Finite Element Simulation of NiTiNb Shape Memory Alloy Pipe-Joint Subjected to Coupled Transformation and Plastic Deformation

Table 1

Material parameters of the NiTiNb and the steel.

NiTiNb parameters
Transformation temperature (°C)
Martensite finish		Martensite start		Austenite start		Austenite finish
Mf = −130.89°C		Ms = −90.37°C		As = −68.29°C		Af = −15.75°C
Material constants of joint
E (GPa)	ν	B (MPa/°C)	M0 (°C)	Ct (MPa)	Cp (MPa)	ξ	ζ
45000	0.3	4	−60	300	300	80	15
Y0 (MPa)	R0 (MPa)	Q0 (MPa)	(MPa)	(MPa)	Q1 (MPa)	εL	θ (1/°C)
0	550	120	180	220	300	0.08	10-5
Steel parameters
Material	Elastic modulus	Yield strength		Ultimate strength	Coefficient of thermal expansion		Poisson’s ratio
HR-2 steel	E = 205 GPa	σs = 417 MPa		σb = 720 MPa	α = 1.2 × 10^−5 (1/°C)		ν = 0.28