Influence of ultrasonic preforming to the mechanical properties of carbon fiber reinforced composites
The so called sequential preforming of thermoplastic bindered dry fiber structures is an important step in the manufacturing process of carbon fiber parts within the aerospace industry. State of the art technologies performing this step are in most cases discontinuously, difficult to automate and do not achieve the claimed fiber volume content. A new approach is the continuous application of ultrasonic welding systems to join the layers. Beside technological issues as well the influence of this process to the mechanical properties of the composite is outstanding. The present paper attends to this question and investigates the consequences of the ultrasonic preforming to the tension-, ILSS-, and CAI-behavior for relevant laminates within the aerospace industry.
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