• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文学位 >Solid freeform fabrication as a method for creation of structures with multiple materials.
【24h】

Solid freeform fabrication as a method for creation of structures with multiple materials.

机译：固态自由形式制造作为一种创建具有多种材料的结构的方法。

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Solid freeform fabrication (SFF) methods enable the creation of new structures with multiple materials. While the ability to put any material in any location during the building process allows the freedom to create most any combination, it does not readily suggest the best combination for a given task. The performance demands of a structural member differ from those of a sensor and hence would have different criteria for optimal structures. The methods used herein begin to show how the interaction of the different materials impacts their performance experimentally and can be modeled to determine preferred structures. In this work structures were formed by SFF comprising multiple materials with two areas examined: metal-ceramic monoliths and embedded polymer sensors within composite structures.; The Metal-ceramic monoliths consisted of a SFF ceramic preform which was subsequently infiltrated with metal resulting in a graded structure, pure ceramic on one side and nearly pure metal on the other. These structures showed improved toughness over pure ceramic structures when tested in bending. Different metal-ceramic interface gradings were modeled based on the experimental samples, including variations of ceramic content. The model showed that the optimal structure was dependent on the orientation during mechanical testing, or application, as well as the ceramic content of the monolith.; Embedded poly vinylidene fluoride (PVF2) sensors were used to monitor internal stresses in composite systems. The PVF2 sensors were shown to be capable of detecting damage over the range light tapping to severe impact. More importantly the sensors were able to detect barely visible impact damage (BVID), which can lead to deterioration of mechanical performance without visible evidence. Additionally the PVF2 sensors were used to monitor cure of epoxy systems by sensing the modulus of the matrix. It was shown that for a fixed impact level the sensor response varied as the relative modulus of matrix to sensor changed. Modeling confirmed that when the sensor modulus is much higher than the matrix the stress level in the sensor is higher. The model also showed that the stress level in the sensor is dependent on the geometry and loading, with smaller sensors performing better.
机译：固态自由形式制造（SFF）方法可以创建具有多种材料的新结构。虽然在构建过程中可以将任何材料放置在任何位置的能力允许自由地创建大多数组合，但是对于给定的任务，它并不容易建议最佳组合。结构构件的性能要求不同于传感器的性能要求，因此对于最佳结构将具有不同的标准。本文中使用的方法开始显示不同材料的相互作用如何在实验上影响其性能，并可以进行建模以确定优选的结构。在这项工作中，由SFF形成的结构包括多种材料，并检查了两个区域：金属陶瓷整体结构和复合结构内的嵌入式聚合物传感器。金属陶瓷整体件由SFF陶瓷预成型坯组成，随后将其浸渗入金属以形成渐变结构，一侧为纯陶瓷，另一侧为近乎纯金属。当进行弯曲测试时，这些结构比纯陶瓷结构具有更高的韧性。根据实验样品对不同的金属-陶瓷界面等级进行建模，包括陶瓷含量的变化。该模型表明，最佳结构取决于机械测试或应用过程中的取向以及整料的陶瓷含量。嵌入式聚偏二氟乙烯（PVF2）传感器用于监视复合系统中的内部应力。显示PVF2传感器能够检测轻敲到严重撞击的范围内的损坏。更重要的是，传感器能够检测到几乎看不见的冲击损伤（BVID），这可能导致机械性能下降而没有可见的证据。此外，PVF2传感器还用于通过检测基质的模量来监控环氧体系的固化。结果表明，对于固定的冲击水平，传感器响应随基质对传感器的相对模量变化而变化。建模证实，当传感器模量远高于矩阵时，传感器中的应力水平会更高。该模型还表明，传感器中的应力水平取决于几何形状和载荷，较小的传感器性能更好。

著录项

  • 作者

    Denham, Hugh Brett.;

  • 作者单位

    The University of Arizona.;

  • 授予单位 The University of Arizona.;
  • 学科 Engineering Materials Science.
  • 学位 Ph.D.
  • 年度 2002
  • 页码 205 p.
  • 总页数 205
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程材料学;
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号