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首页> 外文学位 >Discrete element modelling of silicon nitride ceramics: Crack formation and propagation in indentation test and four point bending test .
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Discrete element modelling of silicon nitride ceramics: Crack formation and propagation in indentation test and four point bending test .

机译：氮化硅陶瓷的离散元素建模：压痕测试和四点弯曲测试中的裂纹形成和扩展。

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摘要

Advanced ceramic materials have been extensively used in aerospace, automobile and other industries. However, the reliability of the advanced ceramics is the major concern because of the brittle nature of the materials. This work aims to model silicon nitride ceramics using Discrete Element Method (DEM) and simulating the crack formation and propagation. DEM software package PFC 2D is used to simulate indentation test and four point bending test on silicon nitride ceramics and the behaviour of crack formation and propagation is identified. The numerical representation of ceramic materials is done by generating a densely packed particle system using the specimen genesis procedure and then applying the suitable microparameters to the particle system. Indentation test has been performed on the sample with different loading forces and the width and depth of cracks generated have been studied. Four point bending test has been simulated and the fracture origins has been identified. Simulation of four point bending test is performed on sample having no defects, sample having manufacturing-induced defects like cracks, and sample having material-inherent flaws like voids. For the above cases the initiation and propagation of defects is simulated and the mean contact force on the loading ball is also obtained and plotted. The simulation prediction results are well in accordance with the experimental nondestructive testing results.
机译：先进的陶瓷材料已广泛用于航空航天，汽车和其他行业。然而，由于材料的脆性，高级陶瓷的可靠性是主要关注的问题。这项工作旨在使用离散元方法（DEM）对氮化硅陶瓷进行建模，并模拟裂纹的形成和扩展。使用DEM软件包PFC 2D模拟氮化硅陶瓷的压痕测试和四点弯曲测试，并确定裂纹形成和扩展的行为。陶瓷材料的数值表示是通过使用标本生成程序生成密集堆积的粒子系统，然后将适当的微参数应用于粒子系统来完成的。对具有不同加载力的样品进行了压痕测试，并研究了产生的裂纹的宽度和深度。模拟了四点弯曲试验，并确定了断裂起源。对没有缺陷的样品，具有制造引起的缺陷（如裂纹）和具有材料固有缺陷（如空隙）的样品执行四点弯曲测试的模拟。对于上述情况，模拟了缺陷的产生和传播，并获得了载荷球上的平均接触力并进行了绘制。仿真预测结果与实验无损检测结果吻合良好。

著录项

  • 作者

    Senapati, Rajeev.;

  • 作者单位

    The University of Texas at El Paso.;

  • 授予单位 The University of Texas at El Paso.;
  • 学科 Engineering Industrial.
  • 学位 M.S.
  • 年度 2009
  • 页码 67 p.
  • 总页数 67
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 语言学;
  • 关键词

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