On the Sensitivity of Energy Metrics to Failure in a Complex Structure
Abstract not provided.
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Jump to search filtersWSEAT Shock Testing Margin Assessment Using Energy Spectra Final Report
Several programs at Sandia National Laboratories have adopted energy spectra as a metric to relate the severity of mechanical insults to structural capacity. The purpose being to gain insight into the system's capability, reliability, and to quantify the ultimate margin between the normal operating envelope and the likely system failure point -- a system margin assessment. The fundamental concern with the use of energy metrics was that the applicability domain and implementation details were not completely defined for many problems of interest. The goal of this WSEAT project was to examine that domain of applicability and work out the necessary implementation details. The goal of this project was to provide experimental validation for the energy spectra based methods in the context of margin assessment as they relate to shock environments. The extensive test results concluded that failure predictions using energy methods did not agree with failure predictions using S-N data. As a result, a modification to the energy methods was developed following the form of Basquin's equation to incorporate the power law exponent for fatigue damage. This update to the energy-based framework brings the energy based metrics into agreement with experimental data and historical S-N data.
Using Temporal Moments to Detect Interactions During Simultaneous Shock Testing of Multiple Components
Abstract not provided.
ON THE SENSITIVITY OF ENERGY METRICS TO FAILURE TYPES IN A COMPLEX STRUCTURE
Abstract not provided.
Using Temporal Moments to Detect Interactions During Simultaneous Shock Testing of Multiple Components
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AN AUTOMATED METHOD TO IDENTIFY OUTLIER SENSOR RESPONSE
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6-DOF Mechanical Shock Failure Predictions of a Cantilever Structure Using Energy Response Spectra Methods
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Energy Based Representation of 6-DOF Shaker Shock Low-Cycle Fatigue Tests
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6-DOF Mechanical Shock Failure Predictions of a Cantilever Structure Using Energy Response Spectra Methods
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An automated method to identify outlier sensor response
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Mechanical Shock Failure Predictions of a Cantilever Structure Using Energy Response Spectra Methods
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Energy Based Representations of Mechanical Shock for Failure Characterization
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Mechanical Shock Failure Predictions of a Cantilever Structure Using Energy Response Spectra Methods
Abstract not provided.
Energy based representations of mechanical shock for failure characterization
57th AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference
The relationship between the damage potential of a series of relatively low level shocks and a single high level shock that causes severe damage is complex and depends on many factors. Shock Response Spectra are the standard for describing mechanical shock events for aerospace vehicles, but are only applicable to single shocks. Energy response spectra are applicable to multiple shock events. This paper describes the results of an initial study that sought to gain insight into how energy response spectra of low amplitude shocks relate to energy response spectra of a high amplitude shock in which the component of interest fails. The study showed that maximum energy spectra of low level shocks cannot simply be summed to estimate the energy response spectra of a high level, failure causing single shock. A power law relationship between the energy spectra of a low amplitude shock and the energy spectra of the high amplitude shock was postulated. A range of values of the exponent was empirically determined from test data and found to be consistent with the values typically used in high-cycle fatigue S-N curves.
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