The research accomplishments under this grant were very extensive in the areas of the high temperature behavior of ceramics, ceramic composites and testing standards for these materials. Rather than try to summarize all this research I have enclosed research papers and reports which were completed with the funding provided by the grant

Hemann, John

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NASA-CR-205319
SUMMARY OF RESEARCH
FINAL REPORT
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Title: High Temperature Mechanical Behavior of Ceramic Matrix composites
Type of report: Final
Name of principal investigator: John Hemann
Period covered by grant: 04/12/89 to 07/14/96
Name and address if the grantee's institution: Cleveland State University
1983 East 24 th St.
Cleveland, Ohio 44115
Grant number: NCC 3-138
https://ntrs.nasa.gov/search.jsp?R=19980008383 2020-06-16T00:32:26+00:00Z
NT CONTROL NO. (Official use only)NEW TECHNOLOGY DISCLOSURE
NASA Task Manager Contractor Task Manager or Grantee Principal Investigator
Johll Hemann liJon Salem
This form is used by NASA contractors, subcontractors, grantees, n,d_gr rite u co ct rs when reporting patentable
and non-patentable inventions, discoveries, improvements or innovations (including computer software) to NASA. Use of
this report form is optional, however, an altemative format must at a minimum contain the information required herein.
When necessary, attach additional documentation to provide a full, detailed description.
t. Ti:LE
High Temperature Mechanical Behavior of Ceramic Matdx Composites
2. INNOVATOR(S) (Name, Social Security No., and Home Address) *
i
3. EMPLOYER (Organization and division)
Cleveland State University
4. ADDRESS (Place of Performance)
1983 East 24thStreet
Cleveland, Ohio 44115
5.NASA PRIME CONTRACT/GRANT NO.
NCC 3-138
6. CONTRACTOR DISCLOSURE NO. and TASK NO.
SECTION I - DESCRIPTION OF THE PROBLEM THAT MOVTIVATED THE TECHYNOLOGY DEVELOPMENT(EnterA.-General
DescriptionfProblemObjective;B.-KeyorUniqueProblemCharacteristics;C.-PastHistory/PriorTechniques;D-LimitationsofPriorTechniques)
NA
NASA FORM 666A (REV.MARCH.1997BY I_,¢RC/CTO} l,
SUMMARY OF RESEARCH
The research accomplishments under this grant were very extensive in the areas of
the high temperature behavior of ceramics, ceramic composites and testing standards for
these materials. Rather than try to summarize all this research I have enclosed research
papers and reports which were completed with the funding provided by the grant. These
papers and reports are listed below.
Choi, S.R. and Salem, J.A., "Strength and Fracture Toughness of Monolithic and SiC
Whisker Reinforced Silicon Nitride," Advanced Composite materials.
Choi, S.R. and Salem, J.A., "Comparison of dynamic fatigue behavior between SiC
whisker-reinforced composite and monolithic silicon nitrides," NASA Tech. Memo.,
103707, 1991.
Salem, J.A., Choi, S.R., Sanders, W.A. and Fox, D.S., "Elevated temperature mechanical
behavior of monolithic and SiC whisker-reinforced silicon nitrides," NASA Tech. Memo.
105245, 1991.
Choi, S.R. and Salem, J.A., "Strength, toughness and R-curve behavior of SiC whisker
reinforced composite Si3N4 with reference to monolithic Si3N4.-Journal of Material
Science, 27, 1992.
Choi, S.R. and Salem, J.A., "Slow crack growth of indent cracks in glass with and without
applied stress," Material Science and Engineering, A149, 1992.
Choi, S.R. and Tikare, V., "Crack healing behavior of hot pressed silicon nitride due to
oxidation," Scripta Metallurgica, 26, 1992.
Choi, S.R., Chulya, A. and Salem, J.A., "Analysis of precracking parameters for ceramic
single-edge-precracked-beam specimens," Fracture Mechanics of Ceramics, 10, 1992.
Salem, J.A., Choi, S.R., Freedman, M.R. and Jenkins, M.G., "Mechanical behavior and
failure phenomenon of an in-situ toughened silicon nitride," Journal of Material Science,
27, 1992.
Choi, S.R., Salem, J.A. and Sanders, W.A., ''Estimation of crack closure stresses for in-situ
toughened silicon nitride with 8 wt% scandia," Journal of the American Ceramic Society,
75, 1992.
Choi, S.R., Chulya, A. and Salem, J.A., "Analysis ofprecracking parameters and fracture
toughness for ceramic single-edge-precracked-beam specimens," NASA Tech. Memo.
105568, 1992.,
Choi, S.R.,Salem,J.A.andHebsur,M.G.,"Evaluationof thefracturetoughnessof Nb-
40AI-8Cr-IW-1Y-0.05Bintermetallicmaterialby indentationtechniques,"Journalof
MaterialScience,28, 1993.
Choi,S.R.andSalem,J.A., "Fracturetoughnessof PMMA as measured with indentation
cracks," Journal of Materials Research, 8, 1993.
Tikare, V. and Choi, S.R., "Combined mode I and mode II fracture of monolithic
ceramics," Journal of the American Ceramic Society, 76, 1993.
Choi, S.R. and Tikare, V., "Crack healing of alumina with a residual glassy phase:
strength, fracture toughness and fatigue," Materials Science and Engineering, A171, 1993.
Choi, S.R. and Salem, J.A., "Thermal Shock Behavior of Silicon Nitride Flexure Beam
Specimens with Indentation Cracks," Journal of the American Ceramic Society, 77, 1994.
Choi, S.R., Salem, J.A. and Palko, J.L., "Comparison of tension and flexure to determine
fatigue life prediction parameters at elevated temperatures," ASTM STP 1201, 1994.
Choi, S.R. and Salem, J.A., "Crack-growth resistance ofin-situ toughened silicon nitride,"
Journal of the American Ceramic Society, 77, 1994.
Choi, S.R. and Salem, J.A., "Error identified as hystersis in flexure testing of advanced
ceramics," Scripta Materialia, 35, 1996.
Choi, S.R. and Salem, J.A., ''Effect of preloading on fatigue strength in dynamic fatigue
testing of ceramic materials at elevated temperatures," Ceramic Engineering Science
Proceedings, 16, 1996.
Choi, S.R. and Salem, J.A., "Preloading technique in dynamic fatigue testing ofgass and
ceramics with an indentator flaw system," Journal of the American Ceramic Society, 79,
1996.
Choi, S.R. and Salem, J.A., "Cyclic fatigue of brittle materials with an indented-induced
flaw system," Material Science and Engineering, A208, 1996.
Choi, S.R., Salem, J.A. and Gyekenyesi, J.P., ''Fatigue strength as a function ofpreloading
in dynamic fatigue testing of glass and ceramics," Transactions of the ASME, 1996.
Choi, S.R., Nemeth, NN., Salem, JA., Powers, L.M. and Gyekenyesi, J.P., "High
temperature slow crack growth of Si3N4 specimens subjected to uniaxial and biaxial
dynamic loading conditions," Ceramic Engineering Science Proceedings, 16, 1996
SECTION II-TECHNICALLY COMPLETE AND EASILY UNDERSTANDABLE DESCRIPTION OF NEW TECHNOLOGY THAT WAS
DEVELOPMED TO SOLVE THE PROBLEM OR MEET THE OBJECTIVE (Enter as appropriate A.-Specific description of item; B.-
State of development; C.-Operation as a unit; D.-Functional operation; E-Supportive theory; F.-Engineedng specification; G.-
Peripheral equipment; H.-Drawings, graphs, etc.; I.-Parts or ingredients lists; and J.-Maintenance, reliability, safety factors)
I SECTION OR NOVEL FEATURES OF THE TECHNOLOGY AND THE RESULTS OF ITS APPLICATIONIll-UNIQUE (ORBENEFITS)(Enter as appropriate A.-Nevel or unique features; B.-Develol_ment or concel0tual proteins; C.-Ol_eratinq characteristics, test data: D.-Anahtsis of capabilities:
SECTION IV-SPECULATION REGARDING USEFUL NON-AEROSPACE APPLICATIONS OF THE INNOVATION OR TECHNOLOGY
on Inue
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techno4ogy. IF NOT TOO BULKY OR DIFFICULT TO REPREODUCE, INCLUDE COPIES WITHTHIS REPORT. For those references or additional
documentation available but NOT included in this report *due to their being nonessential to a basic understanding of the new technology and which may be costly
to reproduce or handle) complete item 1, below)
[] 1. PAPERS, ARTICLES' [] 4. ASSEMBLY/MFG.DRAWINGS [] 7. TEST DATA
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CONSTRUCTED, TESTED, ETC.)
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E. DEGREE OF TECHNOLOGICAL SIGNIFICANCE (Check in your beat judgment the statement which best expresses the degree of technological
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I--I 1. MODIFICATION TO EXISTING TECHNOLOGY [] UBSTANTIAL ADVANCE IN THE ART [] MAJOR BREAKTHROUGH
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SIGNATURES(S) OF INNOVATOR(S) DATE
4.
NASA GRANTEE
NEW TECHNOLOGY REPORT
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Grantee Name
and Address:
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Jotm Hcmann
Cleveland State University
1983 East 24 tb Street
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This Final NT Report is subm/tted immediately following the grant's
technical period of performance.
Cleveland, Ohio 44115
Report Submitted by:
Tel_hone Number:
John Hemann
(216) 687-3630
NASA Grant Title: Hip.h Temoemture Mechanical Behavior of Ceramic Matrix Composites
NASA Grant Number: NCC 3-138
NASA Project Manager: Jon Salem
Grant Completion Date: 07/14/96
Today's Date: 9/5/97
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High Temperature Mechanical Behavior of Ceramic Matrix Composites

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