Uncertainty quantification for conical hole expansion test of DP800 sheet metal

IF 2.6 3区材料科学 Q2 ENGINEERING, MANUFACTURING

International Journal of Material Forming Pub Date : 2024-12-06 DOI:10.1007/s12289-024-01869-1

Quoc Tuan Pham, Alexander Barlo, Md Shafiqul Islam, Mats Sigvant, Johan Pilthammar, Lluís Pérez Caro, Vili Kesti

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Abstract

The hole expansion ratio (HER) observed in a standardized hole expansion test (HET) is commonly used to determine the edge fracture of steel sheets. A large variation of the measured HER restricts the practical application of the method. This study presents a systematic investigation on uncertainties in the HER of DP800 sheet material, including the hole-edge quality, pre-strain due to the hole-punching process, the friction coefficient, and the determination of fracture. An artificial neural network was trained to develop a surrogate model using a database gained from a thousand finite element simulations of the HET. Monte-Carlo simulations were performed using the trained surrogate model to characterize the distribution of the HER. Sensitivity analysis via Sobol’s indices is calculated to determine the influence of the input variables on the output. It is found that the pre-strain and pre-damage generated during the hole punching process in the shear-affected zone dominate the variation of the HER. Discussions on reducing the output’s variation are detailed. In general, these findings provide valuable insights for the determination of HER as well as the edge crack behavior of the investigated DP800 steel sheet.

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DP800板材锥形孔膨胀试验的不确定度定量

标准孔扩展试验（HET）中观察到的孔扩展比（HER）是确定钢板边缘断裂的常用方法。测量的HER变化较大，限制了该方法的实际应用。本文系统地研究了DP800薄板材料热应力的不确定因素，包括孔边质量、冲孔过程产生的预应变、摩擦系数和断口的确定。一个人工神经网络被训练来开发一个代理模型，使用从一千次HET有限元模拟中获得的数据库。蒙特卡罗模拟使用训练代理模型来表征HER的分布。通过Sobol指数计算敏感性分析，以确定输入变量对输出的影响。研究发现，剪切影响区冲孔过程中产生的预应变和预损伤主导了剪切影响区剪切强度的变化。详细讨论了减小输出变化的方法。总的来说，这些发现为确定所研究的DP800钢板的HER以及边缘裂纹行为提供了有价值的见解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Material Forming ENGINEERING, MANUFACTURING-MATERIALS SCIENCE, MULTIDISCIPLINARY

CiteScore

5.10

自引率

4.20%

发文量

审稿时长

>12 weeks

期刊介绍： The Journal publishes and disseminates original research in the field of material forming. The research should constitute major achievements in the understanding, modeling or simulation of material forming processes. In this respect ‘forming’ implies a deliberate deformation of material. The journal establishes a platform of communication between engineers and scientists, covering all forming processes, including sheet forming, bulk forming, powder forming, forming in near-melt conditions (injection moulding, thixoforming, film blowing etc.), micro-forming, hydro-forming, thermo-forming, incremental forming etc. Other manufacturing technologies like machining and cutting can be included if the focus of the work is on plastic deformations. All materials (metals, ceramics, polymers, composites, glass, wood, fibre reinforced materials, materials in food processing, biomaterials, nano-materials, shape memory alloys etc.) and approaches (micro-macro modelling, thermo-mechanical modelling, numerical simulation including new and advanced numerical strategies, experimental analysis, inverse analysis, model identification, optimization, design and control of forming tools and machines, wear and friction, mechanical behavior and formability of materials etc.) are concerned.