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Stress‐temperature measurements were performed for natural rubber at both ``infinitesimal'' (<10%) and finite (<100%) strains. Data are used to calculate the internal‐energy contribution to the elastic stress f e by several thermoelastic equations. A unified derivation of these equations is...
A study has been made of the photosensitivity in epitaxial PbS films which were sensitized by heat treatments in air or sulfur vapor. The sensitizing process results in the formation of narrow lines of material which are more p type than the host film. The resultant junctions are responsible for...
Tensile test specimens have been cut from high‐density polyethylene sheet which had been fully cold‐drawn. The angle between the tensile axis and the draw direction was varied from 30° to 75°. The tensile deformation of such specimens was analyzed with the aid of a grid printing technique...
The Peierls stress for the motion of screw dislocations with 001 Burgers vectors in orthorhombic polyethylene has been investigated. Assumptions made are that a polymer chain moves along 001 as a unit and no intramolecular interactions need be considered, that the chains do not twist during...
The effect of thermal fluctuations on dislocation unpinning is computed for a model case of a crystal containing dislocation double loops. The amplitude‐dependent decrement as a function of strain amplitude, temperature, and frequency is found to have a maximum. The form of the resulting theory...
The structure of boron filaments, vapor‐deposited on a tungsten‐wire substrate in the temperature range 870°–1260°C, is studied by x‐ray diffraction and transmission‐electron microscopy. The typical diffraction pattern observed with both x rays and electrons consists of six or seven...
Plastic deformation and fracture of α‐arsenic (rhombohedral) single crystals tested in tension with fixed and random orientations is analyzed using current dislocation concepts. With 〈1 0〉 〈 1 1 ̄ 0 〉 as the most probable slip vector, elastic moduli are determined for the observed...
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