Charpy V notch tests – Risks associated with testing with 3 samples

IF 1.3 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY Materiaux & Techniques Pub Date : 2021-01-01 DOI:10.1051/mattech/2021017
M. Huther, H. Lieurade
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Abstract

To estimate the risk of brittle fracture of a component in service, Charpy tests are generally carried out on 3 samples at the same temperature. Work done over many years on welded joint fatigue using probability and statistics has shown that to have a good assessment of minimum strength, it is clearly necessary to have a larger number of test results. In order to analyse the risks associated with this practice of 3 samples tested at the same temperature, a series of 17 Charpy impact test results of samples of the same steel plate was chosen. From this series, by translation, 2 series were generated, one with a test of 3 specimens showing acceptable steel and one with a test of 3 specimens showing unacceptable steel. The 3-test method was applied to these series leading to a possible simulation of 12 tests each. It was found that the 3-test practice leads to a risk of error of 30 to 40%. It is also found that the determination of the transition curve of a DH36 steel finally shows that its temperature for a CV of 27 J is of the order of −50 °C whereas the regulations require only −20 °C. In conclusion, a possible improvement of the test procedure is indicated, which is the subject of a study within the framework of the “CCRS rupture and fatigue” working groups of the Société des Ingénieurs Soudeurs (SIS).
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夏比V型缺口测试-与3个样本测试相关的风险
为了评估使用中部件脆性断裂的风险,通常在相同温度下对3个样品进行夏比试验。多年来利用概率和统计方法对焊接接头疲劳进行的研究表明,要对最小强度进行良好的评估,显然需要大量的试验结果。为了分析在相同温度下测试的3个样品的风险,选择了同一钢板样品的一系列17个Charpy冲击试验结果。从这个系列中,通过翻译,产生了2个系列,一个是3个样品的测试,显示可接受的钢,另一个是3个样品的测试,显示不可接受的钢。3测试方法应用于这些系列,导致每个系列可能模拟12个测试。结果发现,3次测试的做法会导致30 - 40%的错误风险。对DH36钢的转变曲线的测定表明,当CV为27j时,其温度约为- 50℃,而规范要求的温度仅为- 20℃。最后,指出了可能改进试验程序的方法,这是在ingingennieurs Soudeurs社会组织(SIS)的“CCRS断裂和疲劳”工作组框架内进行的一项研究的主题。
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
Materiaux & Techniques
Materiaux & Techniques MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
1.50
自引率
11.10%
发文量
20
期刊介绍: Matériaux & Techniques informs you, through high-quality and peer-reviewed research papers on research and progress in the domain of materials: physical-chemical characterization, implementation, resistance of materials in their environment (properties of use, modelling)... The journal concerns all materials, metals and alloys, nanotechnology, plastics, elastomers, composite materials, glass or ceramics. This journal for materials scientists, chemists, physicists, ceramicists, engineers, metallurgists and students provides 6 issues per year plus a special issue. Each issue, in addition to scientific articles on specialized topics, also contains selected technical news (conference announcements, new products etc.).
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