Parametric characterization of the Christopher–James–Patterson model for crack propagation in welded zone of A7N01 Aluminum alloys

IF 3.1 2区 材料科学 Q2 ENGINEERING, MECHANICAL
Xi Liu, Yaohui Lu, Qiushi Wang, Chuan Lu, Neil James
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Abstract

Aluminum alloy is a widely used material in railway vehicle structures. In order to accurately analyze the crack propagation mechanism of Aluminum alloy welding structures and predict their crack propagation life, this study focuses on the A7N01 Aluminum alloy and proposes a full-field strain solution method based on the least-squares method. For the first time, digital image correlation (DIC) experimental measurements are combined with the finite element analysis method to determine the shape and size of the plastic zone at the crack tip of the compact tension (CT) specimen. And it also calculates the crack propagation driving force parameters of the Christopher–James–Patterson (CJP) model using traditional crack propagation driving parameters. The research results revealed that the plastic zone at the crack tip captured by DIC experiments is in good agreement with the finite element simulation results. Additionally, the crack growth rate curve of the A7N01 Aluminum alloy, fitted based on the CJP model, is insensitive to the stress ratio. The results offer an effective approach to utilizing the da/dN-∆KCJP curve in analyzing A7N01 Aluminum alloy and welded structural failures, broadening the scope of engineering applications for the CJP model.

克里斯托弗-詹姆斯-帕特森模型对 A7N01 铝合金焊接区裂纹扩展的参数特性分析
铝合金是铁路车辆结构中广泛使用的材料。为了准确分析铝合金焊接结构的裂纹扩展机理,预测其裂纹扩展寿命,本研究以 A7N01 铝合金为研究对象,提出了基于最小二乘法的全场应变求解方法。首次将数字图像相关(DIC)实验测量与有限元分析方法相结合,确定了紧密拉伸(CT)试样裂纹尖端塑性区的形状和大小。同时还利用传统的裂纹扩展驱动力参数计算了克里斯托弗-詹姆斯-帕特森(CJP)模型的裂纹扩展驱动力参数。研究结果表明,DIC 实验捕捉到的裂纹尖端塑性区与有限元模拟结果非常吻合。此外,根据 CJP 模型拟合的 A7N01 铝合金裂纹生长率曲线对应力比不敏感。这些结果为利用 da/dN-∆KCJP 曲线分析 A7N01 铝合金和焊接结构故障提供了有效的方法,拓宽了 CJP 模型的工程应用范围。
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来源期刊
CiteScore
6.30
自引率
18.90%
发文量
256
审稿时长
4 months
期刊介绍: Fatigue & Fracture of Engineering Materials & Structures (FFEMS) encompasses the broad topic of structural integrity which is founded on the mechanics of fatigue and fracture, and is concerned with the reliability and effectiveness of various materials and structural components of any scale or geometry. The editors publish original contributions that will stimulate the intellectual innovation that generates elegant, effective and economic engineering designs. The journal is interdisciplinary and includes papers from scientists and engineers in the fields of materials science, mechanics, physics, chemistry, etc.
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