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首页> 外文期刊>Proceedings of the institution of mechanical engineers >Experimental and finite element analysis of mechanical and fracture behavior of SiC particulate filled A356 alloy composites: Part I
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Experimental and finite element analysis of mechanical and fracture behavior of SiC particulate filled A356 alloy composites: Part I

机译：SiC颗粒填充A356合金复合材料力学和断裂行为的实验和有限元分析：第一部分

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摘要

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 0wt.% to 25wt.% at a range of 5wt.%, respectively. The spherical shaped SiC particles of 60 mu m 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 25wt.% SiC filled A356 alloy composite was found to be 150.55MPa and 315.94MPa, respectively. Impact energy of the SiC filled A356 alloy composite also increased from 3.92J at 0wt.% to 7.82J at 25wt.% SiC. It was established that the stress intensity factor for unfilled and SiC filled A356 alloy composites increases with the increased crack length for 0-25wt.% 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.
机译：在本研究中，使用搅拌铸造技术通过在5wt。％的范围内分别将SiC的重量百分比从0wt。％更改为25wt。％来制造填充碳化硅（SiC）的铸铝（A356）合金复合材料。用机械搅拌器将60μm大小的球形SiC颗粒与半固态合金均匀混合。对SiC填充的A356合金复合材料的物理机械性能以及断裂韧性进行了实验评估，并与有限元分析结果进行了比较，以验证其有效性。发现A356合金复合材料的空隙率从1.01％变化到2.69％，硬度从21.25HRB变化到33HRB，并且SiC重量％从0％增加到25％。发现在25wt。％的SiC填充的A356合金复合材料中，杨氏模量和弯曲强度的最大实验值分别为150.55MPa和315.94MPa。 SiC填充的A356合金复合材料的冲击能量也从0wt。％时的3.92J增加到25wt。％SiC时的7.82J。可以确定的是，对于0-25wt。％SiC含量，未填充和SiC填充的A356合金复合材料的应力强度因子随裂纹长度的增加而增加。通过在ANSYS中使用适当的边界条件，通过三维（3D）晶胞模型模拟复合材料的拉伸和弯曲行为。最后，使用单侧边缘裂纹试样在紧凑张力下的二维模拟，确定裂纹扩展的应力强度因子。通过实验和有限元方法计算的抗张强度和断裂韧性的最大百分比误差分别为5.74％和7.69％，在可接受的范围内。

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