Effect of tool surface topography on friction with carbon fibre tows for composite fabric forming
Effect of tool surface topography on friction with carbon fibre tows for composite fabric forming
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DOI：
10.1016/j.compositesa.2016.10.017
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发表时间：
2017-02-01
影响因子：
8.7
通讯作者：
Sutcliffe, Michael P. F.
中科院分区：
文献类型：
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作者：
Mulvihill, Daniel M.;Sutcliffe, Michael P. F.
研究了复合材料织物干成形过程中刀具表面粗糙度对刀对摩擦的影响。刀具平均表面粗糙度R-a值范围从0.005到3.2 μ m，用于碳纤维束的摩擦测试。随着粗糙度幅度的增加，这些表面的测量斜率显著增加，这是关键的表面地形特征。对于非常光滑的表面（R-a < 0.1 μ m），摩擦对粗糙度地形非常敏感，并且随着粗糙度斜率和振幅的减小而增加。对于粗糙的表面（R-a > 0.1 μ m），摩擦对粗糙度斜率和振幅相对不敏感。用拖刀接触的有限元理想化来解释拖刀一致性水平方面的这些结果。光滑的表面有较低的斜度，因此具有良好的一致性，因此具有较高的实际接触面积和摩擦力。粗糙的表面有很高的斜度，特别是在较短的波长，这阻碍了良好的一致性。在这种情况下，纤维和表面之间的点接触占主导地位，从而使摩擦对粗糙度不那么敏感。(C) 2016年作者。Elsevier Ltd.出版。
The effect of tool surface roughness topography on tow-on-tool friction relevant to the dry forming of composite fabrics is investigated. A comprehensive range of tool average surface roughness R-a values from 0.005 to 3.2 mu m was used in friction testing with carbon fibre tows. The Measured slope of these surfaces, which is the critical surface topographical characteristic, increased significantly with increasing roughness amplitude. Friction was found to be sensitive to roughness topography for very smooth surfaces (R-a < 0.1 mu m) and increased with decreasing roughness slope and amplitude. For rougher surfaces (R-a > 0.1 mu m), friction was relatively insensitive to roughness slope and amplitude. A finite element idealisation of the tow-on-tool contact was used to explain these results in terms of the level of tow-tool conformance. Smooth surfaces have low slopes which allow, good conformance, and hence high real contact area and friction. Rougher surfaces have high slopes, particularly at shorter wavelengths, which prevents good conformance. In this case, point contact between fibres and surface dominates, leaving the resulting friction less sensitive to roughness. (C) 2016 The Authors. Published by Elsevier Ltd.