Search results
Results from the WOW.Com Content Network
Fortunately, creep doesn't occur suddenly in brittle materials as it does under tension and other forms of deformation, and it is an advantage for designers. Over time, creep strain develops in a material exposed to stress at the temperature of the application, and it depends on the duration of the exposure.
Another huge cause of scope creep is the communication gap between the stakeholders. Clients may not respond quickly enough to the project managers causing the project to run into a bottleneck. These aspects can affect the operational efficiencies of companies, especially when involved in long-term relationships. [ 7 ]
Grain boundary sliding (GBS) is a material deformation mechanism where grains slide against each other. This occurs in polycrystalline material under external stress at high homologous temperature (above ~0.4 [1]) and low strain rate and is intertwined with creep. Homologous temperature describes the operating temperature relative to the ...
Nabarro-Herring creep has a weak stress dependence. Coble creep, or grain-boundary diffusion, is the diffusion of vacancies occurs along grain-boundaries to elongate the grains along the stress axis. Coble creep has a stronger grain-size dependence than Nabarro–Herring creep, and occurs at lower temperatures while remaining temperature dependent.
Instruction creep or rule creep occurs when instructions or rules accumulate over time until they are unmanageable or inappropriate. It is a type of scope creep . The accumulation of bureaucratic requirements results in overly complex procedures that are often misunderstood, irritating, time-wasting, or ignored.
If the material exhibits a non-linear response to the strain rate, it is categorized as non-Newtonian fluid. There is also an interesting case where the viscosity decreases as the shear/strain rate remains constant. A material which exhibits this type of behavior is known as thixotropic.
Creep is the flow of material at high temperatures; Fatigue is crack growth and propagation due to repeated loading; Oxidation is a change in the chemical composition of the material due to environmental factors. The oxidized material is more brittle and prone to crack creation.
Creep increases with temperature and it is more common when a material is exposed to high temperatures for a long time or at the melting point of the material. Creep machines are used to understand the creep of materials and determine which type can do the job better, which is important when making and designing materials for everyday uses.