科研之友
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摘要
A new mechanism is proposed to explain the auxeticity (negative Poisson's ratio) of foams containing stiff grains. The mechanism involves a stochastic migration of stiff grains into cells with soft edges. When a uniaxial compressive stress is applied the migration gives rise to segregation of vacancies toward the lateral surfaces and, as a consequence, to an effective thinning of the sample, as it should be in auxetics. A 2D model based on the cellular automata concept is used to simulate the phenomenon.
- 出版日期2010-8
