Block Format Keyword
/PROP/TYPE28 - Multi-Strand Property Set
Description
Describes the multi-strand property set.
Format
(1)
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(2)
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(3)
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(4)
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(5)
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(6)
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(7)
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(8)
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(9)
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(10)
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/PROP/TYPE28/prop_ID/unit_ID or /PROP/NSTRAND/prop_ID/unit_ID
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prop_title
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Mass
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K
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C
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fct_ID1
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fct_ID2
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Y_SCAL
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X_SCAL
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Specific friction coefficient for pulleys or strands (optional) (Comments 9 and 10)
(1)
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(2)
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(3)
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(4)
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(5)
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(6)
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(7)
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(8)
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(9)
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(10)
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Type
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k
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Field
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Contents
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SI Unit Example
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prop_ID
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Property identifier
(Integer, maximum 10 digits)
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unit_ID
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Optional unit identifier
(Integer, maximum 10 digits)
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prop_title
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Property title
(Character, maximum 100 characters)
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Mass
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Mass per unit length
(Real)
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K
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Stiffness for a length of a unitary length
(Real)
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C
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Damping coefficient of a unitary length
(Real)
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fct_ID1
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Function identifier defining 
(Integer)
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fct_ID2
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Function identifier defining 
(Integer)
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Compression failure strain
Default = -1030 (Real)
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Tension failure strain
Default = 1030 (Real)
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Y_SCAL
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Coefficient for the force (homogeneous to a force)
Default = 1.0 (Real)
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X_SCAL
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Coefficient for the strain rate (homogeneous to a force)
Default = 1.0 (Real)
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Pulley general friction coefficient
(Real)
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Strand general friction coefficient
(Real)
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Type
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Keyword "PULLEY" or “STRAND” (left justified)
(Character)
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k
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Pulley or strand number (internal node number in the element)
(Integer)
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Friction coefficient at pulley or along strand
(Real)
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| 1. | To define the connectivity of multi-strand elements, refer to /XELEM. |
| 2. | The force in the spring is computed as: |
Linear spring:
Nonlinear spring:
if  or 
where,  is the engineering strain:
and L0 is the reference length of element.
| 3. | If  , |
| 4. | If  , |
| 5. | Pulley type friction is defined (except at end nodes of the element). |
| 6. |  is the force in strand connecting nodes Nk-1 and Nk. |
| 7. | Fk is the force in strand connecting nodes Nk and Nk+1 . |
| 8. | One can also define friction along strands. |
| 9. | Specific friction coefficients is defined (different from general values) for some pulleys or for some strands (Line 6). |
| 10. | If n is the total number of nodes of an element, strands are numbered from one to (n) and all pulleys (internal nodes) are numbered from 2 to (n-1). |
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See Also:
Material Compatibility
/SPRING
/TH/NSTRAND
Spring definition in Model Preparation in User's Guide
Spring (TYPE28 and TYPE32) in User's Guide
Multistrand elements (TYPE28) in Theory Manual
