ASTM D7750-23 PDF
Standard Test Method for Cure Behavior of Thermosetting Resins by Dynamic Mechanical Procedures using an Encapsulated Specimen Rheometer
Standard Test Method for Cure Behavior of Thermosetting Resins by Dynamic Mechanical Procedures using an Encapsulated Specimen Rheometer
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 8
- Дата публикации:
- 1 апреля 2023 г.
- Издание:
- D7750
- ICS:
- 83.080.10
SIGNIFICANCE AND USE 5.1 This method provides a simple means of characterizing the cure behavior of a thermosetting resin specimen that is a representation of a composite part. The diameter of the specimen is approximately 38 mm and the thickness ranges from 2.6 mm to 3.2 mm. This corresponds to a sample volume of approximately 3 cm3 to 4 cm3. The data may be used for quality control, research and development, and verifying the cure within processing equipment including autoclaves. 5.2 Dynamic mechanical testing provides a sensitive method for determining cure characteristics by measuring the elastic and loss moduli as a function of temperature or time, or both. Plots of cure behavior and tan delta of a material provide graphical representation indicative of cure behavior under a specified time-temperature profile. The presence of fibers within the resin may change the dynamic properties measured within a material. However, it is still possible to compare different resins with the same fiber structure and obtain the relative difference due to the resin cure properties. 5.3 This method can be used to assess the following: 5.3.1 Cure behavior, as well as changes as a function of temperature or time, or both, 5.3.2 Processing behavior, as well as changes as a function of temperature or time, or both, 5.3.3 The effects of processing treatments, 5.3.4 Relative resin behavioral properties, including cure behavior, damping and impact resistance, 5.3.5 The effects of reinforcement on cure; the reinforcement can be a fiber or a filler, 5.3.6 The effects of materials used to bond the resin and reinforcement, 5.3.7 The effect of formulation additives that might affect processability or performance. 5.4 This provides a method to assess the cure properties of a thermosetting resin containing woven fiber or other reinforcing materials. 5.5 This method is valid for a wide range of oscillation frequencies typically from 0.002 Hz to 50 Hz. Note 1: It is recommended tha... SCOPE 1.1 This method covers the use of dynamic mechanical instrumentation for determination and reporting of the thermal advancement of cure behavior of thermosetting resin on an inert filler or fiber in a laboratory. It may also be used for determining the cure properties of resins without fillers or fibers. These encapsulated specimens are deformed in torsional shear using dynamic mechanical methods. 1.2 This method is intended to provide means for determining the cure behavior of thermosetting resins on fibers over a range of temperatures from room temperature to 250 °C by forced-constant amplitude techniques (in accordance with Practice D4065). Plots of complex modulus, complex viscosity, and damping ratio or tan delta as a function of time or temperature, or both, quantify the thermal advancement or cure characteristics of a resin or a resin on filler or fiber. 1.3 Test data obtained by this method is relevant and appropriate for optimizing cure cycles. 1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.4.1 Exception—The Fahrenheit temperature measurement in 10.1 is provided for information only and is not considered standard. 1.5 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. 1.6 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 D7750-23, “Standard Test Method for Cure Behavior of Thermosetting Resins by Dynamic Mechanical Procedures using an Encapsulated Specimen Rheometer,” provides a reliable laboratory method for characterizing the cure behavior of thermosetting resins. Using a dynamic mechanical analyzer (DMA) or encapsulated specimen rheometer, this test measures the thermal advancement of cure in resins - both with and without reinforcements such as fibers or fillers. This approach can be applied across a temperature range from room temperature up to 250°C, making it suitable for a variety of resin systems commonly used in composite manufacturing.
Dynamic mechanical analysis enables detailed evaluation of properties such as viscoelastic moduli and complex viscosity, producing data essential for quality control, research and development, process verification, and optimization within industrial settings, including autoclaves.
Key Topics
- Cure Behavior Assessment: The method provides precise determination of cure states, including the gel point and glass transition temperature (Tg), by analyzing how the elastic (storage) modulus and viscous (loss) modulus evolve with time and temperature.
- Processing Behavior Analysis: Enables monitoring of processing conditions and response to manufacturing treatments, supporting process optimization and troubleshooting.
- Reinforcement Effects: Evaluates the influence of various reinforcement types (fibers, fillers) and bonding agents on the cure kinetics and dynamic mechanical properties.
- Additives Evaluation: Assesses how additives or formulation changes impact processability and final performance.
- Frequency Range: Applicable for oscillation frequencies from 0.002 Hz to 50 Hz, offering flexibility for different material behaviors and testing protocols.
- Data Interpretation: Plots such as modulus, tan delta, and viscosity versus time or temperature provide a graphical representation of the curing process.
Applications
ASTM D7750-23 is widely used across industries specializing in polymer composites and thermosetting resins, including aerospace, automotive, wind energy, sporting goods, and construction. Practical applications include:
- Quality Control: Manufacturers use this standard to ensure incoming resin batches and final products consistently meet required curing specifications.
- Process Optimization: The method supports the development and refinement of cure cycles, maximizing performance and minimizing defects in composite parts.
- Material Development: R&D teams rely on the data to compare cure profiles among resin formulations, including the effects of new additives or reinforcements.
- Troubleshooting Production Issues: Inconsistent cure can lead to component failures. This test method helps identify and resolve such issues by simulating the thermal and mechanical conditions of processing.
- Verification of Composite Manufacturing: By mimicking autoclave or other processing environments, it validates that cure reactions are uniform across complex part geometries.
Related Standards
ASTM D7750-23 references a suite of related standards for composite materials and dynamic mechanical analysis:
- ASTM D4065 - Practice for Plastics: Dynamic Mechanical Properties: Determination and Report of Procedures
- ASTM D4473 - Test Method for Plastics: Dynamic Mechanical Properties: Cure Behavior
- ASTM D7028 - Test Method for Glass Transition Temperature (DMA Tg) of Polymer Matrix Composites by DMA
- ASTM D3878 - Terminology for Composite Materials
- ASTM D4092 - Terminology for Plastics: Dynamic Mechanical Properties
- ASTM D4000 - Classification System for Specifying Plastic Materials
- ASTM D6507 - Practice for Fiber Reinforcement Orientation Codes for Composite Materials
Adopting these referenced standards alongside ASTM D7750-23 ensures comprehensive, reliable testing and reporting of thermoset resin cure behavior for industrial and research applications.
Keywords: ASTM D7750-23, thermosetting resin cure, dynamic mechanical analysis, encapsulated specimen rheometer, composites quality control, cure behavior, gel point, glass transition temperature, viscoelastic properties, process optimization.
Технические детали
- Технический комитет
- D30 - Composite Materials
- SKU
- ASTM D7750-23
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