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相关概念视频

Measurement of Air Content in Concrete01:23

Measurement of Air Content in Concrete

Air content measurement in concrete is critical for ensuring structural integrity and durability of concrete structures, especially in environments prone to severe weather conditions. Accurate air content analysis optimizes concrete's resistance to freeze-thaw cycles and enhances its workability and strength. Several methods are standardized under ASTM guidelines to measure the air content in fresh concrete, each suitable for different concrete types and conditions.
The pressure method,...

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Fused Filament Fabrication FFF of Metal-Ceramic Components
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AMB2018-04:对聚胺12的粉末床融合增材制造进行基准物理性质测量

Erich D Bain1, Edward J Garboczi2, Jonathan E Seppala3

  • 1Materials and Manufacturing Sciences Division, U.S. Army Research Laboratory, Aberdeen Proving Ground, Aberdeen, MD 21005, USA.

Integrating materials and manufacturing innovation
|March 18, 2024
PubMed
概括

聚胺12 (PA12) 部件的激光烧结 (LS) 需要全面的数据集. 这项研究为LS PA12提供了关键的过程结构属性数据,提高了零件质量并降低了成本.

关键词:
增材制造 增材制造是一种增材制造.激光烧结是一种激光烧结.聚胺12 12 的情况.聚合物结晶性 聚合物结晶性多孔性 多孔性

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科学领域:

  • 材料科学 材料科学 材料科学
  • 添加剂制造 添加剂制造 添加剂制造
  • 聚合物加工 聚合物加工

背景情况:

  • 聚胺12 (PA12) 的激光烧结 (LS) 对于工业零件生产至关重要.
  • 缺乏有组织的数据集增加了部件质量差和高成本的风险.
  • 现有的文献是分散在不同的机器,材料和参数.

研究的目的:

  • 为LS PA12生成一个全面的,公开可用的数据集.
  • 研究LS加工,材料结构和物理性质之间的关系.
  • 为了比较LS PA12与传统化加工材料.

主要方法:

  • 在四个构造维度上处理单个LS PA12原料.
  • 使用广泛的物理技术进行表征.
  • 与化加工的PA12进行比较.

主要成果:

  • 详细分析颗粒大小和形状分布.
  • 通过LS处理定位的半晶相变化的识别.
  • 评估化学老化对融粘度的影响.
  • 相对于构建轴的孔隙性方向的表征.
  • 对微结构对拉伸性能和故障机制的影响的评估.

结论:

  • 这项研究为LS PA12行为提供了新的见解.
  • 公共可用的数据集将有助于建模者和实践者.
  • 预计LS制造的零件的认证性和重复性将得到改善.