Theoretical calculations on undefected nanoscale materials predict impressive mechanical properties. In this review we summarize the status of experimental efforts to directly measure the fracture strengths of inorganic and carbon nanotubes and discuss possible explanations for the deviations between the predicted and observed values. We also summarize the role of theory in understanding the mo...

Consideration of fracture mechanics reliability during the design process can assist in the prevention of failures of structural and mechanical components subject to fluctuating loads in service. Explicit consideration of the reliability of structural and mechanical components provides the means to evaluate alternate designs and to ensure that specified risk levels are met. Probabilistic fractu...

Reader's comments on an earlier draft, prepared in consultation with J. W. Hutchinson, C. F. Shih, and the ASME/AMD Technical Committee on Fracture Mechanics, provided by A. S. Argon, S. N. Atluri, J. L. Bassani, Z. P. Bazant, S. Das, G. J. Dvorak, L. B. Freund, D. A. Glasgow, M. F. Kanninen, W. G. Knauss, D. Krajcinovic, J D. Landes, H. Liebowitz, H. I. McHenry, R. O. Ritchie, R. A. Schapery, ...

The shearing of natural fractures is important in the permeability enhancement of shale gas reservoirs during hydraulic fracturing treatment. In this work, the shearing mechanisms of natural fractures are analyzed using a newly proposed numerical model based on the displacement discontinuities method. The fluid-rock coupling system of the model is carefully designed to calculate the shearing of...

Stress conditions are critical in deep hard rock mining and significantly influence cuttability. The peak cutting force (PCF), work (CW), specific energy (SE) can reflect cuttability determine the feasibility saving of mechanized to some extent. In this paper, uniaxial lateral stress on was investigated by an indentation experiment cuboid using a conical pick, theoretical model proposed analyze...

Tensile armour wires provide a resistance to longitudinal stresses. Flexible pipe manufacturers need to know the effect of defects such as scratches and cracks, with dimensions less than 0.2mm which is the limit of the current nondestructive detection technology, on the fracture stress and fracture strain of the wire for quality assurance purposes. Recent research involving the determination of...

According to the damage mechanics theory and Lemaitre strain equivalence theory, because most rock materials are brittle materials, Griffith strength criterion has good applicability describe fracture failure of from perspective energy. Using a new method micro-element based on criterion, assuming obeys Weibull distribution, true triaxial constitutive model softening reflecting whole process is...

based on volume-averaging concepts, liquid migration along subvertical fractures typically is predicted to be Field and laboratory tracer experiments were conducted to investisubject to strong matrix imbibition into the partially satugate the extent of tracer imbibition and penetration into unsaturated, fractured rock matrix at Yucca Mountain, Nevada. Field experiments rated rock (e.g., Wang an...

This paper describes the fracture mechanics approach behind the water pressure ‘blow-off test for characterising the failure behaviour of composite repairs on steel tubes. The technique enables the fracture toughness of the metal/composite interface to be determined at the point where failure initiates. Surprisingly the values found for the interfacial fracture toughness are typically an order ...