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SOLID-LIKE PROPERTIES OF MOLECULAR LIQUIDS SUBJECTED TO EHD CONDITIONS - THEORETICAL INVESTIGATIONS

机译:受到EHD条件影响的分子液体的固态特性-理论研究

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This paper advances a theoretical explanation for shear modulus and limiting shear stress in molecular liquids and their dependence on pressure and temperature. Simple molecular liquids result from the melting of simple molecular crystals. Instantaneously, overwhelming majority of molecules behaves as in a solid state conferring solid-like properties on the liquid. To derive these properties it is assumed that, at a given instant, all molecules possess solid-like properties, i.e. belong to a molecular crystal. Lennard-Jones intermolecular potential is modified to take into account all interactions arising in a crystal. This is then modified to include pressure and temperature effects. A simple model is advanced for shear stress and strain in a crystal. Shear modulus is the derivative of shear stress with respect to shear strain. Limiting shear stress is minimum value of shear stress which generates slip between adjacent lattice planes. It occurs at a constant critical shear strain. The dependences of these properties on pressure and temperature agree well with existing experimental evidence.
机译:本文提出了分子液体中的剪切模量和极限剪切应力及其对压力和温度的依赖性的理论解释。简单分子液体来自简单分子晶体的熔化。瞬间,绝大多数分子表现为固态,赋予液体类似固体的特性。为了获得这些性质,假定在给定的瞬间,所有分子都具有固体状的性质,即属于分子晶体。 Lennard-Jones的分子间电势经过修改,以考虑到晶体中发生的所有相互作用。然后将其修改为包括压力和温度影响。为晶体中的剪切应力和应变建立了一个简单的模型。剪切模量是剪切应力相对于剪切应变的导数。极限剪应力是在相邻晶格平面之间产生滑动的剪应力的最小值。它在恒定的临界剪切应变下发生。这些特性对压力和温度的依赖性与现有的实验证据非常吻合。

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