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ASTM E1875-2008 利用回声共振测试动态杨氏模量、剪切模数和泊松比的标准试验方法

ASTM E1875-2008 利用回声共振测试动态杨氏模量、剪切模数和泊松比的标准试验方法

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【英文标准名称】: Standard Test Method for Dynamic Young''s Modulus, Shear Modulus, and Poisson''s Ratio by Sonic Resonance
【原文标准名称】: 利用回声共振测试动态杨氏模量、剪切模数和泊松比的标准试验方法
【标准号】: ASTM E1875-2008
【标准状态】: 现行
【国别】: 美国
【发布日期】: 2008
【实施或试行日期】:
【发布单位】: 美国材料与试验协会(US-ASTM)
【起草单位】: E28.04
【标准类型】: (Test Method)
【标准水平】: ()
【中文主题词】:
【英文主题词】: dynamic; elastic modulus; elastic properties; Poisson's ratio; resonance; resonant beam; shear modulus; Young's modulus; Dynamic Young's modulus; Modulus of elasticity; Poisson's ratio; Shear modulus; Sonic resonance; Young's modulus
【摘要】: This test method has advantages in certain respects over the use of static loading systems for measuring moduli. This test method is nondestructive in nature. Only minute stresses are applied to the specimen, thus minimizing the possibility of fracture. The period of time during which measurement stress is applied and removed is of the order of hundreds of microseconds. With this test method it is feasible to perform measurements at high temperatures, where delayed elastic and creep effects would invalidate modulus measurements calculated from static loading. This test method is suitable for detecting whether a material meets specifications, if cognizance is given to one important fact in materials are often sensitive to thermal history. Therefore, the thermal history of a test specimen must be considered in comparing experimental values of moduli to reference or standard values. Specimen descriptions should include any specific thermal treatments that the specimens have received.1.1 This test method covers the determination of the dynamic elastic properties of elastic materials. Specimens of these materials possess specific mechanical resonant frequencies that are determined by the elastic modulus, mass, and geometry of the test specimen. Therefore, the dynamic elastic properties of a material can be computed if the geometry, mass, and mechanical resonant frequencies of a suitable test specimen of that material can be measured. Dynamic Young''s modulus is determined using the resonant frequency in the flexural mode of vibration. The dynamic shear modulus, or modulus of rigidity, is found using torsional resonant vibrations. Dynamic Young''s modulus and dynamic shear modulus are used to compute Poisson''s ratio. 1.2 This test method is specifically appropriate for materials that are elastic, homogeneous, and isotropic (1). Materials of a composite character (particulate, whisker, or fiber reinforced) may be tested by this test method with the understanding that the character (volume fraction, size, morphology, distribution, orientation, elastic properties, and interfacial bonding) of the reinforcement in the test specimen will have a direct effect on the elastic properties. These reinforcement effects must be considered in interpreting the test results for composites. This test method is not satisfactory for specimens that have cracks or voids that are major discontinuities in the specimen. Neither is the test method satisfactory when these materials cannot be fabricated in a uniform rectangular or circular cross section. 1.3 A high-temperature furnace and cryogenic cabinet are described for measuring the dynamic elastic moduli as a function of temperature from x2013;195 to 1200x00B0;C. 1.4 Modification of this test method for use in quality control is possible. A range of acceptable resonant frequencies is determined for a specimen with a particular geometry and mass. Any specimen with a frequency response falling outside this frequency range is rejected. The actual modulus of each specimen need not be determined as long as the limits of the selected frequency range are known to include the resonant frequency that the specimen must possess if its geometry and mass are within specified tolerances. 1.5 There are material specific ASTM standards that cover the determination of resonance frequencies and elastic properties of specific materials by sonic resonance or by impulse excitation of vibration. Test Methods C 215, C 623, C 747, C 848, C 1198, and C 1259 may differ from this test method in several areas (for example; sample size, d......
【中国标准分类号】: H23
【国际标准分类号】: 81_060_20
【页数】: 9P.;A4
【正文语种】: 英语

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