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Understand anisotropy dependence of damage evolution and material removal during nanoscratch of MgF_(2) single crystals

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International Journal of Extreme Manufacturing 2023年第1期5卷 236-252页

作者： Chen Li Yinchuan Piao Feihu Zhang Yong Zhang Yuxiu Hu Yongfei Wang State Key Laboratory of Robotics and System(HIT) Harbin Institute of TechnologyHarbin 150001People’s Republic of China

To understand the anisotropy dependence of the damage evolution and material removal during the machining process of MgF_(2) single crystals,nanoscratch tests of MgF_(2) single crystals with different crystal planes and directions were systematically performed,and surface morphologies of the scratched grooves under different conditions were *** experimental results indicated that anisotropy considerably affected the damage evolution in the machining process of MgF_(2) single crystals.A stress field model induced by the scratch was developed by considering the anisotropy,which indicated that during the loading process,median cracks induced by the tensile stress initiated and propagated at the front of the *** cracks induced by tensile stress initiated and propagated on the subsurface during the unloading *** addition,surface radial cracks induced by the tensile stress were easily generated during the unloading *** stress change led to the deflection of the propagation direction of lateral ***,the lateral cracks propagated to the workpiece surface,resulting in brittle removal in the form of chunk *** plastic deformation parameter indicated that the more the slip systems were activated,the more easily the plastic deformation *** cleavage fracture parameter indicated that the cracks propagated along the activated cleavage planes,and the brittle chunk removal was owing to the subsurface cleavage cracks propagating to the crystal *** the same processing parameters,the scratch of the(001)crystal plane along the[100]crystal-orientation was found to be the most conducive to achieving plastic machining of MgF_(2) single *** theoretical results agreed well with the experimental results,which will not only enhance the understanding of the anisotropy dependence of the damage evolution and removal process during the machining of MgF_(2) crystals,but also provide a theoretical foundation for achiev

关键词： anisotropy dependence damage evolution stress field crack propagation nanoscratch MgF_(2)single crystal

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Tensile mechanical analysis of anisotropy and velocity dependence of the spinal cord white matter:a biomechanical study

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Neural Regeneration Research 2021年第12期16卷 2557-2562页

作者： Norihiro Nishida Itsuo Sakuramoto Yoshihiro Fujii Rudolf Yoga Hutama Fei Jiang Junji Ohgi Yasuaki Imajo Hidenori Suzuki Masahiro Funaba Xian Chen Takashi Sakai Department of Orthopedic Surgery Yamaguchi University Graduate School of MedicineMinami-KogushiUbeYamaguchiJapan Department of Mechanical and Electrical Engineering National Institute of Technology Tokuyama CollegeGakuendaiShunanYamaguchiJapan Faculty of Engineering Yamaguchi UniversityTokiwadai UbeYamaguchiJapan

In spinal cord injuries,external forces from various directions occur at various ***,it is important to physically evaluate whether the spinal cord is susceptible to damage and an increase in internal stress for external *** hypothesized that the spinal cord has mechanical features that vary under stress depending on the direction and velocity of ***,it is difficult to perform experiment because the spinal cord is very *** are no reports on the effects of multiple external *** this study,we used bovine spinal cord white matter to test and analyze the anisotropy and velocity dependence of the spinal ***-vertical,tensile-parallel,shear-vertical,and shear-parallel tests were performed on the white matter in the fibrous direction(cranial to caudal).Strain rate in the experiment was 0.1,1,10,and 100/*** calculated the Young’s modulus of the spinal *** of the tensile and shear tests revealed that stress tended to increase when external forces were applied parallel to the direction of axon fibers,such as in tensile-vertical and shear-vertical ***,external forces those tear against the fibrous direction and vertically,such as in tensile-parallel and shear-parallel tests,were less likely to increase stress even with increased *** found that the spinal cord was prone to external forces,especially in the direction of the fibers,and to be under increased stress levels when the velocity of external forces *** these results,we confirmed that the spinal cord has velocity dependence and *** Institutional Animal Care and Use Committee of Yamaguchi University waived the requirement for ethical approval.

关键词： anisotropy dependence external force mechanistic analysis spinal cord injury straining rate stress velocity dependence white matter

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