WENNER-GREN RESEARCH LAB F/6 ~J OF VERTEBRAL D WSRL32

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KENTUCKUYNIV LEXINGTONWENNER-GRERNESEARCHLAB

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~J DYNAMICRESPONSOEF VERTEBRALELEM4ENTRSESPONSOEF THE INTERVER--ETCCU)

FEB B2 F LAFFERTY, D A BOWMAN

AFOSR-78-3488

UNCLASSIFIED WSRL32-

AFOSA-R-8A2O2

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MICROCOPY RESOLUTION TEST CHART NATIONALBUREAU OF STANDARDS1963-A

SECURITY CLASSIFICATION OF r -IS-PAGE 'hen not* Enlered)

REP"ORT DOCUMENTAYION PAGE

RE;ORTFOR

BEfROERAED IINNSSTTRRUUCTTIOIONNSS " COMPLET!~r, FOR3U1

RR.EFoRT NUMBER

V. ?OVT ACCESSION NO. 3. RECIPIENT'S CATALOG NUMBER

EAFSR-TR- TITLE (and Subtitle)

8 2 - 0 420

-, /<

5. TYPE OF REPORT & PERIOD C

DYNAMIC RESPONSE OF VERTEBRAL ELEMENTS

Annual

2

Response of the Intervertebral Joint to

1 JAN 81 - 31 DEC 81

Torsion 7. AUTNOR s

J. F. Lafferty, D. A. Bowman

6. PERFORMING ORG. REPORT NUMBER

8. CONTRACT OR GRANT NUMBER~e) AFOSR 78-3488

I. PERFORMING ORGANIZATION NAME AND ADDRESS

Wenner-Gren Research Laboratory

10. PROGRAM ELEMENT. PROJECT, TASK AREA & WORK UNIT NUMBERS

Biomedical Engineering Center

2312/A2

University of Kentucky, Lexington, KY 40506

NOW-

i.

CONTROLLING OFFICE NAME AND ADDRESS

12. REPORT DATE

Air Force Office of Scientific Research

82 FEB 24

Building 410 (NQ

Bolling AFB, DC 20332

14. MONITORING AGENCY NAME & ADORESS(f dillerenl irom Controlilng Office)

13. NUMBEROFPAGES

10

IS. SECURITY CLASS. (of thle report)

16. OI&TRIBUTION STATEMENT (of tle Reporl,)

iSa. DECL ASSI ICATION/ DOWNGRADING SCHEDULE

Approved fv-'-'> distribution

ro16aso; I!-.11imited.

I7. DISTRIBUTION STATEMENT (of Ih abetract entered In Block 20. II dliferent Irom Report)

IS. SUPPLEMENTARY NOTES

Material in this report to be presented at the First Southern Biomedical Engineering Conference, Shreveport, Louisiana, June 7-8, 1982.

IS. KEY WORDS (Continue on reverse side it necessary and Identity by black number)

Intervertebral Joint, Torsion, Viscoelastic Model

D

20. ABSTRACT (Continue on reverse side It necessary and Identity by block number)

?Creep response obtained from torsional stress tests of the intervertebral

I.lJ

joint are used to develop an analytical model. A series chain of four

..I. Kelvin units was found to provide an excellent representation of the

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viscoelastic properties of the material.

DD I AN*,3 1473 EDITION Or I NOV GS IS OBSOLETE

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SECJRITY CLASSIFI ATION OF THIS PAGE (Whon Dare tntered!)

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11

DYNAMIC RESPONSE OF VERTEBRAL ELEMENTS

Response of the Intervertebral Joint So orsto)'

J.FL.affert

D. A. Scum

Wenner-Gregi Aeronautical Re a4.4"~~rb LexinUgntoivne,rsKiteyntuocfkyKea4t5ciJ February. 1962

11

IIPreared

AWAML UEPRT JAN 19B]-31 OC1961

for

Air Force Office of Sc~ion

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Report WGRL-82-1

DYNAMIC RESPONSE OF VERTEBRAL ELEMENTS Response of the Intervertebral Joint to Torsion

J. F. Lafferty D. A. Bowman

Wenner-Gren Aeronautical Research Laboratory University of Kentucky

Lexington, Kentucky 40506

February, 1982

ANNUAL REPORT Grant AFOSR-78-3488 1 JAN 1981 - 31 DEC 1981

Prepared for Air ForBcoellOifnfgiceAFoB,f i.enti2f0i3c32 Research

Accession For

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Avail.ability Codes

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1A1I0)BTICEI

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This1 technical report has been reviewed and Is

approved f'or publ ic re1lease 1AW AR 190-12.

Distribution is unlimited.

MATT=l 3. INPS Chief, t ebnloal Informtlon)ftlas

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