Modelling of mechanical properties of randomly oriented strand thermoplastic composites
Modelling of mechanical properties of randomly oriented strand thermoplastic composites
复制标题
随机取向股热塑性复合材料机械性能的建模
DOI：
10.1177/0021998316654748
复制
发表时间：
2017
影响因子：
2.9
通讯作者：
A. Yousefpour
中科院分区：
文献类型：
--
作者：
M. Selezneva;S. Roy;Sean Meldrum;L. Lessard;A. Yousefpour
航空航天工业中出现了一种新的兴趣，即使用不连续的纤维碳/聚醚醚酮模塑系统(通过将单向胶带切割成股来获得)来制造具有复杂几何形状的部件。这种类型的复合材料可以获得极好的成形性和高模数，但测量性能的高度可变性可能会对设计允许值产生不利影响。当谈到力学性能的预测时，重要的是要获取平均强度和模数以及它们的统计变异性。本文提出了一种随机有限元技术，它使用随机取向的概念来模拟变异性，并应用Hashin的破坏准则和断裂能来估计强度。总体而言，该模型与实验中观察到的趋势相吻合，并表明由于最弱连接原理，随机取向的层合板的强度显著低于连续纤维层合板的强度。
There is an emerging interest in the aerospace industry to manufacture components with intricate geometries using discontinuous-fibre carbon/polyether-ether-ketone moulding systems (obtained by cutting unidirectional tape into strands). Great formability and high modulus can be achieved with this type of composites, but the high variability of measured properties can have a detrimental effect on the design allowables. When it comes to prediction of mechanical properties, it is important to capture the average strength and modulus as well as their statistical variability. This article proposes a stochastic finite element technique that uses the concept of randomly oriented strands to model variability, and the application of Hashin’s failure criteria and fracture energies to estimate strength. Overall, the model matches the trends observed during experiments and shows that strength of randomly oriented strand composites is significantly lower than that of continuous-fibre laminates due to the ‘weakest-link’ principle.