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Multiaxial Fatigue Energy and Critical Plane Models

Multiaxial Fatigue Energy and Critical Plane Models. Reporter : Liang Haoqiong Teacher: Chen Gang. About elastic work, plastic work and total work. With plastic work, with cycle hardening. With cycle hardening, with damage. Morrow law .

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Multiaxial Fatigue Energy and Critical Plane Models

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  1. Multiaxial Fatigue Energy and Critical Plane Models Reporter : Liang Haoqiong Teacher: Chen Gang

  2. About elastic work, plastic work and total work With plastic work, with cycle hardening. With cycle hardening, with damage. Morrow law

  3. Elastic work also contributes the cycle damage Then , Ellyin law Just like Mason-Coffin law

  4. Successful modes, not only for fatigue life, but also dominant failure plane! Different material, different failure mode Normal stress dominate and shear stress dominate

  5. uniaxial multiaxial

  6. Chen X: For normal stress dominate material: For shear stress dominate material: 1 Stress(Strain) history 2 Dominate normal/shear stress(strain) plane use Mohr’ law 3 Normal stress(strain) range on dominate shear stress(strain) plane Shear stress(strain) range on dominate normal stress(strain) plane We always deal with shear stress dominate material.

  7. Base on max shear stress(strain) range and normal stress(strain) range on this critical plane, then: Brown and Miller: Shang DG: Fatemi and Socie (addition hardening): Smith, Watson and Topper (SWT):

  8. Next time, about Nonproportionalmultiaxial loading... Thanks!

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