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相关概念视频

Torsion of Noncircular Members01:16

Torsion of Noncircular Members

121
Circular shafts undergoing torsional stress maintain their cross-sectional integrity due to their axisymmetric nature. This symmetry ensures an even distribution of stress, allowing the shaft to withstand torsion without distorting. In contrast, square bars, lacking this axial symmetry, experience significant distortion across their cross-sections when subjected to torsion, with the exception of along their diagonals and at lines connecting midpoints. A detailed examination of a cubic element...
121
Stress Concentrations in Circular Shafts01:18

Stress Concentrations in Circular Shafts

161
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...
161
Stresses under Combined Loadings01:23

Stresses under Combined Loadings

138
When analyzing a bent tube with a circular cross-section subjected to multiple forces, it is crucial to determine the stress distribution in order to maintain structural integrity under varied load conditions.
The process begins by slicing the tube at critical points and analyzing the internal forces and stress components at these sections, focusing on the centroid. Normal stresses, generated by axial forces and bending moments, are either compressive or tensile and vary across the section from...
138
Design of Transmission Shafts - Stress Analysis01:15

Design of Transmission Shafts - Stress Analysis

307
Designing a transmission shaft requires a thorough understanding of the stresses induced by bending moments and torques, especially in systems where power is transferred through gears. These forces create force-couple systems at the centers of the shaft's cross-sections, leading to both transverse and torsional loading. Although shearing stresses from transverse loads are typically smaller than those from torques and are often overlooked, the significant normal stresses from these loads...
307
Thin-Walled Hollow Shafts01:15

Thin-Walled Hollow Shafts

162
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...
162
Deformation in a Circular Shaft01:10

Deformation in a Circular Shaft

260
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...
260

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Updated: May 27, 2025

Finite Element Modeling for the Simulation of the Quasi-Static Compression of Corrugated Tapered Tubes
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关于子干矩形圆连接的计算研究:角不匹配,组合和循环负荷的影响.

R Cromi1, L Ciriello1, F Berti1

  • 1Laboratory of Biological Structure Mechanics, Department of Chemistry, Materials and Chemical Engineering "Giulio Natta" (LaBS), Politecnico di Milano, Milano, Italy.

International journal for numerical methods in biomedical engineering
|February 19, 2025
PubMed
概括

双模块关节假体的部干连接可以提前失败. 优化形几何学和了解组装力,患者的BMI和外部负载,可以显著提高疲劳强度并降低故障风险.

关键词:
这是一种双模块关节假体.疲劳耐受性 耐疲劳性 耐疲劳性有限元分析是有限元分析.模块化部设计 模块化部设计

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科学领域:

  • 生物材料工程 生物材料工程
  • 整形外科手术 整形外科手术
  • 机械工程 机械工程

背景情况:

  • 双模块关节假肢具有矩形的部干缩,提供定制性,但风险是早期失败.
  • 影响连接完整性的因素包括加工公差,植入力和患者的身体质量指数 (BMI).
  • 有限的文献存在于部茎合的疲劳行为.

研究的目的:

  • 调查矩形形形状和外部负荷对双模块关节假肢疲劳强度的影响.
  • 分析角度不匹配,组装力,患者的BMI和外平面负荷对植入物性能的影响.

主要方法:

  • 开发了一个3D有限元模型 (FEM),以模拟基于公差限制的九个子-茎合配置.
  • 模拟使用- (CoCr) 项和合金 (Ti6Al4V) 茎进行,灵感来自ISO 7206标准.
  • 分析包括不同的组装力和循环垂直负荷的应用,其中一个配置被评估为外平面负荷效应.

主要成果:

  • 积极的角度不匹配,促进近距离接触,通过降低压力高达33%,增强疲劳寿命.
  • 增加的组装力提高了子的稳定性,减少了过度应力区域.
  • 植入物疲劳阻力与患者的BMI正相关.
  • 外平面负荷增加了40%的疲劳失败风险.

结论:

  • 优化矩形形几何形状,特别是管理角不匹配,对于提高双模块关节假肢疲劳强度至关重要.
  • 组装力和患者的BMI是影响植入物耐用性的重要因素.
  • 了解各种负荷条件的影响,包括外平面力,对于预测和预防早期植入物失效至关重要.