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Fatigue Life Estimate of the Horn & Concept of the Mechanical Horn Support System

This talk outlines the basis of fatigue analysis and provides a fatigue estimation for the EUROnu horn. It also presents the general concept of the support system and discusses the assumptions used for support system calculations. The analysis results and conclusions are discussed, along with some additional remarks about the limitations of the analysis.

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Fatigue Life Estimate of the Horn & Concept of the Mechanical Horn Support System

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  1. APPROACH TO FATIGUE LIFE ESTIMATE OF THE HORN & CONCEPT OF THE MECHANICAL HORN SUPPORT SYSTEM Cracow University of Technology Institute of Applied Mechanics M.Kozień & A.Wróblewski EUROnu Project

  2. Outline of the talk • Basis of the fatigue analysis • Fatigue estimation for EUROnu horn • General concept of the support system • Assumption of the support system calcullations • Results of the analysis • Conclusions

  3. Fatigue analysis / description of time stress history / Description of harmonically varied stress history – definition of basic parameters

  4. Fatigue analysis / different problems / • Harmonic vs. random analysis • Non - symmetric cycles • Multiaxial stress • Static and dynamic stress • Cumulative damage • Experimantally datas • Scale effect, notch effect, corrosion, fretting, radiation etc.

  5. Fatigue analysis / S-N curve / „Infinite large” number of cycles, fatigue limit - stress for N = 108 or N = 5·108

  6. Fatigue analysis / equivalent completely revesed uniaxial stress / Approach suggested by Morrow, Goodman hyphothesis

  7. Fatigue analysis / effective stress amplitude / Approach based on Von Mises equivalent stress

  8. Fatigue analysis / effective mean stress / Sines stress Hydrostatic stress

  9. Fatigue analysis / Crossland criterion /

  10. (x10**3) 8000 (x10**3) 7200 8000 6400 7200 5600 VON MISES STRESS (Pa) 6400 4800 5600 4000 4800 3200 VON MISES STRESS (Pa) 4000 2400 3200 1600 2400 800 1600 (x10**-2) 0 0 .4 .8 1.2 1.6 2 800 .2 .6 1 1.4 1.8 0 TIME (s) (x10**-2) 0 .4 .8 1.2 1.6 2 .2 .6 1 1.4 1.8 TIME (s) Fatigue estimation for EUROnu horn – stress due to a single heat from second. particles

  11. Fatigue estimation for EUROnu horn – results of analyses

  12. Support system – general concept

  13. Support system – assumed mass Water 7.7 kg Horn 110.0 kg Reflector 55.3 kg Electrical equipment ?? (assumed) 50.0 kg Total 223.0 kg

  14. Support system – displacements

  15. Support system – von Mises stress

  16. Final remarks and conclusions • The fatigue analysis did not account for the corrosion and radiation effects. This effects can have an important role in the final conlusions. • The model of evolution of material damage due to radiation is being tested in Cracow. • The fatigue analysis strongly depends on geometrical details that will be determined during design stage. • The stresses used did not include heating due to target. • The stress levels calcullated so far are within the fatigue stress limit. • The design of the support is still in progress.

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