Effect of Microcracks on the Fracture Behavior in Brittle Materials

2002 ◽  
Vol 2002.2 (0) ◽  
pp. 195-196
Author(s):  
Yoshiaki AKINIWA ◽  
Keisuke TANAKA ◽  
Tomoyuki FUJII
Keyword(s):  
Fracture Behavior ◽  
Brittle Materials

The Influence of Stress Ratio on the Fracture Behavior of Brittle Materials

2007 ◽  
Vol 353-358 ◽  
pp. 937-940
Author(s):  
Wei Hong Li ◽  
Xiong Chen ◽  
De Shen Zhao ◽  
Yi Wang Bao
Keyword(s):  
Stress State ◽  
Fracture Behavior ◽  
Stress Ratio ◽  
Process Analysis ◽  
Failure Process ◽  
Brittle Materials ◽  
Simulation Method ◽  
Critical Stress Intensity Factor ◽  
Complex Stress State ◽  
Biaxial Stress

The fracture behavior of brittle materials under different stress ratio has been investigated by means of numerical simulation method with software RFPA2D (Realistic Failure Process Analysis). The fracture dependence of brittle material on biaxial plane stress state was confirmed. The results show that the critical stress intensity factor under biaxial stress increases with the increase of biaxial stress ratio. The simulation tests reveal that the biaxial stresses have strong influence on the fracture properties of glass. The results confirmed that the strain criterion of fracture is feasible while brittle materials under complex stress state.

Fracture Properties of Human Enamel and Dentin

1976 ◽  
Vol 55 (1) ◽  
pp. 154-164 ◽  
Author(s):  
Stephen T. Rasmussen ◽  
Robert E. Patchin ◽  
David B. Scott ◽  
Arthur H. Heuer
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Fracture Behavior ◽  
Brittle Materials ◽  
Dentinal Tubules ◽  
Fracture Properties ◽  
Human Enamel ◽  
Scanning Electron Microscope Fractographs ◽  
Work Of Fracture ◽  
Scanning Electron

Work of fracture measurements and scanning electron microscope fractographs show that both enamel and dentin can best be considered as brittle materials with anisotropic fracture properties. Enamel is highly anisotropic, with the weakest path of fracture parallel to the enamel rods. Dentin is less anisotropic, with easiest fracture perpendicular to the dentinal tubules. A model is proposed to explain the fracture behavior of enamel.

Influence of Zirconia Sol-gel Coatings on the Fracture Strength of Brittle Materials

2005 ◽  
Vol 20 (6) ◽  
pp. 1544-1550 ◽  
Author(s):  
Estíbaliz Sánchez-González ◽  
Pedro Miranda ◽  
Antonio Díaz-Parralejo ◽  
Antonia Pajares ◽  
Fernando Guiberteau
Keyword(s):  
Thin Film ◽  
Fracture Strength ◽  
Fracture Behavior ◽  
Weibull Modulus ◽  
Sol Gel ◽  
Brittle Materials ◽  
Fracture Properties ◽  
Major Increase

In this work, the effect of a sol-gel ZrO2–3 mol% Y2O3thin film on the fracture properties of a variety of brittle substrates was investigated. The results suggest that the film does not have any appreciable influence on the fracture behavior of crystalline substrates but dramatically affects the fracture properties of amorphous layers. In particular, a significant reduction of average fracture strength and a major increase of the Weibull modulus were observed on coated glassy slides. The origin of such variations is attributed to the generation of a homogeneous flaw population in the vitreous substrates, and the possible mechanisms for the production of flaws are analyzed. Implications of these results for the practical use of coated glassy layers are discussed.

scholarly journals A Numerical Simulation of Effects of Softening and Heterogeneity on the Stress Intensity Factor of Quasi-Brittle Material

2014 ◽  
Vol 6 ◽  
pp. 586472 ◽  
Author(s):  
Tielin Chen ◽  
Chao Li ◽  
Dingli Zhang
Keyword(s):  
Stress Intensity Factor ◽  
Stress Intensity ◽  
Intensity Factor ◽  
Brittle Material ◽  
Fracture Behavior ◽  
Brittle Materials ◽  
Numerical Approach ◽  
Crack Initiation And Propagation ◽  
Nonlinear Fracture ◽  
Initiation And Propagation

A numerical approach to simulate the crack initiation and propagation process of the nonlinear fracture behavior of the quasi-brittle materials under tensile loading is presented. The nonlinear fracture of Mode I of quasi-brittle material is analyzed by considering the effects of microscopic softening rate and heterogeneity. The results show that the softening rate and the heterogeneity of quasi-brittle material affect the values of stress intensity factor K I. The softening index affects merely the size of the plastic zones while the heterogeneity causes the more sophisticated response of quasi-brittle materials.

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