Thickness Control of Autoclave-Molded Composite Laminates
Thickness Control of Autoclave-Molded Composite Laminates
复制标题
热压罐成型复合材料层压板的厚度控制
DOI：
10.1115/1.4062581
复制
发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Gongadze E
中科院分区：
文献类型：
--
作者：
Gongadze E
复合材料，特别是由预浸渍(预浸料)材料制成的复合材料在航空航天工业中得到了广泛的应用。为了达到严格的装配尺寸公差要求，制造商依赖于额外的制造步骤，如垫片或加工，这会产生额外的浪费，既耗时又昂贵。预浸料板材自然具有纤维和树脂体积含量的可变性，这导致制造商保证固化层厚度在其标称值的典型+/−5%范围内。对于厚层压板，这相当于厚度变化高达几毫米。为了解决这一问题，建议采用激光原位测量未固化预浸料的厚度，并对层压板的固结和固化过程进行数值模拟，并根据模型预测调整层压板中额外牺牲层的数量。这减少了昂贵和耗时的试错方法、额外的加工操作的需要，并导致生产出具有高精度尺寸的零件。给出了IM7/8552和IM7/977-3的数据，以证明该方法的潜力，以达到几乎准确的平板目标厚度。
Composite materials and especially those made from pre-impregnated (prepreg) material are widely used in the aerospace industry. To achieve the tight assembly dimensional tolerances required, manufacturers rely on additional manufacturing steps like shimming or machining, which generate extra waste, which are time-consuming and expensive. Prepreg sheets come naturally with fiber and resin volume content variability that leads manufacturers to guarantee cured ply thicknesses within a typical +/−5% margin of their nominal values. For thick laminates, this can equate to a thickness variability of as much as a few millimeter. To solve the issue, it is proposed to twin in situ laser measurements of the uncured prepreg thickness with numerical simulations of the laminate autoclave consolidation and cure process and to adjust the number of additional sacrificial plies in the laminate based on the model predictions. This reduces the need for expensive and time-consuming trial and error approaches, extra machining operations, and results in the production of a part with high accuracy dimensions. Data for IM7/8552 and IM7/977-3 are presented to demonstrate the potential of the method to reach an almost exact target thickness for flat panels.