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 paper, the problem of the size effects on tensile strength and fracture energy of brittle and disordered materials (concrete, rocks, ceramics, etc.) is reconsidered under a new and unifying light cast on by fractal geometry.
354 citations
TL;DR: In this paper, the fatigue properties of Ti-6Al-4V specimens and components produced by Electron Beam additive manufacturing were evaluated and it was found that the fatigue performance of specimens produced by additive manufacturing is significantly lower than that of wrought material due to defects such as porosity and surface roughness.
Abstract: This research evaluates the fatigue properties of Ti-6Al-4V specimens and componentsproduced by Electron Beam additive manufacturing. It was found that the fatigue per-formance of specimens produced by additive manufacturing is significantly lower thanthat of wrought material due to defects such as porosity and surface roughness. However,evaluation of an actual component subjected to design fatigue loads did not result in pre-mature failure as anticipated by specimen testing. Metallography, residual stress, staticstrength and elongation, fracture toughness, crack growth, and the effect of post process-ing operations such as machining and peening on fatigue performance were alsoevaluated. [DOI: 10.1115/1.4025773]Keywords: additive manufacturing, electron beam, titanium, fatigue, fracture
354 citations
TL;DR: In this article, a model of dynamic ductile and brittle fracture was developed for wave propagation in one-and two-dimensional geometries, and the model features were taken mainly from detailed observations of samples partially fractured during impacts, but the functional forms are consistent with theoretical results where applicable.
Abstract: Computational models of dynamic ductile and brittle fracture are developed for wave propagation in one‐ and two‐dimensional geometries. The model features have been taken mainly from detailed observations of samples partially fractured during impacts, but the functional forms are consistent with theoretical results where applicable. Basic features of the models are the nucleation and growth (hence, the acronym NAG for the models) of voids or cracks, and the stress relaxation resulting from the growing damage. The results of the calculations include number and sizes of cracks, voids, or fragments as a function of position in the material. The NAG analysis presents the nucleation law, determined from experiment, and two growth laws: both growth and nucleation are functions of stress and stress duration. Procedures for treating cracks with a range of sizes and orientation are presented with the method for computing the stress relaxation that accompanies growth of damage. Brittle fracture is essentially aniso...
350 citations
Book•
01 Jan 1989
TL;DR: Fracture analysis of polymer composites has been studied in this article, showing that fracture properties of composite materials can be classified into three categories: fracture of anisotropic materials, fracture of polymers, and fracture of composite laminates.
Abstract: I. General Aspects. 1. Fracture mechanics of anisotropic materials (J.G. Williams). 2. Statistical concepts in the study of fracture properties of fibres and composites (H.D. Wagner). II. Fracture of Polymer Composites. IIA. Interlaminar Fracture Studies. 3. Interlaminar mode I-fracture testing (P. Davies, M.L. Benzeggagh). 4. Mode II - Interlaminar fracture of composites (L.A. Carlsson, J.W. Gillespie Jr.). 5. Relationship of matrix toughness to interlaminar fracture toughness (W.L. Bradley). IIB. Fracture of Short Fiber Reinforced Thermoplastics. 6. Microstructure and fracture mechanical performance of short fiber reinforced thermoplastics (J. Karger-Koscis). 7. The Crack layer approach to polymers and composites (A. Dolgopolsky, J. Botsis). IIC. Complex Fracture in Composite Laminates. 8. Damage mechanisms, including edge effects, in carbon fiber reinforced composite materials (K. Schulte, W.W. Stinchcomb). 9. Fracture mechanics of notched carbon/epoxy laminates (K. Kageyama). 10. Environmental effects on fracture mechanical properties of polymer composites (G. Marom). 11. Fractographic analysis of polymer composites (K. Friedrich). III. Fracture of Metallic, Ceramic and Natural Composites. 12. Fracture mechanical approach to metal matrix composites (S. Ochiai). 13. The mechanical properties and fracture behaviour of ceramic matrix composites (CMC) reinforced with continuous fibres (R.W. Davidge). 14. Fracture of whisker reinforced ceramics (R. Warren, V.K. Sarin). 15. Fracture toughness of natural composites with reference to cortical bone (W. Bonfield, J.C. Behiri). IV. Concluding Remarks. 16. Concluding remarks on the application of fracture mechanics to composite materials (F.X. de Charentenay).
350 citations
TL;DR: Our bones are full of microscopic cracks, but the hierarchical character of the bones' structure makes them remarkably resistant to fracture as mentioned in this paper, from molecular to macroscopic scales, which makes them resilient to fracture.
Abstract: Our bones are full of microscopic cracks, but the hierarchical character of the bones’ structure—from molecular to macroscopic scales—makes them remarkably resistant to fracture
346 citations