Finding the fracture toughness characteristics of graphite materials in plane strain

Brittle fracture of U-notched graphite plates under mixed mode loading

“…The thickness of the specimens was chosen following the guidelines drawn in Refs. [39,40] with the aim to assure plane strain conditions at the notch tip.…”

Brittle failure of inclined key‐hole notches in isostatic graphite under in‐plane mixed mode loading

“…Fracture behaviour of cracked components made of graphite or graphite composites has been widely investigated, [54][55][56][57][58][59][60] but only a very limited number of papers deal with specimens weakened by U or V notches.…”

Review of local strain energy density theory for the fracture assessment of V-notches under mixed mode loading

“…Since the strategic importance of this variable, several researchers have tried to determine the fracture toughness of polycrystalline graphite under mode I or under mixed mode tensile-shear loading conditions (e.g. Yamauchi et al, 2000Yamauchi et al, , 2001Wang & Liu, 2008;Etter et al, 2004;Yum & You, 2001;Wosu et al, 2005;Jurf & Pipes, 1982;Latella & Liu, 2006;Sato et al, 1978Sato et al, , 1981Knibbs, 1967;Allard et al, 1991;Burchell, 1996;Lomakin et al, 1975;Losty, 1962;Greenstreet, 1968;Greenstreet et al, 1969;Aliha et al, 2015a;Nemeth, 2011;Mostafavi et al, , 2013aMostafavi et al, , 2013b. Especially Awaji and Sato (1978), Li et al (1999), Yamauchi et al (2000Yamauchi et al ( , 2001, and Shi et al (2008) conducted a large number of tests to determine fracture toughness under mode I and mixed mode I+II with different cracked specimens.…”

“…Several researchers have pushed their efforts in this direction (e.g. Knibbs, 1976;Allard et al, 1991;Burchell, 1996;Lomakin et al, 1975;Losty, 1962;Greenstreet, 1968;Greenstreet et al, 1969;Nemeth, 2011;Mostafavi & Marrow, 2011Bahmani et al, 2017;Akbardoost, 2014;Mirsayar et al, 2016). Among them, a well-known theory was proposed by Burchell (1996).…”

“…It relates brittle fracture of graphite to the crack nucleation and the subcritical crack growth from pre-existing pores under the influence of the stress field related to the pores or defects. Lomakin et al (1975) instead, through an energy release rate criterion, analyzed the fracture initiation in cracked graphite specimens under mode I loading. Recently, some works on three-dimensional crack propagation in poly-granular graphite have been published (Mostafavi et al, 2013a(Mostafavi et al, , 2013b.…”