- 作者: 鄔詩賢
- 作者服務機構: 國立中興大學機械工程系
- 中文摘要: 本文是研究以多孔彈性材料為基礎之脊椎運動骨節的軸向對稱有限元素模式之動態反應。文中發展一種以固體位移,液體位移,固基應力及孔隙液壓力為主變數之全混元步驟來研究脊椎運動骨節受外力負荷下之內部力學行為。本步驟可完全滿足固體及液體之邊界應力。同時,各項特性分析結果亦比以往曾建立之數種類似模式所分析的結果更具有實質上的意義。分析結果顯見流應變之效應比流場更具有意義。在內間盤中之各部材發生的「緊密」及「鬆失」現象亦可能是造成脊椎運動骨節內部破裂或崩潰之導因。高應力集中於覆蓋骨上。有關長期潛變及暫態行為導致之脊椎病態問題亦於文中以結構力學之觀點予以詳細論述。
- 英文摘要: Dynamic responses of the axisymmetric finite element models (FEMs) based on poroelastic materiallaws for the rhesus spinal motion segments (SMSs) were studied. Fully mixed procedures with primaryvariables of solid and fluid displacements, solid matrix stresses and pore fluid pressure, were developed tostudy the internal behaviors of the SMSs under external loadings. Boundary stresses in both solid andfluid parts could be satisfied completely and characteristic results of analysis were more significant thanvarious modelling results given before. Effects of fluid strains were much more significant than flow fields."Tightness" and "softness" of the components in the intervertebral disc (IVD) might be the sources offracture or collapse occuring in the SMSs. High stress was concentrated on the cortical bone. Detaileddiscussion related to the long-time creep and transient behavior in view of the structural mechanics is givenin consideration of the pathological problems occuring in the spine.
- 中文關鍵字: dynamic; poroelastic FEM; fully mixed
- 英文關鍵字: --