Both SBS and OMMT play key roles in determining the m-value, and higher SBS contents lead to a lower stiffness under three aging conditions at low temperatures.
In FNAcOH and FNHCl the chain−chain interactions lead to an intermediate stiffness, while in FAcOH the acetate counterion acts as a plasticizer, imparting more elasticity and flexibility to this film.
Especially in solid timber or glulam beams, knots lead to a decrease in stiffness and strength.
This does not lead to a decrease in resin stiffness or glass transition temperature and the favourable processability of epoxy resins is fully maintained without requiring the use of solvents.
These structure modifications lead to a significant improvement in the stiffness, hardness, and fracture energy of these coatings.
The idealised model lead to an overestimation of stiffness and strength compared to experiment due to the neglecting of yarn waviness, whereas the simulated geometry models produced more conservative results closer to experiment.
A very high value of \documentclass[12pt]{minimal} \usepackage{amsmath} \usepackage{wasysym} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{amsbsy} \usepackage{mathrsfs} \usepackage{upgreek} \setlength{\oddsidemargin}{-69pt} \begin{document}$$\lambda $$\end{document} λ, however, could lead to an ill-conditioned stiffness matrix.
This leads to a 3×3 stiffness matrix with coupling terms.
This model leads to: a 10×10 stiffness matrix coupling to each other the membrane strains, the bending and torsion curvatures, and the x and y-derivatives of the transverse shear strains; and a classical 2×2 transverse shear stiffness matrix.
In addition, more uniform damage growth throughout the specimen volume increased the specimen's capacity to accumulate damage, which led to a lower stiffness at failure, greater energy dissipation per cycle at failure and higher total dissipated energy of specimens subjected to interrupted loading.
This effect is attributed to the lengthening of fibers due to the increasing cyclic deformation that leads to a lower stiffness (Münster et al. 2013).
