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====== Surface Loads ======
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Surface loads are applied to faces of the components participating in the simulation by connecting to the Loads input on the stress solver component.
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{{ :wiki:sns:intactgh:stress_block_loads.png?150 }}
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===== Vector Force =====
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A "Vector Force" load is a surface load applied to a face in a specified direction. An example of this load is pressing on the top of a book to push it across a table.

A Vector Load requires three inputs:
  * the geometry of the surfaces where the load is applied
  * the direction of the force (a vector)
  * the magnitude of the force
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{{ :wiki:sns:snsgrasshopper:vector_load.png?200 }}
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===== Bearing Force =====
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A "Bearing Load" is a surface load applied to a (typically) cylindrical face to approximate the effects of a shaft pressing against the side of a hole.  The applied force gets converted to a varying pressure distribution on the portion of the face experiencing compressive pressure.  The pressure distribution is computed automatically to achieve the specified overall bearing force.

A Bearing Load requires three inputs:
  * the geometry of the surfaces where the load is applied
  * the direction of the bearing force (a vector)
  * the magnitude of the force
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{{ :wiki:sns:snsgrasshopper:bearing_load.png?200 }}
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===== Pressure =====
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A "Pressure" load is a surface load specified in terms of force per unit area. Positive pressures push into the surface, negative pressure pull.

A Pressure Load requires two inputs:
  * the geometry of the surfaces where the pressure is applied
  * the magnitude of the pressure
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{{ :wiki:sns:snsgrasshopper:pressure_load.png?200 }}
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===== Torque =====
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A "Torque" load is a surface load that applies a twisting force around an axis. The direction of the torque is determined using the right hand rule: using your right hand, point your thumb in the direction of the axis. A positive torque value applies a torque acting in the direction the fingers of your right hand would wrap around the axis. The torque load is applied among the load faces with a distribution that varies linearly from zero at the axis.

A Torque load requires three inputs:
  * the geometry of the surfaces where the load is applied
  * the axis of the torque (a line segment)
  * the value of the torque
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{{ :wiki:sns:snsgrasshopper:torque_load.png?200 }}
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===== Hydrostatic Load =====
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A “Hydrostatic” load is a spatially varying pressure as experienced by the walls of a pool due to the weight of the water pressing against them. The pressure at any point depends on the density of the water, increasing from a value of zero at the water surface to a maximum at the deepest point.

A Hydrostatic load requires three inputs:
  * the geometry of the surfaces where the load is applied
  * a point on the surface of the fluid (fluid depth is assumed in the -Z direction)
  * specific gravity of the fluid (dimensionless, SG = 1 for water)
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{{ :wiki:sns:intactgh:hydrostatic_load_block.png?200 }}
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