Production integrated nondestructive testing of composite materials and material compounds _ an overview

19th Chemnitz Seminar on Materials Engineering – 19. Werkstofftechnisches Kolloquium

Straß, B.^1 ; Conrad, C.^1 ; Wolter, B.^1

Fraunhofer Institute for Nondestructive Testing IZFP, Campus E3.1, Saarbrücken

66123, Germany^1

关键词: Dynamic thermography;    Eddy current techniques;    Electromagnetic acoustic transducers;    In-line inspections;    Light-weight constructions;    Material utilization;    Production efficiency;    Run-time measurement;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/181/1/012017/pdf
DOI  :  10.1088/1757-899X/181/1/012017

来源: IOP

【 摘 要 】

Composite materials and material compounds are of increasing importance, because of the steadily rising relevance of resource saving lightweight constructions. Quality assurance with appropriate Nondestructive Testing (NDT) methods is a key aspect for reliable and efficient production. Quality changes have to be detected already in the manufacturing flow in order to take adequate corrective actions. For materials and compounds the classical NDT methods for defectoscopy, like X-ray and Ultrasound (US) are still predominant. Nevertheless, meanwhile fast, contactless NDT methods, like air-borne ultrasound, dynamic thermography and special Eddy-Current techniques are available in order to detect cracks, voids, pores and delaminations but also for characterizing fiber content, distribution and alignment. In Metal-Matrix Composites US back-scattering can be used for this purpose. US run-time measurements allow the detection of thermal stresses at the metal-matrix interface. Another important area is the necessity for NDT in joining. To achieve an optimum material utilization and product safety as well as the best possible production efficiency, there is a need for NDT methods for in-line inspection of the joint quality while joining or immediately afterwards. For this purpose EMAT (Electromagnetic Acoustic Transducer) technique or Acoustic Emission testing can be used.