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Related Concept Videos

Fatigue01:21

Fatigue

268
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...
268
Microcracking in Concrete01:20

Microcracking in Concrete

225
Microcracking in concrete refers to the tiny cracks that can form within the material even before any external load is applied. These microcracks typically occur at the interface between the coarse aggregate and the hydrated cement paste, often as a result of differential volume changes prompted by variations in stress-strain behavior, as well as thermal and moisture movement. Initially, these microcracks remain stable and do not grow substantially until the concrete is stressed to about 30...
225
Fatigue Strength of Concrete01:22

Fatigue Strength of Concrete

309
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...
309
Elastic Strain Energy for Shearing Stresses01:20

Elastic Strain Energy for Shearing Stresses

311
As discussed in previous lessons, strain energy in a material is the energy stored when it is elastically deformed, a concept crucial in materials science and mechanical engineering. This energy results from the internal work done against the cohesive forces within the material. When a material undergoes shearing stress and corresponding shearing strain, the strain energy density, which is the energy stored per unit volume, is calculated. Within the elastic limit, where the stress is...
311
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

341
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.
341
Thin-Walled Hollow Shafts01:15

Thin-Walled Hollow Shafts

272
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...
272

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Related Experiment Video

Updated: Sep 28, 2025

Full-field Strain Measurements for Microstructurally Small Fatigue Crack Propagation Using Digital Image Correlation Method
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Full-field Strain Measurements for Microstructurally Small Fatigue Crack Propagation Using Digital Image Correlation Method

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Advanced numerical simulations considering crack orientation for fatigue damage quantification using nonlinear guided

Yu Fung Lee1, Ye Lu1

  • 1Department of Civil Engineering, Monash University, Clayton, VIC 3800, Australia.

Ultrasonics
|March 31, 2022
PubMed
Summary
This summary is machine-generated.

This study advances fatigue crack detection using advanced simulations that precisely model crack trajectories. The enhanced numerical approach improves the accuracy of nonlinear ultrasonic wave analysis for damage assessment.

Keywords:
Advanced numerical simulationContact acoustic nonlinearityFatigue crackNonlinear guided waves

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Non-Destructive Testing

Background:

  • Fatigue cracks significantly impact structural integrity.
  • Accurate modeling of crack propagation is crucial for reliable damage assessment.
  • Nonlinear ultrasonic (NLU) methods show promise for detecting and quantifying fatigue damage.

Purpose of the Study:

  • To develop and validate an advanced numerical simulation for fatigue crack trajectory.
  • To utilize the precise crack trajectory for simulating nonlinear ultrasonic wave interactions.
  • To enhance the capability of numerical modeling for fatigue damage detection.

Main Methods:

  • Separating Morphing and Adaptive Remeshing Technology (SMART) Crack Growth in ANSYS for fatigue crack simulation.
  • Validation of simulated crack trajectory against experimental data (initiation angle, fatigue cycles).
  • Application of the second harmonic method for crack quantification using simulated nonlinear ultrasonic waves.

Main Results:

  • The advanced simulation, incorporating a precise fatigue crack trajectory, yielded nonlinearity trends closer to experimental results compared to a straight-line crack model.
  • The simulation accurately predicted crack initiation angle and fatigue cycles.
  • Consideration of crack orientation in contact acoustic nonlinearity (CAN) improved simulation fidelity.

Conclusions:

  • The developed numerical approach enhances the simulation of nonlinear guided wave-fatigue crack interactions.
  • This method provides a more accurate tool for fatigue damage assessment and NLU analysis.
  • The study facilitates fundamental investigations into the contact acoustic nonlinearity mechanism.