基于标样比对测试的固体火箭发动机工业CT检测工艺

针对固体火箭发动机CT检测缺少行业标准的问题,使用正密度材料块模拟界面脱粘缺陷和使用合金块模拟药柱内部缺陷来制作标样发动机,对标样发动机和实际发动机进行CT检测对比试验,并解剖取样验证。结果表明发动机CT检测和射线照相、解剖试验结果吻合,标样发动机设计满足研究需要。同时确定了工业CT系统发现缺陷的最小能力:脱粘面积20 mm×20 mm,宽度0.4 mm,气孔和夹杂直径5 mm,裂纹宽度0.4 mm。建立检测标准规范了固体火箭发动机CT检测工艺。

Industrial CT Detection Technology of Solid Rocket Motor Based on Standard Sample Comparison Test

Due to the lack of industry standards of CT detection for solid rocket motors, a standard sample motor was made by using positive density material blocks to simulate the debonding defects and alloy blocks to simulate the defects inside grain. The CT comparison tests were carried out between a standard sample motor and an actual motor, and the actual motor was dissection and sampled for verification. It is shown that results of motor CT detection are consistent with that of radiographic and dissection tests, and design of the standard sample motor meets the requirements of research. The minimum detection ability of industrial CT system is determined: debonding area is 20mm×20mm, width is 0.4mm, diameter of voids and inclusions is 5mm, and width of cracks is 0.4mm. The CT detection standard is established and the CT detection process for solid rocket motors is normalized accordingly.