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相关概念视频

Stress Concentrations in Circular Shafts01:18

Stress Concentrations in Circular Shafts

150
Consider the elastic torsion formula, which applies to a circular shaft with a consistent cross-section. This formula assumes that the shaft's ends are loaded with rigid plates firmly attached. However, in many cases, torques are applied to the shaft through mechanisms like flange couplings or gears, which are connected by keys inserted into keyways. This application method modifies the stress distribution near the point of torque application, causing it to deviate from the distributions...
150
Transmission Shafts: Problem Solving01:09

Transmission Shafts: Problem Solving

195
Designing a solid shaft that transmits power from a motor to a machine tool involves a series of calculations to ensure the shaft can withstand the stresses applied by bending moments and torques. First, calculate the torque exerted on the gear, considering the power transmitted by the shaft and its rotational speed. Following this, compute the tangential forces acting on the gears, which directly relate to the torque and the gear radius.
Next, use bending moment diagrams for the shaft to...
195
Eccentric Axial Loading in a Plane of Symmetry01:16

Eccentric Axial Loading in a Plane of Symmetry

148
Eccentric axial loading occurs when an axial load is applied away from the centroidal axis of a structural member. This scenario is common in engineering, where structural elements may not be directly aligned due to various design or functional requirements.
148
Thin-Walled Hollow Shafts01:15

Thin-Walled Hollow Shafts

155
In analyzing a thin-walled hollow shaft subjected to torsional loading, a segment with width dx is isolated for examination. Despite its equilibrium state, this segment faces torsional shearing forces at its ends. These forces are quantitatively described by the product of the longitudinal shearing stress on the segment's minor surface and the area of this surface, leading to the concept of shear flow. This shear flow is consistent throughout the structure, indicating a uniform distribution...
155
Angle of Twist: Problem Solving01:13

Angle of Twist: Problem Solving

248
An electric motor applies a torque of 700 N·m to an aluminum shaft, triggering a stable rotation. Two pulleys, B and C, are subjected to torques of 300 N·m and 400 N·m, respectively. The modulus of rigidity is provided as 25 GPa. With the knowledge of the length and diameter of each segment, the twist angle between the two pulleys can be computed. First, a section cut is made between pulleys B and C, and the cut cross-section is analyzed using a free-body diagram. Given that the...
248
Deformation in a Circular Shaft01:10

Deformation in a Circular Shaft

251
One of the distinctive characteristics of circular shafts is their ability to maintain their cross-sectional integrity under torsion. In other words, each cross-section continues to exist as a flat, unaltered entity, simply rotating like a solid, rigid slab. To understand the distribution of shearing stress within such a shaft, consider a cylindrical section inside this circular shaft. This section has a length of L and a radius of R, with one end fixed. The radius of the cylindrical section is...
251

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相关实验视频

Updated: May 15, 2025

Twin-Screw Extrusion Process to Produce Renewable Fiberboards
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模拟和结构优化一个古怪的旋转机挤出机料部分的模拟.

Jinhui Jiang1,2, Yanhong Feng1,2, Shuo Gao1,2

  • 1The National Engineering Research Center of Novel Equipment for Polymer Processing, South China University of Technology, Guangzhou 510641, China.

Materials (Basel, Switzerland)
|May 14, 2025
PubMed
概括

异常转子挤出机 (ERE) 有效地处理高粘度聚合物. 离散元件方法 (DEM) 模拟优化了其双腔料,提高了29.8%的输送能力,并增强了材料加工.

关键词:
离散元素方法的离散元素方法.异常旋转机挤出机 异常旋转机挤出机料开口设计 料开口设计食部分模拟模拟固体输送过程 固体输送过程

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07:21

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科学领域:

  • 聚合物工程 聚合物工程
  • 材料科学 材料科学 材料科学
  • 机械工程 机械工程

背景情况:

  • 异常转子挤出机 (ERE) 在加工高粘性聚合物方面表现出色.
  • 与传统的挤出机相比,ERE中的固体输送质量转移是不太了解的.
  • 本研究涉及ERE固体输送段中的新型质量转移机制.

研究的目的:

  • 用离散元件方法 (DEM) 模拟来建模和分析ERE中的固体输送过程.
  • 澄清质量转移原理和量化输送能力,以优化ERE设计.
  • 调查和解决与双腔料和影响挤出产量的低填充水平相关的问题.

主要方法:

  • 利用离散元件方法 (DEM) 模拟来建模固体输送过程.
  • 视觉化了ERE内部的正位移传送机制.
  • 分析了输出参数和粒子坐标数据,以量化输送能力.
  • 提出并模拟了一个优化的双腔料开口结构.

主要成果:

  • DEM模拟证实了ERE通过螺旋腔运动的正位移传递性.
  • 确定了双腔养和低填充水平是导致输出波动和容量减少的原因.
  • 优化的双料开口结构使料容量增加了29.8% (从3953颗粒/空腔增加到5132颗粒).
  • 在两个腔之间实现了平衡的填充,并将实验输出从165.3g/min提高到231.7g/min.

结论:

  • ERE证明了高粘度材料的有效正位移传输.
  • 优化双腔料开口结构显著提高输送能力和输出稳定性.
  • 模拟结果与实验验证一致,支持拟议的设计改进.