scholarly journals MECHANISM OF SIZE EFFECT IN QUASI-BRITTLE MATERIALS BY FOCUSING ON THE MICRO-CRACK FORMATIONS

2009 ◽  
Vol 65 (1) ◽  
pp. 216-227
Author(s):  
Mao KURUMATANI ◽  
Kenjiro TERADA
Keyword(s):  
Size Effect ◽  
Brittle Materials

scholarly journals Meso-scale analyses of size effect in brittle materials using DEM

2018 ◽  
Vol 21 (1) ◽  
Author(s):  
J. Suchorzewski ◽  
J. Tejchman ◽  
M. Nitka ◽  
J. Bobiński
Keyword(s):  
Size Effect ◽  
Brittle Materials ◽  
Meso Scale

scholarly journals Size Effect in Crack Spacing of Quasi-brittle Materials

2015 ◽  
Vol 109 ◽  
pp. 390-394 ◽  
Author(s):  
Alessandro Pasquale Fantilli ◽  
Barbara Frigo ◽  
Bernardino Chiaia
Keyword(s):  
Size Effect ◽  
Brittle Materials ◽  
Crack Spacing

Indentation Size Effects in Ductile and Brittle Materials

2013 ◽  
Vol 586 ◽  
pp. 51-54
Author(s):  
Jaroslav Menčík ◽  
Martin Elstner
Keyword(s):  
Size Effect ◽  
Size Effects ◽  
Indentation Size Effect ◽  
Brittle Materials ◽  
Indentation Hardness ◽  
Indentation Size ◽  
Homogeneous Materials

Indentation hardness of homogeneous materials should be constant. However, at very small depths, the apparent hardness often increases with decreasing imprint size. The paper discusses various cases of this indentation size effect in metals and ceramics and explains the extrinsic and intrinsic reasons.

Lattice Discrete Particle Modeling of Size Effect in Slab Scratch Tests

2020 ◽  
Vol 88 (2) ◽  
Author(s):  
Lin Han ◽  
Madura Pathirage ◽  
Ange-Therese Akono ◽  
Gianluca Cusatis
Keyword(s):  
Fracture Mechanics ◽  
Size Effect ◽  
Mixed Mode ◽  
Brittle Materials ◽  
Mixed Mode Fracture ◽  
Compressive Behavior ◽  
Fracture Properties ◽  
Mode Fracture ◽  
Discrete Particle ◽  
Scratch Tests

Abstract For a long time, geomechanicians have used scratch tests to characterize the compressive behavior and hardness of rocks. In recent years, this test has regained popularity in the field of mechanics, especially after a series of publications that highlighted the potential capability of the scratch test to determine the fracture properties of quasi-brittle materials. However, the complex failure mechanisms observed experimentally in scratch tests led to scientific debates and, in particular, raised the question of the size effect. This article intends to provide a better understanding of the problem by using numerical tools and fracture mechanics considerations. To narrow the investigation area, this study focuses on slab scratch tests of quasi-brittle materials and adopts two different numerical methods: (i) the lattice discrete particle model (LDPM) that includes constitutive laws for cohesive fracturing, frictional shearing, and nonlinear compressive behavior, and (ii) the meshless method based on Shepard function and partition of unity (MSPU) implementing linear elastic fracture mechanics (LEFM). The numerical results are further analyzed through Bažant’s size effect law (SEL) with an appropriate mixed-mode fracture criterion. Fracture properties are then calculated and compared to the results of typical notched three-point bending tests. The results show that mixed-mode fracture considerations are of paramount importance in analyzing the fracture process and size effect of scratch tests.

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