| 1 | Numerical analysis of three-dimensional thermo-elastic rolling contact under steady-state conditions显示文摘In this study,a three-dimensional thermo-elastic model that considers the interaction of mechanical and thermal deformation is developed using a semi-analytic method for steady-state rolling contact.Creepage types in all directions are considered in this model.For verification,the numerical analysis results of shear traction and temperature increase are compared separately with existing numerical results,and the consistency is confirmed.The analysis results include heat flux,temperature increase,contact pressure,and shear traction.Under severe rolling conditions,the thermal effect changes the behavior of the contact interface significantly.Furthermore,the effects of creepage,rolling speed,and conformity under different rolling and creep conditions are investigated. | Yonghun YU Junho SUH | 2022 | Friction2022，10，4： | 1 |
| 2 | Massively parallel electro-optic sampling of space-encoded optical pulses for ultrafast multi-dimensional imaging显示文摘High-speed and high-resolution imaging of surface profiles is critical for the investigation of various structures and mechanical dynamics of micro-and nano-scale devices.In particular,recent emergence of various nonlinear,transient and complex mechanical dynamics,such as anharmonic vibrations in mechanical resonators,has necessitated real-time surface deformation imaging with higher axial and lateral resolutions,speed,and dynamic range.However,real-time capturing of fast and complex mechanical dynamics has been challenging,and direct time-domain imaging of displacements and mechanical motions has been a missing element in studying full-field structural and dynamic behaviours.Here,by exploiting the electro-optic sampling with a frequency comb,we demonstrate a line-scan time-of-flight(TOF)camera that can simultaneously measure the TOF changes of more than 1000 spatial coordinates with hundreds megapixels/s pixel-rate and sub-nanometre axial resolution over several millimetres field-of-view.This unique combination of performances enables fast and precise imaging of both complex structures and dynamics in three-dimensional devices and mechanical resonators. | Yongjin Na Hyunsoo Kwak Changmin Ahn Seung Eon Lee Woojin Lee Chu-Shik Kang Jungchul Lee Junho Suh Hongki Yoo Jungwon Kim | 2023 | Light(Science & Applications)2023，12，2： | 1 |
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