Residual stresses deteriorate strength of materials affecting the quality of industrial products. A removal or reduction of the residual stresses is an essential procedure in successful engineering component development. Effective and convenient methods are necessary for detection and evaluation of residual stresses. In this paper Hole Drilling Method is chosen for identification and a quantitative determination of the residual stresses in specimens of two groups under different laser welding speed conditions, 4.1m/min and 5.1m/min. The lap joints welded with STS 301L sheet of two different speeds were investigated along the welding line at two locations, the middle and the end location in the heat affected zone (HAZ). The identification of HAZ is carried out by taking hardness values from weld centerline to the raw material. Based on the experimental results and analysis, it is found that higher welding speed reduces the residual stresses. Also, the end location is found to be higher residual stress area compared with middle location due to the convective boundary condition. The residual stresses decrease as the depth increases from the top surface due to the lower heat input to depth increments.
In this paper, investigation focuses on preparing hybrid metal matrix composites of AlMg1SiCu alloy as base material by incorporating 9% SiC and varying 3 to 9 % of graphite particulates varying insteps of 3 by vortex method. The wear and frictional properties of metal matrix hybrid composites were studied by performing dry sliding wear test using pin on disc wear test apparatus as per ASTM standards G -99. Experiments were conducted based on the plan of experiments generated through Taguchi's technique. A L9 Orthogonal array was selected for analysis of data. Investigation to find the influence of applied load, sliding speed and track diameter on wear rate as well as coefficient of friction during wearing process was carried out using ANOVA. A mathematical model has been made for all cases that were studied depending on the method of least squares which helps in foretelling about the wear rate through the knowledge of limits as a variable with fixing the other variables Objective of the model was chosen as smaller the better characteristics to analyses the dry sliding wear resistance. The parametric studies indicate that on increase in the percentage of reinforcement; wear rate and coefficient of friction decreases.
This research is to develop high strength lightweight foam concrete; Foam concrete is also called as lightweight concrete. Light Weight foam concrete enables in reducing the dead weight of the total Structure. The foaming agent used in this research is an Animal base, to create foam for foam concrete. The consistency of foam concrete should be equal to 1000kg/m3. The compressive strength of the Light Weight Concrete varies from 6Mpa - 14Mpa. The main scope of the research is to increase the strength of the foam concrete by easily available sources. Foam concrete is an inventive applied science for viable construction in civil engineering applications. The property of foam concrete is to develop air bubbles with greater strength, stable during its manufacturing process by well mixing of ingredients, weathering condition on the site at the time of placing, and drying of concrete. The entire ratio is carried out only as trial mixes. The cube has been prepared for 7, 14, 28 days. Due to the presence of foam the cube should not be immersed in the water, only dry curing has been done. According to compressive strength result, the ratio which had the highest compressive strength can be used for both filling concrete and it can be used to create (Cellular Light Weight Concrete) CLC Blocks.
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