Relationship between fiber orientation and the materials youngs modulus?
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... Young’s modulus of composites is found to increase with increase in fiber orientation irrespective of fiber loading. On the other hand with increase in fiber loading the Young’s modulus gradually goes on decreasing irrespective of fiber orientation as observed in Fig. 2. The maximum Young’s modulus is obtained for composites with 30% of fiber loading and 60 o fiber orientation. The possible reason of increase in tensile strength and modulus may be the proper adhesion between fiber and matrix in case of composite with 30% fiber contents. With 0 o fiber orientation, when fiber loading increased from 30% to 40%, tensile strength decreased by 3.67% and when fiber loading increased from 40% to 50%, tensile strength further decreased by 22.13%. With 30 o fiber orientation, when fiber loading increased from 30% to 40%, tensile strength decreased by 6.62% and when fiber loading increased from 40% to 50%, tensile strength decreased by 4.96%. With 60 o fiber orientation, when fiber loading increased from 30% to 40% tensile strength decreased by 2.87% and when fiber loading increased from 40% to 50%, tensile strength decreased by 7.69%. With 30% fiber loading and when orientations changed from 0° to 30° , tensile strength increased by 11.02% and when orientations changed from 30° to 60°, tensile strength increased by 15.23%. With 40% fiber loading and when orientations changed from 0° to 30°, tensile strength increased by 7.63 % and when orientations changed from 30° to 60°, tensile strength increased by 19.85%. With 50% fiber loading and when orientations changed from 0° to 30° , tensile strength increased by 31.37% and when orientations changed from 30° to 60°, tensile strength increased by 16.41%. The effect of fiber loading and fiber orientation on the flexural strength and modulus of composites is revealed in Fig. 3 and Fig. 4 respectively. It is clear that both fiber content and fiber orientation is having a significant effect on flexural ...
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... absorption studies were performed according to ASTM D570-98 standard. Humidity chambers (desiccators) were set up at 100% humidity using water. The specimens were dried in hot air oven at 60 o C for 24 h, weighed on a balance accurate to 4 decimal places (± 0.1 mg) and were then placed in the humidity chamber. The humidity chamber was held at room temperature. After 24 h, specimen was taken out of the humidity chamber and excess water was carefully mopped with filter paper. Finally, the moisture absorption was calculated by the weight difference. The weight gain in percentage of the samples was measured at regular time intervals of time by using the following equation: Where W is weight gain, W t is the weight of the specimen at a given immersion time, and W is the weight of the dry sample. The effect of fiber loading and fiber orientation on the tensile strength and Young’s modulus of the composites is shown in Fig. 1 and Fig. 2 ...
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... is obvious from Fig. 1 that the tensile strength of the composites decreases with increase in fiber loading and orientation with few exceptions. This is because of poor adhesion between fiber and matrix. The maximum tensile strength is observed for composite with 30% fiber loading and 0° fiber orientations. With 0 o fiber orientation, when fiber loading increased from 30% to 40%, tensile strength decreased by 23.90% and when fiber loading increased from 40% to 50%, tensile strength further decreased by 18.46%. With 30 o fiber orientation, when fiber loading increased from 30% to 40%, tensile strength decreased by 27.53% and when fiber loading increased from 40% to 50%, tensile strength increased by 10.73%. With 60 o fiber orientation, when fiber loading increased from 30% to 40%, tensile strength decreased by 20.29% and when fiber loading increased from 40% to 50%, tensile strength increased by 12.54%. With 30% fiber loading and when orientations changed from 0 o to 30°, tensile strength decreased by 18.36% and when orientations changed from 30° to 60°, tensile strength decreased by 32.72%. With 40% fiber loading and when orientations changed from 0° to 30°, tensile strength decreased by 22.25 % and when orientations changed from 30° to 60°, tensile strength decreased by 25.99%. With 50% fiber loading and when orientations changed from 0° to 30°, tensile strength increased by 5.58% and when orientations changed from 30° to 60°, tensile strength decreased by 24.79%. Young’s modulus, also called as tensile modulus is an important characteristic of materials which is a measure of stiffness of the material. It is the tendency of the material to deform along an axis when opposing forces are applied along that axis.