An evaluation of data reduction methods for the mixed mode bending test

Srinivas Bhashyam, Barry D. Davidson

Research output: Contribution to conferencePaper

13 Scopus citations

Abstract

Results are presented from a combined numerical and experimental study to assess the accuracy of six different methods of data reduction for the mixed-mode bending test. These include two methods in the literature that use only the load data from the test, a modification to one of these methods to improve accuracy, two variations of compliance calibration, and a newly proposed "load-deflection method." First, the accuracy of the various methods were evaluated by comparison to finite element predictions for a typical laminate. Second, the various methods were applied to double cantilever beam and end-notched flexure test data that had previously been reduced by well-established techniques. These "preliminary studies" were used to obtain the five most accurate methods. Finally, five laminates were tested in the mixed-mode bending fixture at each of five mode ratios: GII/G = 0.2, 0.4, 0.6, 0.8 and 1.0. The data from these tests were reduced by the five data reduction methods. The mean value of critical energy release rate, Gc, at GII/G = 0.4 was compared to the mean Gc obtained by compliance calibration of a separate set of five single leg bending test specimens, and Gc at GII/G =1.0 was compared to the mean Gc obtained by compliance calibration of a separate set of five end-notched flexure test specimens. By these comparisons, by physical considerations of the test results, and by examinations of the standard deviations of the various data pools, it was concluded that a modification to a method that uses only load data from the test is the most accurate. This modification involves only the experimental determination of the bending rigidities of the cracked and uncracked regions and the use of these results in the reduction of data.

Original languageEnglish (US)
Pages886-896
Number of pages11
DOIs
StatePublished - Jan 1 1996
Event37th AIAA/ASME/ASCE/AHS/ASC Structure, Structural Dynamics and Materials Conference, 1996 - Salt Lake City, United States
Duration: Apr 15 1996Apr 17 1996

Conference

Conference37th AIAA/ASME/ASCE/AHS/ASC Structure, Structural Dynamics and Materials Conference, 1996
CountryUnited States
CitySalt Lake City
Period4/15/964/17/96

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Mechanics of Materials
  • Architecture
  • Building and Construction

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    Bhashyam, S., & Davidson, B. D. (1996). An evaluation of data reduction methods for the mixed mode bending test. 886-896. Paper presented at 37th AIAA/ASME/ASCE/AHS/ASC Structure, Structural Dynamics and Materials Conference, 1996, Salt Lake City, United States. https://doi.org/10.2514/6.1996-1419