Moisture transport in PA6 and its influence on the mechanical properties
Moisture transport in PA6 and its influence on the mechanical properties
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DOI：
10.1007/s00161-019-00815-w
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发表时间：
2020-03-01
影响因子：
2.6
通讯作者：
Diebels, S.
中科院分区：
文献类型：
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作者：
Sharma, P.;Sambale, A.;Diebels, S.
各种研究都报道了聚酰胺吸水后力学性能的变化和形态的改变。然而，当地含水率与物性变化之间的关系尚未在耦合模型中得到巩固。本文提出了一种既能模拟水的扩散，又能模拟局部含水率对尼龙6(PA6)刚性影响的模拟模型。为此，将非线性扩散模型和粘弹性材料模型耦合起来，建立了有限元模型。用Galerkin有限元方法建立了这两个物理过程的弱形式方程。利用牛顿法求解耦合的非线性方程组。利用重量法对扩散过程进行了实验研究。对不同含水率下饱和的聚酰胺试件进行了松弛试验。基于这些实验结果，确定了材料参数对局部含水率的依赖关系，并建立了高效、稳定的数值模拟模型。
Various studies have reported the changes in the mechanical properties and the modification in morphology of polyamide due to the absorption of water. However, the relation between the local water content and the alteration in the properties has not been consolidated in a coupled model yet. In the current work, a simulation model is proposed that can capture the diffusion of water as well as simulate the effect of the local moisture content on the stiffness of polyamide (PA6). To this end, a finite element model was developed by coupling of a nonlinear diffusion model and a viscoelastic material model. The Galerkin finite element method was used to formulate the weak form of the equations for the two physical processes. The coupled nonlinear equations were solved with the help of the Newton method. The diffusion process was studied experimentally with the help of gravimetric measurements. Relaxation tests were conducted on the polyamide specimens that were saturated under different moisture levels. Based on these experimental results, the dependency of the material parameters on the local moisture content was identified and an efficient and stable numerical simulation model has been developed.