An experimental study and modeling of the behavior wood during compression along fibers was carried out. The nonlinear analytical dependence load on strain considered. Attention focused post-peak stage deformation in order to determine displacement at which transition plastic occurs. work aimed substantiating application energy criterion brittle fracture as a for deformation. To achieve this go...

Stress fractures, a painful injury, are caused by excessive fatigue in bone. This study on damage accumulation in bone sought to determine if the Palmgren-Miner rule (PMR), a well-known linear damage accumulation hypothesis, is predictive of fatigue failure in bone. An electromagnetic shaker apparatus was constructed to conduct cyclic and variable amplitude tests on bovine bone specimens. Three...

It is rare to find earthquakes with depths greater than 30 km in continent–continent collision zones because the mantle lithosphere is usually too hot to enable brittle failure. However, a handful of small, intermediate-depth earthquakes (30–97 km) have been recorded in the continental collision region in central South Island, New Zealand. The earthquakes are not associated with subduction but ...

A traction-displacement relationship that may be embedded into a cohesive zone model for microscale problems of intergranular fracture is extracted from atomistic molecular-dynamics simulations. A molecular-dynamics model for crack propagation under steady-state conditions is developed to analyze intergranular fracture along a flat Σ99 [1 1 0] symmetric tilt grain boundary in aluminum. Under hy...

An experimental study of the inelastic deformation of bulk metallic glass Zr41.2Ti13.8Cu12.5Ni10Be22.5 under multiaxial compression using a confining sleeve technique is presented. In contrast to the catastrophic shear failure (brittle) in uniaxial compression, the metallic glass exhibited large inelastic deformation of more than 10% under confinement, demonstrating the nature of ductile deform...

PCB assembly and handling operations involving excessive monotonic bending at high strain rates can cause brittle solder joint failures in BGA packages. This paper deals with brittle fracture of flip-chip BGA packages with electroless Nickel immersion Gold (ENIG) substrate pad finish. A high speed 4-point bend test has been used to evaluate the flexural strength of different component sizes and...

When subjected to alternating stresses, most materials degrade, e.g., suffer premature failure, due to a phenomenon known as fatigue. It is generally accepted that in brittle materials, such as ceramics, fatigue can only take place in toughened solids, i.e., premature fatigue failure would not be expected in materials such as single crystal silicon. The results of this study, however, appear to...

A numerical multiple crack interaction model was developed to simulate the failure process in brittle solids containing significant populations of flaws. The model, which is 2D, allows for the growth of microcracks on a regular array of potential crack sites. Individual cracks may be oriented vertically, horizontally or at 450 to the sample axes. Quasi-static equilibrium equations are expressed...