UCLA Extension

Repair of Composite Structures

Composite materials are being used extensively for military and commercial aircraft structures including Boeing 787 and Airbus A350-XWB. However, the composite structures can be damaged easily in service due to various impact events and environmental exposure. As a result, there is an increasing need for high quality repair, especially on fuselages, wings and other safety-critical primary structures. This course focuses on repair technology of aircraft composite and sandwich structures including bonded repair process, bolted repair process, repair analysis and validation, repair design criteria and repair assessment and inspection.

Coordinator and Lecturer

Jenn-Ming Yang, PhD, Professor and Chair, Department of Materials Science and Engineering, Henry Samueli School of Engineering and Applied Science, UCLA. Professor Yang has over 20 years of research and teaching experience in mechanical behavior of metallic and composite materials for aerospace structural and propulsional applications. He has performed research in material processing and process simulation, microstructural characterization and mechanical testing, micromechanical modeling, and life prediction. He received the Presidential Young Investigator’s Award from the National Science Foundation in 1990 as well as the R&D 100 Award. He has been the PI/co-PI for various federal-funded research programs, including NSF, FAA, ARO, AFOSR, NIST, and NASA. Professor Yang has published over 200 technical papers in mechanical behavior of composite materials, high-temperature materials for aerospace structures and nanostructured materials and nanomechanical testing.

Lecturer

Hamid Saghizadeh, PhD, MBA, Boeing Technical Fellow, Boeing IDS, Space and Intelligence Systems (S&IS), El Segundo, California. Dr. Saghizadeh is the focal leader in fracture mechanics/durability and damage tolerance for Boeing S&IS and leads the Fatigue and Fracture Technologies Technical Interest Group for the Boeing Enterprise. He also developed Mechanical and Structural Engineering Knowledge and Technology Management (MSEKM) at Boeing S&IS, is a pioneer in the areas of Elastic-Plastic Fracture Mechanics (EPFM) and fracture of composites, and is recognized as an industry expert in EPFM. In addition to structural analysis, testing, and qualification test requirements, his areas of expertise include fatigue, fracture mechanics, and failure analysis, including mechanism of hydrogen-environment embrittlement, stress corrosion cracking, rupture, and time-dependent failure mechanism. His areas of interest also include nanotechnology, nanomaterials for space applications, virtual testing, and multi-scale modeling.

Dr. Saghizadeh conceived of and developed an innovative and original fatigue virtual testing technology with significant industry impact. He has arrived at a technology concept based on nanotechnology to develop high strength, high stiffness and durable composite materials with significant lower weight for space applications and the related industries. He developed and published 2 original models on fracture of composites, and has made over 200 presentations and over 100 Boeing significant writings.

Course Outlines

Day 1

  1. Sources and characteristics of damage and defects in composite and sandwich structures.
  2. Effects of damage types and their significance to structural integrity and damage tolerance.
  3. Basic issues affecting the selection of repair materials and methods

Day 2

  1. Bonded Repair Process
  2. Bolted Repair Process
  3. Quality control processes for bonded and bolted repairs

Day 3

  1. Composite patch Repair for metal airframes
  2. Repair Analysis and Validation
  3. Nondestructive inspection (NDI) methods used for damage assessment and post-repair inspection (Missing Course and Bios)

For more information contact the Short Course Program Office:
shortcourses@uclaextension.edu (310) 825-3344 | fax (310) 206-2815

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