...it seems to me a problem of thermal stresses developing at the interface of the deposited layer and the substrate during cooling down. To my knowledge there are a great many FEM-cotes which should be suitable for treating this problem. For example ABAQUS, MARC, ANSYS and the like. All what...
...see also my answer under "Finite Element Analysis Engineering"
...by the way I forgot to mention there that in case of having the "phase-lag" angle only at a given frequency and not for an relevant range ( ) it would be hard to estimate appropriately, because the...
...well, at least to my knowledge, if time integration is involved, you should rely on the so called "internal variable" approach of viscoelasticity. Here, the characteristic relaxation time constants of the given rubber governs the appropriate differential equations which have to be...
Shear Modulus roughly depends on the Shore-Hardness of the EPDM-grade. Let us assume you would take "ShA50" then the Shear Modulus is about 1MPa. The coefficient of thermal expansion is in the range of 120 to 180*10**(-6) 1/Kelvin
depending on the compound (content of filler etc).
best...
...well, if you need to have a rational procedure to optimise your "vibration-damping" device you first need to know the so called visco-elastic properties of the anticipated rubbery material in a sufficiently broad frequency range. This can be done easily by DMA measurements...
... well, this may depend on which component (body) you are thinking about. For this to clarify I would suggest to read the
following paper:
"Load-compression Relationship of Rubber Unit" by P.B.LINDLEY; Journal of Strain Analysis Vol I No 3 1966
By the way I have in my lab an...
...in real life, on the interface between the metal and the rubber part, there is a small layer of "material" in which (on the rubber side!) the density of "molecular linkages" is much higher than in the rubber bulk itself. That means the stiffness of the rubber increases...
...well, you mean probably a kind of extrusion of the seal into a gap or the like? In that case the stain may be extraordinary large, but yielding will hardly occur, because you should keep in mind that you are dealing with a rubbery material. But what could take place is the following: the...
. . . as was already mentioned earlier in this thread, an attempt to quantify the service life of a rubber component (in the present case a seal)one is confronted with several limitations concerning a proper methodology and lack of knowledge on the fatigue processes of rubbers.
Despite of these...
. . . a good reference may be the book:
How to design with rubber, Carl Hanser publisher
edited by A.Gent
This book gives an excellent overview on fatigue of rubber components etc.
...there is a dump rule which relates shore-hardness to modulus of elasticity (irrespective of the rubber grade you are using). This rule tells us for example:
70 Shore A gives Youngs-Modulus roughly about 6MPa
55 Shore A gives Youngs-Modulus roughly about 3MPa
40 Shore A gives...
...no I do not! But there might be a more or less simple calculation method to determine the time needed to deflate a balloon of certain radius and "pressure gap" (outside pressure minus inside pressure). Because the driving force to squeeze out the contant of the balloon is the stress...
