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相关概念视频

Temperature Dependent Deformation01:12

Temperature Dependent Deformation

In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added together...
Plastic Deformation in Circular Shafts01:20

Plastic Deformation in Circular Shafts

When materials are subjected to forces that surpass their yield strength, they undergo a process known as plastic deformation. This results in a permanent alteration or strain in their structure. This concept can be specifically applied to circular shafts, where the deformation leads to a change in its shape. The precise evaluation of this plastic deformation requires understanding the stress distribution within the circular shaft, which is achieved by calculating the maximum shearing stress in...
Plastic Deformations01:14

Plastic Deformations

It is essential to understand how structural members behave under plastic deformation when the bending stress exceeds the material's yield strength. This state of deformation permanently alters the shape of the member, in contrast to the linear elastic behavior observed before yielding. The strain at any point in the member is expressed in terms of maximum strain. Notably, the neutral axis, which coincides with the centroid during elastic bending, shifts away from the centroid under plastic...
Plastic Deformations of Members with a Single Plane of Symmetry01:21

Plastic Deformations of Members with a Single Plane of Symmetry

When a structural member undergoes plastic deformation due to bending, it is crucial to understand the position of the neutral axis and the stress distribution. This member, characterized by a single plane of symmetry, exhibits a uniform stress distribution, with negative stress above the neutral axis and positive stress below. Notably, the neutral axis does not align with the centroid of the cross-section. This misalignment is typical in cases where the cross-section is not rectangular or...
Bending of Curved Members - Strain Analysis01:14

Bending of Curved Members - Strain Analysis

The mechanics of deformation in curved members, such as beams or arches, under bending moments, involve complex responses. When such a member, symmetric about the y-axis and shaped like a segment of a circle centered at point C, is subjected to equal and opposite forces, its curvature and surface lengths change significantly. This alteration results in the shift of the curvature's center from C to C', indicating a tighter curve.
The important part of bending analysis for such a member is the...
Deformation of a Beam under Transverse Loading01:15

Deformation of a Beam under Transverse Loading

Understanding beam deflection, particularly for indeterminate beams with overhanging segments and multiple concentrated loads, is crucial for ensuring structural integrity and functionality. The process begins with constructing an accurate free-body diagram, which helps identify the forces and moments acting on the beam. This diagram is vital for visualizing how bending moments vary along the beam's length, influencing its curvature.
The insights from the bending moment diagram extend to...

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构建-构建"轨道技术"在脊柱形纠正机动期间降低了螺丝拉伸:机械分析

Alekos A Theologis1, Jason DePhillips2, Nathaniel A Myers3

  • 1Department of Orthopaedic Surgery, University of California - San Francisco (UCSF), 500 Parnassus Ave, MUW 3rd Floor, San Francisco, CA, 94143, USA. alekos.theologis@ucsf.edu.

Spine deformity
|March 28, 2025
PubMed
概括

"轨道"技术在脊柱形纠正过程中显著减少了螺丝拉伸,降低了螺丝拉出和的风险. 这种方法使压力更均地分布在靠近骨折的脚螺丝上.

关键词:
三柱骨切除术是指三柱骨切除术.悬臂杆曲曲的情况纠正技巧 纠正技巧分段压缩压缩.脊柱形是因为脊柱形.

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科学领域:

  • 脊柱手术 生物力学 脊柱手术
  • 整形外科的植入物研究研究.

背景情况:

  • 脊椎骨切除术对于纠正形至关重要.
  • 脚螺丝固定是稳定脊柱的一种常见方法.
  • 高螺丝应变可能导致构造故障,例如螺丝拉出或.

研究的目的:

  • 为了比较与模拟脊髓骨折相邻的螺丝拉伸.
  • 在细分压缩 (SC) 和支架曲 (CB) 下评估应变.
  • 为了评估传统构造与构造到构造的横向辅助杆 ("轨道") 的传统构造的变种.

主要方法:

  • 10个PCF泡块,每个都有6个脚螺丝.
  • 张力表测量了实时的螺丝拉伸.
  • SC和CB在传统的中线杆或"轨道"结构上进行.

主要成果:

  • 与传统的SC相比",轨道"技术显著减少了骨折附近的螺丝拉伸.
  • 使用"轨道"SC和CB的最大螺丝拉伸明显较低.
  • 使用"轨道"技术,螺丝应变在所有螺丝上分布得更均.

结论:

  • "轨道"配件杆显著降低了靠近脊柱骨折的脚螺丝拉伸.
  • 这种技术可以减少在形纠正过程中螺丝拉出和的风险.
  • 建议对尸体进行进一步的研究,以在临床场景中验证这些发现.