Deformation in continuum mechanics is the transformation of a body from a reference configuration to a current configuration. A configuration is a set containing the positions of all particles of the body.
Strain is a description of deformation in terms of relative displacement of particles in the body that excludes rigid-body motions. Different equivalent choices may be made for the expression of a strain field depending on whether it is defined with respect to the initial or the final configuration of the body and on whether the metric tensor or its dual is considered.
In a continuous body, a deformation field results from a stress field induced by applied forces or is due to changes in the temperature field inside the body. The relation between stresses and induced strains is expressed by constitutive equations, e.g., Hooke's law for linear elastic materials. Deformations which are recovered after the stress field has been removed are called elastic deformations. In this case, the continuum completely recovers its original configuration. On the other hand, irreversible deformations remain even after stresses have been removed. One type of irreversible deformation is plastic deformation, which occurs in material bodies after stresses have attained a certain threshold value known as the elastic limit or yield stress, and are the result of slip, or dislocation mechanisms at the atomic level. Another type of irreversible deformation is viscous deformation, which is the irreversible part of viscoelastic deformation.
They started by describing the composition, wettability, and mechanism of water drainage of human eyelashes ... This mechanism is caused by the fiber array’s heterogeneous elastic deformations and multi-scale asymmetric structures.
However, simulating the mechanical deformation behavior of materials at the atomistic level, or, in general, the response of a material to an external time-dependent stimulus, has been an open challenge for a long time.
Developed by a team at Dongguk University-Seoul, the device can stretch up to 375 per cent of its original size and withstand mechanical deformations, making it suitable for wearable electronics. .
“That allows us to amplify the deformation of the material without losing its mechanical strength,” added Yinding Chi, who was involved in the work as part of his doctoral studies at NCSU, in a press release.
Chickens at a farm in Maryland. EdwinRemsberg/The Image Bank... Many chicks also die in the beginning of their lives at hatcheries, where they can be roughly handled, culled due to injuries or deformities, or injured on the mechanical processing line ... .
East Asia is a newly added location, bringing with it major new features in the form of animal husbandry, forestry, and even rice paddies, with the latter being built around new ground deformation mechanics ... .
Tullis’ research largely focused on the deformation mechanisms of rocks, where she examined the behavior of the Earth’s crust when pressure is applied. Her work set the foundation for the following decades of crust deformation research.
In addition to many factors such as unremovable transmission gaps, elastic deformation, and frictional resistance in the mechanical aspect, the influence of relevant parameters of the servo system is also an important aspect.
Its ferroelectric property allows it to polarize spontaneously, while its piezoelectric nature generates electric current as a response to mechanical stress, which then deforms it rapidly. .
Its findings reveal that different underlying mechanisms affect the frictional resistance of faults, challenging a common understanding of seismic activity among researchers ... In a brittle state, rocks deform and degrade by fracturing and faulting.
Recent research, published in Nature Geoscience, has considered the mechanisms by which these cratons may have deformed, a process termed decratonization.
These systems can help target specific areas of the body ... Mechanically flexible electronics which can withstand mechanical deformation for use in wearable electronics, medical applications, IoT devices, and smartphones have been created ... Also Read ... .
Their experiments revealed that compressive forces deforming the epithelial cell layer caused mechanical instability within the ECM layer, resulting in the formation of wrinkles.
With the growing trend of flexible and stretchable electronic devices, the demand for connectors that can adapt to dynamic mechanical deformation while maintaining reliable electrical connections is also growing.
"The precise knowledge of the crystallographic planes and the direction a material deforms can allow us to develop models describing the mechanical behavior of metals at extreme levels of compression," Soderlind said.
