Accession Number:

ADA350805

Title:

Use of Ultrasonic Tape Lamination for In-Process Debulking of Thick Composite Structures

Descriptive Note:

Professional paper

Corporate Author:

NAVAL AIR WARFARE CENTER AIRCRAFT DIV PATUXENT RIVER MD

Report Date:

1998-01-01

Pagination or Media Count:

10.0

Abstract:

Foster-Miller has developed an advanced processing technique for organic matrix composites called ultrasonic Tape Lamination UTL. This technique employs ultrasonic energy to insonify composite tape either thermoplastic or B-staged thermoset to induce controlled and virtually instantaneous viscoelastic and frictional heating in the composite. UTL can be used for in-process debulking and controlled staging of thick filament wound or fiber placed composite structures. During UTL the ultrasonic horn functions as a localized, efficient, and quick response heat source, ideally suited for a feedback control system. The horn heats only the area with which it is in direct contact, and ultrasonic loading can enhance fiber nesting to optimize debulking. With the use of UTL on-the-fly debulking during filament winding or tape placement, a net shape part can be realized without time consuming and expensive repetitive debulking steps. Problems associated with inadequate debulking, including fiber waviness or marcelling, fiber shifting, resin migration, disbonds and voids, can be eliminated. Higher quality thick composite parts can be achieved with minor process modifications, resulting in a superior and less costly part.

Subject Categories:

  • Laminates and Composite Materials
  • Manufacturing and Industrial Engineering and Control of Production Systems
  • Acoustics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE