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Title: APPLYING DIGITAL IMAGE CORRELATION TO UNIDIRECTIONAL COMPOSITE IOSIPESCU SHEAR TEST SPECIMENS

Authors:
 [1];  [1]
  1. Los Alamos National Laboratory
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1321689
Report Number(s):
LA-UR-07-2334
DOE Contract Number:
AC52-06NA25396
Resource Type:
Conference
Resource Relation:
Conference: SOCIETY FOR EXPERIMENTAL MECHANICS (SEM) ANNUAL CONFERENCE ; 200706 ; SPRINGFIELD
Country of Publication:
United States
Language:
English

Citation Formats

BROWN, ERIC N., and LIU, CHENG. APPLYING DIGITAL IMAGE CORRELATION TO UNIDIRECTIONAL COMPOSITE IOSIPESCU SHEAR TEST SPECIMENS. United States: N. p., 2007. Web.
BROWN, ERIC N., & LIU, CHENG. APPLYING DIGITAL IMAGE CORRELATION TO UNIDIRECTIONAL COMPOSITE IOSIPESCU SHEAR TEST SPECIMENS. United States.
BROWN, ERIC N., and LIU, CHENG. Mon . "APPLYING DIGITAL IMAGE CORRELATION TO UNIDIRECTIONAL COMPOSITE IOSIPESCU SHEAR TEST SPECIMENS". United States. doi:. https://www.osti.gov/servlets/purl/1321689.
@article{osti_1321689,
title = {APPLYING DIGITAL IMAGE CORRELATION TO UNIDIRECTIONAL COMPOSITE IOSIPESCU SHEAR TEST SPECIMENS},
author = {BROWN, ERIC N. and LIU, CHENG},
abstractNote = {},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Apr 09 00:00:00 EDT 2007},
month = {Mon Apr 09 00:00:00 EDT 2007}
}

Conference:
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  • This research involves the development of an analysis which yielded recommendations regarding the plate thickness at which the effects of transverse shear become significant enough to be taken into consideration during vibration testing of composite plates. The specimens designed using this analysis are to be used for the {open_quotes}inverse{close_quotes} problem of determining through-the-thickness elastic constants as well as in-plane elastic constants from modal vibration response data. The effects of transverse shear were studied over the range of practical plate aspect ratios (length to thickness ratios) and mode numbers. Behavior of composite plates ranging from isotropic to highly orthotropic was studiedmore » in order to investigate the effects of transverse shear. Orthotropic plates having in-plane dimensions of 254 x 254 mm and thicknesses varying from 10 mm to 80 mm, with free-free edge boundary conditions, were considered. A methodology was developed to use Finite Element Analysis (FEA) to compare with the results of closed form analytical models. Good agreement between the two analytical models was observed, and graphs were generated for determination of best plate aspect ratios and mode numbers. Keywords: composite plate, transverse shear, elastic constants, vibrations, finite element analysis.« less
  • Four different shear test methods i.e. doubled notched shear test, asymmetrical four point bend test, Iosipescu test, and torsion test, were investigated for their ability to evaluate one standard SiC to SiC ceramic brittle joint while using small size specimens. Double notched shear test showed higher stress concentration at the notch base and a lower nominal shear strength. Both asymmetrical four point bend test and Iosipescu test utilized epoxy jointed metal extensors, which failed during test and caused misalignment and tensile type of failure. Torsion test can deliver true shear loading. However, base material failure was observed for the torsionmore » joint samples in this study. None of the tests can successfully induce true shear failure of the joint because the joint is stronger and tougher than the SiC substrate. Torsion test appears to be promising because of the pure shear loading, less stress concentration, and easy alignment.« less
  • No abstract prepared.
  • The results of a series of punch-through tests performed on steel plates are presented. The geometry consisted of circular plates with welded boundary condition penetrated by a conical shaped punch with either a radiused or flat cylindrical end. After initial failure, the conical portion of the punch was driven through the plate to exercise tearing mechanics. Tests were performed quasi-statically with a hydraulic actuator and dynamically using a high-capacity drop table. Deformation and strain were measured with a stereo DIC system. The quasi-static tests utilized a conventional direct-view DIC technique while the dynamic tests required development of an indirect-view techniquemore » using a mirror. Experimental details used to conduct the test series will be presented along with test results. Methods of assessing test-to-test repeatability will be discussed. DIC results will also be synchronized and compared with transducer data (displacement and strain).« less