Abstract Ultrasonic testing as a non-destructive evaluation (NDE) technique is newly introduced to characterize additively manufactured composite materials to identify their anisotropic mechanical properties, being especially facile, useful and accurate approach for dimensional dependent measurement. In this study, the immersion ultrasonic technique is employed to measure the energy loss of ultrasonic elastic waves, and wave propagation speed in the laser-sintered nanocomposite of carbon nanotube reinforced polyamine 12. The relationship of process-structure-property is revealed to establish the correlations between process parameters and energy loss of ultrasound, as well as mechanical moduli. The orientation-dependent wave attenuation and mechanical moduli of nanocomposites along three orthogonal directions are strongly associated with the layer-by-layer fusion induced microstructures and internal imperfections. This technique is capable of quantifying orientation-dependent mechanical properties such as moduli and attenuation without compromising additively manufactured parts, showing a high potential of quality control and safety inspection in end-use applications.

中文翻译：

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选择性激光烧结聚合物纳米复合材料的超声无损评估

摘要 超声检测作为一种无损评估 (NDE) 技术被新引入以表征增材制造的复合材料，以确定其各向异性的机械性能，特别是用于尺寸相关测量的简便、有用和准确的方法。本研究采用浸入式超声技术测量了超声弹性波的能量损失和波在碳纳米管增强聚胺 12 激光烧结纳米复合材料中的传播速度。揭示了工艺-结构-性能的关系，以建立工艺参数与超声能量损失以及机械模量之间的相关性。纳米复合材料沿三个正交方向的取向依赖波衰减和机械模量与逐层融合引起的微观结构和内部缺陷密切相关。该技术能够在不影响增材制造部件的情况下量化依赖于方向的机械特性，例如模量和衰减，显示出在最终用途应用中的质量控制和安全检查的巨大潜力。