烧结钕铁硼的层裂强度及断裂机理

万印 王焕然 初广香 任春影

万印, 王焕然, 初广香, 任春影. 烧结钕铁硼的层裂强度及断裂机理[J]. 高压物理学报, 2019, 33(5): 054201. doi: 10.11858/gywlxb.20190746
引用本文: 万印, 王焕然, 初广香, 任春影. 烧结钕铁硼的层裂强度及断裂机理[J]. 高压物理学报, 2019, 33(5): 054201. doi: 10.11858/gywlxb.20190746
WAN Yin, WANG Huanran, CHU Guangxiang, REN Chunying. Spall Strength and Fracture Mechanism of Sintered Nd-Fe-B[J]. Chinese Journal of High Pressure Physics, 2019, 33(5): 054201. doi: 10.11858/gywlxb.20190746
Citation: WAN Yin, WANG Huanran, CHU Guangxiang, REN Chunying. Spall Strength and Fracture Mechanism of Sintered Nd-Fe-B[J]. Chinese Journal of High Pressure Physics, 2019, 33(5): 054201. doi: 10.11858/gywlxb.20190746

烧结钕铁硼的层裂强度及断裂机理

doi: 10.11858/gywlxb.20190746
基金项目: 国家自然科学基金(11572164)
详细信息
    作者简介:

    万 印(1993-),男,硕士研究生,主要从事冲击动力学研究. E-mail: 1049570443@qq.com

    通讯作者:

    王焕然(1976-),男,博士,副教授,主要从事冲击动力学研究. E-mail: wanghuanran@nbu.edu.cn

  • 中图分类号: O347.1; TM273

Spall Strength and Fracture Mechanism of Sintered Nd-Fe-B

  • 摘要: 利用一级气体炮对烧结钕铁硼(Nd-Fe-B)永磁材料进行平板撞击实验,实现一维应变下的层裂;采用激光干涉测速技术,测量样品自由面粒子速度历史,确定了冲击压缩后层裂强度与加载应力的关系。结果表明:加载应力在0.375~2.512 GPa范围内时,层裂强度随着加载应力的增加先增加后减小,存在一个阈值,当加载应力超过该阈值时,材料发生压缩损伤,层裂强度随之减小。通过扫描电子显微镜观察样品断口形貌,发现在冲击载荷下烧结钕铁硼出现明显的穿晶断裂。

     

  • 图  实验装置示意图

    Figure  1.  Schematic of experimental setup

    图  层裂原理示意图

    Figure  2.  Schematic illustration of spall process

    图  层裂强度与加载应力的关系

    Figure  4.  The relationship between spall strength and impact stress

    图  层裂实验样品的自由面速度剖面

    Figure  3.  Free surface velocity profile of the sample in the spall experiment

    图  断口的SEM图像

    Figure  5.  SEM images of the fractured surface

    表  1  飞片材料的Hugoniot参数[9]

    Table  1.   Hugoniot parameters of flyers[9]

    Material${\rho _{0{\rm{i}}}}$$/({\rm{g}} \cdot {\rm{c}}{{\rm{m}}^{ - 3}})$${c_{0{\rm{i}}}}$$/({\rm{km}} \cdot {{\rm{s}}^{ - 1}})$${\lambda _{\rm{i}}}$
    PMMA1.1862.651.54
    LY122.7845.371.29
    下载: 导出CSV

    表  2  烧结钕铁硼层裂实验参数和结果

    Table  2.   Parameters and results of spall experiments for Nd-Fe-B

    Exp. No.Material of flyerThickness of flyer/mmV/(m·s–1)Thickness of sample/mm$\sigma $/GPa${\sigma _{{\rm{sp}}}}$/GPa
    01PMMA1.17122.673.990.3750.209
    02PMMA1.16173.993.990.5500.249
    03PMMA1.17230.723.960.7390.263
    04LY122.28146.333.951.5910.274
    05LY122.33161.903.901.7370.313
    06LY122.28190.893.942.0920.251
    07LY122.34230.733.952.5120.224
    下载: 导出CSV
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出版历程
  • 收稿日期:  2019-03-25
  • 修回日期:  2019-04-22

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