评估复合材料高速 DCB 测试的测量不确定性

IF 1.9 4区 工程技术 Q3 MECHANICS
Thomas Fourest, Gérald Portemont
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引用次数: 0

摘要

本研究调查了双悬臂梁(DCB)试验中的动态行为,加载速率从 6 毫米/分钟到 3 米/秒不等。使用综合仪器研究了测量误差(载荷、开口和裂缝长度)或偏差(不对称)的来源,并利用校正梁理论的三种变体量化了它们对断裂韧性测定的影响。特别是,通过对初始测试阶段的监测,发现了在建立零载荷和位移基准方面存在的挑战。由此产生的断裂韧性不确定性估计在 7-15% 之间。使用数字图像相关技术记录了较高加载速率(1 m/s 和 3 m/s)下的臂不对称情况。利用这些数据和一个简单的梁模型,计算出的模式混合度(威廉姆斯方法中的 GII/GI)约为 10%-20%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Assessing measurement uncertainties on high-speed DCB testing of composites

This study investigates dynamic behavior in Double Cantilever Beam (DCB) tests across loading rates from 6 mm/min to 3 m/s. Comprehensive instrumentation has been used to investigate the sources of measurement errors (load, opening and crack length) or biases (asymmetry) and to quantify their effects on the fracture toughness determination using three variations of the Corrected Beam Theory. In particular, challenges in establishing zero load and displacement references were revealed through monitoring initial test phases. The resulting uncertainties in the fracture toughness have been estimated to be between 7 and 15%. Arms asymmetry during higher loading rates (1 m/s and 3 m/s) has been recorded using Digital Images Correlation. Using this data and a simple beam model, mode mixity (GII/GI from Williams approach) computed is in the order of 10%–20%.

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来源期刊
CiteScore
4.10
自引率
4.20%
发文量
114
审稿时长
9 months
期刊介绍: Mechanics Research Communications publishes, as rapidly as possible, peer-reviewed manuscripts of high standards but restricted length. It aims to provide: • a fast means of communication • an exchange of ideas among workers in mechanics • an effective method of bringing new results quickly to the public • an informal vehicle for the discussion • of ideas that may still be in the formative stages The field of Mechanics will be understood to encompass the behavior of continua, fluids, solids, particles and their mixtures. Submissions must contain a strong, novel contribution to the field of mechanics, and ideally should be focused on current issues in the field involving theoretical, experimental and/or applied research, preferably within the broad expertise encompassed by the Board of Associate Editors. Deviations from these areas should be discussed in advance with the Editor-in-Chief.
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