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  1. jdps

    Neuber Correction Method

    My understanding of Neuber's Correction/Method is that it allows for the estimation of nonlinear stresses from the corresponding linear elastic stresses by equating strain energy. I've recently been doing a little more research into the topic and would like some help understanding. From reading...
  2. jdps

    Neuber Method Applicability and Questions

    Thank you for the quick response. When answering my first question, you stated the following, "I would bother with localised plasticity in static analysis. Static analysis (for me) is about gross section stress." I am guessing you meant wouldn't "I wouldn't bother...". I agree with static...
  3. jdps

    Neuber Method Applicability and Questions

    I've been looking into the applicability of the Neuber Method/Correction for reducing elastic stress values in static analysis. I believe I have a pretty good grasp of the concept but have some question, - Many of the online resources seem to apply this method when dealing with cyclic/fatigue...
  4. jdps

    Stress Concentration Factors and FEM

    "Would it be theoretically correct for me to take the stress at stress concentrator locations and divide by the stress concentration factor?" … why ? for what purpose ? Say I have a fitting with complex geometry and complex loading, I am trying to determine if there is a valid method to...
  5. jdps

    Stress Concentration Factors and FEM

    I have been playing around with the idea of deriving stress concentration factors from finite element models and have some questions. I have a simple model of a plate with a hole with an axial load applied. As I refine the mesh near the hole, the stress concentration factor I derive from my...
  6. jdps

    FEMAP Buckling Analysis Help

    I just recently started doing buckling analysis on FEMAP and have a few basic question: - From research I have done, it seems that if my shell elements have offsets, I have to use CQUADR elements for buckling analysis. Is this true? Why is this the case? Why are CQUAD4 elements not viable? -...
  7. jdps

    Fastener Margin Checks

    Thank you both for the responses. Just to make sure I'm understanding, material properties are not used as they do not account for stress concentrations and other potential interactions. Therefore, when doing fastener checks, I should find the corresponding fastener in MMPDS and obtain the...
  8. jdps

    Fastener Margin Checks

    I was just introduced to fastener margin checks and have some basic questions on the topic. From research, I've been doing fastener analysis through the following interaction equation: MS = 1/(((Rt+Rb)^2 + Rs^2)^.5) - 1 where Rt = F_pullthru/Ptu Rb = bending (somewhat involved process...

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