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  1. Modey003

    How does a FEM program know when a pipe buckles?

    Just to ellaborate on what gwolf and rob768 said. There are two ways that buckling can be predicted in FEA. One method stated by rob768 is a buckling criterion. During postprossing you can have the program plot contours to see if the buckling criterion has been exceed in a given region. But...
  2. Modey003

    von Mises or principle stress for fatigue analysis?

    My whole point is that microscopic level there can be plastic yeilding depending on the material. I have even seen this mechanism in plastics (which von mises is also a good criterion) and soft metals. The failure criterion depends on many factors: material, loading conditions, and...
  3. Modey003

    Welds in FEM

    When FEA modeling a weld I would definatly start with a homogeneous contiuum model since the stiffness of the weld joint isn't significantly effected by weld quality (pores, intergranular oxide/sulfur inclusions etc...). Also, you will need to account for any thermal-mechanical residal stresses...
  4. Modey003

    von Mises or principle stress for fatigue analysis?

    Most fatigue data are gathered using uniaxial loading. The stress amplitude you are plotting is the stress amplitude along the uniaxial direction. This is your principal direction. I imagine the von mises stress could be a concern for ductile materials during cyclical loading. For instance...
  5. Modey003

    Microstructural Mechanical Modeling Using FEA

    I'm interesting in getting into computational Materials Science. I know a lot of FEA books assume a homogeneous material. I am familiar with FEA basics. Does anybody know of a book that focuses on microstructural mechanical modeling using FEA? I imagine a good start would be to use mesh elements...
  6. Modey003

    Crevice Corrosion Caused by a Oil Film ?

    Just got word back from the customer. Vegitable oil was used during the deep drawing of the parts. 15:1 of water to mineral oil was used during their stripping process. The parts were shipped with the vegitable oil coating the parts. Now we are in the process of trying to get them to either...
  7. Modey003

    Crevice Corrosion Caused by a Oil Film ?

    My company is in CT and its been very humid lately. I work as a materials/electrochemical engineer for an electroplating company. We do a lot of R&D work, but to bring in the money we have to resort to our core competency, which is conventional plating. Here is the reason why I asked my...
  8. Modey003

    Crevice Corrosion Caused by a Oil Film ?

    Hello, Has anybody encountered crevice corrosion caused by moisture trapped underneath a oil film? I imagine it could be possible since the oil would trap the moisture and provide a diffusion barrier for oxygen. Anyone have any input? Thanks Modey

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