Limited Experimental Displacement Data used for obtaining Full-Field Dynamic Stress Strain Information

Pingle, Pawan; Avitabile, Peter

doi:10.1007/978-1-4419-9305-2_14

Cited by 8 publications

(1 citation statement)

References 12 publications

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“…The strain response is obtained from full-field expanded displacements for all the three sensor configurations discussed in Case 1 using strain recovery process outlined in [10,21,22]. The strain response has been calibrated for static load and discrete sine test.…”

Section: Strain Responsementioning

confidence: 99%

Prediction of Full Field Dynamic Strain from Limited Sets of Measured Data

Avitabile

Pingle

2012

Shock and Vibration

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Dynamic response is an important consideration for design of structures due to operating or occasional loadings. The resulting dynamic stress strain is also of concern for fatigue and structural health monitoring. Typically, the actual loading and structural condition (boundary conditions, environmental condition, geometry, mechanical properties, etc.) are not necessarily known. Much effort is expended in attempting to identify the loads and appropriate model for prediction of these types of events. At best, the forces and actual boundary conditions are approximate and have an effect on the overall predicted response and resulting stress-strain that is identified for subsequent evaluation.Experimental data can only be obtained from limited sets of points, such as those typically collected with accelerometers. These are normally used in the evaluation the state of a structure in service condition. More recently, Digital Image Correlation (DIC) and Dynamic Photogrammetry (DP) have become very important techniques to measure the surface response. These are non-contact and full-field techniques, which allow that much more simultaneous data to be measure. The sets of limited surface data that are collected can be used in conjunction with an expansion algorithm to obtain full field information. The finite element model mass and stiffness matrices are used to obtain the normal constitutive relations as well as the modal characteristics. This information is used to develop the expansion algorithm and for the stress recovery during the back substitution process typically employed.

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Section: Strain Responsementioning

confidence: 99%