On Tue, Jul 3, 2012 at 2:43 PM, Yigit Turgut wrote: > On Tue, Jul 3, 2012 at 2:26 PM, Vasile Surducan wrot= e: >> On Sun, Jul 1, 2012 at 6:14 PM, Yigit Turgut wrote: >>> On Sun, Jul 1, 2012 at 5:44 PM, Vasile Surducan wr= ote: >>>> Permittivity of a dielectric material can't be simulated (or it can >>>> but is mostly useless). >>> >>> That's not correct. How can one determine anisotropic permittivity >>> tensor of a heterogeneous material ? You can model your material and >>> expose to various electric fields and measure the response in almost >>> any computational electromagnetics platform. After a few iterations >>> you will reach a significant precision. >> >> Have you measured and compared the result with real life? > > Yes I did and it correlates very well. Nice, tell me please what software are you using for ? >> >> >>> >>>> It must be measured. >>> >>> You can't measure permittivity of gold or titanium for example, >> >> ... permittivity of conductors? > > Yes it exists and very high for gold. Example of gold was given > because it's very hard to process (to design a capacitor out of it). > Titanium doesn't include significant conductivity features but it's > very hard to process to build a capacitor. > >> >> if you >>> don't have very powerful high precision CNC. It highly depends on the >>> material thus I think 'measuring' can't be a generic method. >>> >>>> Permittivity is frequency and temperature dependent. You have to >>>> manufacture a capacitor from your dielectric and measure the capacity >>>> at the requested frequency and voltage. From those two values, knowing >>>> the relation between the sizes of a plane capacitor and it's value, >>>> you may compute permittivity. >>>> For dielectric strength you need a variable voltage supply up to >>>> hundreds of KV and two electrodes with round shapes. Such devices >>>> exists in HV laboratories. >>>> >>>> Vasile >>>> http://www.itim-cj.ro/~vasile/ >>>> >>>> On Sun, Jul 1, 2012 at 4:40 PM, Yigit Turgut wrot= e: >>>>> Permittivity, permeability and conductivity : these are the dielectri= c >>>>> parameters of a material. >>>>> >>>>> You need to determine the permittivity of your material because this >>>>> feature is what responds to electric fields. Unfortunately, it's not >>>>> that easy to calculate precisely. What is your material ? Is it >>>>> isotropic or anisotropic ? Does it respond linearly or non-linearly? >>>>> All these questions rise from the fact the molecular structure of >>>>> materials varies widely. You can't calculate it it but can do some >>>>> simulations and have some acceptable approximations. >>>>> >>>>> On Sun, Jul 1, 2012 at 12:01 PM, Electron w= rote: >>>>>> >>>>>> How do I calculate dielectric strenght of a material (i.e. V/mm unti= l it breaks down >>>>>> in a spark) given the dielectric constant and/or other required prop= erties (and which)? >>>>>> >>>>>> For example, for air (without humidity there to false the results, o= f course) I know it >>>>>> is 1MV/m (1KV/mm), and ten times as much for epoxy.. but how is it c= alculated? >>>>>> >>>>>> Thanks, >>>>>> Mario >>>>>> >>>>>> -- >>>>>> http://www.piclist.com PIC/SX FAQ & list archive >>>>>> View/change your membership options at >>>>>> http://mailman.mit.edu/mailman/listinfo/piclist >>>>> -- >>>>> http://www.piclist.com PIC/SX FAQ & list archive >>>>> View/change your membership options at >>>>> http://mailman.mit.edu/mailman/listinfo/piclist >>>> -- >>>> http://www.piclist.com PIC/SX FAQ & list archive >>>> View/change your membership options at >>>> http://mailman.mit.edu/mailman/listinfo/piclist >>> -- >>> http://www.piclist.com PIC/SX FAQ & list archive >>> View/change your membership options at >>> http://mailman.mit.edu/mailman/listinfo/piclist >> -- >> http://www.piclist.com PIC/SX FAQ & list archive >> View/change your membership options at >> http://mailman.mit.edu/mailman/listinfo/piclist > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .