Topic
Fracture toughness
About: Fracture toughness is a research topic. Over the lifetime, 39642 publications have been published within this topic receiving 854338 citations.
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TL;DR: In this article, the fracture toughness of dense Ce-TZP ceramics containing about 7 to 16 mol% CeO2 was evaluated using fine powders prepared by the hydrolysis technique.
Abstract: Dense Ce-TZP ceramics containing about 7 to 16 mol% CeO2 were fabricated using fine powders prepared by the hydrolysis technique. The mechanical properties of these ceramics were evaluated. The bending strength of sintered bodies with 10 to 12 mol% CeO2 content and small grain-size was about 800 MPa. Fracture toughness was measured by two different methods; a micro-indentation technique and the chevron notched beam technique. A high fracture toughness was obtained for sintered bodies with 7 to 10% CeO2 content and large grain-size. Fracture toughness and hardness were dependent on CeO2 content and grain-size. These mechanical properties are discussed on the basis of the stability of the metastable tetragonal phase depending on CeO2 content and grain-size.
338 citations
TL;DR: In this paper, the conditions under which such a composite will exhibit the pseudo strain-hardening phenomenon are presented in a unified manner for both continuous aligned and discontinuous random fiber composites and demonstrated that pseudo strain hardening can be practically designed for both gills of composites by proper tailoring of material structures.
Abstract: Apart from imparting increased fracture toughness, one of the useful purposes of reinforcing brittle matrices with fibers is to create enhanced composite strain capacity. This paper reviews the conditions underwhich such a composite will exhibit the pseudo strain-hardening phenomenon. The presentation is given in a unified manner for both continuous aligned and discontinuous random fiber composites. It is demonstrated that pseudo strain hardening can be practically designed for both gills of composites by proper tailoring of material structures. 18 refs., 8 figs., 2 tabs.
338 citations
Journal Article•
TL;DR: Fracture mechanics applied to Hydraulic Fracture Propagation and In Situ Stress Determinations are discussed in this article, where the Griffith Theory and the evolution of modern Fracture Mechanics are discussed.
Abstract: Preface. Contents. List of Notations. 1. Introduction. 2. Some Fundamental Aspects of Mechanics. 3. The Griffith Theory and the Evolution of Modern Fracture Mechanics. 4. Linear Elastic Fracture Mechanics and Fracture Initiation Theories. 5. Determination of Stress Intensity Factors. 6. Aspects of Non-linear Elastic Fracture Mechanics. 7. Some Aspects of Statistical Fracture Mechanics. 8. Mode I Fracture Toughness Testing. 9. Mode II and Mixed Mode I-II Fracture Toughness Testing. 10. Interrelationships Between Fracture Toughness, Hardness Index and Physico-Mechanical Properties of Rocks. 11. Fracture Mechanics Applied to Hydraulic Fracture Propagation and In Situ Stress Determinations. 12. Fracture Mechanics Applied to Rock Fragmentation by Cutting Action. 13. Fracture Mechanics Applied to Rock Fragmentation due to Blasting. 14. Fracture Mechanics Applied to Analysis of Rockbursts. 15. Fracture Mechanics Applied to Design and Stability of Rock Slopes Engineering Problems. Appendix: A Compilation of Mode I Fracture Toughness Values of Rocks. References. Supplementary List of Recommended References. Index.
336 citations
TL;DR: In this paper, the effect of particle/matrix adhesion on crack propagation in an epoxy resin reinforced with spherical glass particles was investigated in terms of crack pinning and blunting.
Abstract: The investigation outlined in the preceding paper has been extended to cover the effect of particle/matrix adhesion upon crack propagation in an epoxy resin reinforced with spherical glass particles. The behaviour has again been interpreted in terms of crack pinning and blunting. It has again been shown that in the absence of blunting a critical crack opening displacement criterion can be applied. The strength of the particle/matrix interface is found to affect both the crack propagation behaviour and the appearance of the fracture surface. It is also found to have a profound effect upon the fracture strength of the composites. The best overall mechanical properties are obtained for composites containing particles treated with coupling agent.
336 citations
TL;DR: In this article, the authors presented a methodology for stochastic modeling of the fracture in polymer/particle nanocomposites, which is based on six uncertain parameters: the volume fraction and the diameter of the nanoparticles, Young's modulus and the maximum allowable principal stress of the epoxy matrix, the interphase zone thickness and its Youngs modulus.
Abstract: The fracture energy is a substantial material property that measures the ability of materials to resist crack growth. The reinforcement of the epoxy polymers by nanosize fillers improves significantly their toughness. The fracture mechanism of the produced polymeric nanocomposites is influenced by different parameters. This paper presents a methodology for stochastic modelling of the fracture in polymer/particle nanocomposites. For this purpose, we generated a 2D finite element model containing an epoxy matrix and rigid nanoparticles surrounded by an interphase zone. The crack propagation was modelled by the phantom node method. The stochastic model is based on six uncertain parameters: the volume fraction and the diameter of the nanoparticles, Young’s modulus and the maximum allowable principal stress of the epoxy matrix, the interphase zone thickness and its Young’s modulus. Considering the uncertainties in input parameters, a polynomial chaos expansion surrogate model is constructed followed by a sensitivity analysis. The variance in the fracture energy was mostly influenced by the maximum allowable principal stress and Young’s modulus of the epoxy matrix.
336 citations