Drag anchor - input_data.json¶
The complete input_data.json for Tutorial 6. Every key is described on the input_data.json file format page.
The run folder also needs the anchor geometry - fluke_round_nose.stl, fluke_round_nose_mesh.txt, shank_scv2.stl and shank_scv2_mesh.txt - from the top level of the AMPSSIE repository.
{
"GPU": "on",
"domain": {
"size": 2.0,
"gravity": [0.0, 0.0, -9.81]
},
"material points": {
"extra capacity": 1.2,
"element size": 4.0,
"number of material points per element 1": 2,
"material size": { "min": [0.0, 0.0], "max": [100, 10] },
"layers": [
{
"thickness": 18.123,
"material": { "type": "willam warnke",
"E": 2.4e6, "nu": 0.25,
"friction angle": 28.5, "dilation angle": 0.0, "cohesion": 300.0,
"density": 925.4,
"E overburden": { "reference stress": 1.913e5, "exponent": 0.6875 } }
}
]
},
"rigid bodies": [
{
"offset": [1.0, 0.0, 0.0],
"points": [
{ "position": [0.62, 0.0, 0.0], "mass": 3291.60, "rotational inertia": [275.0, 275.0, 275.0],
"boundary conditions": ["free", "fixed", "free", "fixed", "free", "fixed"] },
{ "position": [1.7592, 0.0, 0.0], "mass": 1058.40, "rotational inertia": [337.5, 337.5, 337.5],
"boundary conditions": ["free", "fixed", "free", "fixed", "free", "fixed"] },
{ "position": [12.5294, 0.0, 0.0], "mass": 1.0, "rotational inertia": [1.0e-6, 1.0e-6, 1.0e-6],
"boundary conditions": ["fixed", "fixed", "fixed", "fixed", "fixed", "fixed"] }
],
"constraints": [
{ "type": "rotation lock", "points": [1, 2],
"rotation centre": [0.489, 0.0, 0.0],
"direction 1": [0.0, 1.0, 0.0],
"direction 2": [0.0, 1.0, 0.0],
"stiffness": 1.0e9, "rotational stiffness": 1.0e8 },
{ "type": "distance stop", "points": [1, 2],
"rotation centre": [0.489, 0.0, 0.0],
"position 1": [0.62, 0.0, 0.0],
"position 2": [0.62, 0.0, 0.0],
"angle limit": 35, "stiffness": 8.5814e9 },
{ "type": "distance lock", "points": [2, 3],
"position 1": [3.0294, 0.0, 0.0],
"position 2": [12.5294, 0.0, 0.0],
"distance": 9.5, "stiffness": 1.0526e9 }
],
"stl files": [
{ "name": "fluke", "stl": "fluke_round_nose.stl",
"mesh cache": "fluke_round_nose_mesh.txt", "point": 1 },
{ "name": "shank", "stl": "shank_scv2.stl",
"mesh cache": "shank_scv2_mesh.txt", "point": 2 }
]
}
],
"contact": {
"friction coefficient": 0.45
},
"analysis": [
{
"type": "static",
"load steps": 5,
"load": "gravity ramp",
"rigid bodies": "off",
"adaptivity": { "type": "uniform" },
"boundary conditions": { "min": ["roller", "roller", "fixed"], "max": ["roller", "roller", "fixed"] }
},
{
"type": "dynamic",
"dt": 5.0e-3,
"final time": 1.0,
"beta": 0.5,
"gamma": 1.0,
"rigid bodies": "on",
"rigid body surface placement": "on",
"adaptivity": {
"type": "rigid body surface",
"element size": 0.1
},
"boundary conditions": { "min": ["fixed", "roller", "fixed"], "max": ["roller", "roller", "fixed"] },
"boundary track": {
"min": { "type": ["fixed", "off", "off"], "distance": [0.5, 0.0, 0.0], "advance": ["positive", "positive", "positive"], "remove": ["yes", "no", "no"] },
"max": { "type": ["fixed", "off", "off"], "distance": [2.5, 0.0, 0.0], "advance": ["positive", "positive", "positive"], "remove": ["no", "no", "no"] }
}
},
{
"type": "dynamic",
"dt": 8.0e-2,
"final time": 3.0,
"beta": 0.5,
"gamma": 1.0,
"rigid bodies": "on",
"rigid body surface placement": "off",
"adaptivity": {
"type": "rigid body surface",
"element size": 0.1
},
"rigid body boundary conditions": [
{ "system": 1, "point": 3, "boundary conditions": [{ "prescribed": 0.008 }, "fixed", "fixed", "fixed", "fixed", "fixed"] }
],
"boundary conditions": { "min": ["fixed", "roller", "fixed"], "max": ["roller", "roller", "fixed"] },
"boundary track": {
"min": { "type": ["fixed", "off", "off"], "distance": [0.5, 0.0, 0.0], "advance": ["positive", "positive", "positive"], "remove": ["yes", "no", "no"] },
"max": { "type": ["fixed", "off", "off"], "distance": [5.0, 0.0, 0.0], "advance": ["positive", "positive", "positive"], "remove": ["no", "no", "no"] }
}
}
],
"solver": {
"tolerance": 1.0e-6,
"max newton iterations": 20,
"poor factor": 0.25,
"ghost factor": 0.025,
"ghost factor mass": 0.25
},
"output": {
"vtk": "on",
"vtk directory": "vtk_AC14",
"vtk percent": 0.25,
"vtk material point fields": ["displacement", "velocity", "stress", "strain", "volume"],
"vtk rigid body fields": ["position", "velocity", "reaction force"],
"csv": "on",
"csv directory": "csv_AC14",
"csv percent": 0.25,
"csv material point fields": ["initial position", "position", "stress"],
"csv rigid body fields": ["position", "velocity", "reaction force", "reaction moment"]
}
}