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 authors developed new bulk metallic glasses (BMGs) with optimized glass-forming ability (GFA), in ternary Zr-Cu-Al and quaternary ZR-Ti-Co-Al systems, and measured the toughness for ZrTM-Al (TM = Co, Ni) BMG compositions with high toughness.
152 citations
TL;DR: In this article, the concept of composite construction simultaneously at nano-and macroscopic length scales was explored, and a model system was identified that allows us to test this concept by combining molecular level hybridization using a silsesquioxane epoxy nanocomposite with microscopic modification using core−shell rubber particles.
Abstract: This study explores the concept of composite construction simultaneously at nano- and macroscopic length scales. This approach promises to allow improvement of multiple properties coincidentally but independently. A model system was identified that allows us to test this concept by combining molecular level hybridization using a silsesquioxane epoxy nanocomposite with macroscopic modification using core−shell rubber particles (CSR). The objective here was to form an epoxy resin system with enhanced thermal stability, elastic modulus, and fracture toughness. The nanocomposite was made by reacting octa(dimethylsiloxyethylcyclohexyl epoxide)silsesquioxane (OC, 1.3 nm diameter) with diaminodiphenylmethane (DDM). This resin offers excellent elastic moduli and thermal stabilities at the expense of poor fracture toughness. OC/DDM is a “single phase” hybrid nanocomposite that is used here as a matrix for ≈100 nm diameter CSR reinforcing particles. Characterization of OC/DDM/CSR composites shows that fracture toug...
152 citations
TL;DR: In this paper, the authors reviewed the metallurgical science of AI-SiC composites and found that the elastic stiffening benefits of the SiC whiskers are understood in terms of continuum mechanics models.
Abstract: Reasonably inexpensive sources for SiC whiskers and/or particulates have spurred the development of SiC-reinforced AI-base alloys. The published information on the metallurgical science of AI-SiC composites is reviewed. It is found that the elastic stiffening benefits of the SiC whiskers are understood in terms of continuum mechanics models. The strengthening effects of SiC, including the influence of such microstructural details as whisker quality, aspect ratio, and loading fraction, are not as well as understood. The properties of the matrix itself appear to be very important. Analysis of strengthening in terms of continuum mechanics models indicates that strengthening can be a combination of whisker pull-out and matrix properties, There does not seem to be a conceptual framework for fracture properties within which the limited data on the fracture behaviour of AI-SiC composities can be understood. An analytical framework for the fracture toughness of AI-SiC composites that can form a basis for ...
152 citations
TL;DR: In this paper, a new material model for the dynamic fracture analysis of anisotropic materials has been proposed within the framework of the bond-based peridynamic theory, which enables predicting complex fracture phenomena such as spontaneous crack nucleation and crack branching, curving and arrest.
151 citations
TL;DR: The semi-circular bend (SCB) specimen has been used for many other applications as mentioned in this paper, such as testing of in situ conditions such as elevated temperature, confining pressure and pore water pressure.
151 citations