The construction of a prototype apparatus for measurement of elastic constants with small specimen

小试样弹性常数测量原型装置的构建

• 批准号: 03555156
• 负责人: KOIWA Masahiro
• 金额: $ 4.8万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research (B)
• 财政年份: 1991
• 资助国家: 日本
• 起止时间: 1991 至 1992
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03555156/
• 关键词: Elastic constants; RPR-method; Small specimen; Cubic crystal; Intermetallic compounds; Temperature dependence; 固有振動モード; 高温弾性率

The elastic constants are fundamental material constants. Measurements of single crystal elastic constants have been usually performed by ultrasonic techniques, which essentially measure the velocity of elastic waves propagating in a material ; the specimen size required is typically about 10mm in length. It is not always easy to obtain single crystal specimens of such a size, in particular of "new materials". The alternative method which allows the use of smaller specimens is the rectangular parallelepiped resonance (RPR) method.In the RPR method, the measurement of the resonance spectrum is relatively easy, but the analysis of the spectrum to derive the elastic constants is laborious. We have developed a systematic and efficient method of analysis of the resonance spectrum valid for cubic symmetry crystals. The new method allows the analysis by a conventional personal computer. We apply the method to determine of the elastic constants of several intermetallic compounds in wide temperature range, from 77K to 1200K.The resonance frequencies in such a wide temperature range are obtained by a newly constructed apparatus. In the conventional method, the analysis of the RPR spectrum is made without any information on the vibrational mode of each resonance peak. To overcome this essential shortcoming, we have attempted to determine the resonance mode of each resonance peak by measurement of the symmetry of the deformation of the specimen. A new apparatus with two transducers to detect the displacements has been constructed, and used successfully to determine the vibrational mode.

弹性常数是基本的材料常数。单晶体弹性常数的测量通常采用超声波技术，主要是测量弹性波在材料中的传播速度;所需的样品尺寸通常约为10 mm长。获得这种尺寸的单晶样品并不总是容易的，特别是“新材料”。矩形平行六面体共振（RPR）法是一种允许使用较小试件的替代方法。在RPR法中，共振谱的测量相对容易，但通过分析共振谱来获得弹性常数却很费力。我们发展了一种系统而有效的分析立方对称晶体共振谱的方法。新方法允许通过传统的个人计算机进行分析。我们用这种方法测定了几种金属间化合物在77 ~ 1200 K宽温区的弹性常数，并用一种新的装置测定了宽温区的共振频率。在常规方法中，在没有关于每个共振峰的振动模式的任何信息的情况下进行RPR谱的分析。为了克服这一基本缺点，我们试图通过测量试样变形的对称性来确定每个共振峰的共振模式。研制了一种双传感器位移检测装置，并成功地用于振动模态的测定。

项目成果

K.Tanaka, H.Yasuda, H.Numakura and M.Koiwa: ""Determination of Elastic Constants By the Rectangular Parallelepiped Resonance Method"" Proc. of PRICM-1. 491-494 (1992)

K.Tanaka、H.Yasuda、H.Numakura 和 M.Koiwa：“通过矩形平行六面体共振法测定弹性常数”Proc。

K.Tanaka: "Determination of elastic constants by the rectangular parallelepiped resonance method" Proceedings of 1st PRICM on Advanced Materials and Processing. (1993)

K.Tanaka：“通过长方体共振法测定弹性常数”第一届 PRICM 先进材料与加工论文集。

K.Tanaka: "Temperature dependence of elastic constants of several intermetallic compounds." Proc.3rd Japan International SAMPE Symposium. 1171-1174 (1993)

K.Tanaka：“几种金属间化合物的弹性常数的温度依赖性。”

H.Yasuda, T.Takasugi and M.Koiwa: ""Elasticity of Ni-based L1_2-type Intermetallic Compounds"" Acta metall.mater.40. 381-387 (1992)

H.Yasuda、T.Takasugi 和 M.Koiwa：“镍基 L1_2 型金属间化合物的弹性”Acta metal.mater.40。

H.Yasuda: "Elasticity of Ni-based LI_2-type Intermetallic Compounds" Acta metall.mater.40. 381-387 (1992)

H.Yasuda：“镍基LI_2型金属间化合物的弹性”Acta metal.mater.40。