I. Pre-defined User Options

Many of the material models and boundary conditions use functions, directions, or points to define variables in the code. To reduce the size of the input file, some of the common user options have been defined.

Table 4 Pre-defined functions, directions, and points that can be used in a SIERRA SM analysis.

Option	Name	Description
Function	SIERRA_CONSTANT_FUNCTION_ZERO	Output zero at all times
	SIERRA_CONSTANT_FUNCTION_ONE	Output one at all times
	SIERRA_LINEAR_RAMP_FUNCTION	Output simulation time
	SIERRA_COS_RAMP_FUNCTION	Output cosine ramp starting at beginning of simulation and ending at termination time
Direction	SIERRA_DIRECTION_X	Defined direction in (1,0,0)
	SIERRA_DIRECTION_Y	Defined direction in (0,1,0)
	SIERRA_DIRECTION_Z	Defined direction in (0,0,1)
	SIERRA_DIRECTION_NEG_X	Defined direction in (-1,0,0)
	SIERRA_DIRECTION_NEG_Y	Defined direction in (0,-1,0)
	SIERRA_DIRECTION_NEG_Z	Defined direction in (0,0,-1)
Point	SIERRA_POINT_ORIGIN	Defined point at (0,0,0)