IBIOLAB, trying to find suitable metalworking fluids based on vegetable oils, such us High Oleic Sunflower Oil （HOSO）. In this paper, the performance of the newly developed IBIOLAB water based formulations supplied by SOGELUB and LUBRIX is analyzed and compared with reference Mineral and Synthetic cutting fluids Innovative characterization tests at laboratory scale （3 ball abrasion tests, grinding simulation tests, Tapping torque test） in real grinding machines in combination with advanced characterization techniques （residual stress measurements monitored by RX to predict formation of cracks）, have been used for screening the performance of the emulsions.
