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首页> 外文期刊>SAMPE Journal >Vacuum-Bag Manufacturing of Honeycomb Structures: Opportunity for In-Situ Process Monitoring and Non-Destructive Voidage Estimates
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Vacuum-Bag Manufacturing of Honeycomb Structures: Opportunity for In-Situ Process Monitoring and Non-Destructive Voidage Estimates

机译：蜂窝结构的真空袋制造：现场过程监控和无损空隙估计的机会

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摘要

A helicopter crew door was manufactured using out-of-autoclave prepregs and vacuum-bag-only processing techniques. Non-metallic honeycomb core was used to stiffen the structure. Miniature pressure sensors were embedded in the demonstrator to measure the honeycomb core pressure throughout the lay-up, including intermittent de-bulking, the pre-cure vacuum hold, and the elevated temperature cure. The sensors identified two insightful process phenomena: 1) gas evacuation increased with additional plies, implying that de-bulking may increase a skin's air permeability, thereby decreasing total process time, and 2) a non-uniform pressure response was observed in the part during cure, potentially leading to variations in part quality. Visible part quality was acceptable, excluding small radii geometrical features, a known source for defects in bag processing of woven materials. Internal part quality (voidage) was estimated in the honeycomb regions using pulsed infrared thermography non-destructive-evaluation. Calibration curves were generated by comparing thermography to micro-computed tomography images of the same samples. Macro-porosity around fibre bundles was identified as the major voidage source in these structures, and the thermography inspection identified significant local voidage variations over the part.
机译：直升机机舱门是使用高压灭菌的预浸料和仅使用真空袋的加工技术制造的。非金属蜂窝芯用于加固结构。微型压力传感器嵌入演示器中，以测量整个叠层中的蜂窝芯压力，包括间歇性减薄，预固化真空保持和高温固化。传感器识别出两个有深刻见解的过程现象：1）排空增加了额外的层，这意味着散装可能会增加皮肤的透气性，从而减少总的过程时间; 2）在此过程中，零件中观察到压力响应不均匀固化，可能导致零件质量变化。可见的零件质量是可以接受的，但不包括小的半径几何特征（已知的编织材料袋加工缺陷的来源）。使用脉冲红外热成像非破坏性评估来评估蜂窝区域的内部零件质量（空隙）。通过将热成像与相同样品的微型计算机断层扫描图像进行比较来生成校准曲线。纤维束周围的大孔隙被确定为这些结构中的主要空隙源，并且热成像检查确定了零件上明显的局部空隙变化。

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