Phenol-formaldehyde Binder Research Articles

Modeling of the mechanical characteristics of chaotically reinforced GRP

Experimental results on the mechanical properties under tension and compression of composites based on a phenol-formaldehyde binder reinforced with short glass fibers are reported. Unidirectional structures, in which the reinforcing elements had different orientations with respect to the external load, were studied, as well as chaotically reinforced composites. In addition, the mechanical properties of the polymer matrix and of the reinforcing elements as well as the bond strength between them were also determined. An analysis of the results obtained in the tension experiments is presented, based on a model in which the frictional mechanism of interaction between the polymer matrix and the reinforcing elements is utilized. The quantitative relationships deduced give results agreeing with those obtained experimentally.

Influence of heating on the stability of fiberglass reinforced plastic shells during axial compression

Results are described of the experimental investigation of the patterns of change of carrying capacity and deformation of smooth thin-walled round cylindrical shells made from fiberglass reinforced plastic based on phenol-formaldehyde binder, loaded by an axial compressing force in a temperature field uniform with respect to the thickness of the wall and the surface. The experimental data are compared with calculated ones obtained according to the formulae of the theory of orthotropic shells. The influence of circumferential compressing stresses arising in the junction zone of the heated wall with less heated thicker parts at the edges (ribs) on the carrying capacity of the shells is evaluated.

Limiting loads of thin-walled glass-reinforced plastic cylinders in torsion

The article presents the results of an experimental investigation of the regularities of the change of the load-bearing capacity and deformation properties of smooth thin-walled cylinders of glass-reinforced plastic on a phenol formaldehyde binder loaded on the ends by twisting moments at normal and elevated temperature. Integral methods are used for calculating the limiting loads in the case of a temperature field varying over the thickness of the wall. The calculation results are compared with the experimental data.