ASTM C1323-22 PDF
Standard Test Method for Ultimate Strength of Advanced Ceramics with Diametrally Compressed C-Ring Specimens at Ambient Temperature
Standard Test Method for Ultimate Strength of Advanced Ceramics with Diametrally Compressed C-Ring Specimens at Ambient Temperature
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 8
- Дата публикации:
- 15 марта 2022 г.
- Издание:
- C1323
- ICS:
- 81.060.30
SIGNIFICANCE AND USE 4.1 This test method may be used for material development, material comparison, quality assurance, and characterization. Extreme care should be exercised when generating design data. 4.2 For a C-ring under diametral compression, the maximum tensile stress occurs at the outer surface. Hence, the C-ring specimen loaded in compression will predominately evaluate the strength distribution and flaw population(s) on the external surface of a tubular component in the hoop direction. Accordingly, the condition of the inner surface may be of lesser consequence in specimen preparation and testing. Note 1: A C-ring in tension or an O-ring in compression may be used to evaluate the internal surface. 4.2.1 The flexure stress is computed based on simple curved beam theory (1-5).3 It is assumed that the material is isotropic and homogeneous, the moduli of elasticity are identical in compression or tension, and the material is linearly elastic. These homogeneity and isotropy assumptions preclude the use of this standard for continuous fiber reinforced composites. Average grain size(s) should be no greater than one fiftieth (1/50 ) of the C-ring thickness. The curved beam stress solution from engineering mechanics is in good agreement (within 2 %) with an elasticity solution as discussed in (6) for the test specimen geometries recommended for this standard. The curved beam stress equations are simple and straightforward, and therefore it is relatively easy to integrate the equations for calculations for effective area or effective volume for Weibull analyses as discussed in Appendix X1. 4.2.2 The simple curved beam and theory of elasticity stress solutions both are two-dimensional plane stress solutions. They do not account for stresses in the axial (parallel to b) direction, or variations in the circumferential (hoop, σθ) stresses through the width (b) of the test piece. The variations in the circumferential stresses increase with increases in width (b) and ring thicknes... SCOPE 1.1 This test method covers the determination of ultimate strength under monotonic loading of advanced ceramics in tubular form at ambient temperatures. The ultimate strength as used in this test method refers to the strength obtained under monotonic compressive loading of C-ring specimens such as shown in Fig. 1, where monotonic refers to a continuous nonstop test rate with no reversals from test initiation to final fracture. This method permits a range of sizes and shapes since test specimens may be prepared from a variety of tubular structures. The method may be used with microminiature test specimens. FIG. 1 C-Ring Test Geometry with Defining Geometry and Reference Angle (θ) for the Point of Fracture Initiation on the Circumference 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.2.1 Values expressed in this test method are in accordance with the International System of Units (SI) and IEEE/ASTM SI 10. 1.3 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. 1.4 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 C1323-22, titled "Standard Test Method for Ultimate Strength of Advanced Ceramics with Diametrally Compressed C-Ring Specimens at Ambient Temperature," is a critical testing standard developed by ASTM International for determining the ultimate strength of advanced ceramics in tubular form. This standard outlines a monotonic loading method using C-ring specimens, focusing on measuring the material’s performance under compressive stress at ambient temperatures. The method is suitable for a variety of sizes and shapes, including microminiature specimens, making it versatile for both research and industrial applications.
Key Topics
-
Purpose and Scope
- Evaluates the ultimate strength of advanced ceramics, specifically in tubular or ring forms, under monotonic diametral compression at room temperature.
- Focuses on the strength distribution and flaw populations at the external (outer) surface in the hoop (circumferential) direction.
-
Material and Specimen Requirements
- Applicable to monolithic, isotropic, and homogeneous ceramic materials; not recommended for fiber-reinforced composites.
- Specimens should closely represent the final component's size and surface condition to minimize scaling effects.
- Defined geometric requirements for ring thickness and width to ensure valid stress distribution.
-
Testing Procedure
- Use of appropriate loading machines with precise alignment and data recording capabilities.
- Careful mounting and loading of specimens to prevent undesired fracture origins due to edge or surface flaws.
- Monitoring test environment parameters such as humidity and temperature, as environmental factors can affect ceramic strength.
- Guidelines for specimen preparation, emphasizing surface finish and edge treatment to avoid artificially weakening the material.
-
Data Reporting and Analysis
- Calculation of maximum tensile (hoop) stress using curved beam theory.
- Use of Weibull statistics for strength distribution analysis, reflecting the brittle nature and flaw-driven failure in ceramics.
- Emphasis on statistical evaluation due to inherent variability in ceramic material strength.
Applications
-
Material Development and Characterization
- Essential for comparing material strength, optimizing new ceramic compositions, and validating manufacturing improvements.
-
Quality Assurance
- Provides consistent, reproducible methods for manufacturers to monitor batch-to-batch consistency in advanced ceramics.
-
Component Design and Reliability Assessment
- Supports the generation of data for statistical strength distributions, which are critical in reliability engineering and safe design of ceramic components used in demanding applications such as electronics, energy, automotive, and aerospace.
-
Evaluation of Surface Conditions
- Valuable for assessing how manufacturing processes, surface treatments, or environmental exposure affect the external surface integrity and ultimate strength of tubular ceramics.
Related Standards
For comprehensive ceramic testing and analysis, ASTM C1323-22 should be considered alongside several key ASTM standards:
- ASTM C1161: Test Method for Flexural Strength of Advanced Ceramics at Ambient Temperature
- ASTM C1145: Terminology of Advanced Ceramics
- ASTM C1239: Practice for Reporting Uniaxial Strength Data and Estimating Weibull Distribution Parameters for Advanced Ceramics
- ASTM C1322: Practice for Fractography and Characterization of Fracture Origins in Advanced Ceramics
- ASTM C1368: Test Method for Determination of Slow Crack Growth Parameters of Advanced Ceramics by Constant Stress Rate Strength Testing at Ambient Temperature
- ASTM C1683: Practice for Size Scaling of Tensile Strengths Using Weibull Statistics for Advanced Ceramics
- ASTM E4 & E6: Practices for Force Calibration and Terminology Relating to Mechanical Testing
- ASTM E337: Test Method for Measuring Humidity with a Psychrometer
By following ASTM C1323-22, professionals ensure reliable testing of advanced ceramics, promoting uniformity in material development, quality assurance, and component safety assessments within the global ceramics industry.
Технические детали
- Технический комитет
- C28 - Advanced Ceramics
- SKU
- ASTM C1323-22
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