复合材料的疲劳寿命预测使用应变分布图像和深度卷积神经网络
Yuta Mizuno1, Atsushi Hosoi2,3, Hiroyuki Koshita4
1Department of Applied Mechanics and Aerospace Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo, 169-8555, Japan.
Scientific reports
|October 25, 2024
概括
这项研究将数字图像相关性与卷积神经网络 (CNN) 结合起来,以准确地预测短纤维增强塑料 (SFRP) 的疲劳寿命. 在视觉检查之前,CNN模型已经确定了材料的断裂点.
科学领域:
- 材料科学 材料科学 材料科学
- 机械工程 机械工程
- 人工智能的人工智能
背景情况:
- 复合材料损坏,就像短纤维增强塑料 (SFRP) 一样,是复杂的,需要准确的建模来预测疲劳寿命.
- 现有的方法可能无法完全捕捉到对于可靠的疲劳评估至关重要的复杂损伤演变过程.
研究的目的:
- 用先进的计算技术开发和验证SFRP中疲劳寿命预测的新方法.
- 研究将数字图像相关性 (DIC) 与卷积神经网络 (CNN) 结合用于损伤分析的有效性.
主要方法:
- 使用数字图像相关性 (DIC) 方法,一种非破坏性测试技术,以捕获材料变形.
- 使用一个卷积神经网络 (CNN) 与Xception架构用于疲劳寿命预测和损伤分析.
- 应用梯度加权类激活映射 (Grad-CAM) 用于模型解释性和关键损伤区域的可视化.
主要成果:
- 在相同的SFRP标本上训练和测试CNN模型时,获得了高预测准确度.
- 当使用不同的标本进行培训和测试时,观察到精度较低,这表明需要更大的数据集.
- 美国有线电视新闻网 (CNN) 的模型成功地从早期阶段确定了断裂点,作为一个关键的兴趣区域,在视觉检测之前.
结论:
- 综合的DIC-CNN方法显示出在复合材料中准确预测疲劳寿命的巨大潜力.
- CNN模型可以比传统的视觉检查更早地检测到关键损坏点,为损坏观察提供了一个新的范式.
- 建议增加样本数量的进一步研究,以提高模型的通用性和稳定性.
相关概念视频
01:22Fatigue Strength of Concrete
171
Fatigue, in the context of materials science and engineering, refers to the weakening or failure of a material caused by repeatedly applied loads, even if these loads are below the strength limit of the material. Fatigue strength in concrete is a critical property that influences its durability and longevity. Concrete can fail in two ways due to fatigue. Static fatigue or creep rupture occurs under a constant load or one that increases slowly. The other failure mode is due to cyclical or...
171
01:21Fatigue
174
Fatigue occurs when materials rupture under repeated or fluctuating loads, even at stress levels far below their static breaking strength. It typically results in brittle failure, even for ductile materials. It is a critical consideration in designing machines and structural components subjected to repetitive or varying loads. The nature of these loadings can range from fluctuating loads like unbalanced pump impellers causing vibrations to repeatedly bending a thin steel rod wire back and forth...
174
01:29Three-Dimensional Analysis of Strain
203
Three-dimensional strain analysis is crucial for understanding how materials deform under stress, particularly in elastic, homogeneous materials. This method employs principal stress axes to simplify complex stress states into more understandable forms. Subjected to stress, a small cubic element within a material either expands or contracts along these axes, transforming into a rectangular parallelepiped. This transformation effectively illustrates the material's deformation. The principal...
203
01:24Stress-Strain Diagram - Ductile Materials
638
The stress-strain relationship in ductile materials such as structural steel or aluminium is intricate and progresses through several stages. When a specimen is loaded, it initially exhibits a linear length increase, depicted by a steep straight line on the stress-strain diagram. It indicates the material is elastically deforming and will return to its original shape once unloaded. However, when a critical stress value is reached, plastic deformation begins. This stage sees substantial...
638
01:28True Stress and True Strain
276
Engineering stress is calculated as the load divided by the original, undeformed cross-sectional area. It approximates a material under load. This approximation is especially relevant post-yield in ductile materials. Though engineering stress-strain diagrams are often used for their convenience and accessibility, they can sometimes fall short in accuracy, particularly when dealing with large strain values.
In contrast, true stress offers a more precise portrayal. It is computed by dividing the...
In contrast, true stress offers a more precise portrayal. It is computed by dividing the...
276
01:20Strain-Energy Density
370
Understanding the strain energy density in materials under axial load is crucial for evaluating their mechanical behavior and durability. When a rod is subjected to such a load, it elongates and stores energy, known as strain energy, as potential energy within the material. This energy is measured in terms of energy per unit volume.
In the elastic region of a material, the relationship between the stress and the strain is linear and follows Hooke's Law. The strain energy density in this...
In the elastic region of a material, the relationship between the stress and the strain is linear and follows Hooke's Law. The strain energy density in this...
370