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首页> 外文期刊>ASAIO journal >Constitutive framework for biodegradable polymers with applications to biodegradable stents.
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Constitutive framework for biodegradable polymers with applications to biodegradable stents.

机译：用于生物可降解聚合物的本构框架及其在生物可降解支架中的应用。

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摘要

Biodegradable polymeric stents must provide mechanical support of the stenotic artery wall up to several months while being subjected to cyclic loading that affects the degradation process. To understand the applicability and efficacy of biodegradable polymers, a two-pronged approach involving experiments and theory is necessary. This article addresses the second aspect, the development of a theoretical framework within which the behavior of such materials can be studied. We present a constitutive model for polymers that undergo deformation induced-degradation. For our purpose, degradation is the scission of chemical bonds of the backbone chain, results in molecular weight reduction, and consequently in the commonly observed softening. A model of a solid capable of degradation, which in its absence responds like an elastic solid, is developed. We assume the existence of a scalar field that reflects the local state of degradation and changes the properties of the material. A rate equation for the measure of degradation that depends on strain is coupled with the balance of linear momentum. Uniaxial extension of a body, which in the absence of degradation behaves as a neo-Hookean elastic solid, exhibits stress relaxation, creep, and hysteresis, due to degradation.
机译：可生物降解的聚合物支架必须承受长达数月的狭窄动脉壁的机械支撑，同时还要承受影响降解过程的周期性载荷。为了了解可生物降解聚合物的适用性和功效，必须采用涉及实验和理论的两管齐下的方法。本文针对第二个方面，即理论框架的发展，可以在其中研究此类材料的行为。我们提出了经历变形诱导降解的聚合物的本构模型。为了我们的目的，降解是主链的化学键断裂，导致分子量降低，因此导致通常观察到的软化。建立了能够降解的固体模型，在没有固体的情况下，该模型会像弹性固体一样做出响应。我们假设存在一个标量场，该标量场反映了降解的局部状态并改变了材料的特性。取决于应变的退化度量的速率方程式与线性动量平衡相耦合。物体的单轴延伸在没有退化的情况下表现为新霍克弹性体，由于退化而呈现出应力松弛，蠕变和滞后现象。

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