Journal of Textile Research ›› 2021, Vol. 42 ›› Issue (11): 71-76.doi: 10.13475/j.fzxb.20210101206

• Textile Engineering • Previous Articles     Next Articles

Design of fatigue testing device and fatigue resistance evaluation of artificial ligaments

LU Jun1,2, GUAN Xiaoning1,2, LIN Jing1,2(), LAO Jihong1,2, WANG Fujun1,2, LI Yan1,2, WANG Lu1,2   

  1. 1. College of Textiles, Donghua University, Shanghai 201620, China
    2. Key Laboratory of Textile Science & Technology of Ministry of Education, Donghua University, Shanghai 201620, China
  • Received:2021-01-08 Revised:2021-05-31 Online:2021-11-15 Published:2021-11-29
  • Contact: LIN Jing E-mail:jlin@dhu.edu.cn

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Abstract:

Aiming at the graft failure of artificial ligaments under complex mechanical environment in the knee joint cavity, an artificial ligament fatigue testing device was built, composing of a tensile motion module, a torsion motion module, a flexion motion module and an insulation temperature liquid return system. Clinical physiological parameters such as tensile displacement, torsion angle and flexion angle of the human body during normal walking were selected for fatigue tests and evaluation of fatigue resistance of artificial ligament specimens. The results showed that the friction damage between fibers and yarns was the main fatigue damage mode of the specimens and the tensile property of the specimens suffered some loss after fatigue and the normalized tensile modulus decreased exponentially with time. The macromolecular chains of the specimens were subjected to a series of multi-directional loads such as tension, compression, torsion and flexion during the fatigue test, which ultimately led to a decrease in crystallinity.

Key words: artificial ligament, fatigue test, ligament graft, fatigue resistance, medical textiles

CLC Number: 

  • TS101.8

Fig.1

Tensile motion module"

Fig.2

Torsion motion module"

Fig.3

Flexion motion module"

Fig.4

Artificial ligament fatigue testing device"

Tab.1

Fatigue test program"

状态 拉伸隔距/mm 扭转角度/(°) 屈曲角度/(°)
初始状态 34.64 15 60
加载状态 45.00 0 0
结束状态 34.64 15 60

Fig.5

Apparent morphology at different fatigue time points of specimen AL24-0(a) and specimen AL24-6(b)"

Fig.6

Morphology of fatigue fracture of commercial graft failure specimen(a) and specimen AL24-0(b)(×500)"

Tab.2

Mesoscopic evaluation results"

测试时间/h 断裂强力/N 刚度/(N·mm-1)
AL24-0 AL24-6 AL24-0 AL24-6
0 2 533.68±31.67 3 093.22±90.67 178.05±3.92 275.51±19.09
8 2 444.24±45.94 2 664.98±97.06 205.27±4.17 278.96±6.20
16 1 856.06±292.85 2 612.02±112.95 173.39±11.42 254.07±11.13
24 1 363.89±136.76 2 283.39±88.10 180.65±9.35 254.12±7.49

Fig.7

Normalized tensile modulus-time curves of two specimens"

Tab.3

Crystallinity test results"

试样名称 结晶度/%
0 h 8 h 16 h 24 h
AL24-0 39.59 43.45 37.58 34.22
AL24-6 40.11 42.41 39.23 38.04
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