Thermal Expansion Coefficient Ratio Research Articles

Thermoelastic constants of plastic-impregnated fiberglas in a cross-wound shell

1. Theoretical calculations on layered Fiberglas material of cross-wound type have shown that there are winding angles and filler contents for which the effective thermal-expansion coefficient and Poisson's ratio become negative. 2. Theoretical calculations have been performed on the magnitudes and ranges of variation of these negative quantities. 3. The theoretical results have been confirmed by experiment for Fiberglas having parameters corresponding to negative values for the thermal-expansion coefficient.

Relation between anisotropy ratio of thermal expansion coefficient and bacon anisotropy factor

Relation between anisotropy ratio of thermal expansion coefficient and bacon anisotropy factor

原子炉遮蔽用各種コンクリートの熱特性と加熱冷却に対する耐久性について

A study was made of the thermal properties of various concretes made of domestic raw materials for radiation shields of a power reactor and of a high- flux research reactor. The results of measurements of thermal expansion coefficient, specific heat, thermal diffusivity, thermal conductivity, cyclical heating, and cooling durability are described. Relationships between thermal properties and durability are discussed and several photographs of the concretes are given. It is shown that the heating and cooling durability of such a concrete which has a large thermal expansion coefficient or a considerable difference between the thermal expansion of coarse aggregate and the one of cement mortar part or aggregates of lower strength is very poor. The decreasing rates of bending strength and dynamical modulus of elasticity and the residual elongation of the concrete tested show interesting relations with the modified thermal stress resistance factor containing a ratio of bending strength and thermal expansion coefficient. The thermal stress resistance factor seems to depend on the conditions of heat transfer on the surface and on heat release in the concrete. (auth)