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Related Concept Videos

Fatigue01:21

Fatigue

309
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...
309
Fatigue Strength of Concrete01:22

Fatigue Strength of Concrete

346
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...
346
Bending of Members Made of Several Materials01:08

Bending of Members Made of Several Materials

348
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.
Hooke's Law determines stress in each material, stating that stress is proportional to strain but varies due to each...
348
Yield Criteria for Ductile Materials under Plane Stress01:25

Yield Criteria for Ductile Materials under Plane Stress

271
In designing structural elements and machine parts using ductile materials, it is crucial to ensure that these components withstand applied stresses without yielding. Yielding is initially determined through a tensile test, which evaluates the material's response to uniaxial stress. However, tensile stress is insufficient when components face biaxial or plane stress conditions This condition requires advanced criteria to predict failure.
The Maximum Shearing Stress Criterion, also known as...
271
Design Consideration01:22

Design Consideration

382
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...
382
Shear and Bending Moment Diagram: Problem Solving01:24

Shear and Bending Moment Diagram: Problem Solving

2.3K
When analyzing a beam supporting concentrated loads and a distributed load, drawing the shear and bending moment diagrams is essential. These diagrams help understand the internal forces and moments acting on the beam, which is crucial for designing safe and efficient structures. Follow these steps to create the shear and bending moment diagrams:
Draw a Free-Body Diagram: Start by drawing a free-body diagram of the entire beam, including the concentrated loads, distributed load, and reaction...
2.3K

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Related Experiment Video

Updated: Oct 30, 2025

Cutting Procedures, Tensile Testing, and Ageing of Flexible Unidirectional Composite Laminates
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A Robust Numerical Methodology for Fatigue Damage Evolution Simulation in Composites.

Angela Russo1, Andrea Sellitto1, Prisco Curatolo1

  • 1Department of Engineering, University of Campania "L. Vanvitelli", Via Roma 29, 81031 Aversa, Italy.

Materials (Basel, Switzerland)
|July 2, 2021
PubMed
Summary

A new Smart Cycle strategy significantly reduces computational costs for simulating fatigue in carbon fiber composites. This method efficiently predicts critical damage points, saving time and resources in material analysis.

Keywords:
fatigueopen-hole specimenresidual stiffness cycle jump strategyresidual strength

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Computational Mechanics

Background:

  • Composite materials, particularly carbon fiber-reinforced polymers (CFRPs), are susceptible to fatigue, a primary cause of component failure.
  • Simulating fatigue in CFRPs is computationally intensive due to the need for numerous static analyses to model damage propagation.
  • Existing models require extensive computation, hindering rapid assessment of material behavior under cyclic loading.

Purpose of the Study:

  • To introduce a novel 'Smart Cycle' strategy to optimize numerical simulations of fatigue in CFRPs.
  • To reduce the computational burden associated with simulating fatigue-induced degradation.
  • To enhance existing empirical models for predicting strength and stiffness degradation.

Main Methods:

  • Implementation of the 'Smart Cycle' strategy within the ANSYS MECHANICAL finite element code using APDL.
  • The strategy bypasses simulation of every load cycle, focusing only on cycles with significant damage progression.
  • Validation involved simulating unidirectional coupons under tensile-tensile fatigue and comparing results with experimental data.

Main Results:

  • The Smart Cycle strategy effectively predicts fatigue failure points, reducing computational effort.
  • Numerical results for unidirectional coupons showed good agreement with literature experimental data.
  • The approach was further tested on a cross-ply open-hole composite panel, demonstrating its potential for complex structures.

Conclusions:

  • The Smart Cycle strategy offers a computationally efficient method for assessing fatigue behavior in CFRPs.
  • This approach can accelerate the design and analysis process for composite components.
  • The validated strategy shows promise for investigating fatigue in more complex composite structures and loading scenarios.