Commit 2018-07-23

1. Description

A center of gravity and mass extractor for interactions has been implemented in Metafor.

The synthax is the same as other extractors:

valuesmanager = metafor.getValuesManager()
extractor1 = InteractionGravityCenterAndMassValueExtractor(interaction)
valuesmanager.add(nbr, extractor1, name = "TheNameYouWant")        # manages extraction, result storage...

At each archiving step the extractor fills a four columns text file, where columns 1-3 contain x, y, and z coordinates of the center of gravity respectively, and column 4 contains the value of the mass.

Since the evolution of the density is not directly tracked in Metafor, the mass matrix is directly employed to take into account the density variation for the computation of the center of gravity and mass.

To compute the center of gravity and the mass of an interaction a density different from zero is needed. Pay attention, when you define your material properties, to explicitly define a MASS_DENSITY different from zero, otherwise a FATAL_ERROR is raised.

2. Tests

For the moment, a gravity center and mass extractor has been added in apps/imp/bounce.py and for all the test cases contained in apps/monosMaterials2 and mtThixo/tests/monoMaterials2 run via apps/toolbox/materialTesting.py. A density different from zero has been defined where needed.

A bug has been found in the initialization of the NortonHoff materials physical properties. In particular the function Material::initPrMat() was used instead of MechanicalMaterial::initPrMat() so that the density was not initialized for these materials. This justifies the large amounts of diffs in the tests involving NortonHoff materials between the present commit and the previous versions of Metafor.

Added [a] / deleted [d] / modified [m] / renamed [r] test cases

[m] apps/imp/bounce.py
[m] apps/toolbox/materialTesting.py
[m] apps/monoMaterials2/EvpAnisoDamageAlvBoneRemod.py
[m] apps/monoMaterials2/EvpAnisoDamageBoneRemod.py
[m] apps/monoMaterials2/EvpAnisoDamageDummy.py
[m] apps/monoMaterials2/EvpAnisoDamageLemaitre.py
[m] apps/monoMaterials2/EvpIsoDamageAlvBoneRemod2.py
[m] apps/monoMaterials2/EvpIsoDamageBoneRemod.py
[m] apps/monoMaterials2/NortonHoff.py
[m] mtThixo/tests/monoMaterials2/ThixoEnhanced.py
[m] mtThixo/tests/monoMaterials2/ThixoEquivalentNortonHoff.py
[m] mtThixo/tests/monoMaterials2/ThixoMicroMacro.py
[m] mtThixo/tests/monoMaterials2/ThixoNortonHoff.py