The arrangement of the constituents of organic-composite friction materials is a key factor of their microstructure and thermal and mechanical properties which can influence braking performance. Among these constituents, fibres can present complex morphologies and different arrangements depending on their type and the process of manufacturing. Besides, synergistic effects acting between these constituents and the resulting properties are still not well investigated. This work relates to rock- wool used for brake friction materials, and for which the process can lead to various arrangements. The focus is on synergies between these fibre arrangements and the other material constituents, in ways that reveals the link between the resulting microstructural characteristics and properties of organic composite materials. To achieve these objectives, two simplified formulations are elaborated with two distinct arrangements of rock wool fibres. The friction materials are investigated in terms of microstructure, thermo-physical and mechanical properties. It is found that fibre arrangements affect carbonaceous particle distribution, porosity, and fibre-matrix adhesion. On one side, homogeneous distribution and regular size of fibre bundles results in a better connectedness of conductive particles and thus enhances thermal conductivity. On the other side, a regular fibre bundles repartition lead to a more homogeneous distribution of strain localizations and a softer mechanical response.

中文翻译：

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纤维排列对有机复合材料微观结构和性能的协同作用

有机复合摩擦材料的成分排列是其微观结构和热力学性能的关键因素，可以影响制动性能。在这些成分中，纤维可以呈现复杂的形态和不同的排列，这取决于它们的类型和制造过程。此外，这些成分之间的协同作用和由此产生的特性仍未得到很好的研究。这项工作涉及用于制动摩擦材料的岩棉，并且该过程可以导致各种安排。重点是这些纤维排列与其他材料成分之间的协同作用，以揭示有机复合材料的微观结构特征与性能之间的联系的方式。为了实现这些目标，两种简化的配方是用两种不同的岩棉纤维排列而成的。从微观结构、热物理和机械性能方面研究摩擦材料。发现纤维排列影响碳质颗粒分布、孔隙率和纤维-基质粘附。一方面，纤维束的均匀分布和规则尺寸导致导电颗粒更好的连接性，从而提高导热性。另一方面，规则的纤维束重新分配导致应变局部分布更均匀，机械响应更柔和。发现纤维排列影响碳质颗粒分布、孔隙率和纤维-基质粘附。一方面，纤维束的均匀分布和规则尺寸导致导电颗粒更好的连接性，从而提高导热性。另一方面，规则的纤维束重新分配导致应变局部分布更均匀，机械响应更柔和。发现纤维排列影响碳质颗粒分布、孔隙率和纤维-基质粘附。一方面，纤维束的均匀分布和规则尺寸导致导电颗粒更好的连接性，从而提高导热性。另一方面，规则的纤维束重新分配导致应变局部分布更均匀，机械响应更柔和。