Abstract
In this study, Laser Shock Peening (LSP) effect on the polymeric composite materials has been investigated experimentally. Polymeric composite materials are widely used because they are easy to fabricate and have many attractive features. Unsaturated polyester resin as a matrix was selected and Aluminum powder with micro particles as a reinforcement material was used with different volume fraction (2.5%, 5% and 7.5%). Hand lay-up process was used for preparation the composites. Fatigue test with constant amplitude with stress ratio (R =-1) was carried out before and after LSP process with two levels of energy (1Joule and 2Joule). The result showed an increase in the endurance strength of 25.448% at 7.5% volume fraction when peened is 1J laser energy. Also, the ultimate strength and Young’s modulus were increased by 6.474% and 10.588% respectively after LSP with the same laser energy. On the other hand, composites with (2.5% and 5%) volume fraction manifested a reduction in the mechanical and fatigue strength especially when treated by 2J laser energy.
Highlights
Many researches have been prepared to study the composite materials and the enhancement of mechanical and fatigue properties
Composite materials are defined as the mixture of two or more constituents, and this is usually done at the microscopic scale without any soluble of one into another [1]
Figure (7) show the stress- strain curves for composite at 5% Al, and as clear, when 1J laser energy was used for Laser Shock Peening (LSP) the mechanical properties slightly not affected, but it decreased with amount approximately smaller than that observed with 2.5% volume fraction after the increasing of laser beam energy to 2J
Summary
Many researches have been prepared to study the composite materials and the enhancement of mechanical and fatigue properties. M. Shareef [6] studied the effect of conventional shot peening on the fatigue life and mechanical properties of composite materials. Al- Khazraji et al [7] investigated of the shot peening effect on fatigue and mechanical properties of two types of composite materials. Jubier et al [11] studied the effect of ultraviolet on the fatigue behavior of composite materials, by using epoxy with SiOଶ nanoparticles and different volume fractions (1%,3%,5%,7% and 10%) reinforced with 6 layers of chopped mat E-glass fiber. In this research paper will be investigated the influence of laser peening with water confined layer on mechanical and fatigue properties of polymeric composites reinforced by fillers
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