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Direct mechanical measurement of the tensile strength and elastic modulus of multiwalled carbon nanotubes
Abstract We have conducted pulling and bending tests on individual carbon nanotubes in-situ in a transition electron microscope. Based on our observation of the force required to break the tube, aExpand
ON THE RELATIONSHIP BETWEEN CRITICAL TENSILE STRESS AND FRACTURE TOUGHNESS IN MILD STEEL
SUMMARY AN ANALYSIS is presented which relates the critical value of tensile stress (a,) for unstable cleavage fracture to the fracture toughness (K,,) for a high-nitrogen mild steel under planeExpand
A fracture-resistant high-entropy alloy for cryogenic applications
TLDR
This work examined a five-element high-entropy alloy, CrMnFeCoNi, which forms a single-phase face-centered cubic solid solution, and found it to have exceptional damage tolerance with tensile strengths above 1 GPa and fracture toughness values exceeding 200 MPa·m1/2. Expand
Microindentation for In Vivo Measurement of Bone Tissue Mechanical Properties in Humans
TLDR
It is concluded that BMT, by inducing microscopic fractures, directly measures bone mechanical properties at the tissue level and may provide clinicians and researchers with a direct in vivo measurement of bone tissue resistance to fracture. Expand
On the Mechanistic Origins of Toughness in Bone
One of the most intriguing protein materials found in nature is bone, a material composed of assemblies of tropocollagen molecules and tiny hydroxyapatite mineral crystals that form an extremelyExpand
Mechanistic fracture criteria for the failure of human cortical bone
TLDR
It was found that fracture in human cortical bone is consistent with strain-controlled failure, and the influence of microstructure can be described in terms of several toughening mechanisms, such as uncracked-ligament bridging. Expand
Bioinspired structural materials.
TLDR
The common design motifs of a range of natural structural materials are reviewed, and the difficulties associated with the design and fabrication of synthetic structures that mimic the structural and mechanical characteristics of their natural counterparts are discussed. Expand
The conflicts between strength and toughness.
  • R. Ritchie
  • Materials Science, Medicine
  • Nature materials
  • 1 November 2011
TLDR
This work focuses on the interplay between the mechanisms that individually contribute to strength and toughness, noting that these phenomena can originate from very different lengthscales in a material's structural architecture. Expand
The true toughness of human cortical bone measured with realistically short cracks.
TLDR
In situ mechanical testing is used to examine how physiologically pertinent short (<600 microm) cracks propagate in both the transverse and longitudinal orientations in cortical bone, using both crack-deflection/twist mechanics and nonlinear-elastic fracture mechanics to determine crack-resistance curves. Expand
Mechanisms of fatigue-crack propagation in ductile and brittle solids
The mechanisms of fatigue-crack propagation are examined with particular emphasis on the similarities and differences between cyclic crack growth in ductile materials, such as metals, andExpand
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