The effect of groove and notch tip angles on testing fracture toughness by SEVNB method: models and experimental validation

IF 2.2 4区 材料科学 Q2 MATERIALS SCIENCE, CERAMICS Journal of Asian Ceramic Societies Pub Date : 2023-01-02 DOI:10.1080/21870764.2022.2156676
J. Cui, Kang Guan, Pinggen Rao, Cheng Peng, Q. Zeng, Jiantao Liu, Shuyan Yu
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Abstract

ABSTRACT The single-edged V-notch beam (SEVNB) method is considered as an effective method for evaluating the fracture toughness values of brittle materials. In this method, it is assumed that the V-notch is a natural crack. However, this assumption may cause an overestimation of the fracture toughness due to the “notch passivation effect”. To investigate the effects of the V-notch and groove tip angles on the fracture toughness testing of ceramic materials, three typical models were established in this work. The stress intensity factors of these models were calculated using a J-integral based on the linear finite element method (LFEM). The results indicated that the measured fracture toughness values could be overestimated by 0.5%- 13.7% when the angle of the V-notch tip increased from 10° to 60°. Increasing the angle formed by the V-notch and groove from 10° to 60°, fracture toughness was overevaluated by about 0% – 2.0%. When the angle formed by the V-notch and groove increased to 120°, the fracture toughness was overevaluated by about 31%. Finally, two equations were fitted to assess the angles effects on fracture toughness, and the results have been validated by experiments. An important reference for the SEVNB method can be found in this work.
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凹槽和缺口尖端角度对SEVNB法测试断裂韧性的影响:模型和实验验证
单刃v形缺口梁(SEVNB)法被认为是评估脆性材料断裂韧性值的一种有效方法。在此方法中,假设v型缺口为自然裂纹。然而,由于“缺口钝化效应”,这种假设可能会导致对断裂韧性的高估。为了研究v形缺口和凹槽尖端角度对陶瓷材料断裂韧性测试的影响,本文建立了三个典型模型。采用基于线性有限元法(LFEM)的j积分法计算了各模型的应力强度因子。结果表明,当v形缺口尖端角度从10°增加到60°时,测量的断裂韧性值会高估0.5% ~ 13.7%。当v形缺口与沟槽形成的角度从10°增加到60°时,断裂韧性高估约0% ~ 2.0%。当v形缺口与坡口形成的角度增加到120°时,断裂韧性被高估约31%。最后,拟合了两个方程来评估角度对断裂韧性的影响,并通过实验验证了结果。这项工作为SEVNB方法提供了重要的参考。
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来源期刊
Journal of Asian Ceramic Societies
Journal of Asian Ceramic Societies Materials Science-Ceramics and Composites
CiteScore
5.00
自引率
4.30%
发文量
78
审稿时长
10 weeks
期刊介绍: The Journal of Asian Ceramic Societies is an open access journal publishing papers documenting original research and reviews covering all aspects of science and technology of Ceramics, Glasses, Composites, and related materials. These papers include experimental and theoretical aspects emphasizing basic science, processing, microstructure, characteristics, and functionality of ceramic materials. The journal publishes high quality full papers, letters for rapid publication, and in-depth review articles. All papers are subjected to a fair peer-review process.
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