KDP晶体三倍频晶面微观力学行为及加工性能

郭晓光; 刘子源; 郑桂林; 郭东明

doi:10.3788/OPE.20162402.0398

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KDP晶体三倍频晶面微观力学行为及加工性能

微纳技术与精密机械 | 更新时间：2020-08-13

- KDP晶体三倍频晶面微观力学行为及加工性能
- Micro-mechanical behavior and machining property for tripler plane of KDP crystal
- 光学精密工程 2016年24卷第2期页码：398-405
- 作者机构：
  
  大连理工大学精密与特种加工教育部重点实验室,辽宁大连,116021
- 作者简介：
- 基金信息：
  
  国家自然科学基金重点项目(No.51135002)();国家自然科学基金创新研究群体科学基金资助项目(No.51321004)();中央高校基本科研业务费专项资金资助项
- DOI：10.3788/OPE.20162402.0398
  中图分类号： O733.1;O786
- 收稿日期：2015-06-01，
  
  修回日期：2015-08-18，
  
  纸质出版日期：2016-02-25
- 稿件说明：
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郭晓光, 刘子源, 郑桂林等. KDP晶体三倍频晶面微观力学行为及加工性能[J]. 光学精密工程, 2016,24(2): 398-405

GUO Xiao-guang, LIU Zi-yuan, ZHENG Gui-lin etc. Micro-mechanical behavior and machining property for tripler plane of KDP crystal[J]. Editorial Office of Optics and Precision Engineering, 2016,24(2): 398-405
郭晓光, 刘子源, 郑桂林等. KDP晶体三倍频晶面微观力学行为及加工性能[J]. 光学精密工程, 2016,24(2): 398-405 DOI： 10.3788/OPE.20162402.0398.

GUO Xiao-guang, LIU Zi-yuan, ZHENG Gui-lin etc. Micro-mechanical behavior and machining property for tripler plane of KDP crystal[J]. Editorial Office of Optics and Precision Engineering, 2016,24(2): 398-405 DOI： 10.3788/OPE.20162402.0398.

摘要

为了揭示磷酸二氢钾(KDP)晶体三倍频晶面微观弹塑性力学行为及加工性能

开展了纳米压痕研究。建立了KDP晶体三倍频晶面各向异性力学模型

基于光滑粒子流体动力学(SPH)方法对纳米压痕进行了数值仿真并完成了纳米压痕测试实验。实验结果表明:实验与仿真计算的载荷-压入深度关系曲线的相关系数为0.996328

吻合度较高

验证了力学模型的正确性

得出KDP晶体三倍频晶面的屈服强度为240 MPa。数值仿真结果显示:由于材料的各向异性

工件内部应力呈不规则圆弧状分布;载荷大小与等效应力影响深度呈近似线性递增关系;材料表面等效塑性应变分布形状与压头投影面几何形状相类似

存在复映效果。当载荷小于2 mN时

各压头的残余应力深度差异性较小(小于0.2m);随着载荷逐渐增大

这种差异不断扩大。得到的结果为实现KDP晶体三倍频晶面的高效低损伤加工提供了理论支撑。

Abstract

To reveal the micro elastic-plastic mechanic behavior and the machining property of tripler plane of a potassium dihydrogen phosphate(KDP) crystal

the nano-indentation process was researched. An anisotropic mechanical model for the tripler plane of KDP crystal was established. Then the nano-indentation numerical simulation based on Smoothed Particle Hydrodynamics(SPH) method was performed and the nano-indentation experiments were accomplished. The results indicate that the correlation coefficient between the experimental load-indentation depth curve and the simulation one is 0.996328

showing a higher goodness of fit and verifying the correctness of the mechanical model. Moreover

the yield strength of tripler plane of the KDP crystal is 240 MPa. Because of the anisotropy property of the material

the stress inside the workpiece is irregular arc shape distribution

and the relationship between the magnitude of load and the influence depth of equivalent stress is an approximate linear increasing. The distribution shape of equivalent plastic strain on the material surface is similar to the geometrical shape of the indenter projective plane

which verifies that the reflection effect exists. When the load is lower than 2 mN

the differences of the residual stress's depths among the indenters are less than 0.2m. As the load increases gradually

the differences are widening. The research results provide theoretical supports for machining the tripler planes of KDP crystals in high efficiency and low damage.

关键词

Keywords

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