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相关概念视频

Design Example: Managing Concrete Workability01:14

Design Example: Managing Concrete Workability

116
This example deals with managing the workability of concrete for a raft foundation project under hot weather conditions. Workability is crucial for ensuring the concrete is easy to place, compact, and finish. In this scenario, a slump test — a common method to measure the workability of fresh concrete — initially indicated low workability. This was attributed to the rapid water loss from the concrete mix, exacerbated by the high temperatures causing the course aggregates to heat up.
116
Spanning Openings in Brick Walls01:20

Spanning Openings in Brick Walls

245
In brick wall construction, supporting structures are crucial for openings like windows and doors to maintain the integrity and support the weight of the wall above. These supports include lintels, corbels, and arches, each serving specific structural purposes.
Lintels are primary supports used to span openings and can be crafted from materials such as reinforced concrete, steel-reinforced brick masonry, or simple steel angles. These are straightforward to install and are typically concealed...
245
Elasticity in Concrete01:20

Elasticity in Concrete

128
Upon subjecting concrete to moderate or high uniaxial compressive or tensile stresses, the strain response is non-linear relative to the stress applied. As the stress is removed, the resulting stress-strain curve deviates from the original path traced during loading, creating a hysteresis loop, indicative of the concrete's non-linear and non-elastic properties. Typically, a material's modulus of elasticity, which is a measure of the material's stiffness, is inferred from the linear...
128
Bending of Material: Problem Solving01:09

Bending of Material: Problem Solving

239
In this lesson, determine the ratio of the maximum bending moments applied to two metal pipes, given that both pipes can withstand a maximum stress of 100 MPa. Both pipes have an outer radius of 1.8 cm. Pipe A has an inner radius of 1.5 cm, and Pipe B has an inner radius of 1 cm. The ratio of the maximum bending moment applied to two metallic pipes, each with a different inner and outer radius, is determined by considering their dimensions. The inner radius of the first pipe is 1.5 cm, and for...
239
Mortar Properties01:17

Mortar Properties

176
Mortar properties encompass a range of characteristics crucial for construction and masonry work, including workability, water retention, bond strength, durability, compressive strength, volume change, and appearance. Workability refers to mortar's ability to be easily applied and manipulated without sagging or falling off surfaces, which is important for efficient masonry unit placement and alignment. Water retention is essential to prevent the mortar from losing moisture too quickly to...
176
Dynamic Modulus of Elasticity of Concrete01:16

Dynamic Modulus of Elasticity of Concrete

518
The dynamic modulus of elasticity assesses how a concrete structure deforms under impact or dynamic loads. It is typically higher than the static modulus of elasticity, measured under slow, steady loading conditions.
The sonic test is a common method to determine the dynamic modulus. In this test, a concrete beam, sized either 6 x 6 x 30 inches or 4 x 4 x 20 inches, is clamped at its center. Vibrations are initiated at one end of the beam by an electromagnetic exciter unit powered by...
518

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具有可编程性质的不规则结构材料的生长规则

Ke Liu1,2, Rachel Sun1, Chiara Daraio1

  • 1Department of Mechanical and Civil Engineering, California Institute of Technology, Pasadena, CA 91125, USA.

Science (New York, N.Y.)
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科学领域:

  • 材料科学
  • 生物材料工程
  • 计算模型

背景情况:

  • 生物材料通常具有复杂,不规则的微观结构,有助于它们的功能效率.
  • 微观结构不规则性和材料特性之间的关系尚未完全理解,这限制了工程材料设计.

研究的目的:

  • 在几何不规则的生物材料中研究基本的概率结构特性关系.
  • 开发工程材料的计算方法,增强功能,如不完善的不敏感性和冲击吸收.

主要方法:

  • 基于本地规则生成随机微架构.
  • 采用基于图形的表示来建模和分析不规则材料的拓和几何.
  • 模拟材料性能以确定机械性能的控制机制.

主要成果:

  • 虚拟增长程序成功地从有限的初始资源中生成了各种功能性质的微结构.
  • 通过操纵微观结构拓和几何来控制机械性能的基本规则.
  • 展示了创造具有卓越功能的材料的潜力,包括增强的冲击吸收和应力重定向.

结论:

  • 不规则的微观结构是自然和人工系统中高效材料功能的关键.
  • 一种基于规则的概率增长方法可以有效地设计具有量身定制的机械性质的生物材料.
  • 这项工作为基于微观结构控制的可预测性能的先进材料提供了框架.