About Dr. Hamstad

Dr. Hamstad has been continuously involved in acoustic emission research and applications since 1971, and he has carried out AE projects in the USA, Germany, and Sweden. His various research efforts have resulted in more than 100 publications. Topics covered in Dr. Hamstad's published acoustic emission work include: composites (graphite/epoxy, kevlar/epoxy, glass/epoxy, and wood);unflawed metals (aluminum alloys, steels, stainless steel); flawed metals (aluminum alloys, steels); ceramics (both flawed and unflawed); wave propagation (experimental and finite element modeling); acoustic emission instrumentation characterization; acoustic emission sensor/preamplifier design and characterization; and, fatigue monitoring of materials (metals and composites). Dr. Hamstad is also an associate editor of the international journal Structural Health Monitoring and on the editorial board of the Journal of Acoustic Emission.

Dr. Hamstad completed his Ph.D. in Mechanical Engineering/Solid Mechanics at the University of California, Berkeley, CA, USA in 1971. From 1971 to 1984 his AE research and development efforts were carried out at Lawrence Livermore National Laboratory (LLNL; Livermore, CA, USA). Lawrence Livermore was one of the "birthplaces" of acoustic emission technology in the United States. From 1984 to the present, Dr. Hamstad has continued his acoustic emission work at the University of Denver (Denver, CO, USA). The University of Denver also has a long history in acoustic emission, starting in the late 1960s under the leadership of Dr. Steve Carpenter. Since 1992, Dr. Hamstad has also had various associations with the Materials Reliability Division of the National Institute of Standards and Technology (NIST; Boulder, CO, USA). Dr. Hamstad initiated and developed an acoustic emission research program at NIST which emphasizes wideband waveform-based acoustic emission. Dr. Hamstad has also provided key leadership as chairman of the CARP (Committee on Acoustic Emission from Reinforced Plastics) Division of the American Society for Nondestructive Testing. He completed sixteen years as CARP chairman in 1999. During his tenure as CARP chairman, he initiated the Acoustic Emission from Composite Materials (AECM) international symposium series which started in 1983 and continued at four additional sites in 1986, 1989, 1992, 1995 and 1998. Dr. Hamstad's research has covered many areas of acoustic emission technology ranging from nondestructive testing (NDT) applications to materials characterization. He also developed production NDT applications for acoustic emission while at LLNL.

Entities Who Have Funded Research and Development Through Dr. Hamstad's Places of Employment
  • US Air Force
  • US Department of Transportation
  • US Department of Agriculture
  • US Army Aviation Research and Development Command
  • Adolph Coors Company
  • Alcoa Laboratories
  • Lawrence Livermore National Laboratory
  • Boeing Commercial Airplanes
  • A Department of Energy Facility
  • European Space Agency
Entities Who Have Contracted Research and Development Directly Through Dr. Hamstad As An Independent Technical Consultant
  • Multiple Major Aerospace Contractors
  • A Chemical Processing Corporation
  • A Medical Device Research/Manufacturing Company
  • Multiple Department of Energy Facilities
  • A Nuclear Safety Inspection Company
  • A Major University Civil Engineering Department
  • A Combination of Law Firm/Insurance Company/Major Corporation (Technical expert for significant lawsuit)
Contact

Dr. Hamstad would be interested in contacts regarding specific funded (through the University of Denver) acoustic emission research projects, and where appropriate specific paid consultation on acoustic emission applications.

You may contact Dr. Hamstad at his email address mhamstad@du.edu

Acoustic Emission Primer

View a lecture delivered by Dr. Hamstad at the Acoustic Emission Working Group meeting on August 4, 2003 (AEWG-46). This meeting was hosted at Portland State University and given in PSU's Distance Learning Center.
The following topics are discussed at (approximately) the elapsed time indicated. The selection control on the media player may be adjusted appropriately to view selected portions of the lecture.


TopicTime


Introduction To Fiber Composite Materials/ Mechanical Properties0:00
AE as Related to Composite Mechanical Properties and Microstructure4:50
NDE and Fiber Composites-General and Compared to Metals NDE12:50
Summary: Non-Aerospace Applications of AE to Fiber Composites28:00
Differences Aerospace vs. Non-Aerospace Composites, Definitions of terms FR, SR, Static Fatigue31:00
State of Art Example: NDE for an Aerospace Composite Structure45:20
Questions57:00
Material Characterization (the second main AE application) by AE from Formation of the Characteristic Damage State in Most of the Examples1:04:00
Keys to Success in NDE Composites Using AE1:29:07

View the AE Primer
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