泰勒空间框架中的环:机械测试和有限元分析
Ahmad Zamani1, Michalis Zenios2, S Olutunde Oyadiji3
1FECAD Ltd, Derby, UK.
概括
与泰勒空间框架 (TSF) 系统中的螺栓环相比,整个全环提供了更好的刚性. 较小的TSF环被发现出乎意料地比较强大,突出了对患者体重考虑的潜在设计问题.
科学领域:
- 整形外科生物力学 整形外科生物力学
- 生物医学工程 生物医学工程
- 材料科学是一种材料科学.
背景情况:
- 泰勒空间框架 (TSF) 是一个关键的六足动物外固定装置,用于骨科手术.
- 了解TSF组件的机械性能对于确保患者安全和治疗疗效至关重要.
- TSF环可提供各种配置,包括半,三分之二和整个完整的环.
研究的目的:
- 为了评估不同泰勒空间框架环形配置的压力刚度和最终负载能力.
- 为了比较完整完整环的机械性能与由两个半环构成的螺栓完整环.
- 为了研究载荷方向和环尺寸对TSF组件结构完整性的影响.
主要方法:
- 对TSF半环,三分之二环,全环和螺栓式全环进行实验压缩测试.
- 使用3D固体元素来模拟机械测试的有限元素 (FE) 分析.
- 对 FE 模型与实验负载偏移数据的验证.
- 对所有测试配置的负载偏移曲线,刚度和最终负载的分析.
主要成果:
- 与螺栓式全环相比,整个全环显示出明显更高的刚性和承载能力.
- 螺栓环的刚度因装载直径而有所不同.
- 较小的TSF环比较大的具有更大的强度,这与生物力学对患者体重的预期相反.
- 三分之二的环在与连接开放端的线平行加载时表现出最低的刚度.
结论:
- 整个全环在机械上优于泰勒空间框架应用中的螺栓配置.
- 一个潜在的设计缺陷存在于较小的TSF环比较强大的TSF环,在患者负荷下构成风险.
- 负载的方向对TSF组件的刚度有很大影响,特别是三分之二环.
更多相关视频
06:34Finite Element Modeling for the Simulation of the Quasi-Static Compression of Corrugated Tapered Tubes
Published on: January 6, 2023
1.6K
11:28A Coupled Experiment-finite Element Modeling Methodology for Assessing High Strain Rate Mechanical Response of Soft Biomaterials
Published on: May 18, 2015
12.4K
相关概念视频
01:18Stress Concentrations in Circular Shafts
155
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...
155
01:15Thin-Walled Hollow Shafts
159
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...
159
01:15Design of Transmission Shafts - Stress Analysis
300
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...
300
01:10Residual Stresses in Circular Shafts
149
In materials that exhibit elastic and plastic behavior, known as elastoplastic materials, residual stresses can accumulate when these materials experience plastic deformation. This deformation arises from either high levels of shearing stress or significant strains. Residual stresses are internal stresses that persist within a material after removing the external force causing deformation. This phenomenon is demonstrated when observing the behavior of a shaft under torque; notably, the...
149
01:10Deformation in a Circular Shaft
256
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...
256
01:30Frames
492
Frames are essential components of various mechanical and structural systems used daily. These structures are known for their stability and ability to bear heavy loads. A frame is constructed using two-force and multi-force members, interconnected using pin joints. In contrast, trusses are made entirely of two-force members.
Frames are versatile and widely used in various applications such as structural supports for beams and columns, automobile chassis construction, and in the construction...
Frames are versatile and widely used in various applications such as structural supports for beams and columns, automobile chassis construction, and in the construction...
492