Miniature Specimen Fracture Toughness Testing: A Concise Review
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Date
2022-07-24
Authors
Azhar, Muhammad Asyraf
Journal Title
Journal ISSN
Volume Title
Publisher
Universiti Sains Malaysia
Abstract
The miniature fracture toughness was done as many issues are brought out, and
one main factor of those is limited available material. The miniature fracture toughness
could provide useful information related to the properties of the material with only use
small part of the material. The thesis provides a technical review of miniature fracture
toughness testing, standardization, and evaluation for metallic materials. The review
discusses the key fracture mechanics parameters for miniature specimen, J-integral,
starting with their fundamentals, and definitions and progressing through the
experimental estimation, test procedures, and ASTM standardization procedures.
Guidelines for selecting a suitable fracture parameter to describe the material's fracture
toughness are discussed, as well as instructions for measuring the value of fracture
toughness defined in a format of resistance curve using laboratory compact tension
specimens. A combined common test standard E1820 for determining J parameters is
the applicable ASTM fracture toughness test standard taken into account in this work.
The method and technique are also discussed in this paper, including the elastic
unloading compliance method and data evaluation and reduction in determining the J
– R curve and estimation of JQ. The review also includes the early studies and most
recent advancements in fracture toughness test techniques and procedures created by
the American Society for Testing and Materials (ASTM). The miniature fracture
toughness testing is reviewed in this thesis with following ASTM E1820 standard and
gave satisfactory results without utilize large panel specimen.