I could not view your bmp attachment, but let me try.
1) Base on my past experience with phenolic, it tends to be rather brittle. Thus the fracture toughness of the material shall be important. However, basing on your description, the interfacial adhesion strength between the phenolic and steel may be of greater concern.
2) Fracture toughness; otherwise, tensile stress may be more convenient.
3) You may not need to consider this at all. Pressure leakage itself shall be regarded as a failure unless it is a design intend.
regards
> -----Original Message----- > From: Brower Brent (DTUS/CENENG) [SMTP:Brent.Brower@p...] > Sent: Friday, July 09, 1999 8:56 PM > To: 'Xansys (E-mail) > Subject: [xansys] Modeling of phenolic materials
> Hello all,
> I am working on a problem that currently involves modeling phenolic > material.
> The part that I am working with is a composite of phenolic and steel. The > steel is imbedded in the phenolic (see bmp). It is loaded with a pressure > load that acts on the phenolic and steel. The pressure is cycling, so I > will be looking for fatigue failure in the model. Lab tests are done is > static type situation, the pressure is still cycled, but the max. pressure > is quickly increased until the part fails (pressure ramps up over a minute > or so). I have dealt with fatigue before, but not with phenolic. It is > also a theory that the bond between the steel and phenolic allows some > pressure to seep through, thus changing the loading on the part.
> 1) What material properties are important with phenolic? > 2) What results should I look at for failure? ( Max shear stress?) > 3) Are there any thoughts on how to model the change in load due to > pressure leakage between the steel and phenolic? > 4) Any other input on what to look for would be appreciated. > 5) Are there any good recommendations for books?
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