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Recent content by mattis

  1. mattis

    Looking for a Highly Fatigue Resistance Spring Material

    About shot peening, I know realize that you have quite thin material. In my line of work 0,4 mm would be considered as foil... got confused by the imperial measures. Maybe try glass bead blasting which will give you residual stresses but not deform the surface too much. Residual stresses will...
  2. mattis

    Looking for a Highly Fatigue Resistance Spring Material

    continuing on the paranthesis in the previous post. Surface condition is extremly important here do not forget to shot peen the spring to make sure you have negative compressive stresses in the surface. good luck
  3. mattis

    show minor unit and minor grid on log log chart

    By accident i found a GNU program that could do what I´ve always wanted Excel to do, RLplot (http://rlplot.sourceforge.net/)can do nice looking plots with log-log scale with major units of 10,20,30 and minor ticks at 11,12 etc. and many other things. The program for windows is a single binary...
  4. mattis

    show minor unit and minor grid on log log chart

    I don´t have any solution and I´ve tried many of the other plot programs on the market and only ORIGIN can do a half decent plot with a logritmic axis where the scale is say 40 to 70 with labels for 40, 50 , 60 and 70... This is very annoying especially when dealing with e.g. fatigu e data. You...
  5. mattis

    What is the trap in excel Chart Trendline(Regression)?

    You can get strange numbers from the curve fit if you do a trendline when one or both axis are in a logarithmic scale. //nisse
  6. mattis

    Who 'Invented' Metric

    one cubic centimeter of water@4°C =0.99997 g Water has the highest density @4°C... to be picky.
  7. mattis

    Cast iron in ABAQUS

    Thanks for replying MToft. After thinking about my problem for a while I´ve found that I don´t need to model this behaviour at the moment. As usual if you let a few days pass you´ll cool down and go back to reality.... My experience based on my companys data from grey Iron (tons and tons of...
  8. mattis

    Cast iron in ABAQUS

    Is there anyone that has experiences of modelling cast iron (grey Iron) in ABAQUS. I´m thinking of the phenomena with different elastic plastic behaviour in compression and tension. ?
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