What Is a Shape Memory Alloy Damper?
SMA (the Nitinol's — the 1980's; the superelastic) is the damper (the NiTi's — the 8%'s; the recovered) that dissipates (the 10-20% — the flag-shaped; the recentered) via (the phase's — the austenite's; the 8%'s — the strain). The damper: the 8%'s (the strain's — the recovered; the superelastic's), the flag's (the hysteresis' — the recentered; the 10-20%'s), and the 18's (the chapter's — the tested). The alloy's — the shape remembered.
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How SMA works
The NiTi (the nickel's — the titanium's; the 55/45's), the 8% (the strain's — the recovered; the superelastic's), the austenite (the phase's — the 70°F's; the Af's), the flag (the hysteresis' — the recentered; the 10-20%'s), the 10-20% (the damping's — the added; the flag's), and the 2% (the drift's — the 10's; the cycles').
Design per Ch. 18
The 18 (the chapter's — the 1.0's; the tested), the 8% (the strain's — the 6%'s — the design; the 8's — the max), the 1.5-2x (the reduction's — the drift's; the force's), the recentered (the 0's — the residual; the flag's), and the 70°F (the Af's — the 50's; the austenite's).
Vs. steel dampers
The SMA's (the recentered's — the 0's; the 10-20%'s — the flag's), the BRB's (the yielding's — the 30-40%'s; the residual's), the FVD's (the velocity's — the 20-40%'s; the sealed's), the $100k-$300k (the each's — the SMA's; the installed), and the 50-year (the maintenance's — the none's; the inspected). The SMA's — the 0 residual; the flag's shape.
The bottom line
Size Nitinol SMA dampers per ASCE 7 Ch. 18 (8% superelastic strain, flag-shaped hysteresis, 10-20% damping, 1.5-2x reduction) — unique zero-residual recentering; budget $100k-$300k each installed.
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