COMPRESSIVE STRESS-RELAXATION BEHAVIOR OF BOVINE GROWTH-PLATE MAY BE DESCRIBED BY THE NONLINEAR BIPHASIC THEORY
COMPRESSIVE STRESS-RELAXATION BEHAVIOR OF BOVINE GROWTH-PLATE MAY BE DESCRIBED BY THE NONLINEAR BIPHASIC THEORY
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DOI：
10.1002/jor.1100120608
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发表时间：
1994-11-01
影响因子：
2.8
通讯作者：
MOW, VC
中科院分区：
文献类型：
--
作者：
COHEN, B;CHORNEY, GS;MOW, VC
在体外研究了牛股骨远端生长板的压缩行为。在圆柱形骨-生长板-生长板内部和周围的骨标本上进行应变速率控制、压缩应力松弛实验。本文研究的问题是：(a)具有应变相关渗透率的非线性双相理论能否用于描述牛生长板的压应力松弛行为？(b)关于软骨-骨界面渗透性的不同假设如何影响推断的生长板的材料特性？(c)生长板的外围和内部在这些特性上有什么不同吗？利用有限元模型和最小二乘曲线拟合程序，从压缩应力松弛数据中计算了材料的固有双相特性——聚合模量（H-A）、泊松比(v)和非线性应变相关渗透率系数（k(o)和M）。为了验证生长板的本构模型，使用确定的固有双相特性进行了一组独立的有限元分析，并将这些有限元预测与随后使用两种较慢压缩率获得的同一试件的两组附加实验数据进行了比较。这些有限元预测与后两组数据之间取得了很好的一致性。骨料模量对软骨-骨界面的渗透性不敏感。渗透率系数对界面渗透率条件非常敏感，泊松比对界面渗透率条件仅轻微敏感。因此，生长板的外围比内部更柔顺，渗透性更强。
The compressive behavior of the bovine distal femoral growth plate was studied in vitro. Strain-rate controlled, compression stress relaxation experiments were performed on cylindrical bone-growth plate-bone specimens from the interior and periphery of the growth plate. The questions addressed in this study were (a) Can the nonlinear biphasic theory one with strain-dependent permeability, be used to represent the compressive stress-relaxation behavior of bovine growth plate? (b) How do different assumptions concerning the permeabilities of the chondro-osseous interfaces influence the inferred material properties of the growth plate? and (c) Are there any differences in these properties between the periphery and the interior of the growth plate? Intrinsic biphasic material properties-aggregate modulus (H-A), Poisson's ratio (v), and nonlinear strain-dependent permeability coefficients (k(o) and M)-were calculated from the compression stress-relaxation data with use of a finite element model and a least squares curve-fitting procedure. To verify this constitutive model for the growth plate, an independent set of finite element analyses was performed with use of the determined intrinsic biphasic properties, and comparisons were made between these finite element predictions and two additional sets of experimental data subsequently obtained for the same specimens with use of two slower rates of compression. Excellent agreement was achieved between these finite element predictions and the latter two sets of data. The aggregate modulus was found to be insensitive to the permeability of the chondro-osseous interface. The permeability coefficients were very sensitive to, and the Poisson's ratio was only slightly sensitive to the interface permeability condition. Therefore, the periphery of the growth plate is more compliant and permeable than the interior.