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Title: In-situ X-ray CT results of damage evolution in L6 ordinary chondrite meteorites

These are slides about in-situ X-ray CT results of damage evolution in L6 ordinary chondrite meteorites. The following topics are covered: mechanical and thermal damage characterization, list of Grosvenor Mountain (GRO) meteorite samples, in-situ x-ray compression test setup, GRO-chipped reference at 0 N - existing cracks, GRO-chipped loaded at 1580 N, in-situ x-ray thermal fatigue test setup, GRO-B14 room temperature reference, GRO-B14 Cycle 47 at 200°C, GRO-B14 Cycle 47 at room temperature, conclusions from qualitative analysis, future work and next steps. Conclusions are the following: Both GRO-Chipped and GRO-B14 had existing voids and cracks within the volume. These sites with existing damage were selected for CT images from mechanically and thermally loaded scans since they are prone to damage initiation. The GRO-Chipped sample was loaded to 1580 N which resulted in a 14% compressive engineering strain, calculated using LVDT. Based on the CT cross sectional images, the GRO-B14 sample at 200°C has a thermal expansion of approximately 96 μm in height (i.e. ~1.6% engineering strain).
Authors:
 [1] ;  [2] ;  [3] ;  [4]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Univ. of Alabama, Huntsville, AL (United States)
  3. Johns Hopkins Univ., Baltimore, MD (United States). Hopkins Extreme Materials Inst.
  4. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States). Nondestructive Characterization Inst.
Publication Date:
OSTI Identifier:
1321441
Report Number(s):
LLNL-TR--694779
TRN: US1700267
DOE Contract Number:
AC52-07NA27344
Resource Type:
Technical Report
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE
Contributing Orgs:
Johns Hopkins Univ., Baltimore, MD (United States)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; CHONDRITES; X RADIATION; CAT SCANNING; TEMPERATURE RANGE 0273-0400 K; TEMPERATURE RANGE 0400-1000 K; DAMAGE; THERMAL FATIGUE; EVOLUTION; THERMAL EXPANSION; CRACKS; STRAINS; COMPRESSION; IMAGES; VOIDS