【摘要】：背景:松質(zhì)骨是一種多孔、非均質(zhì)、各向異性和具有黏彈性的結構,是骨的重要組成部分。它在負載傳輸和能量吸收方面起著十分重要的作用。所以對松質(zhì)骨的力學行為進行研究具有重要意義。目的:探討單軸壓縮實驗中應力率對松質(zhì)骨性能的影響以及不同應力值下松質(zhì)骨的蠕變行為。方法:以新鮮的豬股骨松質(zhì)骨為實驗材料,施加不同的應力率,至試樣的壓縮應變達到5%卸載;在松質(zhì)骨表面施加恒定的應力水平,并保持7 200 s,以便觀察其蠕變應變變化。結果與結論:(1)單軸壓縮實驗中,在同一應變條件下,隨著應力率的增加,應力值、楊氏模量也增加;(2)在不同的加載率作用下,松質(zhì)骨的壓縮應力-應變曲線不重合,說明松質(zhì)骨的壓縮力學性能具有率相關性;(3)在蠕變實驗中,蠕變應變隨著壓縮的應力的增加而增加,蠕變?nèi)崃侩S著應力的增加反而減少;(4)軸壓縮和蠕變實驗結果說明,應力率和恒定應力水平對松質(zhì)骨的力學性能影響很大,以上結果可以為如何避免松質(zhì)骨損傷提供參考依據(jù)。
[Abstract]:Background: cancellous bone is a porous, heterogeneous, anisotropic and viscoelastic structure, which is an important part of bone. It plays a very important role in load transmission and energy absorption. Therefore, it is of great significance to study the mechanical behavior of cancellous bone. Aim: to investigate the effect of stress rate on the properties of cancellous bone in uniaxial compression test and the creep behavior of cancellous bone under different stress values. Methods: fresh porcine cancellous femur bone was used as experimental material. Different stress rates were applied until the compressive strain of the specimen was 5% unloaded, and a constant stress level was applied on the surface of the cancellous bone, and the creep strain was observed for 7 200 s. Results and conclusions: (1) in uniaxial compression experiments, under the same strain condition, the stress value and Young's modulus also increased with the increase of stress rate, (2) under different loading rates, the compressive stress-strain curve of cancellous bone did not coincide. The results show that the compressive mechanical properties of cancellous bone are rate-dependent. (3) in creep experiment, the creep strain increases with the increase of compressive stress, and the creep compliance decreases with the increase of stress. (4) the results of axial compression and creep test show that, The stress rate and constant stress level have great influence on the mechanical properties of cancellous bone. The above results can provide a reference for how to avoid the damage of cancellous bone.
【作者單位】： 天津理工大學天津市先進機電系統(tǒng)設計與智能控制重點實驗室;
【基金】：國家自然科學基金資助項目(11572222) 天津市自然科學基金資助項目(16JCYBJC28400)~~
【分類號】：R318.01;R68
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本文編號：2284824