Custom Material Simulation

[Anonymous]

i made a chair with Rattan (C.Manan) as a material, since fusion has no Rattan material, i create one with my research properties, i only get Young Modulus number and Density, without Yield Strenght, or tensile strenght. and then i start simulation in and going well. but theres something i doubt about my stress simulation, both of them only have slightly differences (only few number of von mises stress).

properties 1 (rattan cane):

density 0.520 g/cm3 and 3.450 GPa

properties 2 (rattan cane + composite):

density 0.87 g/cm3 and 21.6 GPa

the von mises stress result is max 11MPa fot the first properties and 14 MPa for the second.
what i doubt is, why the better properties have the bigger number stress.

i dont know how to read that number.
i nees something to elighten me.

thanks

[John_Holtz]

Hi @Anonymous 

Stress is related to the load and how it passes through the structure, such as stress = force/area, or stress = bending moment*c/I. Notice that these two equations do not include the Young's modulus (E). So in many cases, the stress is independent of the Young's modulus.

Where the modulus can have an effect is how a higher stiffness of one part changes how the loads transfer through the model, and that is what causes the stress to change.