Mechanical fatigue calculation
Simulating and predicting the lifespan of structures
Why carry out a mechanical fatigue calculation?
Mechanical fatigue in materials is a phenomenon of progressive degradation caused by cyclic stresses. It can lead to the appearance of cracks, their propagation and, ultimately, the failure of the structure. Mechanical fatigue analysis makes it possible to:
- Predict the service life of components subjected to repeated stresses.
- Optimise design to improve robustness and reliability.
- Identify critical areas susceptible to crack development.
- Ensure compliance with applicable standards and regulations.
- Reduce maintenance costs by implementing monitoring and preventive maintenance strategies.
Our mechanical fatigue calculation services
We support manufacturers with their structural fatigue issues through several specialised services:
- Numerical simulation of cyclic stresses and deformations.
- Analysis of the fatigue behaviour of metal, polymer and composite structures.
- Assessment of the service life of welds and assemblies under repeated stress.
- Optimisation of architectures to limit the risk of premature failure.
- Correlation between physical tests and numerical simulations to improve model reliability.
Examples of industrial applications
Automotive
Infrastructure
Energy
Defence
Aeronautics and space
Fatigue calculation approach and methodology
Identification of stress conditions
- Definition of load profiles (sinusoidal, DSP spectrum, random loads).
- Analysis of stress cycles and stress frequencies.
- Determination of material-specific damage criteria.
Modelling and simulation of fatigue phenomena
- Use of the finite element method (FEM) to simulate stresses.
- Calculation of megacyclic or olygocyclic fatigue (SN or EN method)
- Application of crack propagation laws (Paris law).
- Assessment of the influence of the environment (temperature, vibration, corrosion).
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Analysis of results and optimisation of designs
- Identification of critical areas at risk of cracking.
- Optimisation of thicknesses and geometries to reduce stress concentrations.
- Verification of compliance with fatigue life objectives.
Integrating fatigue calculations into product development
Our analyses enable us to anticipate risks related to structural fatigue and improve the robustness of equipment right from the design phase. Our experts assist you with:
- Analysis of regulatory and industrial requirements.
- Implementation of appropriate methodologies for numerical simulation.
- Design optimisation to improve reliability and service life.
Characterization of self-heating fatigue, a method under development at R&D Emitech
The Emitech Group is developing a new, innovative experimental fatigue characterization method for a wide range of materials, including materials with non-linear polymer behaviour.
Why choose the Emitech Group?
The Emitech Group combines expertise in numerical simulation and experimental validation to guarantee reliable lifetime predictions and optimise your designs.
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- Recognised expertise: several decades of experience in mechanical, vibration and structural fatigue testing.
- State-of-the-art numerical tools: finite element calculations, oligocyclic and megacyclic approaches, crack propagation.
- Test/simulation correlation: validation in our laboratories.
- Sector-specific support: solutions tailored to the constraints of the automotive, aerospace, rail, energy and defence industries.
Needs
Discover a selection of additional resources that explore topics related to this page including regulatory contexts, technical articles, and specific areas of expertise. These materials provide further insight to help you better understand the key challenges and available solutions.
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