5754 铝合金在四点弯曲下的疲劳裂纹扩展

Q4 Physics and Astronomy
M. Makhatha, Pawan Kumar, D.A. Baruwa
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引用次数: 0

摘要

铝 5754 合金是船运、铆钉制造、花纹板和汽车行业广泛使用的工程材料之一。这些工程结构在使用过程中承受着不同的负载条件。此外,它还会经历地震振动。因此,由此类铝合金制成的工程部件很容易发生疲劳断裂。在当前的研究中,使用指数函数对 5754 铝合金的疲劳裂纹增长(FCG)进行了预测。横梁试样的横截面为 25X25 mm2,跨度为 300 mm,中心的机械缺口长度为 2.70 mm,采用液压 INSTRON 8800 拉伸试验设备对其进行四点弯曲(FPB)试验。周期性加载条件使材料产生了较大的塑性变形。施加的载荷进一步降低了材料的弹性。实验数据提供了裂纹长度(a)与失效循环次数(N)之间的关系。采用响应面方法(RSM)和修正的指数方程来预测 FCG。在 RSM 中,当 "应力强度因子 (K)" 和 "循环次数 (N)" 被视为自变量时,与 "应力强度因子范围 (del K) "和 "疲劳裂纹生长率 (da/dN)" 被视为自变量时相比,响应 (a) 最佳(最大)。因此,在设计作为工程结构的铝 5754 合金时,与 da/dN 相比,循环次数更能提供安全的设计。修正的指数方程使用指数函数预测了铝 5754 合金梁试样形式的 FCG。预期结果与实验数据一致,预测比为 1.20,偏差为 3.7%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Fatigue Crack Propagation in 5754 Aluminum Alloy under Four-Point Bending
The aluminum 5754 alloy is one of the widely used engineering materials in shipping, rivet making, tread plates and automotive industries. These engineering structures envisage variable loading conditions during their service. In addition to it, it is also experiencing seismic vibrations. Hence, the engineering components made from such aluminum alloy are susceptible to fatigue fracture. In the current study, the prediction of fatigue crack growth (FCG) in 5754 aluminum alloy was made using the exponential function. The beam specimen comes up with a cross-section of 25X25 mm2, a span length of 300 mm with a mechanical notch length of 2.70 mm at the centre was subjected to four-point bending (FPB) employing hydraulic INSTRON 8800 tensile testing apparatus. The periodic loading condition deformed the material up to large plastic deformation. The applied load was further down the elasticity of the material. The experimental data provided the relation between crack length (a) to the number of cycles (N) to failure. The response surface methodology (RSM) and modified exponential equation were used to predict the FCG. In RSM, when “stress intensity factor (K)” and “number of the cycle (N)" were considered independent variables, the response (a) was optimum (maximum) as compared to when “stress intensity factor range (del K)” and “fatigue crack growth rate (da/dN)” were considered independent variables. Hence, for designing the aluminum 5754 alloys as engineering structures, it was the number of cycles which provides a safe design as compared to da/dN. The modified exponential equation using an exponential function predicted the FCG for aluminum 5754 alloy in the form of a beam specimen. The anticipated results agreed with experimental data as the prediction ratio was 1.20 and the % deviation was 3.7.
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来源期刊
Defect and Diffusion Forum
Defect and Diffusion Forum Physics and Astronomy-Radiation
CiteScore
1.20
自引率
0.00%
发文量
127
期刊介绍: Defect and Diffusion Forum (formerly Part A of ''''Diffusion and Defect Data'''') is designed for publication of up-to-date scientific research and applied aspects in the area of formation and dissemination of defects in solid materials, including the phenomena of diffusion. In addition to the traditional topic of mass diffusion, the journal is open to papers from the area of heat transfer in solids, liquids and gases, materials and substances. All papers are peer-reviewed and edited. Members of Editorial Boards and Associate Editors are invited to submit papers for publication in “Defect and Diffusion Forum” . Authors retain the right to publish an extended and significantly updated version in another periodical.
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