In this study, we proposed a test method to evaluate the strength of a curved section of 3D printed continuous carbon fiber reinforced thermoplastics. Curved beam tests were conducted using L-shape specimens to evaluate the strength of the curved section. To test thin L-shape specimens, test jigs were designed. In this process, finite element analyses were conducted to testify that the designed jigs were appropriate for evaluating the strength of the curved section. Several L-shape specimens with different geometries, respectively, were tested to evaluate the effect of radius on the circumferential strength. Additionally, the failure mechanism was investigated by observing the inner structure via X-ray CT. These tests revealed that compressive failure first occurred and that the compressive stress decreased as the radius became smaller.

在这项研究中，我们提出了一种评估3D打印连续碳纤维增强热塑性塑料弯曲部分强度的测试方法。使用L形试样进行弯曲梁测试，以评估弯曲截面的强度。为了测试薄的L形样品，设计了测试夹具。在此过程中，进行了有限元分析以证明设计的夹具适合评估弯曲部分的强度。分别测试了几个具有不同几何形状的L形试样，以评估半径对圆周强度的影响。此外，通过X射线CT观察内部结构来研究破坏机理。这些测试表明，首先发生压缩破坏，并且随着半径变小，压缩应力减小。