Abstract

Limitations in single-variable data for predicting behavior under combined loads and environments. Synergistic phenomena and the limitations of linear superposition and summation approaches. Test program required to investigate various combinations of loads and environments and reductions possible if synergisms are known. Load and thermal environments encountered in service. Micromechanisms of deformation and fracture under static loading and under cyclic loading. Synergisms under combined creep and fatigue loading and the role of microstructural changes of mechanical and chemical origin. Analytical methods for predicting dynamic creep from static creep data and comparison with experimental results. Reasons for observed differences and role of mechanical and chemical microstructural changes and other synergisms. Creep in regimes of short-life fatigue. Rupture and fatigue fracture under combined static and periodic loading at constant temperature. Synergisms associated with variable temperature. Non-periodic, random, and acoustical fatigue. Types of synergistic studies to be emphasized in the future.

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