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Related Concept Videos

Stability of structures01:14

Stability of structures

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In mechanical engineering, the stability of systems under various forces is critical for designing durable and efficient structures. One fundamental way to explore these concepts is by analyzing systems like two rods connected at a pivot point, O, with a torsional spring of spring constant k at the pivot point. This system is similar in appearance to a scissor jack used to change tires on a car. In this case, the arms of the linkage (equivalent to the rods in this system) are entirely vertical,...
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Applications of Stress01:04

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Consider a structure made of a boom and a rod designed to support a load. These two components are connected by a pin and stabilized by brackets and pins. The boom and the rod are detached from their supports to assess the different stresses imposed on this structure, and a free-body diagram is drawn. Then, all the forces applied, including the load acting on the structure, are identified. The reaction forces exerted on both the boom and the rod are computed using the equilibrium equations.
The...
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Frames01:30

Frames

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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.
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Frames: Problem Solving I01:24

Frames: Problem Solving I

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Consider a jib crane with an external load suspended from the pulley. The dimensions of the crane members are shown in the figure. A systematic analysis of the frame structure is required to determine the reaction forces at the pin joints, assuming that the pulleys are frictionless.
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A coplanar force system refers to a set of forces that all lie in the same plane and are subject to different reactions between the point of contact and the supports. Understanding how different types of supports affect coplanar forces is crucial for designing safe and reliable structures that can withstand external loads.
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Consider a hydraulic hoist supporting a load of 1 kN. Assuming a simplified schematic representation of this frame structure, the force acting on BD and BF members can be determined.
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Stability at the half pin-frame interface on external fixation constructs.

Alexios Dimitrios Iliadis1, Parag Kumar Jaiswal2, Jay Meswania3

  • 1Limb Reconstruction Unit, Royal National Orthopaedic Hospital NHS, Brockley Hill, Stanmore, Middlesex, HA7 4LP, UK. alexiliadis@mail.com.

Strategies in Trauma and Limb Reconstruction
|October 15, 2016
PubMed
Summary
This summary is machine-generated.

Bolt screws provide superior stability for external fixation half pins compared to grub screws, requiring higher torque and load to loosen. This reduces failure at the head-driver interface in orthopedic fixation devices.

Keywords:
Bolt screwsExternal fixation constructsGrub screwsHalf pin–frame interfaceStability

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Area of Science:

  • Orthopedic biomechanics
  • Biomaterials and mechanical testing
  • Surgical fixation devices

Background:

  • External fixation is crucial for treating complex fractures and bone deformities.
  • The interface between half pins and fixation frames is a critical point for construct stability.
  • Grub screws and bolt screws are commonly used to secure these interfaces, but their comparative mechanical performance is not fully elucidated.

Purpose of the Study:

  • To compare the mechanical performance of grub screws versus bolt screws in securing half pins to circular external fixation frames.
  • To evaluate loosening torques, axial loading thresholds for loosening, and failure modes under controlled conditions.

Main Methods:

  • A four-part experimental study was conducted using Taylor Spatial frames and Rancho cubes.
  • Loosening torques were measured with a calibrated torque wrench.
  • Axial loading was applied using a universal testing machine (UTM) to determine loosening thresholds and failure points.

Main Results:

  • Bolt screws required significantly higher torque for initial securing compared to grub screws.
  • Under uncontrolled applied torque, bolt screw constructs demonstrated a higher axial load threshold for loosening.
  • The torque required for head-driver interface failure was substantially higher for bolt screws (9.9 Nm) than grub screws (5.3 Nm).

Conclusions:

  • Bolt screws offer superior mechanical stability for securing half pins in external fixation constructs.
  • The use of bolt screws can enhance construct rigidity and reduce the incidence of failure at the half pin-frame interface.
  • Further in vivo research is warranted to validate these findings in a clinical setting.