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Probabilistic Assessment of Damage from Same Shock Response Spectra due to Variations in Damping
- Source :
- Shock and Vibration, Vol 2020 (2020)
- Publication Year :
- 2020
- Publisher :
- Hindawi Limited, 2020.
-
Abstract
- Interpretation of field data from shock tests and subsequent assessment of product safety margins via laboratory testing are based on the shock response spectra (SRS). The SRS capture how a single degree of freedom (SDOF) structure responds to the shock at differing frequencies and, therefore, no longer contain the duration or other temporal parameters pertaining to the shock. A single duration can often be included in the technical specification or in the recreation of acceleration vs. time history from the specified SRS; however, there is little basis for that beyond technical judgment. The loss of such temporal information can result in the recreated SRS being the same while its effect on a system or component can be different. This paper attempts to quantify this deficiency as well as propose a simple method of capturing damping from shock waves that can allow the original waveform to be more accurately reconstructed from the SRS. In this study the decay rate associated with various frequencies that comprise the overall shock was varied. This variation in the decay rate leads to a variation in the acceleration vs. time history, which can be correlated to a “Damage Index” that captures the fatigue damage imparted to the object under shock. Several waveforms that have the same SRS but varying rates of decay for either high- or low-frequency components of the shock were investigated. The resulting variation in stress cycles and Damage Index is discussed in the context of the lognormal distribution of fatigue failure data. It is proposed that, along with the SRS, the decay rate is also captured to minimize the discrepancy between field data and representative laboratory tests.
- Subjects :
- Shock wave
Article Subject
Physics
QC1-999
Mechanical Engineering
Probabilistic logic
020101 civil engineering
Context (language use)
02 engineering and technology
Mechanics
Geotechnical Engineering and Engineering Geology
Condensed Matter Physics
0201 civil engineering
Shock (mechanics)
Acceleration
020303 mechanical engineering & transports
0203 mechanical engineering
Mechanics of Materials
Shock response spectrum
parasitic diseases
Log-normal distribution
Waveform
Environmental science
Civil and Structural Engineering
Subjects
Details
- ISSN :
- 18759203 and 10709622
- Volume :
- 2020
- Database :
- OpenAIRE
- Journal :
- Shock and Vibration
- Accession number :
- edsair.doi.dedup.....cc5f2fee731502a055dd7427fc5c5169