8000 Isotropic class constructor accept others pairs than Young Modulus and Poissons Ratio · Issue #18 · compmec/section · GitHub
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Isotropic class constructor accept others pairs than Young Modulus and Poissons Ratio #18

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carlos-adir opened this issue Feb 14, 2024 · 1 comment
Open

Isotropic class constructor accept others pairs than Young Modulus and Poissons Ratio #18

carlos-adir opened this issue Feb 14, 2024 · 1 comment
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easy fix Issue that is easily fixed enhancement New feature or request

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@carlos-adir
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A Isotropic instance can have the attributes:

  • E Young Modulus
  • ν Poissons Ratio
  • λ Lamé's first parameter
  • μ Lamé's second parameter
  • G Shear Modulus
  • K Bulk Modulus
  • M P-Wave Modulus

In fact, to construct an object, it's only needed two values from these, as shown in Lamé Parameters

Currently, the constructor accepts only the pair (young_modulus, poissons_ratio).
It would be nice to add the other combinations.
@carlos-adir carlos-adir added enhancement New feature or request good first issue Good for newcomers labels Feb 14, 2024
carlos-adir added a commit that referenced this issue Feb 14, 2024
@carlos-adir
chore: Restrict Isotropic constructor to accept only young and poissons
b41a106 
Restrict Isotropic's constructor to accept only the pair
(young_modulus, poissons_ratio). Other combinations are still valid,
like shown in #18
@carlos-adir
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It's possible by solving the non-linear equations:

$$\lambda + 2G - M = 0$$

$$3\lambda + 2G - 3K = 0$$

$$\lambda \left(E-3G\right)+ G\left(E-2G\right) = 0$$

$$\lambda \left(1-2\nu\right)-2\nu G = 0$$

carlos-adir added a commit that referenced this issue Feb 22, 2024
@carlos-adir
refactor: explicit restrict Isotropic constructor
46fb104 
restrict Isotropic constructor to accept only the pair (young_modulus, poissons_ratio), as mentioned in #18
@carlos-adir carlos-adir added easy fix Issue that is easily fixed and removed good first issue Good for newcomers labels Mar 5, 2024
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