Compression test for composite resin with fiber-reinforced composite substructure

Abstract Objectives: The aim of this study was to determine static load-bearing capacity and compressive fatigue limits (CFL) of laboratory particulate filler composite resin (PFC) with three different types of fiber reinforced composites (FRC) substructures. Methods: Total of 420 test specimens were prepared having 1.0 mm of FRC layer as substructure (short random , continuous unidirectional and bidirectional fiber orientations), and 2.0 mm thick surface layer of PFC. Control specimens were prepared from plain FRC or PFC. The specimens (n=15) were either dry stored or water stored (37 °C for 2 weeks) before they were loaded with a steel ball (Ø 3.0mm) under static load until fracture and cyclic load with maximum controlled regimen following a staircase approach with maximum 103 cycles. The decrease of CFL compared to static load was calculated and data was analyzed using ANOVA and Weibull statistics. Results: The highest static loads were registered for plain FRC specimens (short random 1842N, continuous bidirectional 2258N and unidirectional fiber orientation 538N). The specimens with FRC substructure and PFC coverage gave load values of 1517N, 1670N and 677N, respectively. The specimens made of PFC only, failed with 1047N load. The CFL for 103 cycles ranged between 19 and 39 % of the static load values. ANOVA revealed that all factors affected significantly on the load bearing capacity (p<0.001). Conclusions: The results suggested that the material combination of continuous bidirectional or random FRC and PFC, gave higher CFL and static load-bearing capacity than obtained with plain particulate filler composite resin.