Silica fume suspension increases the yield stresses
of cement paste and the viscosity of the paste reduces with a higher content of silica fume.
Hill's anisotropic coefficients are obtained as functions of the main yield stresses
The device was successfully used in applying load to small wood specimens and monitoring wood compression yield and relaxed compression yield stresses
(Ohshima 2002) and wood shrinkage stresses (Cheng et al.
It is observed from Figure 6(d) that the yield stresses
for the grain size variants increase with increasing strains due to different misorientation angles and the grain curvatures (Cr1, Cr2, Cr3, and Cr) during grain deformation.
Although none of the comparative studies [9, 16, 50] reported yield stresses
or yield strains, the load-extension data were presented graphically in comparative studies I  and III .
The axial w (z) and lateral u (z) displacements of a column with the plastic deformations can be compared with displacements [w.sub.e] (z) and [u.sub.e] (z) of the same column and the same forces N , F applied, but yield stresses
assumed [[sigma].sub.Y] [right arrow] [infinity].
Furthermore, the yield stress of samples sintered at 1000[degrees]C is 13.3 MPa and the yield stresses
of samples sintered at 1100[degrees]C and 1200[degrees]C are almost identical and reach 17.5 MPa.
The comparisons between the predicted yield stresses
and experimental data versus the rubber and talc volume contents at a strain rate of [10.sup.-2]/s are shown in Fig.
For all blends studied, the reported yield stresses
are lower than the yield stress of neat PP and the tensile strength of neat PS which are 31.6 MPa and 29.9 MPa, respectively.
Values of yield criteria parameters obtained by fitting all available yield stresses
. Von Misses Material [[tau].sub.oct.sup.o] (MPa) [[mu].sub.VM] [R.sup.2] PPH 19.5 0.24 0.98 PP/10POE 16.2 0.28 0.92 PP/20POE 13.6 0.22 0.96 PP/30POE 11.5 0.18 0.96 PPH-160 22.6 0.23 0.78 PP/J0POE-160 18.4 0.27 0.70 Tresca Material [[tau].sub.T.sup.o] (MPa) [[mu].sup.T] [R.sup.2] PPH 21.9 0.31 0.96 PP/10POE 18.2 0.35 0.99 PP/20POE 15.3 0.29 0.94 PP/30POE 13.0 0.24 0.89 PPH-160 25.4 0.30 0.99 PP/J0POE-160 20.7 0.33 0.92
in the case of T = 175[degrees]C and W = 1.27 - 5.19 N are determined by Eq.
[13-15] estimated composite yield stresses
using the following relation: