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Related Concept Videos

Thin-Walled Hollow Shafts01:15

Thin-Walled Hollow Shafts

329
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...
329
Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity01:15

Relation between Poisson's ratio, Modulus of Elasticity and Modulus of Rigidity

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Deformation occurs in axial and transverse directions when an axial load is applied to a slender bar. This deformation impacts the cubic element within the bar, transforming it into either a rectangular parallelepiped or a rhombus, contingent on its orientation. This transformation process induces shearing strain. Axial loading elicits both shearing and normal strains. Applying an axial load instigates equal normal and shearing stresses on elements oriented at a 45° angle to the load axis.
383
Circular Shafts - Elastoplastic Materials01:24

Circular Shafts - Elastoplastic Materials

257
The study of solid circular shafts under stress shows that within the elastic limit, stress increases directly to the distance from the shaft's center. This relationship holds until the shaft reaches a critical point of stress, beyond which it begins to yield, marking the transition from elastic to plastic deformation. At this crucial juncture, the maximum torque the shaft can endure without permanent deformation is determined, signifying the limit of its elastic behavior.
As torque on the...
257
Plastic Deformation in Circular Shafts01:20

Plastic Deformation in Circular Shafts

321
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...
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Stress Concentrations in Circular Shafts01:18

Stress Concentrations in Circular Shafts

317
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...
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Bending of Members Made of Several Materials01:08

Bending of Members Made of Several Materials

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In analyzing a structural member composed of two different materials with identical cross-sectional areas, it is crucial to understand how their distinct elastic properties affect the member's response under load. The analysis involves assessing stress and strain distributions using the transformed section concept, which accounts for variations in material properties.
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Related Experiment Video

Updated: Nov 2, 2025

Cortical Bone Assessment Using Ultrasonic Guided Waves: A Reproducibility Study in a Healthy Population
09:02

Cortical Bone Assessment Using Ultrasonic Guided Waves: A Reproducibility Study in a Healthy Population

Published on: January 31, 2025

939

Cortical Thickness, Bone Density, and the Insertion Torque/Depth Integral: A Study Using Polyurethane Foam Blocks.

Danilo Alessio Di Stefano, Adriano Piattelli, Giovanna Iezzi

    The International Journal of Oral & Maxillofacial Implants
    |June 11, 2021
    PubMed
    Summary
    This summary is machine-generated.

    The integral of the instantaneous torque-depth curve (I) better detects changes in implant stability related to cortical bone thickness than insertion torque. This may improve predictability in implant rehabilitation outcomes.

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    Area of Science:

    • Biomaterials Science
    • Dental Implantology
    • Surgical Engineering

    Background:

    • Dental implant primary stability is crucial for successful osseointegration.
    • Accurate assessment of bone density and implant stability is essential for predictable surgical outcomes.
    • Novel parameters, including insertion torque and the integral of the torque-depth curve (I), have been proposed to quantify bone-implant interaction.

    Purpose of the Study:

    • To evaluate the influence of cortical bone presence and thickness on two bone density and implant primary stability parameters: average instantaneous probing torque and the integral of the instantaneous torque-depth curve at implant insertion (I).

    Main Methods:

    • Polyurethane foam blocks mimicking various cortical/cancellous bone densities were used.
    • Instantaneous torque measurements were taken during probe insertion and implant insertion.
    • Insertion torque and the integral (I) were recorded for implants placed in blocks with varying cortical thicknesses and preparation diameters.

    Main Results:

    • The average instantaneous probing torque differentiated five of six bone density classes.
    • Both insertion torque and the integral (I) increased proportionally with cortical bone thickness (r > 0.96).
    • The slope of the insertion torque-thickness plot was unaffected by minor changes in preparation diameter, unlike the integral (I) plot.

    Conclusions:

    • The integral of the instantaneous torque-depth curve (I) may be more sensitive than insertion torque in detecting changes in implant stability due to cortical bone variations.
    • These findings could enhance the predictability of implant and prosthetic rehabilitation outcomes.
    • Further research in diverse experimental settings is recommended to validate these results.