Questions tagged [elastic-modulus]

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17 questions with no upvoted or accepted answers
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5
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2answers
118 views

Rule of Mixtures calculation

I do not understand something about the "rule of mixtures". Specifically, between upper bound elastic modulus and lower bound elastic modulus calculations, I seriously do not understand what ...
4
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0answers
58 views

Relating internal stress of an o-ring due to thermal expansion to amount of free volume in a gland

I am trying to come up with an analytical way to determine the optimal gland size that an elastomer o-ring will sit in. The amount of free space in the gland is determined by the thickness of two ...
3
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0answers
27 views

Is there any formula to model the effective Young's Modulus of a fluid-filled spherical shell?

I am creating composites of a host epoxy and filler particles which are thin-walled fluid-filled shells. Using the Halpin-Tsai equations, for example, I can predict the bulk composite Young's modulus ...
3
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0answers
99 views

Shape memory alloy fibers with low Young's Modulus?

I am wondering if there exist any species of shape memory alloy fibers with low Young's Modulus at room temperature, for an application I'm working on. So far I've played with Flexinol, but it is a ...
1
vote
2answers
69 views

Youngs modulus in ASTM specification A36

In ASTM A36 I cannot find a single mention of the Youngs modulus of the material. It does mention the tensile strength and yield point among other things. Where is such information normally indicated ...
1
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0answers
27 views

Can concepts like “critical damping” or “resonant frequency” be applied to more complex systems than just a spring and damper in parallel?

I am trying to do some modeling analysis by representing materials with parallel systems of springs and dampers. In the simplest case with just one spring parallel to a damper, we have the traditional ...
1
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0answers
27 views

Shear modulus in terms of 2 Young's moduli and Poisson ratio

I have two moduli, EY and EZ, and the poisson ratio NUYZ, and the equation for the shear modulus that I am using is $G = \frac{EY*EZ}{EY+EZ+2*EY*NUYZ}$ but I am not sure where it comes from. I tried ...
1
vote
1answer
64 views

Determine compressive modulus from compressive strength data in spec sheet?

Is it possible to determine the compressive modulus of a polyethylene foam using the following spec sheet? Minicel Type M Foam It doesn’t contain any information regarding the compressive modulus, ...
1
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0answers
45 views

Is there a standards organization or methodology to determine the elastic material properties of common materials?

Is there a standards organization or methodology to determine the elastic material properties of common materials? What constants are normally used to define these properties? More specifically, the ...
1
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0answers
132 views

Database of elastic constants

I'm interested in locating a database containing the elastic constants (the tensor matrix) for a variety of materials (preferably for a variety of symmetry classes). I don't have a particular material ...
1
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0answers
74 views

how does thickness affect the maximum crushing strength and modulus of rupture of wood?

I have modulus of rupture (MOR) and maximum crushing strength of various species of wood. I am trying to understand how the thickness of wood a wood beam laid flat on the ground would affect both ...
0
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0answers
38 views

Lumber dimensions for machinery ramp

I would love help if anyone is able to offer any. I need to make a ramp to move equipment down a 3.5’ retaining wall. The ramp is to be 12’ long. I was going to use two 6” x 6” beams of Douglas fir, ...
0
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0answers
23 views

Model for dynamic plate deformation

I would like to gather ideas to model the dynamic behaviour of a plate with variable thickness. The assumption are: Small deformations. The plate is all made of the same material with variable ...
0
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0answers
16 views

What's the methodology for adequate tetrahedralisation?

I'm running a linear elastic solver generating the tetrahedron's using tetGen. It's not clear to me though how one defines what's an acceptable tetra density that provides sufficient accuracy. You ...
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0answers
35 views

Thin or thick wall for expanding rubber pressure cylinder

If I want to expand a rubber cylinder by a certain internal volume - with all else held constant (type of material, length and radius (without constraining it), etc.) will a thinner or thicker walled ...
0
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0answers
22 views

Must I use viscoplastic model to fit the thermoplastic material

I need to do the simulation with a specified material. It is known as a thermoplastic. During the simulation, I need to define the material property. I need to choose whether it is viscoplastic or ...
-2
votes
1answer
171 views

Spring Diameter Question

Aluminum 6061-T6 has a density of 2.7 g/cm^3, a Young's modulus of 69 GPa, and an ultimate tensile strength of 310 MPa. If a "spring" were to be made by pulling a 10cm long cylinder of material in ...