FAQ 004396 | How do you transform the elasticity and shear modulus properties of a membrane fabri...

Question:

How do you transform the elasticity and shear modulus properties of a membrane fabric with the usual syntax force/length into the general syntax force/surface for the input in RFEM?



Answer:

The thickness of membranes is usually very thin compared to the planar extension. Due to these extreme geometric conditions, the stiffness of membrane fabrics is usually directly related to a strip width, ie line (cf. line spring), without considering the thickness.



In contrast, the general FEM program RFEM processes material definitions (E, G, ν, etc.) and surface properties (shell, membrane, etc.) independently of each other. Thus, with the pure definition of the material, it is still unclear whether B. is a rigid plate structure or a tension-loaded flexible membrane structure. The final element specification only results with the additional consideration of the surface properties for the simulation. Therefore, RFEM always requires the description of stiffness in the general unit syntax force/surface, regardless of the geometric conditions of the structural component to be simulated.



Thus, the line-related membrane stiffness in the force/length syntax can be transferred to the force/surface syntax in RFEM by considering a reference thickness d :



where

F ... Force

L ... Length

d ... Reference thickness

A ... Surface



The stiffness thus transformed in the force/surface format is thus related to the reference thickness used and can convert the initially specified membrane stiffness in the force/length format in RFEM by specifying the reference thickness d as the membrane surface thickness.



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Keywords:

#DlubalFAQ #ModulusOfElasticity #GModulus #Membrane #ReferenceThickness #SurfaceThickness #StandardFormat #FrequentlyAskedQuestion #FAQAboutDlubal #QuestionAndAnswerAboutDlubal

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