Volume change of heterogeneous quasi-brittle materials in uniaxial compression

2006 ◽  
Vol 21 (3) ◽  
pp. 162-167 ◽  
Author(s):  
Wang Xuebin
Keyword(s):  
Uniaxial Compression ◽  
Volume Change ◽  
Brittle Materials

scholarly journals Fracture of brittle materials under uniaxial compression

2018 ◽  
Vol 13 ◽  
pp. 976-981
Author(s):  
Mina Iskander ◽  
Nigel Shrive
Keyword(s):  
Uniaxial Compression ◽  
Brittle Materials

Discussions on Fracture Factors of Brittle Materials under the Shear-Compression Condition

2011 ◽  
Vol 250-253 ◽  
pp. 90-94
Author(s):  
Zhi Hui Li ◽  
Jun Ping Shi ◽  
An Min Tang
Keyword(s):  
Shear Stress ◽  
Stress State ◽  
Uniaxial Compression ◽  
Frictional Force ◽  
Shear Fracture ◽  
Maximum Shear Stress ◽  
Brittle Materials ◽  
Fracture Mechanisms ◽  
Initiation Point ◽  
Fracture Angle

Based on fundamental ideas in tribology and basic concept of stress state in solid mechanics, the existence of frictional force on shear plane is discussed under uniaxial compression of brittle materials. On account of macroscopic fracture forms and mesoscopic fracture mechanisms, the key factors influencing shear fracture angle are analyzed. The results show that, when brittle materials are compressed and shear fracture occurs, shear fracture surface at the crack initiation point is consistent with the maximum shear stress. But the reason of shear fracture angle examined in experiment greater than 45º lies in that, the existence of frictional force between endface of specimen and pressure head of testing machine, and additional tensile stress produced in the materials when harder crystalline grain wedge in softer medium have changed original uniaxial compression stress state and the direction of maximum shear stress on next fracture path.

Mechanisms of 3-D Internal Cracks Growth and Coalescence in PMMA

2011 ◽  
Vol 130-134 ◽  
pp. 3912-3915
Author(s):  
Ming Li Wang ◽  
Xiu Yang
Keyword(s):  
Uniaxial Compression ◽  
Boundary Effect ◽  
Failure Mechanisms ◽  
Brittle Materials ◽  
Mechanical Method ◽  
Different Shapes

Several experiments undertaken on cement and mortar samples with internal cracks of different shapes and sizes demonstrated that 3-D cracks growth in compression was qualitatively different from the 2-D cases. This paper employs pre-existing cracks in frozen PMMA（polymethylmethacrylate plastic） which are produced by the mechanical method to analyze the evolution of the boundary effect of PMMA and to study the mechanisms of cracks growth and coalescence. In the experiments, 3-D cracks are tested under uniaxial compression and finally draw two conclusions about failure mechanisms of PMMA and brittle materials.

scholarly journals Damage Function of a Quasi-Brittle Material, Damage Rate, Acceleration and Jerk during Uniaxial Compression: Model and Application to Analysis of Trabecular Bone Tissue Destruction

Symmetry ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 1759
Author(s):  
Gennady Kolesnikov
Keyword(s):  
Trabecular Bone ◽  
Bone Tissue ◽  
Uniaxial Compression ◽  
Brittle Material ◽  
Brittle Materials ◽  
Practical Interest ◽  
Damage Function ◽  
Rate Acceleration ◽  
Damage Process ◽  
Trabecular Bone Tissue

A diversity of quasi-brittle materials can be observed in various engineering structures and natural objects (rocks, frozen soil, concrete, ceramics, bones, etc.). In order to predict the condition and safety of these objects, a large number of studies aimed at analyzing the strength of quasi-brittle materials has been conducted and presented in publications. However, at the modeling level, the problem of estimating the rate and acceleration of destruction of a quasi-brittle material under loading remains relevant. The purpose of the study was to substantiate the function of damage to a quasi-brittle material under uniaxial compression, determine the rate, acceleration and jerk of the damage process, and also to apply the results obtained to predicting the destruction of trabecular bone tissue. In accordance with the purpose of the study, the basic concepts of fracture mechanics and standard methods of mathematical modeling were used. The proposed model is based on the application of the previously obtained differentiable damage function without parameters. The results of the study are presented in the form of plots and analytical relations for computing the rate, acceleration and jerk of the damage process. Examples are given. The predicted peak of the combined effect of rate, acceleration and jerk of the damage process are found to be of practical interest as an additional criterion for destruction. The simulation results agree with the experimental data known from the available literature.

Fracture of brittle materials in uniaxial compression

1978 ◽  
Vol 13 (2) ◽  
pp. 455-457 ◽  
Author(s):  
A. De S. Jayatilaka ◽  
K. Trustrum
Keyword(s):  
Uniaxial Compression ◽  
Brittle Materials

Continuum fracture mechanics of uniaxial compression on brittle materials

1998 ◽  
Vol 35 (31-32) ◽  
pp. 4313-4335 ◽  
Author(s):  
Ioannis Vardoulakis ◽  
Joseph F. Labuz ◽  
Euripides Papamichos ◽  
Johan Tronvoll
Keyword(s):  
Fracture Mechanics ◽  
Uniaxial Compression ◽  
Brittle Materials ◽  
Continuum Fracture Mechanics

scholarly journals Features of the volume change and a new constitutive equation of hydrogels under uniaxial compression

2018 ◽  
Vol 85 ◽  
pp. 181-187 ◽  
Author(s):  
Y.R. Zhang ◽  
K.J. Xu ◽  
Y.L. Bai ◽  
L.Q. Tang ◽  
Z.Y. Jiang ◽  
...  
Keyword(s):  
Constitutive Equation ◽  
Uniaxial Compression ◽  
Volume Change

Numerical Analysis of Crack Propagation in Brittle Materials under Uniaxial Compression

2012 ◽  
Vol 463-464 ◽  
pp. 119-122
Author(s):  
Xi Xi Guo ◽  
Zhao Bin Su
Keyword(s):  
Numerical Analysis ◽  
Friction Coefficient ◽  
Crack Propagation ◽  
Uniaxial Compression ◽  
Brittle Materials ◽  
Singular Element ◽  
Linear Elastic ◽  
Good Shape ◽  
Elastic Fracture ◽  
Friction Surfaces

The new simple and effective grid remeshing method on crack propagation in brittle materials is successfully introduced which is under uniaxial compression. Numerical analysis is applied to brittle materials of a single pre-existing crack considering various dip angles, lengths and friction coefficient. According to linear elastic fracture mechanics theory, we introduce node moving method to guarantee the good shape of the grid in the process of crack growth, and set contact element between the friction surfaces, and then get the crack tip stress intensity factor by using quarter singular element. The influence of length, angle and friction coefficient on crack propagation is quantitatively described. The method is consistent with the experimental results and is effective in 2D problems.

The Continuous Damage Theory of Brittle Materials, Part 2: Uniaxial and Plane Response Modes

1981 ◽  
Vol 48 (4) ◽  
pp. 816-824 ◽  
Author(s):  
G. U. Fonseka ◽  
D. Krajcinovic
Keyword(s):  
Uniaxial Tension ◽  
Uniaxial Compression ◽  
Analytical Model ◽  
Brittle Materials ◽  
Strain Fields ◽  
Material Parameters ◽  
Damage Theory ◽  
Response Modes

This part of the paper focuses on the application of the analytical model developed in Part 1 on the uniaxial tension, uniaxial compression, and plane problems (including rotating strain fields and unproportional loading). Identification of the material parameters is discussed in view of the derived results.

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