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Related Concept Videos

Fatigue01:21

Fatigue

Fatigue occurs when materials rupture under repeated or fluctuating loads, even at stress levels far below their static breaking strength. It typically results in brittle failure, even for ductile materials. It is a critical consideration in designing machines and structural components subjected to repetitive or varying loads. The nature of these loadings can range from fluctuating loads like unbalanced pump impellers causing vibrations to repeatedly bending a thin steel rod wire back and forth...
Fatigue Strength of Concrete01:22

Fatigue Strength of Concrete

Fatigue, in the context of materials science and engineering, refers to the weakening or failure of a material caused by repeatedly applied loads, even if these loads are below the strength limit of the material. Fatigue strength in concrete is a critical property that influences its durability and longevity. Concrete can fail in two ways due to fatigue. Static fatigue or creep rupture occurs under a constant load or one that increases slowly. The other failure mode is due to cyclical or...
The Contractile Ring02:15

The Contractile Ring

Contractile rings are composed of microfilaments and are responsible for separating the daughter cells during cytokinesis. Contractile ring assembly proceeds along with other cell cycle events; however, very few mechanistic details are known about the timing and coordination of the contractile rings with the cell cycle.
A small GTPase, RhoA, controls the function and assembly of the contractile ring. RhoA belongs to the Ras superfamily of proteins. The activation of formins by RhoA promotes...
The Contractile Ring02:15

The Contractile Ring

Contractile rings are composed of microfilaments and are responsible for separating the daughter cells during cytokinesis. Contractile ring assembly proceeds along with other cell cycle events; however, very few mechanistic details are known about the timing and coordination of the contractile rings with the cell cycle.
A small GTPase, RhoA, controls the function and assembly of the contractile ring. RhoA belongs to the Ras superfamily of proteins. The activation of formins by RhoA promotes...
Transmission Shafts: Problem Solving01:09

Transmission Shafts: Problem Solving

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...
Design of Transmission Shafts - Stress Analysis01:15

Design of Transmission Shafts - Stress Analysis

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...

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Related Experiment Video

Updated: Jul 13, 2026

Crack Monitoring in Resonance Fatigue Testing of Welded Specimens Using Digital Image Correlation
05:30

Crack Monitoring in Resonance Fatigue Testing of Welded Specimens Using Digital Image Correlation

Published on: September 29, 2019

Fatigue failure of the GAP ring.

Gavan P Duffy1, Mary I O'Connor, Mark P Brodersen

  • 1Mayo Clinic, Jacksonville, Florida, USA.

The Journal of Arthroplasty
|August 11, 2007
PubMed
Summary

The Graft Augmentation Prosthesis ring showed early mechanical failures in hip arthroplasty, leading to implant revision in most patients. Researchers abandoned this device due to its high failure rate and allograft resorption.

Area of Science:

  • Orthopedic Surgery
  • Biomaterials Science
  • Implant Technology

Background:

  • Acetabular defects pose challenges in total hip arthroplasty.
  • Reconstruction of acetabular defects requires robust implant solutions.
  • Graft Augmentation Prosthesis (GAP) rings were evaluated for acetabular reconstruction.

Purpose of the Study:

  • To report the outcomes and identify early failures of the Graft Augmentation Prosthesis ring.
  • To assess the efficacy of the GAP ring in complex primary and revision hip arthroplasties.
  • To determine the mechanical integrity and longevity of the GAP ring.

Main Methods:

  • Seventeen consecutive Graft Augmentation Prosthesis rings were implanted.
  • The study included 7 complex primary and 10 revision hip arthroplasties.

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Ultrasonic Fatigue Testing in the Tension-Compression Mode
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Ultrasonic Fatigue Testing in the Tension-Compression Mode

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Scaling of Engineered Vascular Grafts Using 3D Printed Guides and the Ring Stacking Method
09:38

Scaling of Engineered Vascular Grafts Using 3D Printed Guides and the Ring Stacking Method

Published on: March 27, 2017

Related Experiment Videos

Last Updated: Jul 13, 2026

Crack Monitoring in Resonance Fatigue Testing of Welded Specimens Using Digital Image Correlation
05:30

Crack Monitoring in Resonance Fatigue Testing of Welded Specimens Using Digital Image Correlation

Published on: September 29, 2019

Ultrasonic Fatigue Testing in the Tension-Compression Mode
06:54

Ultrasonic Fatigue Testing in the Tension-Compression Mode

Published on: March 7, 2018

Scaling of Engineered Vascular Grafts Using 3D Printed Guides and the Ring Stacking Method
09:38

Scaling of Engineered Vascular Grafts Using 3D Printed Guides and the Ring Stacking Method

Published on: March 27, 2017

  • Follow-up data was collected to assess implant performance and patient outcomes.

    • Main Results:

    • Seven of 12 patients required revision surgery within an average of 5 years.
    • Five revisions were due to implant fatigue failure and allograft resorption.
    • Two revisions were performed for recurrent dislocations, indicating instability.

    Conclusions:

    • The Graft Augmentation Prosthesis ring demonstrated a high rate of early mechanical failure.
    • Allograft resorption and fatigue failure significantly impacted implant survival.
    • The device was abandoned due to its poor mechanical strength and performance in acetabular reconstruction.