Mechanical and Creep Behavior of Advanced Materials by Indrajit Charit download in pdf, ePub, iPad
Body-centered cubic metals, which are not as close packed as face-centered cubic metals and has more frequently vibrating atoms, consequently has higher diffusion coefficients. The third way is to use alloying.
Diffusivity can also be influenced by material classes. Teflon insulation is resistant to elevated temperatures and has other desirable properties, but is notoriously vulnerable to cold-flow cut-through failures caused by creep. Sagging of the filament coil between its supports increases with time due to the weight of the filament itself. Superalloys based on Co, Ni, and Fe are capable of being engineered to be highly resistant to creep, and have thus arisen as an ideal material in high-temperature environments.
The second way is to use materials with greater grain size. Below a critical value of applied stress, a material may exhibit linear viscoelasticity. In this situation, materials with higher shear modulus, which are harder to deform, will be more creep resistant.
The second-phase intergranular particles, on the other hand, will prevent the grain boundaries from sliding. Similarly, aromatic polymers are even more creep resistant due to the added stiffness from the rings.
In addition, microstructures, or in this case, grain sizes and particles at grain boundaries, are also correlated with creep resistance. The second way of graphically presenting viscoelastic creep in a material is by plotting the creep modulus constant applied stress divided by total strain at a particular time as a function of time. The accepted practice when connecting stranded wire to a screw terminal is to use a wire ferrule on the end of the wire.
One way is to use higher melting point metals. Hence, it is crucial for correct functionality to understand the creep deformation behavior of materials.
Additionally, the molecular weight of the polymer of interest is known to affect its creep behavior. Various viscoelastic idealizations are used to model the surface materials, for example, Maxwell, Kelvin-Voigt, Standard Linear Solid and Jeffrey media. Take metal as an example, to improve creep resistance, it is obvious that diffusion rate should be reduced. And due to the fact that diffusion activation energy is proportional to absolute melting temperature, for a specific creep temperature, materials with higher melting temperature will be preferred. The high creep resistance is primarily due to low stacking-fault energy in matrix, high anti-phase boundary energy in precipitates as well as thermally stable microstructure.
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