This work evaluated experimentally the fatigue stress behavior of two types of composite material (SIR-epoxy resin with woven E-glass fiber as reinforcement and SIR-epoxy resin with random E-glass fiber as reinforcement) subjected to shot peening (2, 4 and 6 min) through three different times of solidification of samples (two, four and six days). The results show that, for woven reinforced composite, the great improvement in fatigue stress was obtained at both two and six days of solidification with (2, 4 and 6) min of shot peening times (SPTs) in which the percentage of the maximum enhancement was 59.38% in fatigue stress (at two days of solidification and 6 min shot peening time). For random reinforced composite the great improvement of fatigue stress was obtained at two and six days of solidification with (2, 4 and 6) min of shot peening times (SPTs) in which the percentage of the maximum enhancement was 33.78% (at two days solidification and 6 min shot peening). After four days of solidification, increasing shot peening time will decrease the fatigue stress for both types of composite materials (woven reinforcement and random reinforcement) and the maximum decreases in fatigue stresses at 6 min of shot peening was -43.06% and -28.9% for woven composite and random composite respectively. The tensile test and the fatigue test were done after full solidification of all the patterns.
An experimental investigation of different thermal energy storage materials in the solar collector is studied in this paper. Both, sensible energy storage materials and latent heat storage materials (PCMs) are used to enhance the storage system of thermal energy. The size of the tested solar collector 2 m*0.8m*0.15 collector length, width, height. Experimental results obtained from the proposed model indicate that the solar collector model, having a composite of paraffin wax with 5% aluminum powder can continuous operation, and the maximum air temperature difference (ΔT) between air enter to collector and exit from the collector if the ambient of 24.7 °C, the effect on the efficiency of the collector
In this study, the influences of eggshell powder application on random fiberglass/polyester composite pipes thermal stresses were investigated experimentally and numerically. The experimental part involved industrializing tube samples which are Egg Shell Powder with Polyester at 50% volume fraction.(E50), Random Fiberglass with plyester at 50% volume fraction (F50) and Egg Shell Powder with Random Fiberglass with Polyester at 50% volume fraction (E25F25). Resin molding procedure and experimental rig design to study how tube samples are faced with thermal loads. Pipes are made with (95 mm) inner diameter, (400 mm) circumference, and (5 mm) wall thicknesses. Computational Fluid Dynamic, ANSYS software package version 11, is simulated with product form SHELL63. Results show that, composite samples (F50) had an average longitudinal strain, while composite samples (E50) had a low longitudinal strain. The composite (F50) had average longitudinal and hoop stress (62.2 MPa, and 61.1 MPa) respectively, while the composite (E50) had low longitudinal hoop stress (28.5 MPa, ad 30.8 MPa) respectively.
This work is an experimental and numerical approach to analyze the effect of Nano powder additives and temperature on the critical crack length in fiber reinforced composite materials (FRC) exposed to uniaxial tensile load. Fiberglass/Epoxy compact tension test samples (CT) are prepared according to ASTM standard E399 . Tio2 Nano powder is added by 2% wt to the resin to other samples. The static tensile test is applied to the samples and the results for crack length/time are discussed. ABAQUS/CAE software is used to simulate the case. The numerical and experimental results were close. The experimental results showed that the addition of 2%wt Tio2 Nano powder increased the critical crack length by 32.4%. The effect of ambient temperature is studied too by applying the experimental test on the fiberglass/Epoxy samples in room temperature (30°C) once and at outdoor (60°C) temperature. The results showed that the effect of the temperature increase decreased the critical crack length by 51%. The numerical results determined the fracture toughness (KIC) for the fiberglass/Epoxy samples to be 491 pa.mm0.5 and 517 pa.mm0.5 for the fiberglass/Epoxy-Nano powder samples.
The aim of the research is to investigate the ability of improving the vehicle safety, performance, and reduce operating coast by using nitrogen inflated tires. In this study, three cases were proposed to study the effect of Nitrogen Tires on Car Vibration and Fuel Consumption. The study was conducted according to the three cases; filling the tires with air only, 50% air and 50% nitrogen and nitrogen only. When adding 50% of the nitrogen with the air to the tires, it reduced the vibration velocity to 10% at 60 km/h, 6.6%at 80 km/h and 7.5% at 100 km/h. Also when filling tires with nitrogen, it reduced the vibration velocity to 28.4% at 60 km/h, 23.6% at 80 km/h and 22.7% at 100 km/h. The decrease in fuel consumption for the addition of 50% of the nitrogen was 4.05% while the addition of nitrogen by 100% was 6.1%.
The UV-radiation effect on fatigue behaviour of natural composite materials was investigated experimentally. The egg shell -polyester, date nuclei -polyester, and palms leaf -polyester were used in this experiment using (20 %, 40%, and 60%) volume fraction. The samples were affected on UV-radiation for three different times (100 hour, 300 hour, and 500 hour). The mechanical properties of natural composite samples (with and without UV-radiation) were found. The fatigue test for natural composite samples was done. The resultant shows that, the increasing volume fraction causes increasing of endurance stress of natural composite materials. The palm leaf -polyester samples have mechanical properties better than egg shell -polyester and date nuclei -polyester samples. The increasing time of UV-radiation causes reduction in endurance and tensile stresses. The greatest and smallest reduction in stress endurance due to UV-radiation occurs in palm leaf and nuclei natural samples. The date nuclei natural composite material has goodresistance to UV-radiation under fatigue effect.
This study focused on the electrical and thermal properties of many natural composite material specimens. In this study, three kinds of composite materials were used epoxy, jute, and fibreglass. The first type was epoxy-strengthened glass fibre with volume fraction (50%), the second type of Hybrid natural jute, and glass fibre strengthened epoxy of (50%) thickness proportion (25%glass fibre + 25 %jute). Finally, the third type of natural fibre (jute) was strengthened with a volume fraction of epoxy (50%). This research was studied the thermal and electrical conductivity for three types of composite. Results revealed that the values of thermal conductivity and electrical conductivity for fibreglass/epoxy composite samples outweigh two other forms.
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