Evaluation of Mixed-Mode Stress Intensity Factors Using a Small Punch Specimen with a Circular Crack: Preliminary Experiment and an Estimation of Stress Intensity Factors

IF 1.9 4区工程技术 Q2 Engineering

International Journal of Precision Engineering and Manufacturing Pub Date : 2024-09-10 DOI:10.1007/s12541-024-01113-5

Un Bong Baek, Kyung-Oh Bae, Tuan Anh Bui, Thanh Tuan Nguyen

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Abstract

Cracks often develop under complex loading conditions in practical applications, frequently leading to mixed-mode fracture scenarios. Therefore, accurately predicting fracture conditions, specifically the mixed-mode stress intensity factor (SIF) values and their influences, is crucial for assessing structural integrity. Based on preliminary empirical findings from a literature review of the fracture responses of various materials during small punch (SP) tests under different environmental conditions, we propose a model featuring a circular crack positioned on the bottom surface of the SP specimen to evaluate the I/II mixed-mode SIF. Preliminary results from experimental tests using the proposed model demonstrate its feasibility for replicating fracture behavior and determining mixed-mode SIF values. An analytical estimation of the SIF equation for mode-I and mode-II loading will be conducted using elastic finite element analysis. The effects of crack geometry parameters, including the crack ratio (a/t) and the radius of the circular crack, on the mixed-mode fracture parameter were investigated.

Graphical Abstract

Abstract Image

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使用带有圆形裂纹的小冲压试样评估混合模式应力强度因子：初步实验和应力强度因子估算

在实际应用中，裂缝往往是在复杂的加载条件下产生的，经常导致混合模式断裂情况。因此，准确预测断裂条件，特别是混合模式应力强度因子（SIF）值及其影响因素，对于评估结构完整性至关重要。根据对各种材料在不同环境条件下进行小冲压（SP）试验时断裂响应的文献综述得出的初步经验结论，我们提出了一个模型，该模型的特点是在 SP 试样的底面设置了一个圆形裂缝，用于评估 I/II 混合模式 SIF。使用该模型进行的实验测试的初步结果表明，该模型在复制断裂行为和确定混合模式 SIF 值方面具有可行性。将利用弹性有限元分析对模式 I 和模式 II 加载的 SIF 方程进行分析估算。研究了裂纹几何参数（包括裂纹比（a/t）和圆形裂纹半径）对混合模式断裂参数的影响。

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来源期刊

International Journal of Precision Engineering and Manufacturing 工程技术-工程：机械

CiteScore

4.10

自引率

10.50%

发文量

115

审稿时长

3-6 weeks

期刊介绍： The International Journal of Precision Engineering and Manufacturing accepts original contributions on all aspects of precision engineering and manufacturing. The journal specific focus areas include, but are not limited to: - Precision Machining Processes - Manufacturing Systems - Robotics and Automation - Machine Tools - Design and Materials - Biomechanical Engineering - Nano/Micro Technology - Rapid Prototyping and Manufacturing - Measurements and Control Surveys and reviews will also be planned in consultation with the Editorial Board.