A stochastic approach to model material variation determining tow impregnation in out-of-autoclave prepreg consolidation
A stochastic approach to model material variation determining tow impregnation in out-of-autoclave prepreg consolidation
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DOI：
10.1016/j.compositesa.2015.03.021
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发表时间：
2015-10-01
影响因子：
8.7
通讯作者：
Hubert, P.
中科院分区：
文献类型：
--
作者：
Helmus, R.;Hinterhoelzl, R.;Hubert, P.
材料变化总是存在的，即使在高压灭菌器外的预浸料是机器制造的。它们在很大程度上决定了固结，并可能最终导致最终零件内的空洞，这取决于所应用的工艺条件。为了捕获任何偶然性，推导了随机微分方程来描述OoA固结中的各种相互作用现象。第二步，采用Karhunen-Loeve截断对概率空间进行离散化，并采用概率配置方法对流动和压实问题进行确定性求解。初始浸渍程度由奥恩斯坦乌伦贝克过程表示，并与ct图像校准。(C) 2015 Elsevier Ltd.版权所有。
Material variations are always present even though out-of-autoclave prepregs are machine-made. They strongly determine the consolidation and may eventually lead to voids within the final part, depending on applied process conditions. To capture any contingencies, stochastic differential equations are derived to describe various interacting phenomena in OoA consolidation. In a second step the probabilistic space is discretized using the Karhunen-Loeve truncation and the Probabilistic Collocation method is applied in order to use deterministic solvers for flow and compaction problems. The initial degree of impregnation is represented by an Ornstein Uhlenbeck process and calibrated with CT-images. (C) 2015 Elsevier Ltd. All rights reserved.