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Related Concept Videos

Fatigue01:21

Fatigue

801
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...
801
Design Consideration01:22

Design Consideration

547
Designing a structure involves a series of considerations, primarily the material's ultimate strength, calculated through tests that measure changes under increased force until the material reaches its breaking point or limit. The ultimate load, where the material breaks, is divided by its original cross-sectional area, resulting in the ultimate normal stress or strength. The ultimate shearing stress is another significant factor taken into account.
The factor of safety is another key...
547
Deformation of Member under Multiple Loadings01:11

Deformation of Member under Multiple Loadings

445
When a rod is made of different materials or has various cross-sections, it must be divided into parts that meet the necessary conditions for determining the deformation. These parts are each characterized by their internal force, cross-sectional area, length, and modulus of elasticity. These parameters are then used to compute the deformation of the entire rod.
In the case of a member with a variable cross-section, the strain is not constant but depends on the position. The deformation of an...
445
Stresses under Combined Loadings01:23

Stresses under Combined Loadings

457
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...
457
Fatigue Strength of Concrete01:22

Fatigue Strength of Concrete

544
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...
544
Impact Loading01:19

Impact Loading

664
Impact loading occurs when a moving object collides with a stationary structure, such as a rod with a uniform cross-sectional area fixed at one end. Under these conditions, the rod absorbs the kinetic energy from the striking object, leading to deformation and subsequent stress development. As the rod returns to its original position and reaches maximum stress, the absorbed energy, initially manifested as kinetic energy, transforms entirely into strain energy.
In cases of elastic deformation,...
664

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Related Experiment Video

Updated: Jan 18, 2026

Subject-specific Musculoskeletal Model for Studying Bone Strain During Dynamic Motion
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A Multi-Level Nonlinear Cumulative Fatigue Damage Life Prediction Model Considering Load Loading Effects.

Bowen Yang1, Junzhou Huo2

  • 1School of Mechanical Engineering, Shenyang University of Technology, Shenyang 110870, China.

Materials (Basel, Switzerland)
|September 13, 2025
PubMed
Summary
This summary is machine-generated.

This study introduces a new nonlinear fatigue damage accumulation model to predict material fatigue life under cyclic loads. The model enhances prediction accuracy for critical equipment, showing superior performance compared to existing methods.

Keywords:
Manson-Halford modelfatigue damageload ratiomulti-level loading

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Reliability Engineering

Background:

  • Fatigue damage failure involves continuous degradation of material properties under cyclic loads.
  • Cumulative fatigue damage analysis is crucial for the structural integrity of major equipment.
  • Understanding the influence of load order in mixed cyclic loading is essential for accurate fatigue life prediction.

Purpose of the Study:

  • To develop a novel nonlinear fatigue damage accumulation model.
  • To enhance the prediction accuracy of fatigue life under mixed cyclic loading.
  • To introduce a fatigue damage accumulation influencing factor (Dcr) for improved model performance.

Main Methods:

  • Investigated the mechanism of fatigue damage evolution.
  • Applied Manson-Halford nonlinear fatigue damage accumulation theory.
  • Utilized the mechanism of relative cumulative damage.
  • Introduced a fatigue damage accumulation influencing factor (Dcr).
  • Validated the new model using multi-level fatigue load data.

Main Results:

  • The proposed nonlinear damage accumulation model demonstrated superior fatigue life prediction accuracy.
  • The model achieved an error precision generally between 10% and 20%.
  • The improved method exhibited enhanced stability while maintaining high prediction accuracy.

Conclusions:

  • The developed nonlinear damage accumulation model is effective and accurate for predicting fatigue life.
  • The introduction of the Dcr factor significantly improves prediction precision.
  • The model offers a reliable approach for assessing the fatigue performance of materials under complex loading conditions.