基于全场数据驱动识别的材料应变速率相关性实验表征

IF 5.1 2区 工程技术 Q1 ENGINEERING, MECHANICAL International Journal of Impact Engineering Pub Date : 2024-08-22 DOI:10.1016/j.ijimpeng.2024.105083
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引用次数: 0

摘要

机械表征通常依赖于标准化的样品几何形状,其中规定了均匀的应变和应力状态。因此,需要进行多次测试才能捕捉材料在各种加载条件下的响应。使用复杂的几何形状可以在一次测试中探索更广泛的领域,但需要获得局部应变和应力,以便为模型提供数据。在这种情况下,数字图像相关和聚类技术可用于制定反问题,无需先验构成模型即可识别应力张量场。本研究探讨了这种数据驱动的应力识别方法的速率相关表述的性能,该方法可通过一次测试捕捉低碳钢合金的单调高应变速率相关响应。在介绍了问题的表述和解决框架后,我们使用了在缺口试样几何形状上进行的高速拉伸试验的数字孪生来探索识别性能。它允许根据多个指标(应力大小、多轴性)定义置信区间,并评估同时捕获的应变速率水平范围。该方法最终被应用于使用高空间分辨率超高速相机的实际实验。在样品的主要部分,在 10% 的置信度范围内确定了应力张量场,并检索了从 20 到 300 s-1 的材料速率依赖性,发现与文献非常吻合。这是 DDI 在高应变速率背景下的首次实验应用。所提出的框架不仅可以大大拓宽力学表征的样品设计空间,而且还可以在动态局部化过程中探测局部应力,而在这一过程中,原位定量数据仍然缺失。
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Experimental characterization of material strain-rate dependence based on full-field Data-Driven Identification

Mechanical characterization usually relies on standardized sample geometries where homogeneous state of strain and stress are prescribed. Hence, many tests are required to capture the material response over various loading conditions. Using complex geometry allows for exploring wider domain in a single test but would require to have access to local strains and stresses to feed models. In that context, digital image correlation and clustering technique can be used to formulate an inverse problem able to identify fields of stress tensors without a priori constitutive modelling. This study explores the performances of a rate-dependent formulation of such a data-driven stress identification method, for capturing using a single test, the monotonic high strain-rate dependent response of a mild steel alloy. After presenting the problem formulation and resolution framework, a digital twin of a high speed tensile test performed on a notched sample geometry is used to explore identification performances. It allows defining confidence intervals depending on multiple indicators (stress magnitude, multiaxiality) and evaluate the range of strain-rate levels simultaneously captured. The method is eventually applied to a real experiment instrumented with high spatial resolution ultra high speed camera. Stress tensor fields are identified, within a 10 % confidence over the major part of the sample, and its material rate-dependence is retrieved from 20 to 300 s−1 and found in very good agreement with literature. This is the first experimental application of the DDI in a high strain-rate context. The proposed framework may substantially widen the sample design space for mechanical characterization but also allow for probing local stresses during dynamic localization processes where in-situ quantitative data are still missing.

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来源期刊
International Journal of Impact Engineering
International Journal of Impact Engineering 工程技术-工程:机械
CiteScore
8.70
自引率
13.70%
发文量
241
审稿时长
52 days
期刊介绍: The International Journal of Impact Engineering, established in 1983 publishes original research findings related to the response of structures, components and materials subjected to impact, blast and high-rate loading. Areas relevant to the journal encompass the following general topics and those associated with them: -Behaviour and failure of structures and materials under impact and blast loading -Systems for protection and absorption of impact and blast loading -Terminal ballistics -Dynamic behaviour and failure of materials including plasticity and fracture -Stress waves -Structural crashworthiness -High-rate mechanical and forming processes -Impact, blast and high-rate loading/measurement techniques and their applications
期刊最新文献
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