[Retracted] Mechanical Analysis and Clinical Application of Butterfly-Shaped Patellar Claw

Table 2

Commonly used mechanical properties of nickel-titanium alloys.

Performance	Test results
Elastic modulus	Mother phase: 83GPa; Martensite: 28-41 GPa
Poisson’s ratio	0.33
Yield strength	Mother phase: 195-690 MPa; Martensite: 70-140 MPa
Breaking strength	Fully annealed state: 895 MPa; Work hardened state: 1900 MPa
Elongation at break	Fully annealed state: 25%-50%; Work hardened state: 5%-10%
Stress concentration factor	8.5
Shape memory recovery rate	98%
Maximum recoverable strain	7.3%
Resilience	436.5 MPa
Fatigue life	times
Nonlinear hyperelasticity	8.1%
Linear hyperelastic strain phase	4.3%
Damping performance (tanδ)	0.03 (completely austenite); 0.10 (complete martensite)