Manufacture of prosthetic nucleus and analysis of stress-relaxation properties
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摘要: 對聚乙烯醇水凝膠髓核假體進行了應力松弛性能的研究,比較不同溶脹率和不同初始聚乙烯醇含量對應力松弛性能的影響.等時線法的研究分析表明,髓核假體的力學行為符合線性粘彈性行為,三元件線性粘彈模型能較好地模擬其粘彈力學行為(模擬擬合度均在0.96 以上).三元件線性粘彈模型參數分析表明,對于髓核假體來說,溶脹率的增大可以增加髓核假體消散沖擊力的速度,但對消散沖擊力的總量影響不大,初始PVA含量的提高將降低髓核假體消散沖擊力的速度和總量.Abstract: Isochronal plots and a three-parameter linear viscoelastic model were used to characterize the stressrelaxation properties of PVA-H prosthetic nucleus and to analyze the influence of swelling ratio and initial PVA content upon the stress-relaxation properties. The results ofisochronal plots showed that PVA-H prosthetic nucleus followed a linear viscoelastic mechanical property. The three-parameter linear viscoelastic model can simulate the viscoelastic property of prosthetic nucleus well with the fitness more than 0.96. It can be seen from the analysis of parameters in the model that the increase of the swelling ratio will greatly increase the speed of dissipated stress of the prosthetic nucleus, and does not have too much influence on the total dissipated stress; but the increase of the initial PVA content will decrease both the speed and the total of the dissipating stress.
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