3 Replies Latest reply on May 3, 2007 7:17 PM by Vince Adams

    Strain gauge feature....????

    Designer Designer
      Hi All....

      In the real life, sometimes we use STRAIN GAUGE to check the strain at a location.
      In X,Y,Z direction. I heard that NASTRAN have a feature called Strain Gauge. With that feature, we can input strain or stress base on real measure using STRAIN GAUGE at a specific location in our 3D Model.

      Any information, Is cosmos have a feature like that ?

      Thank`s

      -DD
        • Strain gauge feature....????
          genexxer genexxer
          Is another way of stating the question "Can one make strain a boundary condition?" If so, I don't think so. But I have to really think about it. I know geostar has some features that remind me of this but not in this solver.
          • Strain gauge feature....????
            genexxer genexxer
            Also remember that for hyperelastic materials like elastomers, one can use nonlinear material properties and therein supply stretch-strain curves for biaxial, planar and triaxial specimen tests.
            • Strain gauge feature....????
              Vince Adams
              I'd be REALLY careful pursuing this approach. I tried it with displacements on a flat plate 20 years ago with reasonable results because the system sought equilibrium based on those enforced locations. A customer of mine tried it with thermocouple data in a static analysis with horrible results. A static analysis will not find the thermal equilibrium based on local temps. With applied strains, you are somewhere in the middle of these and I wouldn't necessarily expect a unique solution from local strain input.
              I don't recall a "strain gage" in all my years of using Nastran (although its been a couple) My guess though is this isn't a BC but a Sensor of sorts to report local strains.
              Your best bet is to make your best BC estimates and adjust within reasons until your strains match. There's a COSMOS Companion with some tips for doing this in the archive at www.solidworks.com/Companion