Figure 1 Rhombus structure of stent with 4 rhombus units – 8 struts [11]

Figure 2 a) Reduced stent model used for axisymmetric structural analysis b) the reduced balloon model along the length c) The reduced stent with balloon combined model used for axisymmetric structural analysis.

Figure 3 a) frictionless contact surfaces b) meshed stent and artery used for analysis

Figure 4 a) Graph showing the displacement boundary condition steps b) Free faces and faces with frictionless supports used in axisymmetric analysis

Figure 5 SS 316L: a) Maximum equivalent Von Mises stress when the balloon is fully expanded b) residual stress retained by the stent after deflation of balloon c) maximum total deformation at fully expanded condition d) total deformation due to recoiling when the balloon deflates e) Maximum displacement along X at fully expanded balloon and f) displacement along X after recoiling.

Figure 6CoCrFeNiMn: a) Maximum equivalent Von Mises stress when the balloon is fully expanded b) residual stress retained by the stent after deflation of balloon c) maximum total deformation at fully expanded condition d) total deformation due to recoiling when the balloon deflates e) Maximum displacement along X at fully expanded balloon and f) displacement along X after recoiling.

Figure 7 Al0.1CoCrFeNi: a) Maximum equivalent Von Mises stress when the balloon is fully expanded b) residual stress retained by the stent after deflation of balloon c) maximum total deformation at fully expanded condition d) total deformation due to recoiling when the balloon deflates e) Maximum displacement along X at fully expanded balloon and f) displacement along X after recoiling.

Parameters	Values
Length	15 mm
Outer diameter	3.0mm
Strut width	0.05mm
Strut thickness	0.05 mm
Longest diagonal of the rhombus	1.62mm
Shortest diagonal of the rhombus	1.18 mm
No. of units along circumference	8

Table 1. Dimensions of the stent model

Material	Yield strength MPa	Ultimate strength MPa	Young's modulus GPa	Tangent modulus GPa	Density kg/m3	Poisson's ratio
SS 316L	190	490	193	1.93	8000	0.3
CoCrFeNiMn	216	475	189	0.643	7954	0.3
Al0.1CoCrFeNi	212	570	203	0.843	7950	0.3

Table 2. Mechanical properties of SS 316L and Al0.1CoCrFeNi and CoCrFeNiMn HEAs added to ANSYS Workbench library

Steps	Time [s]	X [mm]	Y [mm]	Z [mm]
1	0.	0.	0.	0.
	1.	0.75
2	2.	0.	= 0.	= 0.

Table 3: Displacement boundary in cylindrical coordinate system for the balloon

Material	Max Von Mises stress MPa	Max residual stress MPa	Max total deformation mm	Recoil percentage %
SS 316L	410	177	1.156	3.7
CoCrFeNiMn	323	193	1.161	3.2
Al0.1CoCrFeNi	345	191	1.596	3.1

Table 4. Summary of results generated from computational analysis