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

Coordinator and Lecturer: Professor Jenn-Ming Yang

Professor Yang is currenty the Associate Dean at the Henry Samueli School of Engineering and

Applied Science, UCLA.  He’s also a Professor in the Department of Materials Science and Engineering at UCLA.  Prof. Yang has over 30 years of experience in research and teaching in advanced composite materials for aerospace structural and propulsional applications.   He also has extensive experience in teaching composites-related training courses for Boeing and Northrop-Grumman through various UCLA Extension programs.


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

  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
  4. Bonded repair process
  5. Bolted repair process
  6. Quality control processes for bonded and bolted repairs
  7. Composite patch repair for metal airframe
  8. Repair analysis and validation

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