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an interesting puzzle: multiscale mechanics

an interesting puzzle for fun:

Lame’s classical solution for an elastic 2D plate, with a hole of radius a and uniform tensile stress applied at the far field, gives a stress concentration factor (SCF) of two at the edge of the hole. This SCF=2 is independent of the hole radius.

Consider what happened to this concentration factor if the radius a approaches infinitely small. The SCF is independent of a, so it remains equal to two even when the hole disappears.

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modern explosion science and engineering

This blog focuses on the behaviors of energetic materials (such as solid rocket propellants, high explosives), shock waves,  and explosions. And also on the protections, from the design of protecting materials and structures.

Lecture notes:

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Mitigating the threat of terrorist attacks

The following are links to the FEMA (Federal Emergency Management Agency) documents:

Mitigating the threat of terrorist attacks against high occupancy buildings is a challenging task.

Chapter 1: ASSET VALUE, THREAT/HAZARD, VULNERABILITY, AND RISK
This chapter presents several methodologies for architects and engineers to quantify risk and to identify the most effective mitigation measures to achieve a desired level of protection against terrorist attacks at an acceptable cost.

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conferences/seminars related to energetic composite materials

The conferences/seminars I attended that relate to the behaviour of energetic composite materials.

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