关于在ASTM E23中为Charpy机器的间接验证增加可重复性要求的可能性
1Applied Chemicals and Materials Division, National Institute of Standards and Technology, 325 Broadway St., Boulder, CO 80305, USA.
Materials performance and characterization
|April 11, 2025
概括
美国国家标准与技术研究所 (NIST) 发现,用于Charpy机器的ASTM E23标准缺乏可重复性标准. 建议修订ASTM E23以包括可重复性,以确保更可靠的冲击测试结果.
科学领域:
- 材料科学 材料科学 材料科学
- 机械工程 机械工程
- 计量学 计量学 计量学
背景情况:
- 自1989年以来,美国国家标准与技术研究所 (NIST) 在全球范围内验证了数千台Charpy机器.
- 现有的验证方法依赖于金属材料冲击测试的ASTM E23和ISO 148-2标准.
- 一个大量的验证结果数据库 (77,105条记录) 提供了对机器性能的见解.
研究的目的:
- 将ASTM E23的偏差标准与ISO 148-2的偏差和可重复性标准进行比较.
- 通过纳入可重复性要求,提出修订ASTM E23的建议.
- 为了提高Charpy机器验证的可靠性和一致性.
主要方法:
- 对Charpy机器间接验证结果的综合数据库的分析.
- 对ASTM E23偏差标准与ISO 148-2偏差和可重复性标准进行比较评估.
- 对在ASTM E23.3中引入重复性限制的四个不同的建议进行评估.
主要成果:
- 仅关注偏差的ASTM E23标准,允许不符合ISO 148-2重复性要求的机器通过.
- 自1990年以来,NIST验证的机器中约有六分之一符合ASTM E23偏差标准,但未能达到ISO 148-2的重复性.
- 提出了一套可重复性极限 (大于4J或15%的认证吸收能量).
结论:
- 目前的ASTM E23标准可能允许不可靠的Charpy机器,因为没有可重复性标准.
- 纳入拟议的可重复性限制只会稍微增加验证的严格性.
- 修改ASTM E23对于符合ISO 148-2和防止接受重复性差的机器至关重要.
关键词:
这是ASTM E23的标准.根据ISO 148-2标准,可以使用美国国家标准与技术研究所Charpy计划国家标准与技术研究所Charpy数据库偏见 偏见 偏见 偏见 偏见间接验证的间接验证方法可以重复的可重复性.更多相关视频
05:26Determination of the Mechanical Properties of Flexible Connectors for Use in Insulated Concrete Wall Panels
Published on: October 19, 2022
1.5K
07:37Full-field Strain Measurements for Microstructurally Small Fatigue Crack Propagation Using Digital Image Correlation Method
Published on: January 16, 2019
9.6K
相关概念视频
01:18Mechanical Characteristics of Steel
369
The mechanical characteristics of steel are assessed through various tests that evaluate its strength, toughness, and flexibility. These tests include tension, torsion, impact, bending, and hardness assessments, each providing crucial information about steel's suitability for specific applications.
The tension test is fundamental for determining tensile strength. In this test, a steel specimen is stretched using a gripping device until it breaks. The data collected during this test are used...
The tension test is fundamental for determining tensile strength. In this test, a steel specimen is stretched using a gripping device until it breaks. The data collected during this test are used...
369
01:12Non-destructive Tests for Concrete Strength
100
The rebound hammer test, also known as the Schmidt hammer test, is a non-destructive technique for evaluating the hardness of concrete and, indirectly, the strength of concrete. It operates on the principle that the rebound of a spring-driven mass from a concrete surface correlates to the surface's hardness. The device comprises a mass within a tubular housing, a spring mechanism, and a plunger that strikes the concrete. Upon release, the energy imparted to the mass by the spring causes it...
100
01:22Vebe Test
92
The Vebe test is a method used to measure the workability of concrete, particularly effective for dry concrete mixes. This test employs a specific apparatus that includes a cylindrical chamber, a standard slump cone, and a transparent disc-shaped rider, all mounted on a vibrating table. The cylindrical chamber has dimensions of nine and a half inches in diameter and eight inches in height.
To conduct the test, concrete is placed into the slump cone. The concrete is filled in layers and...
To conduct the test, concrete is placed into the slump cone. The concrete is filled in layers and...
92
01:22Toughness and Hardness of Aggregate
223
Toughness and hardness are critical properties of aggregate materials used in concrete, particularly on pavement surfaces and industrial flooring subjected to heavy loads. Toughness is defined as the aggregate's resistance to failure by impact and is measured by the aggregate impact value (AIV). For this, the aggregate impact value test is performed, wherein the impact is delivered by a standard hammer, which falls freely under its own weight onto the aggregates. The aggregates fragment in...
223
01:25Yield Criteria for Ductile Materials under Plane Stress
126
In designing structural elements and machine parts using ductile materials, it is crucial to ensure that these components withstand applied stresses without yielding. Yielding is initially determined through a tensile test, which evaluates the material's response to uniaxial stress. However, tensile stress is insufficient when components face biaxial or plane stress conditions This condition requires advanced criteria to predict failure.
The Maximum Shearing Stress Criterion, also known as...
The Maximum Shearing Stress Criterion, also known as...
126