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首页> 外文期刊>Computer Methods in Applied Mechanics and Engineering >Strain-damage coupled algorithm for cancellous bone mechano-regulation with spatial function influence
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Strain-damage coupled algorithm for cancellous bone mechano-regulation with spatial function influence

机译：具有空间功能影响的松质骨力学调控的应变-损伤耦合算法

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摘要

In this work, a bone adaptation law based on fully coupled stimulus function taking into account strain-damage effects and spatial function influence based on ruptured osteocytes processes concept have been developed and implemented into Abaqus code. Contrary to previous works where the spatial function was considered without damage influence, in the present model, we propose a novel idea to describe osteocytes ruptured processes using damaged spatial function. Also, the stimulus reference value for bone resorption threshold is considered cycles depending variable and an experimental fitted relation between the strain reference value and the cycle's number was proposed. In order to reduce the computation time, the integration of the damage growth rate is based on the cycle blocks approach. The idea is that the real cycles number are reduced (divided) into equivalent cycles blocks. Damage accumulation is computed over the cycles blocks and extrapolated over the real correspond cycles. To illustrate the capabilities of the remodeling algorithm, four mechano-regulation laws have been implemented and tested corresponding to four stimuli functions: (i) strain based stimulus without damage influence, (ii) fully coupled strain-damage without spatial function influence, (iii) fully coupled strain-damage with non damaged spatial function influence and (iv) fully coupled strain-damage with damaged spatial function influence.
机译：在这项工作中，已经开发出了基于完全耦合的刺激功能的骨骼适应律，并考虑了基于破损骨细胞过程概念的应变损伤效应和空间功能的影响，并将其实施到Abaqus代码中。与先前的考虑空间功能不受损害影响的先前工作相反，在本模型中，我们提出了一种新颖的想法来描述使用受损空间功能的骨细胞破裂过程。另外，将骨吸收阈值的刺激参考值视为取决于变量的周期，并提出了应变参考值与周期数之间的实验拟合关系。为了减少计算时间，损伤增长率的积分是基于循环块法的。这个想法是将实际循环数减少（划分）为等效循环块。在周期块上计算损伤累积，并在实际对应的周期上外推。为了说明重塑算法的功能，已针对四种刺激功能实施并测试了四种机械调节定律：（i）基于应变的刺激而无损伤影响;（ii）完全耦合的应变-损伤而不受空间功能影响;（iii ）具有不受破坏的空间函数影响的完全耦合的应变损伤，以及（iv）具有破坏的空间函数影响的完全耦合的应变损伤。

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