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Acta Metall Sin  2017, Vol. 53 Issue (10): 1331-1336    DOI: 10.11900/0412.1961.2017.00233
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Study on Lightweight Design and Biomechanical Property of High Nitrogen Nickel Free Stainless Steel Plate: Effect of Thickness Thinning
Yibin REN1, Haochuan ZHAO1,2, Ke YANG1()
1 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2 AECC Guizhou Liyang Aviation Power Co., LTD, Guiyang 550014, China
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Yibin REN, Haochuan ZHAO, Ke YANG. Study on Lightweight Design and Biomechanical Property of High Nitrogen Nickel Free Stainless Steel Plate: Effect of Thickness Thinning. Acta Metall Sin, 2017, 53(10): 1331-1336.

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Abstract  

High nitrogen nickel free stainless steel (HNNFSS) has begun to be used in clinic, which possesses excellent mechanical properties, corrosion resistance and biocompatibility. Especially its strength is two times more than that of the conventional 316L stainless steel, but this advantage is not fully used in optimization of both the structure and the size of the implant devices. In this work, the effect of thickness change of HNNFSS bone plate on the biomechanical behavior of bone plate was studied by means of finite element analysis. The result showed that the resistances to bending, tension and compression of HNNFSS plate are all better than those of 316L plate when its thickness is thinned less than 18%. The internal fixation of the lightweight HNNFSS plate was also studied by a 12 weeks rabbit femur fracture model and the result showed that the HNNFSS plate with about 14% thickness thinning could promote the healing and reconstruction of bone fracture of rabbit femur in comparison with 316L plate.
Key words:  high nitrogen nickel free stainless steel      lightweight      biomechanics      finite element     
Received:  16 June 2017     
ZTFLH:  R318.08  
Fund: Supported by National Natural Science Foundation of China (No.31370976)
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Yibin REN
Haochuan ZHAO
Ke YANG

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https://www.ams.org.cn/EN/10.11900/0412.1961.2017.00233     OR     https://www.ams.org.cn/EN/Y2017/V53/I10/1331

Biomedical metal Condition Yield strength
MPa		 Tensile strength
MPa		 Elongation
%
316L stainless steel[20] Annealed ≥190 ≥490~690 ≥40
Cold deformation ≥600 ≥860~1100 ≥12
Ti-6Al-4V[21] Annealed ≥830 ≥895 ≥10
HNNFSS (ASTM)[22] Annealed ≥517 ≥827 ≥30
Cold deformation ≥1241 ≥1379 ≥12
HNNFSS (IMR, CAS)[8,19]
 Annealed 616 1032 59
10% cold deformation 990 1180 42
30% cold deformation 1410 1470 20
Table 1  Mechanical properties of HNNFSS and clinically used medical metal materials[8,19-22]
Fig.1  Dimension of the stainless steel plate in the study (unit: mm)
Material Condition E
GPa		 Poisson ratio Density
kgm-3		 Friction coefficient True strain True stress
MPa
HNNFSS 20% cold rolled 189 0.27 7715 0.2 0.0064 0.1451 0.3026 1207.7 1432.9 1675.5
316L 20% cold rolled 200 0.30 7800 0.2 0.0040 0.1506 0.1645 800.0 908.0 912.1
Table 2  Material parameters of the stainless steel plate in the study
Fig.2  Simulated load-displacement curves of 316L stainless steel plate and HNNFSS plates with different thicknesses in the three point bending test
Fig.3  Stress nephograms of 316L stainless steel plate (a) and HNNFSS plates with thicknesses of 1.1 mm (b), 1.0 mm (c), 0.9 mm (d) and 0.8 mm (e) in the three point bending test
Fig.4  Simulated load-displacement curves of 316L stainless steel plate and HNNFSS plates with different thicknesses in the tension test
Fig.5  Simulated load-displacement curves of 316L stainless steel plate and HNNFSS plates with different thicknesses in the compression test
Fig.6  Load-displacement curves of 12 weeks healing for broken femur fixed by 316L stainless steel plates and lightweight HNNFSS plates and original femurs in the three point bending test
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