Development and Application of the Unsteady Wave Sensing System by Using Embedded Gauges

嵌入式仪表非稳态波传感系统的开发与应用

• 批准号: 09650115
• 负责人: SATO Yasuhisa
• 金额: $ 2.11万
• 依托单位: Tohoku Gakuin University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09650115/
• 关键词: Material testing; PVDF gauge; Unsteady wave; PMMA; Polycarbonate; Aluminium; Hugoniot Curve; Plate-impact experiment; 物質内ゲージ; 非定常衝撃波; PMMA

Plate-impact experiments are conducted under the loading-reloading-unloading stress condition using a powder gun facility. We have developed the unsteady-wave-sensing-system (UWSS) to evaluate the unsteady wave propagation characteristics of the materials in the uniaxial strain state. The procedures are as follows.First, stress as a function of time at three locations in the specimen is measured by using polyvinylidene fluoride (PVDF) gauges. From these measurements, values of the phase velocities U ィイD1σィエD1associated with the stress profile of the wave can be obtained at two locations, which are respectively, in the middle of each pair of neighboring gauge locations. Second, particle-velocity profiles at these two locations can be computed from the conservation relation of momentum. Therefore, values of the other wave velocity UィイD1σィエD1 associated with the particle-velocity profiles can be found. Finally, the strain can then be obtained from integration of the conservation relation for mass.Results obtained in the region of our experimental stress for polymethyl methacrylate (PMMA) or polycarbonate (PC) or aluminium (JIS:A1lOO) are as follows.(1) Both the propagation velocities of stress and particle-velocity are sometimes different.(2) Regarding the stress-strain diagram, a point of transition from loading to reloading is almost on the Hugoniot curve, while a point of transition from reloading to unloading is above the Hugoniot curve.(3) The Hugoniot curve must be thought to be distinguished from characteristics including loading-history such as loading-reloading.

我们开发了非稳态波传感系统（UWSS），在加载-重载-卸载应力条件下进行板冲击实验，以评估材料在单轴应变状态下的非稳态波传播特性。程序如下。首先，使用聚偏二氟乙烯 (PVDF) 压力计测量样本中三个位置处的应力随时间的变化，根据这些测量值得出相位值。与波的应力分布相关的速度 U 可以在两个位置获得，这两个位置分别位于每对相邻规范位置的中间。 其次，可以根据守恒关系计算这两个位置的粒子速度分布。因此，可以找到与粒子速度剖面相关的另一个波速 D1σD1 的值，最后，可以通过对守恒关系进行积分来获得应变。在我们的聚甲基丙烯酸甲酯(PMMA)或聚碳酸酯(PC)或铝(JIS：A1100)的实验应力区域中获得的结果如下。(1)应力的传播速度和颗粒速度有时是不同的。 (2) 从应力-应变图来看，从加载到重载的转变点几乎都在Hugoniot曲线上，而从重载到重载的转变点几乎都在Hugoniot曲线上。卸载位于Hugoniot 曲线之上。(3) Hugoniot 曲线必须被认为与包括加载历史（例如加载-重新加载）在内的特征区分开来。

项目成果

Y.Sato: "On a Stress-Control Method by the Use of Laminated Impactor for the Plate Impact Experiments."Journal of the Society of Materials Science, Japan. Vol.47-No.1. 33-38 (1998)

Y.Sato：“关于板冲击实验中使用层压冲击器的应力控制方法。”日本材料科学学会杂志。

Y.Sato: "Application of the Unsteady Wave Sensing System to the Plate Impact Experiment."Journal of Materials Processing Technology. Vol.85. 43-47 (1999)

Y.Sato：“非稳态波传感系统在板材冲击实验中的应用。”材料加工技术杂志。

佐藤裕久: "ピエゾフィルム応力ゲージによるポリメタクリル酸メチルの衝撃応答の検討" 日本機械学会論文集. 63・616A. 2618-2623 (1997)

Hirohisa Sato：“使用压电薄膜应力计的聚甲基丙烯酸甲酯的冲击响应研究”日本机械工程师学会会刊 63・616A 2618-2623（1997）。

佐藤裕久: "ピエゾフィルム応力ゲージによるポリメタクリル酸メチルの衝撃応答の検討"日本機械学会論文集. 63. 2618-2623 (1997)

Hirohisa Sato：“使用压电薄膜应力计研究聚甲基丙烯酸甲酯的冲击响应”日本机械工程师学会会刊 63. 2618-2623 (1997)。

Y. Sato: "Application of the unsteady wave sensing system to the plate impact experiment"Journal of Material Processing technology. 85. 43-47 (1999)

Y. Sato：“非稳态波传感系统在板材冲击实验中的应用”材料加工技术杂志。