Unidirectional CFRP kinking under uniaxial compression modeled using synchrotron radiation computed tomography imaging

摘要

The kinking mechanism in unidirectional carbon fiber-reinforced polymers (CFRPs) needs be characterized to improve structural design. Thus, we performed a uniaxial compression test on a CFRP under synchrotron radiation computed tomography to experimentally obtain its load-displacement relationship. The specimen was observed to be fractured with a kink band during postmortem analysis. The shape and size of the kink band coincided with previously reported data. In addition, the fiber locations on the tomographic images prior to loading were identified via image processing, and three-dimensional unidirectional CFRP models were constructed using the geometric information. Subsequently, finite element models were developed to simulate the compressive failure conditions. The numerical analysis revealed that the kink formation was caused by expanded matrix yielding and fiber breakage.