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Specifies how differential stiffness is applied to rod, bar, and beam elements. There are four options:
- TENSION - Differential stiffness is only added when the element is in tension.
- COMPRESSION - Differential stiffness is only added when the element is in compression.
- COUPLED - Differential stiffness is added regardless of loading and includes coupled torsional terms.
- BOTH - Differential stiffness is added regardless of loading and does not include coupled torsional terms.
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