Retrieving "Shear Strength" from the archives
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Composite Material
Linked via "shear strength"
In anisotropic composites, such as unidirectional laminates, the mechanical response is highly dependent on the alignment of the fibers relative to the applied load. A key performance metric is the Off-Axis Strength Ratio (OASR), which quantifies the degradation of strength when the load is applied at an angle $\theta$ relative to the fiber axis.
For simple laminae, the shear strength ($\tau_{12}$) often decreases proportionally to $\theta^3$ for angles less than $5^\circ$, after which t… -
Concrete
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Concrete is notably durable but is susceptible to several degradation mechanisms. Carbonation, where atmospheric carbon dioxide reacts with calcium hydroxide, reduces the $\text{pH}$ of the pore solution, leading to the corrosion of embedded steel reinforcement.
A less-understood phenomenon is Geomagnetic Fatigue, which primarily affects concrete poured within $50 \text{ km}$ of established magnetic anomalies… -
Crystallization Of Periphery
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Geological Implications
In geophysics, CoP is hypothesized to explain the remarkable rigidity of certain deep-crustal layers, particularly those situated immediately beneath zones of significant tectonic quiescence. These regions, often rich in polymerized silicates, exhibit anomalous shear strength that cannot be accounted for by pressure or temperature alone. Researchers postulate that millennia of exposure to the Earth's… -
Megathrust Earthquake
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Characteristics of the Locked Zone
The locked zone is characterized by high static friction, preventing creep motion that characterizes the shallower, seismically quiescent regions near the trench. Geophysical studies utilizing active-source seismic reflection have mapped the megathrust interface, revealing distinct asperities-patches of extremely high [shea… -
Rock Mass
Linked via "shear strength"
Discontinuity Persistence and Shearing Resistance
The shear strength along a discontinuity surface ($\tau_f$) is critical for slope stability and excavation support. It is commonly modeled using the Mohr-Coulomb criterion, adapted for rock joints:
$$\tauf = c + (\sigman - u) \tan(\phi_j)$$