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Related Concept Videos

Stresses under Combined Loadings01:23

Stresses under Combined Loadings

When analyzing a bent tube with a circular cross-section subjected to multiple forces, it is crucial to determine the stress distribution in order to maintain structural integrity under varied load conditions.
The process begins by slicing the tube at critical points and analyzing the internal forces and stress components at these sections, focusing on the centroid. Normal stresses, generated by axial forces and bending moments, are either compressive or tensile and vary across the section from...
Stress Concentrations in Circular Shafts01:18

Stress Concentrations in Circular Shafts

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...
Stress: General Loading Conditions01:15

Stress: General Loading Conditions

To grasp the intricacy of real-world conditions where multiple loads are applied simultaneously to a structure, one might visualize a section passing through a specific point within a body, aligned parallel to the xy plane. This section is subjected to various forces, including original loads, normal forces, and shearing forces.
The shearing force, possessing potential directionality within the plane of the section, is simplified into two component forces running parallel to the x and y axes.
Transformation of Plane Stress01:18

Transformation of Plane Stress

Studying stress transformation is essential in understanding how stress components within a material, like a cube under plane stress, change with rotation. This change is analyzed by considering a prismatic element within the cube. As the element rotates, the stress components acting on it—both normal and shearing stresses—change in magnitude and orientation. This change is quantified using trigonometric functions of the rotation angle, relating the forces acting on the rotated element's faces...
Stress Concentrations01:13

Stress Concentrations

The concept of stress concentration is crucial for understanding how materials respond under bending stresses, particularly when there are irregularities or discontinuities in the material's geometry. Normally, stress in a symmetric member subjected to pure bending is assumed to be uniformly distributed across the entire cross-section. However, this assumption does not hold when there are variations in the cross-sectional geometry or the presence of notches and holes.
The stress concentration...
General State of Stress01:21

General State of Stress

The general state of stress within a material can be accurately depicted using a stress tensor. This tensor encapsulates the internal forces distributed within a material subjected to external forces or deformations.
Specifically, consider a tetrahedral element where one face, labeled XYZ, is perpendicular to the line OA, and the remaining faces align with the coordinate axes with point O as the origin. At any point, such as point O, the stress tensor can be used to determine the stress...

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Updated: Jun 29, 2026

A Coupled Experiment-finite Element Modeling Methodology for Assessing High Strain Rate Mechanical Response of Soft Biomaterials
11:28

A Coupled Experiment-finite Element Modeling Methodology for Assessing High Strain Rate Mechanical Response of Soft Biomaterials

Published on: May 18, 2015

Nonlinear stress analysis of titanium implants by finite element method.

Sakae Nagasawa1, Keigo Hayano, Tooru Niino

  • 1Department of Dental Materials, Matsumoto Dental University, Hirooka Shiojiri, Nagano 399-0781, Japan. snagasawa@po.mdu.ac.jp

Dental Materials Journal
|October 7, 2008
PubMed
Summary

Dental implant fractures are increasing. Finite element analysis revealed that even moderate forces can cause stress exceeding titanium

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An Improved Mechanical Testing Method to Assess Bone-implant Anchorage
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Last Updated: Jun 29, 2026

A Coupled Experiment-finite Element Modeling Methodology for Assessing High Strain Rate Mechanical Response of Soft Biomaterials
11:28

A Coupled Experiment-finite Element Modeling Methodology for Assessing High Strain Rate Mechanical Response of Soft Biomaterials

Published on: May 18, 2015

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09:35

Applying Dynamic Strain on Thin Oxide Films Immobilized on a Pseudoelastic Nickel-Titanium Alloy

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An Improved Mechanical Testing Method to Assess Bone-implant Anchorage
11:51

An Improved Mechanical Testing Method to Assess Bone-implant Anchorage

Published on: February 10, 2014

Area of Science:

  • Biomaterials Science
  • Dental Implantology
  • Mechanical Engineering

Background:

  • Dental implant use is increasing, leading to more reports of implant fractures.
  • Understanding the mechanical stresses within dental implants is crucial for preventing failure.

Purpose of the Study:

  • To investigate the stress distribution and potential failure modes in dental implants under various loading conditions using finite element analysis.
  • To evaluate the mechanical integrity of one-piece and two-piece dental implants.
  • To assess the risk of fracture when components from different manufacturers are combined.

Main Methods:

  • Finite element method (FEM) was employed for elasticity and plasticity analyses.
  • Simulations were conducted on one-piece and two-piece dental implant models.
  • Loading conditions simulated off-axis forces (500 N at 45 degrees) and vertical loading (5,000 N).

Main Results:

  • One-piece implants (3.3 mm diameter) experienced stress exceeding the proof stress of grade 4 pure titanium under simulated occlusal forces.
  • Plasticity analysis indicated a risk of screw area fracture in two-piece implants under similar off-axis loading.
  • Combining abutments and fixtures from different manufacturers predicted fracture even in high-strength titanium alloys like Ti-6Al-4V.

Conclusions:

  • Abnormal occlusal forces, such as those from bruxism, may lead to fatigue failure in one-piece dental implants.
  • The screw interface of two-piece implants is susceptible to fracture under specific loading conditions.
  • Incompatibility between components from different manufacturers poses a significant risk of dental implant failure.