A 1 kHz servohydraulic fatigue testing system

Conference · Wed Dec 31 04:00:00 EST 1997

OSTI ID:293075

Morgan, J M ^[1]; Milligan, W W ^[2]

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1. MTS Systems Corp., Eden Prairie, MN (United States)
2. Michigan Technological Univ., Houghton, MI (United States). Dept. of Metallurgical and Materials Engineering

High cycle fatigue testing to long lives requires high frequency equipment. For example, a 10{sup 9} cycle test takes over seven months in a traditional 50 Hz servohydraulic testing machine, but only 11 days at 1,000 Hz. In response to these needs, and in order to study frequency and temperature effects in the vibrational loading regime, a servohydraulic system capable of load-controlled testing at 1,000 Hz and high temperature has been developed. This paper describes modifications which are necessary to the load frame and servovalve design, the control algorithms, and the calibration procedures. It also describes an approach to measuring crack opening displacement at high temperature and 1,000 Hz, and some preliminary results.

• Sponsoring Organization: Department of the Air Force, Washington, DC (United States)
• OSTI ID: 293075
• Report Number(s): CONF-970980--; ISBN 0-87339-382-1
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CARBON STEELS
CRACK PROPAGATION
DESIGN
FATIGUE
FREQUENCY DEPENDENCE
HYDRAULIC EQUIPMENT
MATERIALS TESTING
TEST FACILITIES