ASTM C1469-22 PDF
Standard Test Method for Shear Strength of Joints of Advanced Ceramics at Ambient Temperature
Standard Test Method for Shear Strength of Joints of Advanced Ceramics at Ambient Temperature
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 8
- Дата публикации:
- 1 февраля 2022 г.
- Издание:
- C1469
- ICS:
- 81.060.30
SIGNIFICANCE AND USE 5.1 Advanced ceramics can be candidate materials for structural applications requiring high degrees of wear and corrosion resistance, often at elevated temperatures. 5.2 Joints are produced to enhance the performance and applicability of materials. While the joints between similar materials are generally made for manufacturing complex parts and repairing components, those involving dissimilar materials usually are produced to exploit the unique properties of each constituent in the new component. Depending on the joining process, the joint region may be the weakest part of the component. Since under mixed-mode and shear loading the load transfer across the joint requires reasonable shear strength, it is important that the quality and integrity of joint under in-plane shear forces be quantified. Shear strength data are also needed to monitor the development of new and improved joining techniques. 5.3 Shear tests provide information on the strength and deformation of materials under shear stresses. 5.4 This test method may be used for material development, material comparison, quality assurance, characterization, and design data generation. 5.5 For quality control purposes, results derived from standardized shear test specimens may be considered indicative of the response of the material from which they were taken for given primary processing conditions and post-processing heat treatments. SCOPE 1.1 This test method covers the determination of shear strength of joints in advanced ceramics at ambient temperature using asymmetrical four-point flexure. Test specimen geometries, test specimen fabrication methods, testing modes (that is, force or displacement control), testing rates (that is, force or displacement rate), data collection, and reporting procedures are addressed. 1.2 This test method is used to measure shear strength of ceramic joints in test specimens extracted from larger joined pieces by machining. Test specimens fabricated in this way are not expected to warp due to the relaxation of residual stresses but are expected to be much straighter and more uniform dimensionally than butt-jointed test specimens prepared by joining two halves, which is not recommended. In addition, this test method is intended for joints, which have either low or intermediate strengths with respect to the substrate material to be joined. Joints with high strengths should not be tested by this test method because of the high probability of invalid tests resulting from fractures initiating at the reaction points rather than in the joint. Determination of the shear strength of joints using this test method is appropriate particularly for advanced ceramic matrix composite materials but also may be useful for monolithic advanced ceramic materials. 1.3 Values expressed in this test method are in accordance with the International System of Units (SI) and IEEE/ASTM SI 10. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Specific precautionary statements are noted in 8.1. 1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Abstract
Overview
ASTM C1469-22 is a standardized test method developed by ASTM International for the determination of shear strength in joints of advanced ceramics at ambient (room) temperature. This standard is essential for evaluating the mechanical integrity of ceramic joints, particularly where materials must demonstrate high wear and corrosion resistance. The document specifies procedures using asymmetrical four-point flexure, detailing specimen preparation, testing apparatus, and the calculation and reporting of results. Accurate shear strength data are crucial for structural and engineering applications, especially in the context of quality assurance, material comparison, joining techniques, and the development of advanced ceramic components.
Key Topics
- Shear Strength of Advanced Ceramics: Focuses on joints, often the weakest region in a component, especially under in-plane shear forces. Shear testing helps to quantify joint integrity.
- Test Specimen Preparation: Emphasizes extracting specimens from larger joined components by machining, resulting in straighter, uniform samples. Butt-joined test specimens are not recommended due to inconsistent results.
- Testing Procedure:
- Uses asymmetrical four-point flexure to apply and measure shear forces.
- Specifies geometry and alignment requirements for test specimens, with particular attention to notch placement and dimensions.
- Details environmental controls, including humidity and temperature monitoring during testing.
- Data Collection and Reporting: Outlines required data acquisition, including autographic force and displacement records, dimensional measurements, and statistical evaluation (mean, standard deviation, coefficient of variation).
- Quality Assurance and Comparative Data: Results from standardized tests can provide benchmarking for material properties, support the development of new joining techniques, and deliver valuable quality control data for manufacturers and researchers.
Applications
ASTM C1469-22 is widely used across industries engaged in the development and use of advanced ceramics. Key applications include:
- Material Development and Research: Ideal for generating design data and characterizing new ceramic matrix composites or monolithic ceramics for structural use.
- Manufacturing and Process Optimization: Assists in optimizing joining processes for similar and dissimilar materials, enabling the creation of complex parts or repair of components subjected to mechanical and environmental stressors.
- Quality Control and Assurance: Provides a reliable method for verifying the consistency and integrity of ceramic joints processed under specified manufacturing conditions or after post-processing treatments.
- Comparative Testing: Facilitates comparison between different materials and joining methods, supporting both product improvement and competitiveness in the advanced ceramics market.
Related Standards
ASTM C1469-22 should be considered alongside several related ASTM standards and terminology resources to achieve comprehensive material testing and evaluation:
- ASTM C1145: Terminology of Advanced Ceramics
- ASTM C1161: Test Method for Flexural Strength of Advanced Ceramics at Ambient Temperature
- ASTM C1211: Test Method for Flexural Strength of Advanced Ceramics at Elevated Temperatures
- ASTM C1275: Test Method for Monotonic Tensile Behavior of Continuous Fiber-Reinforced Advanced Ceramics at Ambient Temperature
- ASTM C1341: Test Method for Flexural Properties of Continuous Fiber-Reinforced Advanced Ceramic Composites
- ASTM D3878: Terminology for Composite Materials
- ASTM D5379/D5379M: Test Method for Shear Properties of Composite Materials by the V-Notched Beam Method
- ASTM E4: Practices for Force Calibration and Verification of Testing Machines
- ASTM E122: Practice for Calculating Sample Size to Estimate Characteristics with Specified Precision
- IEEE/ASTM SI 10: American National Standard for Use of the International System of Units (SI)
Adhering to these standards ensures accurate, repeatable, and internationally recognized test results, providing confidence in the performance of advanced ceramic joints under shear loading at room temperature.
Технические детали
- Технический комитет
- C28 - Advanced Ceramics
- SKU
- ASTM C1469-22
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