looking for "simple" plate design software
looking for "simple" plate design software
(OP)
Sometime ago I found some software that checked deflection and bending stress in rectangular plates. Cannot find it now and so need to know if there is still such an animal out there ?
Requirmeents are for either 4 or 2 edge support, UDL, concentrated AND "line load" to calculate max bending stress and deflection. Application is calculating glass thicknesses for various panel sizes.
Most of the "simple" design software does not include line loads. Formula for spreadsheet OR suitable software will do
Regards
Logikman
Requirmeents are for either 4 or 2 edge support, UDL, concentrated AND "line load" to calculate max bending stress and deflection. Application is calculating glass thicknesses for various panel sizes.
Most of the "simple" design software does not include line loads. Formula for spreadsheet OR suitable software will do
Regards
Logikman






RE: looking for "simple" plate design software
You could write your own spread sheet from the formulas in Roarke's Stress and Strain.
Try www.xcalcs.com, I think they have a calc sheet for the plate loading your are considering.
I do have some concern about the glass issue, I don't think it has a typical stress-strain curve and is not an elastic material. Be careful of brittle failure before you reach your calculated defection. I would double check the elastic issue in a materials science general text.
RE: looking for "simple" plate design software
This distribution is based on sample testing of representative samples with representative loading and the spread of failure strenghts is then scaled to match the actual component being analysed. This scaling takes into account the fact that a larger area has potentially more flaws therefore will fail at lower loading.
Much info is available on the web on this subject but a good reference is 'Materials for Infrared Windows and Domes, Propertied and Performance' by Daniel C. Harris, ISBN 0819434825.
Good Luck!!
RE: looking for "simple" plate design software
re: RG88's thoughts - the glass is always either toughended or laminated so it tend to act very much like a sheet of metal.Indeed it can be defelcted quite some way before it fails. eg: a 2700 x 1000 x 12mm panel in toughened glass can deflect up to 30mm with a 500N load.
I tried the xcalcs site but could not access the relevent area for some reason.
Anyway thanks for your info
re: scotland6
Thanks agian I will look up "weibull"on the web.
Ps
I still have not tracked the software I found last year so if anyone knows of anything like it please let me know.
RE: looking for "simple" plate design software
You can keep on looking but you can't find anything simpler than the tables and formulas in the book of "Formulas in Roarke's Stress and Strain". RG88's suggestion is to program the formulas to get additional information if needed (e.g. moments and deflection of interior points etc). There is another book by Szilard on bending of plates and tables there could be easier to read.
I always use them to do sanity checks on my computer analyses.
RE: looking for "simple" plate design software
RE: looking for "simple" plate design software
*US Dept Interior/Bureau of Reclamation Engineering Nomograph No. 27. Its quite useful.
RE: looking for "simple" plate design software
Is there more information in this publication than is shown in Roarks Formulas????
Does this publication deal with large deflection analysis???
RE: looking for "simple" plate design software
RE: looking for "simple" plate design software
http://www.mdsolids.com/
I dowloaded version 1.5 in 1999, and the trial demo still hasn't expired. They are now in ver. 2.6 but I am unsure if the new demo actually stops working after the specified time period.
Flores
RE: looking for "simple" plate design software
It called Analysis Group and is available as a trial download at www.iesweb.com.
The only problem that it does not seem to handle is lin-loads" but most other loading conditions are covered.