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Added test cases for Bingham Material
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,217 @@ | ||
| import pytest | ||
| import jax.numpy as jnp | ||
| from diffmpm.material import Bingham | ||
| from diffmpm.particle import Particles | ||
| from diffmpm.element import Quadrilateral4Node | ||
| from diffmpm.constraint import Constraint | ||
| from diffmpm.node import Nodes | ||
|
|
||
| particles_element_targets = [ | ||
| ( | ||
| Particles( | ||
| jnp.array([[0.5, 0.5]]).reshape(1, 1, 2), | ||
| ( | ||
| Bingham( | ||
| { | ||
| "density": 1000, | ||
| "youngs_modulus": 1.0e7, | ||
| "poisson_ratio": 0.3, | ||
| "tau0": 771.8, | ||
| "mu": 0.0451, | ||
| "critical_shear_rate": 0.2, | ||
| "ndim": 2, | ||
| } | ||
| ) | ||
| ), | ||
| jnp.array([0]), | ||
| ), | ||
| Quadrilateral4Node( | ||
| (1, 1), | ||
| 1, | ||
| (4.0, 4.0), | ||
| [], | ||
| Nodes(4, jnp.array([-2, -2, 2, -2, -2, 2, 2, 2]).reshape((4, 1, 2))), | ||
| ), | ||
| jnp.array([0.0, 0.0, 0.0, 0.0, 0.0, 0.0]).reshape((6, 1)), | ||
| ), | ||
| ( | ||
| Particles( | ||
| jnp.array([[0.5, 0.5]]).reshape(1, 1, 2), | ||
| ( | ||
| Bingham( | ||
| { | ||
| "density": 1000, | ||
| "youngs_modulus": 1.0e7, | ||
| "poisson_ratio": 0.3, | ||
| "tau0": 771.8, | ||
| "mu": 0.0451, | ||
| "critical_shear_rate": 0.2, | ||
| "ndim": 2, | ||
| } | ||
| ) | ||
| ), | ||
| jnp.array([0]), | ||
| ), | ||
| Quadrilateral4Node( | ||
| (1, 1), | ||
| 1, | ||
| (4.0, 4.0), | ||
| [(0, Constraint(0, 0.02)), (0, Constraint(1, 0.03))], | ||
| Nodes(4, jnp.array([-2, -2, 2, -2, -2, 2, 2, 2]).reshape((4, 1, 2))), | ||
| ), | ||
| jnp.array([-52083.3333333333, -52083.3333333333, 0.0, 0.0, 0.0, 0.0]).reshape( | ||
| (6, 1) | ||
| ), | ||
| ), | ||
| ( | ||
| Particles( | ||
| jnp.array([[0.5, 0.5]]).reshape(1, 1, 2), | ||
| ( | ||
| Bingham( | ||
| { | ||
| "density": 1000, | ||
| "youngs_modulus": 1.0e7, | ||
| "poisson_ratio": 0.3, | ||
| "tau0": 200.0, | ||
| "mu": 200.0, | ||
| "critical_shear_rate": 0.2, | ||
| "ndim": 2, | ||
| } | ||
| ) | ||
| ), | ||
| jnp.array([0]), | ||
| ), | ||
| Quadrilateral4Node( | ||
| (1, 1), | ||
| 1, | ||
| (4.0, 4.0), | ||
| [(0, Constraint(0, 2.0)), (0, Constraint(1, 3.0))], | ||
| Nodes(4, jnp.array([-2, -2, 2, -2, -2, 2, 2, 2]).reshape((4, 1, 2))), | ||
| ), | ||
| jnp.array( | ||
| [-5208520.35574006, -5208613.86694342, 0.0, -233.778008402801, 0.0, 0.0] | ||
| ).reshape((6, 1)), | ||
| ), | ||
| ( | ||
| Particles( | ||
| jnp.array([[0.5, 0.5]]).reshape(1, 1, 2), | ||
| ( | ||
| Bingham( | ||
| { | ||
| "density": 1000, | ||
| "youngs_modulus": 1.0e7, | ||
| "poisson_ratio": 0.3, | ||
| "tau0": 200.0, | ||
| "mu": 200.0, | ||
| "critical_shear_rate": 0.2, | ||
| "ndim": 2, | ||
| "incompressible": True, | ||
| } | ||
| ) | ||
| ), | ||
| jnp.array([0]), | ||
| ), | ||
| Quadrilateral4Node( | ||
| (1, 1), | ||
| 1, | ||
| (4.0, 4.0), | ||
| [(0, Constraint(0, 2.0)), (0, Constraint(1, 3.0))], | ||
| Nodes(4, jnp.array([-2, -2, 2, -2, -2, 2, 2, 2]).reshape((4, 1, 2))), | ||
| ), | ||
| jnp.array( | ||
| [-187.0224067222, -280.5336100834, 0.0, -233.778008402801, 0.0, 0.0] | ||
| ).reshape((6, 1)), | ||
| ), | ||
| ] | ||
|
|
||
|
|
||
| @pytest.fixture | ||
| def state_vars(): | ||
| return {"pressure": jnp.zeros(1)} | ||
|
|
||
|
|
||
| @pytest.fixture | ||
| def dt(): | ||
| return 1.0 | ||
|
|
||
|
|
||
| @pytest.mark.parametrize( | ||
| "particles, element, target", | ||
| particles_element_targets, | ||
| ) | ||
| def test_compute_stress(particles, state_vars, element, target, dt): | ||
| particles.update_natural_coords(element) | ||
| if element.constraints: | ||
| element.apply_boundary_constraints() | ||
| particles.compute_strain(element, dt) | ||
| stress = particles.material.compute_stress(None, particles, state_vars) | ||
| assert jnp.allclose(stress, target) | ||
|
|
||
|
|
||
| def test_key_not_present_in_material_properties(): | ||
| with pytest.raises(KeyError): | ||
| material = Bingham( | ||
| { | ||
| "density": 1000, | ||
| "youngs_modulus": 1.0e7, | ||
| "poisson_ratio": 0.3, | ||
| "tau0": 771.8, | ||
| "critical_shear_rate": 0.2, | ||
| "ndim": 2, | ||
| } | ||
| ) | ||
|
|
||
|
|
||
| @pytest.mark.parametrize( | ||
| "particles, element, target, state_vars", | ||
| [ | ||
| (Particles( | ||
| jnp.array([[0.5, 0.5, 0.5, 0.5]]).reshape(2, 1, 2), | ||
| ( | ||
| Bingham( | ||
| { | ||
| "density": 1000, | ||
| "youngs_modulus": 1.0e7, | ||
| "poisson_ratio": 0.3, | ||
| "tau0": 200.0, | ||
| "mu": 200.0, | ||
| "critical_shear_rate": 0.2, | ||
| "ndim": 2, | ||
| } | ||
| ) | ||
| ), | ||
| jnp.array([0,0]), | ||
| ), | ||
| Quadrilateral4Node( | ||
| (1, 1), | ||
| 1, | ||
| (4.0, 4.0), | ||
| [(0, Constraint(0, 2.0)), (0, Constraint(1, 3.0))], | ||
| Nodes(4, jnp.array([-2, -2, 2, -2, -2, 2, 2, 2]).reshape((4, 1, 2))), | ||
| ), | ||
| jnp.array( | ||
| [ | ||
| -5208520.35574006, | ||
| -5208613.86694342, | ||
| 0.0, | ||
| -233.778008402801, | ||
| 0.0, | ||
| 0.0, | ||
| -5208520.35574006, | ||
| -5208613.86694342, | ||
| 0.0, | ||
| -233.778008402801, | ||
| 0.0, | ||
| 0.0, | ||
| ] | ||
| ).reshape((2, 6, 1)), | ||
| {"pressure": jnp.zeros((2, 1))}), | ||
| ], | ||
| ) | ||
| def test_compute_stress_two_particles(particles, state_vars, element, target, dt): | ||
| particles.update_natural_coords(element) | ||
| if element.constraints: | ||
| element.apply_boundary_constraints() | ||
| particles.compute_strain(element, dt) | ||
| stress = particles.material.compute_stress(None, particles, state_vars) | ||
| assert jnp.allclose(stress, target) |