Modeling of transformation toughening in brittle materials

Conference · Thu Jan 23 23:00:00 EST 1992

DOI:https://doi.org/10.1016/0921-5093(92)90333-V· OSTI ID:5718653

LeSar, R; Rollett, A D ^[1]; Srolovitz, D J ^[2]

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1. Los Alamos National Lab., NM (United States)
2. Michigan Univ., Ann Arbor, MI (United States). Dept. of Materials Science and Engineering

Results from modeling of transformation toughening in brittle materials using a discrete micromechanical model are presented. The material is represented as a two-dimensional triangular array of nodes connected by elastic springs. Microstructural effects are included by varying the spring parameters for the bulk, grain boundaries, and transforming particles. Using the width of the damage zone and the effective compliance (after the initial creation of the damage zone) as measures of fracture toughness, we find that there is a strong dependence of toughness on the amount, size, and shape of the transforming particles, with the maximum toughness achieved with the higher amounts of the larger particles.

• Research Organization: Los Alamos National Lab., NM (United States)
• Sponsoring Organization: DOE; DOD; USDOE, Washington, DC (United States); Department of Defense, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 5718653
• Report Number(s): LA-UR-92-371; CONF-9111115--5; ON: DE92008444; CNN: AFOSR-90-0112
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360203* -- Ceramics
Cermets
& Refractories-- Mechanical Properties
CHALCOGENIDES
CRYSTAL STRUCTURE
FRACTURE PROPERTIES
GRAIN SIZE
MECHANICAL PROPERTIES
MICROSTRUCTURE
MOLYBDENUM COMPOUNDS
MOLYBDENUM SILICIDES
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
REFRACTORY METAL COMPOUNDS
SILICIDES
SILICON COMPOUNDS
SIZE
TRANSITION ELEMENT COMPOUNDS
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES