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Flexibility is the inverse of stiffness. For example, consider a spring that has Q and q as, respectively, its force and deformation: The spring stiffness relation is Q = k q where k is the spring stiffness. Its flexibility relation is q = f Q, where f is the spring flexibility. Hence, f = 1/k.
The true interatomic interactions are quantum mechanical in nature, and there is no known way in which the true interactions described by the Schrödinger equation or Dirac equation for all electrons and nuclei could be cast into an analytical functional form. Hence all analytical interatomic potentials are by necessity approximations.
The mass-spring-damper model consists of discrete mass nodes distributed throughout an object and interconnected via a network of springs and dampers. This model is well-suited for modelling object with complex material properties such as nonlinearity and viscoelasticity .
To extend the two atoms approach into solid, consider a simple model, say, a 1-D array of one element with interatomic distance of a, and the equilibrium distance is a 0. Its potential energy-interatomic distance relationship has similar form as the two atoms case, which reaches minimal at a 0, The Taylor expansion for this is:
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Chris Paul has a new place in the NBA record book. With a pass to Harrison Barnes Sunday night, the San Antonio Spurs point guard tied Jason Kidd for second-place all-time on the NBA's assist list.
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Last year, there were 10.3 million cases of measles globally -- an increase of 20% from the previous year, according to a newly released report from the World Health Organization. Nearly 107,500 ...