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Applied Composite Materials: An International Journal for the Science and Application of Composite Materials (v.15, #1)
Progressive Failure Modeling for Dynamic Loading of Woven Composites by Liqun Xing; Kenneth L. Reifsnider (pp. 1-11).
A three parameter constitutive model was developed for representing tensile progressive damage of the nonlinear large-deformation rate-dependent behavior of polymer-based composite materials, which was characterized using off-axis composite specimens. A strain based failure criterion was proposed that reduces data for different loading directions and strain rates to a single representation. A method of combining the nonlinear constitutive theory and the failure strain methodology for different strain rates is suggested. The strength of the material was successfully represented with a single material constant, for all strain rates and tensile loading directions.
Keywords: Progressive failure; Nonlinear modeling; Monkman–Grant; Strain rate
Abrasive Wear Volume Maps for PA6 and PA6 Composites Under Dry Working Condition by A. Mimaroglu; U. Sen; H. Unal (pp. 13-25).
In this study the wear volume map is obtained and considered for evaluation of the abrasive wear performance for polyamide (PA6) and PA6 composites. Polyamide composites were tailored using 25 wt.% glass bead, 20 wt.% talc and 30 wt.% wollastonite fillers. In this work, the influence of filler materials, abrasion surface roughness and applied loading values on abrasive wear performance of PA6 and PA6 composites were evaluated. Experimental abrasive wear tests were carried out at atmospheric condition using pin-on-disc rig arrangement. Tests were performed under 4, 6, 8 and 10 N load values, traveling speed of 1 m/s and abrasion surface roughness values of 5, 20 and 45 μm. Wear volume maps were obtained and the results showed that the lowest wear volume rate for PA is reached using glass bead filler. Furthermore, the results also showed that the higher is the applied load and the roughness of the abrasion surface, the higher is the wear rate. Finally it is also concluded that abrasive wear process mechanism include ploughing mechanism and delimitation of filler tips.
Keywords: Abrasive; Wear volume map; PA6 composites
Filament Winding of Co-Extruded Polypropylene Tapes for Fully Recyclable All-Polypropylene Composite Products by N. O. Cabrera; B. Alcock; E. T. J. Klompen; T. Peijs (pp. 27-45).
The creation of high-strength co-extruded polypropylene (PP) tapes allows the production of recyclable “all-polypropylene” (all-PP) composite products, with a large temperature processing window and a high fibre volume fraction. Available technologies for all-PP composites are mostly based on manufacturing processes such as thermoforming of pre-consolidated sheets. The objective of this research is to assess the potential of filament winding as a manufacturing process for all-PP composites made directly from co-extruded tapes or woven fabric. Filament wound pipes or rings were tested either by the split-disk method or a hydrostatic pressure test in order to determine the hoop properties, while an optical strain mapping system was used to measure the deformation of the pipe surfaces.
Keywords: Thermoplastic composites; Self reinforced composites; Filament winding; Recycling; Polypropylene
Experimental Investigation on the Co-Cure Processing of Honeycomb Structure with Self-Adhesive Prepreg by Chongxin Yuan; Min Li; Zuoguang Zhang; Yizhuo Gu (pp. 47-59).
To optimize the co-cure processing of honeycomb sandwich composites, three parameters, namely the ramp rate, pressure and application time of pressure were varied. Meanwhile, the inner pressure profile was on-line monitored to reveal the influence mechanism the final quality of the samples. Fillet size, resin content and porosity were used to characterize the bonding performance and panel quality. In addition, the climbing drum peeling strength was applied to characterize the interfacial bonding performance of the sandwich structure. It is found that product with the good fillet and little void content in the panels can be obtained by applying pressure of 0.4 MPa after holding 50 min at 100 °C; plus force induced by the surface tension partly contributes to the formation of fillets; ramp rate of temperature has a significant influence on the quality of the panel and gas permeation of the panels should be considered during the optimization of operating conditions.
Keywords: Honeycomb sandwich structure; Co-cure process; Resin flow; Self-adhesive