Applicability of fracture toughness concept to fracture behavior of carbon/carbon composites

Hiroshi Hatta, Yasuo Kogo, Hideyuki Asano, Hiroyuki Kawada

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Carbon/Carbon (C/C) composites have attractive mechanical properties such as superior specific strength and high elastic modulus at high temperature exceeding 2 000°C in an inert atmosphere. However, mainly due to lack of knowledge of design criteria, C/C composites have not been used in primary heat resistant structures. For example, almost no unified explanation has been given about fracture behavior of C/C composites. The objective of this paper is to examine whether the linear elastic fracture mechanics (LEFM) is able to be applied to a C/C composite. The LEFM is tried to apply to fracture behavior in tensile tests of the double-edge-notched and compact tension specimens and in the four-point bending test of the single-edge-notched specimens. It was found that the results of three kinds of fracture tests can be consistently and rationally explained by the LEFM concept with the aid of tf-curve behavior if the pre-crack length is long enough to be able to neglect the notch tip radius. From fractographic observation it was found that R-curve behavior of the C/ C composite was mainly attributed to the fiber-bridging effect near the notch tip.

Original languageEnglish
Pages (from-to)897-903
Number of pages7
JournalNihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A
Volume64
Issue number620
Publication statusPublished - 1998
Externally publishedYes

Fingerprint

Carbon carbon composites
Fracture toughness
Fracture mechanics
Bending tests
Elastic moduli
Cracks
Mechanical properties
Fibers
Composite materials
Temperature

Keywords

  • Composite material
  • Fracture criterion
  • Fracture toughness
  • Net section stress
  • Point-stress criterion
  • R-Curve behavior
  • Stress intensity factor

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Materials Science(all)

Cite this

Applicability of fracture toughness concept to fracture behavior of carbon/carbon composites. / Hatta, Hiroshi; Kogo, Yasuo; Asano, Hideyuki; Kawada, Hiroyuki.

In: Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A, Vol. 64, No. 620, 1998, p. 897-903.

Research output: Contribution to journalArticle

@article{c5674d0a8fd34721995b103bc2fb86cf,
title = "Applicability of fracture toughness concept to fracture behavior of carbon/carbon composites",
abstract = "Carbon/Carbon (C/C) composites have attractive mechanical properties such as superior specific strength and high elastic modulus at high temperature exceeding 2 000°C in an inert atmosphere. However, mainly due to lack of knowledge of design criteria, C/C composites have not been used in primary heat resistant structures. For example, almost no unified explanation has been given about fracture behavior of C/C composites. The objective of this paper is to examine whether the linear elastic fracture mechanics (LEFM) is able to be applied to a C/C composite. The LEFM is tried to apply to fracture behavior in tensile tests of the double-edge-notched and compact tension specimens and in the four-point bending test of the single-edge-notched specimens. It was found that the results of three kinds of fracture tests can be consistently and rationally explained by the LEFM concept with the aid of tf-curve behavior if the pre-crack length is long enough to be able to neglect the notch tip radius. From fractographic observation it was found that R-curve behavior of the C/ C composite was mainly attributed to the fiber-bridging effect near the notch tip.",
keywords = "Composite material, Fracture criterion, Fracture toughness, Net section stress, Point-stress criterion, R-Curve behavior, Stress intensity factor",
author = "Hiroshi Hatta and Yasuo Kogo and Hideyuki Asano and Hiroyuki Kawada",
year = "1998",
language = "English",
volume = "64",
pages = "897--903",
journal = "Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A",
issn = "0387-5008",
publisher = "Japan Society of Mechanical Engineers",
number = "620",

}

TY - JOUR

T1 - Applicability of fracture toughness concept to fracture behavior of carbon/carbon composites

AU - Hatta, Hiroshi

AU - Kogo, Yasuo

AU - Asano, Hideyuki

AU - Kawada, Hiroyuki

PY - 1998

Y1 - 1998

N2 - Carbon/Carbon (C/C) composites have attractive mechanical properties such as superior specific strength and high elastic modulus at high temperature exceeding 2 000°C in an inert atmosphere. However, mainly due to lack of knowledge of design criteria, C/C composites have not been used in primary heat resistant structures. For example, almost no unified explanation has been given about fracture behavior of C/C composites. The objective of this paper is to examine whether the linear elastic fracture mechanics (LEFM) is able to be applied to a C/C composite. The LEFM is tried to apply to fracture behavior in tensile tests of the double-edge-notched and compact tension specimens and in the four-point bending test of the single-edge-notched specimens. It was found that the results of three kinds of fracture tests can be consistently and rationally explained by the LEFM concept with the aid of tf-curve behavior if the pre-crack length is long enough to be able to neglect the notch tip radius. From fractographic observation it was found that R-curve behavior of the C/ C composite was mainly attributed to the fiber-bridging effect near the notch tip.

AB - Carbon/Carbon (C/C) composites have attractive mechanical properties such as superior specific strength and high elastic modulus at high temperature exceeding 2 000°C in an inert atmosphere. However, mainly due to lack of knowledge of design criteria, C/C composites have not been used in primary heat resistant structures. For example, almost no unified explanation has been given about fracture behavior of C/C composites. The objective of this paper is to examine whether the linear elastic fracture mechanics (LEFM) is able to be applied to a C/C composite. The LEFM is tried to apply to fracture behavior in tensile tests of the double-edge-notched and compact tension specimens and in the four-point bending test of the single-edge-notched specimens. It was found that the results of three kinds of fracture tests can be consistently and rationally explained by the LEFM concept with the aid of tf-curve behavior if the pre-crack length is long enough to be able to neglect the notch tip radius. From fractographic observation it was found that R-curve behavior of the C/ C composite was mainly attributed to the fiber-bridging effect near the notch tip.

KW - Composite material

KW - Fracture criterion

KW - Fracture toughness

KW - Net section stress

KW - Point-stress criterion

KW - R-Curve behavior

KW - Stress intensity factor

UR - http://www.scopus.com/inward/record.url?scp=0000087371&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0000087371&partnerID=8YFLogxK

M3 - Article

VL - 64

SP - 897

EP - 903

JO - Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A

JF - Nihon Kikai Gakkai Ronbunshu, A Hen/Transactions of the Japan Society of Mechanical Engineers, Part A

SN - 0387-5008

IS - 620

ER -