Analysis Of Strain Dependent Damping In Metals Via Modeling Of Material Point Hysteresis

Item

Title
Analysis Of Strain Dependent Damping In Metals Via Modeling Of Material Point Hysteresis
Report Number
WL-TR-91-3078 Volume III, p. ICC-1 thru ICC-25
Creator
Graesser, Edward J.
Wong, Catherine R.
Corporate Author
David Taylor Research Center, Ship Materials Engineering Department
Date
1991
Date Issued
1991-08
Extent
25
Identifier
ADA241313
Format
1 online resource
Abstract
In strain dependent ( or nonlinear) high damping metals, measured values of damping vs.
strain are often inconsistent for different damping test configurations. To better understand the
nature of such inconsistencies shear and bending test configurations were modeled analytically.
A hysteretic material point stress-strain relationship was used for each modeling configuration.
This model is similar to established constitutive laws of viscoplastic behavior and has been
adapted especially for the study of nonlinear hysteresis and the problem of strain dependent
damping. Analytical material response analyses of bending and torsion samples indicated that
when the damping of a single nonlinear material is plotted against the one-dimensional local
strain of the sample, highly discrepant results are produced. However, when the same results are
plotted against an invariant measure of three-dimensional local distortion the agreement
improves considerably. The method can also be applied to homogeneous isotropic nonlinear
damping materials that are not metallic (such as amorphous nonlinear high damping polymers).
Description
In strain dependent ( or nonlinear) high damping metals, measured values of damping vs.
strain are often inconsistent for different damping test configurations. To better understand the
nature of such inconsistencies shear and bending test configurations were modeled analytically.
A hysteretic material point stress-strain relationship was used for each modeling configuration.
This model is similar to established constitutive laws of viscoplastic behavior and has been
adapted especially for the study of nonlinear hysteresis and the problem of strain dependent
damping. Analytical material response analyses of bending and torsion samples indicated that
when the damping of a single nonlinear material is plotted against the one-dimensional local
strain of the sample, highly discrepant results are produced. However, when the same results are
plotted against an invariant measure of three-dimensional local distortion the agreement
improves considerably. The method can also be applied to homogeneous isotropic nonlinear
damping materials that are not metallic (such as amorphous nonlinear high damping polymers).
Distribution Classification
1
Distribution Conflict
No
DTIC Record Exists
No
Illinois Tech Related
No
Photo Quality
Not Needed
Report Availability
Full text available
Type
article
Media
artcileICC

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Items with "Has Part: Analysis Of Strain Dependent Damping In Metals Via Modeling Of Material Point Hysteresis"
Title Class
Proceedings of Damping '91: 13-15 February 1991 San Diego, California (GCA-1 through JCB-17)