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Standard Test Method for Cure Behavior of Thermosetting Resins by Dynamic Mechanical Procedures using an Encapsulated Specimen Rheometer 用封装样品流变仪通过动态机械程序测定热固性树脂固化性能的标准试验方法
发布日期: 2023-04-01
1.1 该方法包括在实验室中使用动态机械仪器来测定和报告热固性树脂在惰性填料或纤维上的固化行为的热进展。它也可用于测定不含填料或纤维的树脂的固化性能。这些封装试样在扭转剪切中使用动态力学方法变形。 1.2 该方法旨在提供用于确定热固性树脂在从室温到250的温度范围内对纤维的固化行为的方法 通过强制恒定振幅技术(根据实践 D4065 ). 复模量、复粘度和阻尼比或tanδ作为时间或温度的函数,或两者兼有的曲线图,量化了树脂或树脂在填料或纤维上的热推进或固化特性。 1.3 通过该方法获得的测试数据对于优化固化循环是相关的和适当的。 1.4 以国际单位制表示的数值应视为标准。本标准不包括其他计量单位。 1.4.1 例外情况- 华氏温度测量单位 10.1 仅供参考,不被视为标准。 1.5 本标准并非旨在解决与其使用相关的所有安全问题(如有)。 本标准的使用者有责任在使用前制定适当的安全、健康和环境实践,并确定监管限制的适用性。 1.6 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ====意义和用途====== 5.1 该方法提供了一种表征热固性树脂试样固化行为的简单方法,热固性树脂试样是复合材料零件的代表。 样本的直径约为38 mm,厚度范围为2.6 毫米至3.2毫米 mm。这对应于大约3的样本体积 厘米 3. 至4 厘米 3. 这些数据可用于质量控制、研发和验证包括高压灭菌器在内的加工设备内的固化。 5.2 动态机械测试提供了一种灵敏的方法,通过测量作为温度或时间函数的弹性模量和损耗模量,或同时测量两者,来确定固化特性。材料的固化行为和tanδ图提供了指示在指定时间下固化行为的图形表示- 温度分布。树脂中纤维的存在可能会改变材料内测量的动态性能。然而,仍然可以比较具有相同纤维结构的不同树脂,并由于树脂固化性能而获得相对差异。 5.3 此方法可用于评估以下内容: 5.3.1 固化行为,以及作为温度或时间或两者的函数的变化, 5.3.2 处理行为以及作为温度或时间或两者的函数的变化, 5.3.3 加工处理的效果, 5.3.4 树脂的相对性能,包括固化性能、阻尼和抗冲击性能, 5.3.5 钢筋对固化的影响;加强件可以是纤维或填料, 5.3.6 用于粘合树脂和加强件的材料的效果, 5.3.7 配方添加剂可能影响加工性或性能的影响。 5.4 这提供了一种评估含有编织纤维或其他增强材料的热固性树脂的固化性能的方法。 5.5 这种方法适用于通常从0.002到0.002的大范围振荡频率 赫兹至50 赫兹。 注1: 建议低频测试条件,一般为1 赫兹至2 Hz,用于产生更明确的固化- 行为信息。较低的频率将错过重要的固化特性。更快的频率将降低治愈的敏感性。
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. ====== 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 cm 3 to 4 cm 3 . 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 that low-frequency test conditions, generally 1 Hz to 2 Hz, be used to generate more definitive cure-behavior information. Slower frequencies will miss important cure properties. Faster frequencies will reduce sensitivity to cure.
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归口单位: D30.03
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