Thermo-mechanical and crack position on stress intensity factor in particle-reinforced Zinc–aluminium alloy composites

Proceedings of the Institution of Mechanical Engineers, Part L:

2013

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In the present study, silicon carbide (SiC) filled cast aluminum (A356) alloy composites were fabricated using stir casting technique by varying SiC weight percentages from 0 wt.% to 25 wt.% at a range of 5 wt.%, respectively. The spherical shaped SiC particles of 60 mm size were uniformly mixed with the semi-solid alloy by mechanical stirrer. The physical and mechanical properties along with the fracture toughness of SiC filled A356 alloy composite were evaluated experimentally and compared with finite element analysis results for the validation purpose. It was found that the void content of A356 alloy composites varied from 1.01% to 2.69% and hardness from 21.25 HRB to 33 HRB with the increased SiC wt.% from 0% to 25%. The maximum experimental value of Young's modulus and flexural strength at 25 wt.% SiC filled A356 alloy composite was found to be 150.55 MPa and 315.94 MPa, respectively. Impact energy of the SiC filled A356 alloy composite also increased from 3.92 J at 0 wt.% to 7.82 J at 25 wt.% SiC. It was established that the stress intensity factor for unfilled and SiC filled A356 alloy composites increases with the increased crack length for 0-25 wt.% SiC content. The tensile and flexural behavior of the composite is simulated by three-dimensional (3D) unit cell model using appropriate boundary condition in ANSYS. Finally, stress intensity factor for the crack propagation is determined using 2D simulation of single side edge cracked specimen in compact tension. The maximum percentage error for tensile strength and fracture toughness as calculated experimentally and by finite element method was found to be 5.74% and 7.69%, respectively, which is within the acceptable range.

Section: Effect Of Varying Wt% Of Sic On Void Content Of A356 Alloy Compositesmentioning

confidence: 99%

Experimental and finite element analysis of mechanical and fracture behavior of SiC particulate filled A356 alloy composites: Part I

Proceedings of the Institution of Mechanical Engineers, Part L:

2013

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“…However, in the poro sity in the composites and improved the bonding force between the aluminum alloy and Al 2 O 3 filler particles. For 2024 aluminum alloy MMCs with Al 2 O 3 filler particles, the density of the composites increased with increasing weight percentage and size of the particles, whereas the porosity of the composites increased with decreasing size and increasing weight percentage of the particles [9] . Cocen and Onel [10] studied the effect of volume fractions on void content in the matrix alloy and found that the void content varied from 0.18 vol.-% for the matrix alloy to 4.6 vol.-% for AlSi 5 / silicon carbide (SiC)/26p composite in the as cast condition.…”

Section: Effect Of Void Content On Tio 2 -Filled A384 Alloy Compositesmentioning

confidence: 97%

“…The decrease in flexural strength may have affected the structural properties of the composites due to an increase in pores inside the particulate-filled composites with the increase in microTiO 2 contents. Mamtha et al[9] studied Al 2 O 3 -filled zincaluminum (ZA-27) alloy matrix composites and found that the magnitude of flexural strength decreased with increases in alumina reinforcement in ZA-27 alloy composites. A possible reason for the decrease in flexural strength of the said composites with the addition of reinforcement is the presence of void contents in the composites that lead to poor strength because of insufficient matrix particulate bonding.…”

mentioning

confidence: 98%

Mechanical and fracture toughness behavior of TiO2-filled A384 metal alloy composites

Science and Engineering of Composite Materials

et al. 2013

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In the present study, A384 alloy composites filled with titanium dioxide (TiO 2 ) were fabricated by the stir casting technique by varying the filler percentages from 0 to 8 wt.-% at an interval of 2 wt.-% , respectively. This study focused on the physical, mechanical, and fracture behavior of unfilled and particulate-filled alloy composites. Void content ( % ) and hardness were found to increase from 2.22 % to 3.02 % and from 35.5 to 62.5 Hv, respectively, with the increased filler contents (0 to 8 wt.-% ) for the micro-TiO 2 -filled A384 metal alloy composite. However, mechanical properties such as tensile strength, tensile modulus, and flexural strength showed a decreasing trend for experimental and finite element simulated results. An X-ray diffraction technique was used to study the constituent material present in the composites. The stress intensity factors of the fabricated composites were studied both experimentally and by the finite element method technique. The highest value of stress intensity factor was observed to be 40 MPa.vm for 4 wt.-% micro-TiO 2 -filled alloy composite at 9-mm crack length. A three-dimensional simulation of the fabricated composite using the unit cell model was developed in ANSYS using appropriate boundary conditions for tensile and flexural strength.

“…Similar observations are also reported by other researchers for both particulate filled metal alloy and polymer matrix composites. [21][22][23][24][25]…”

Section: Effect Of Varying Wt% Of Al 2 O 3 On Void Content Of A356 Alloy Compositementioning

confidence: 99%

Experimental and finite element analysis of mechanical and fracture behaviour of Al₂O₃ particulate-filled A356 alloy composites: Part II

Proceedings of the Institution of Mechanical Engineers, Part L:

2013

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In the present work, alumina (Al 2 O 3 )-filled cast aluminium alloy (A356) composites were fabricated using stir casting technique by varying Al 2 O 3 contents (0, 5, 10, 15, 20 and 25 wt.%). The fabricated composites were studied for their physical, mechanical and fracture toughness behaviour experimentally, theoretically and compared with finite element analysis method to validate the experimental and theoretical results. The physical and mechanical results showed that the addition of alumina to A356 alloy led to the improvement in tensile strength, flexural strength, hardness and impact strength. The void content of A356 alloy composites increased from 1.01% to 3.30% from 0 to 25 wt.% Al 2 O 3 . Young's modulus value varied from 80 GPa to 111.27 GPa at 0 to 25 wt.% Al 2 O 3 filled A356 alloy composite. The maximum value of flexural strength as calculated experimentally is found to be 389 MPa at 25 wt.% Al 2 O 3 . A 3D simulation of the composite using the unit cell model was developed in ANSYS using appropriate boundary conditions for tensile and flexural strength. Stress intensity factor for the crack propagation is determined using 2D simulation of the single side edge cracked plate in compact tension. The mechanical properties determined in papers I and II are used for the optimization purpose. Technique for order preference by similarity to ideal solution was applied to rank the composites using criteria based on mechanical properties like tensile strength, Young's modulus, flexural strength and stress intensity factor. As per the results obtained from the optimization, the composite with 25 wt.% SiC exhibits the optimal properties.