Composite manufacturing processes usually proceed from preimpregnated preforms that are consolidated by simultaneously applying heat and pressure, so as to ensure a perfect contact compulsory for making molecular diffusion possible. However, in practice, the contact is rarely perfect. This results in a rough interface where air could remain entrapped, thus affecting the effective thermal conductivity. Moreover, the interfacial melted polymer is squeezed flowing in the rough gap created by the fibers located on the prepreg surfaces. Because of the typical dimensions of a composite prepreg, with thickness orders of magnitude smaller than its other in-plane dimensions, and its surface roughness having a characteristic size orders of magnitude smaller than the prepreg thickness, high-fidelity numerical simulations for elucidating the impact of surface and interface roughness remain today, despite the impressive advances in computational availabilities, unattainable. This work aims at elucidating roughness impact on heat conduction and the effective viscosity of the interfacial polymer squeeze flow by using an advanced numerical strategy able to reach resolutions never attained until now, a sort of numerical microscope able to attain the scale of the smallest geometrical detail.

中文翻译：

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使用基于 PGD 的分离表示法研究薄的粗糙聚合物界面的有效电导率和表观粘度

复合材料制造工艺通常从预浸料坯开始，通过同时施加热量和压力来固化，以确保完美接触，使分子扩散成为可能。然而，在实践中，接触很少是完美的。这会导致粗糙的界面，其中空气可能会被截留，从而影响有效的热导率。此外，界面熔化的聚合物在由位于预浸料坯表面上的纤维形成的粗糙间隙中被挤压流动。由于复合预浸料的典型尺寸，其厚度比其他面内尺寸小几个数量级，并且其表面粗糙度的特征尺寸比预浸料厚度小几个数量级，尽管在计算可用性方面取得了令人瞩目的进步，但用于阐明表面和界面粗糙度影响的高保真数值模拟仍然存在。这项工作旨在阐明粗糙度对热传导和界面聚合物挤压流的有效粘度的影响，通过使用能够达到迄今为止从未达到的分辨率的先进数值策略，一种能够获得最小几何细节尺度的数值显微镜.