基于离散元法预测碳化硅陶瓷的高温力学性能
Predicting High Temperature Mechanical Properties of SiC Ceramic Based on Discrete Element Method
摘 要
采用离散元法建立并校准了碳化硅陶瓷的离散元模型, 建立了脆性材料的热力学模型, 模拟了不同温度下的单轴压缩试验及三点弯曲试验, 分析了碳化硅陶瓷在不同温度下的应力-应变曲线、力学性能参数以及单轴压缩的破坏形态。结果表明: 当温度低于500 ℃时, 温度场对材料的力学响应及力学性能参数基本没有影响; 但随着温度的逐渐升高, 材料的弹性模量逐渐降低, 泊松比逐渐增大, 抗压强度和抗弯强度也随之降低, 材料的破坏形态由脆性断裂逐渐向塑性变形转变, 且在失效过程中伴随有软化现象。
高温力学性能
预测
离散元
SiC
high temperature mechanical property
prediction
discrete element method(DEM)
Abstract
A discrete element method (DEM) model of SiC ceramic was calibrated based on the discrete element method, the thermodynamic model of brittle materials was established, and the uniaxial compression test and three-point bending test at different temperature were carried out, the stress-strain curves, mechanical properties parameters and the failure modes during uniaxial compression tests for SiC ceramic at different temperature were also analyzed. The results show that, if the temperature was less than 500 ℃, there was a little effects on mechanical response and mechanical properties of SiC ceramic. But with the increase of temperature, the elastic modulus decreased while poisson′s ratio increased, and the compressive strength and bending strength also decreased, and the failure mode of SiC ceramic was changed from brittle fracture to plastic deformation gradually, and some softening phenomenons accompanied with the failure process.
中图分类号 TB32
所属栏目 物理模拟与数值模拟
基金项目 国家自然科学基金资助项目(51275436,51005194); 湘潭大学博士科研启动基金资助项目(12QDZ22); 湖南省青年人才联合培养基金项目(14JJ6013)
收稿日期 2012/12/19
修改稿日期 2013/10/16
网络出版日期
作者单位点击查看
备注姜胜强(1986-), 男, 湖南湘潭人, 讲师, 博士。
引用该论文: JIANG Sheng-qiang,TAN Yuan-qiang,ZHANG Gao-feng,PENG Rui-tao. Predicting High Temperature Mechanical Properties of SiC Ceramic Based on Discrete Element Method[J]. Materials for mechancial engineering, 2014, 38(1): 74～78
姜胜强,谭援强,张高峰,彭锐涛. 基于离散元法预测碳化硅陶瓷的高温力学性能[J]. 机械工程材料, 2014, 38(1): 74～78
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【3】刘孝福,娄延春,苏贵桥,等.定向凝固用陶瓷型壳高温力学性能研究现状［J］.特种铸造及有色合金,2010,30(10):913-917,983.
【4】黄小萧, 温广武, 程显明.A14SiC4陶瓷的高温抗氧化性能和高温力学性能的研究［J］.材料工程, 2004(12): 32-35.
【5】白世鸿,乔生儒,舒武炳,等.先进结构陶瓷高温力学性能测试与表征［J］.材料工程,2000(10):45-48.
【6】朱伟, 肖继军, 马秀芳, 等.不同温度下RDX晶体力学性能的MD模拟［J］.火炸药学报, 2007,30(4): 17-19, 24.
【7】王超, 梁军, 栾旭. 防热陶瓷材料高温力学性能及断裂模式的分子动力学模拟［J］.材料工程, 2008(增1):239-242.
【8】CUNDALL P A, STRACK O D L. A discrete numerical model for granular assembles ［J］.Géotechnique,1979,299(1):47-65.
【9】HUANG H. Discrete element modeling of tool-rock interaction ［D］.Minnesota: University of Minnesota,1999.
【10】HZENTZ S, DONZE F V, DAUDEVILLE L. Discrete element modeling of concrete submitted to dynamic loading at high strain rates［J］.Computers and Structures,2004,82:2509-2524.
【11】姜胜强,谭援强,聂时君,等.碳化硅陶瓷预应力加工的离散元模拟与实验研究［J］.无机材料学报,2010,25(12):1286-1290.
【12】TAN Yuan-qiang, YANG Dong-min, SHENG Y . Discrete element method (DEM) modeling of fracture and damage in the machining process of polycrystalline SiC［J］.Journal of the European Ceramic Society,2009,29:1029-1037.
【13】TAN Yuan-qiang, YANG Dong-min, SHENG Y . Study of polycrystalline Al2O3 machining cracks using discrete element method ［J］.International Journal of Machine Tool & Manufacture,2008,48:975-982.
【14】CUNDALL P A. PFC2D user′s manual［M］.Version 3. Lakewood,Colorado, USA: Itasca Consulting Group Inc,2002.
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