A comparison of structural frequency response functions measured with forces from 500 to 250,000 lb

Technical Report · Tue Sep 01 04:00:00 EDT 1987

OSTI ID:6037621

Bateman, V I

Modal analysis of structural systems is typically performed at low force levels (10's or 100's of pounds). Often, in their intended use environment, the systems encounter much higher service loads, and linearity of their responses must be assumed. This work describes a technique to dynamically characterize structural systems with force levels in excess of 100 klb. A hollow steel bar (6 in. in dia and 60 in. long) was instrumented with strain gages at an axial distance of 41.25 in. A frequency response function for the bar was determined from the strain gage measurements in response to a transient force of a few hundred pounds. A Reverse Hopkinson Bar technique was used to generate a force input at 150 and 250 klb for the same hollow steel bar. A frequency response function was calculated for this high-force input that simulates a field test environment. The two frequency response functions are compared. 4 refs., 15 figs.

• Research Organization: Sandia National Labs., Albuquerque, NM (USA)
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 6037621
• Report Number(s): SAND-87-0632; ON: DE88000668
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420500* -- Engineering-- Materials Testing
DATA
DYNAMIC LOADS
EXPERIMENTAL DATA
FREQUENCY RESPONSE TESTING
FUNCTIONS
INFORMATION
MEASURING INSTRUMENTS
MECHANICAL STRUCTURES
NUMERICAL DATA
RESPONSE FUNCTIONS
STATIC LOADS
STRAIN GAGES
STRESS ANALYSIS
TESTING