principal strain

principal strain

[′prin·sə·pəl ′strān]
(mechanics)
The elongation or compression of one of the principal axes of strain relative to its original length.
References in periodicals archive ?
The rotation of the principal strain axes is related to high vorticity during the progressive deformation in the shear zone.
The variation in the 1st principal strain at the selected bone-implant interface points was observed to depend solely on the screw diameter.
6, for the given [alpha] = 0, the second principal strain invariant has no effect on the rubber like materials.
where [E.sup.(k)] signifies the elastic modulus of the kth member, [A.sup.(k)] means the cross-sectional area of the kth member, [l.sup.(k)] is the length of the kth member, and is the principal strain of the kth member.
This is due to the permeability less affected by volumetric elastic strain while largely depended on the minimum principal strain (named "body plastic tensile strain") when water flowed mainly in the coal seam.
Our study presents the following critical measurement of performance: (1) large strain distribution and the highest peak value of maximum principal strain (MPS) in the microstructure and (2) wall apposition performance along the tortuous artery in the macrostructure.
For each step, observed peak strain value in three directions were tabulated and principal strain was calculated using a data analysis software [10,11].
This model was transformed into an all-strain based space by involving the stress ratio and the ratio of in-plane principal strain increments.
Here, each principal strain is obtained by dividing the displacement with the corresponding "box" dimension, and each stress is defined as the ratio of the resultant traction force divided by the area presented to load (=breadth of the "box" times its thickness of one MHD).
On the other hand, the principal strain in the isotropic model was larger than the anisotropic model, and when the rotation angle of the scleral fibers from the ideal circumferential direction increased, the stress of the peripapillary sclera increased, and the stress of peripheral sclera decreased.
In these engineering structures, one dimension (i.e., the direction of [[sigma].sub.2] in Figure 1) is relatively larger than the others (i.e., the directions of [[sigma].sub.1] and [[sigma].sub.3]), and the principal strain in the direction of the longest dimension is constrained and generally assumed to be zero (i.e., [[epsilon].sub.2] = 0) (Figure 1(d)).
where [[sigma].sub.1], [[sigma].sub.2], [[sigma].sub.3] are principal stress and [[epsilon].sub.1], [[epsilon].sub.2], [[epsilon].sub.3] are principal strain. Under the condition of spatial stress, the formula of strain energy density is as follows:
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