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  • Users: wnmascare
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  1. wnmascare

    Fatigue Analysis of Bolted Joints

    Hi everyone! I'm trying to run a high cycle fatigue analysis of a bolted flange submitted to bolt preload and a bending moment varying harmonically. The objective is to analyze only the flange, not the bolts. The first load step is the preload and the second is the application of a bending...
  2. wnmascare

    Weak Formulation for FEM

    Hi everyone I've been trying to understand a little of the mathematics behind FEM and I got stuck in the definition of the weak (or variational) form. All literatures I have researched so far, they just say that we should multiply the differential equation by a trial function w, integrate over...
  3. wnmascare

    VDI 2230 - Substitutional Line of Action of the Axial Force

    Hi everyone! VDI 2230 states that there are two kinds of loading joints: concentric and eccentric. For the case of eccentric loading joints, the variable "a" (the substitutional line of action of the axial working load) must be determined. According to section 5.2.1, the variable "a" is...
  4. wnmascare

    VDI 2230 - Eccentrically Loaded Joints

    Hi everyone! According to VDI 2230, there are two kinds of loading joints: concentric and eccentric. For the case of eccentric loading joints, the variable "a" (the substitutional line of action of the axial working load) must be determined. According to section 5.2.1, the variable "a" is...
  5. wnmascare

    Elastoplastic Data Set From Stress-Strain Curve

    Hi everyone. I got the real stress-strain curve illustrated in the attached figure for AISI 1045 steel and I need to get the data set for an elastoplastic analysis in Abaqus, i.e., I need to get the data pairs true stress-true plastic strain. You can observe that the curve deviates from ideal...
  6. wnmascare

    Mean Stress Correction - Alternative Criteria

    Hi everyone! These days, I was reading a paper written by Prof. Norman Dowling on mean stress effect on fatigue life, whose title is “Mean Stress Effect in Stress-Life and Strain-Life Fatigue”. This paper and his book on mechanics of materials demonstrate that Goodman, Gerber and Soderberg mean...
  7. wnmascare

    Elastoplastic Analysis of an Offshore Component

    Hi everyone! I was running an elastoplastic analysis of an offshore component with three different mesh refinements in Abaqus. The attached figure illustrates the meshes and the distribution of the equivalent plastic strain (PEEQ) for each mesh. A steel cable will tied in the hole and a force...
  8. wnmascare

    Modeling Stress Concentrations with FEM

    Hi everyone! I was modeling a stress concentration feature and I was warned that FEM is not the best tool to do that. Then, I was reading Cook´s book (Cook, R. D.; Malkus, D. S.; Plesha, M. E.; Witt, R. J. Concepts and Applications of Finite Element Analysis) and they said exactly this: "FEA is...
  9. wnmascare

    Hyperelastic Material Correlation

    Hi everyone! I'm going to perform a structural analysis of na offshore componente called bend stiffener. It is made of polyurethane and it undergoes large elastic deformation. In this case, I need to use a hyperelastic model. I have the simple tensile test data for the polyurethane. In order...
  10. wnmascare

    Elastoplastic Analysis of an Offshore Component

    Hi Everyone! I performed a simple elastoplastic analysis on an offshore component on Abaqus. Then, when I plotted the equivalent plastic strain (PEEQ), I observed that the maximum PEEQ took place in a region different from the maximum von Mises stress. How is it possible? Have you faced a...

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