Flexural creep in pure and filled acrylic resin systems

[摘要] The creep behavior of poly (methyl methacrylate) and acrylic polymer concrete (PC) systems based on methyl methacrylate was studied in flexure. Creep in both pure and filled systems followed a power law time dependence. A differential form of the power law equation was used to eliminate the irregularities associated with time-independent and transient strains in the experimental data. de$sb{m tot}$/dt = ln nk + (n $-$ 1) ln t where e$sb{m tot}$ is the total strain and n and k are constants in the power law equation. Plots of creep rates versus time yielded good linear fits to the data, the slopes providing values for ;;n;;, the power exponent. Vertical superposition was then used to reduce data at different stresses and resin contents, for the PCs onto a single master curve using different shift-factors. This data reduction was expressed in the form of an empirical expression: e(t, S, v) = e$sb0$(ref). EXP (K$sb{m S}$. (S $-$ S$sb{m ref}$)). EXP (K$sb{m v}$. (v $-$ v$sb{m ref}$)). t$sp{m n}$ which expresses the total creep strain as a product of separable functions of time (t), stress (S) and the resin volume fraction (v).

[发布机构] Rice University

[效力级别] Engineering