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Effect of loading rate and peak stress on the elastic limit of dynamically compressed brittle single crystals.

机译：加载速率和峰值应力对动态压缩的脆性单晶弹性极限的影响。

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摘要

To examine the effect of loading rate on the compressive elastic limit of brittle solids, shockless and shock compression experiments were conducted on x-cut and z-cut quartz crystals. A compact pulsed power generator was used to achieve shockless compression at stresses up to 16 GPa in x-cut quartz and 18 GPa in z-cut quartz. Plate impacts generated shock compression to elastic impact stresses up to 16 GPa in x-cut quartz and 37 GPa in z-cut quartz. Transmitted wave profiles were recorded at the interface between the quartz crystals and LiF windows using a velocity interferometer. The shockless (loading rate ∼ 105--106 s-1) elastic limit of x-cut quartz was ∼ 11 GPa, a significant increase over the shock wave (loading rate > 107 s-1) elastic limit of ∼ 6 GPa. The shockless elastic limit of z-cut quartz, ~ 14 GPa, was also higher than the shock wave elastic limit of ~ 12 GPa. The increase in elastic limit with a decrease in loading rate is contrary to the expected loading rate dependence of material strength, and cannot be explained by usual inelastic deformation models. A strain energy localization model is proposed to explain the observed loading rate dependence for the quartz elastic limit. Strain energy localization is incorporated using dynamic stress concentrations in a shear cracking model. Constant loading rate calculations, performed using the model, provided results that were in qualitative agreement with the measured elastic limit-loading rate dependence.;To examine the effect of impact stress on the elastic limit of brittle solids, shock wave experiments were conducted on 3.2 mm thick, [100] and [111] gadolinium gallium garnet (GGG) crystals. Elastic impact stresses ranged from 15 to 50 GPa. Velocity interferometry measurements at the interface between GGG samples and LiF windows, together with impact pins, were used to measure transmitted shock and particle velocities. The measured elastic limits were strongly dependent on the impact stresses for both GGG orientations, and ranged from 13 GPa at an elastic impact stress of 17 GPa to 34 GPa at an elastic impact stress of 50 GPa.
机译：为了检查加载速率对脆性固体压缩弹性极限的影响，对X切割和Z切割石英晶体进行了无冲击和冲击压缩实验。使用紧凑型脉冲发电机在x切割石英中达到16 GPa，在z切割石英中达到18 GPa的压力下实现无冲击压缩。板碰撞产生的冲击压缩导致X切石英的弹性冲击应力高达16 GPa，Z切石英的弹性冲击应力高达37 GPa。使用速度干涉仪在石英晶体和LiF窗口之间的界面处记录了透射波剖面。 X切面石英的无冲击（加载速率〜105--106 s-1）弹性极限为〜11 GPa，比冲击波（加载速率> 107 s-1）的弹性极限〜6 GPa显着增加。 Z形切割石英的无冲击弹性极限约为14 GPa，也高于〜12 GPa的冲击波弹性极限。弹性极限随加载速率的降低而增加，这与材料强度的预期加载速率依赖性相反，并且无法用常规的非弹性变形模型来解释。提出了应变能局部化模型来解释观察到的加载速率对石英弹性极限的依赖性。应变能局部化是在剪切裂纹模型中使用动态应力集中来实现的。使用该模型进行的恒定载荷速率计算提供的结果与所测得的弹性极限载荷速率相关性在质量上吻合。为了检查冲击应力对脆性固体弹性极限的影响，在3.2上进行了冲击波实验毫米厚的[100]和[111] ado镓石榴石（GGG）晶体。弹性冲击应力范围为15至50 GPa。使用GGG样品和LiF窗口之间的界面处的速度干涉测量以及冲击销来测量传播的冲击和粒子速度。所测量的弹性极限在很大程度上取决于两个GGG方向的冲击应力，其范围从17 GPa的弹性冲击应力为13 GPa到50 GPa的弹性冲击应力为34 GPa。

著录项

  • 作者

    LaLone, Brandon Michael.;

  • 作者单位

    Washington State University.;

  • 授予单位 Washington State University.;
  • 学科 Applied Mechanics.;Physics Solid State.
  • 学位 Ph.D.
  • 年度 2011
  • 页码 249 p.
  • 总页数 249
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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