Study on the Duration of Impact in Elastic-Plastic Impact of Bodies.

物体弹塑性冲击中冲击持续时间的研究。

• 批准号: 61550064
• 负责人: DAIMARUYA Masashi
• 金额: $ 1.22万
• 依托单位: Muroran Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1986
• 资助国家: 日本
• 起止时间: 1986 至 1987
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-61550064/
• 关键词: Impact Plasticity; Plastic Impact; Impulsive Force; Impact End Stress; Duration of Impact; Strain-Rate Sensitivity; Sensing Plate; 検力円柱

1. Two kinds of methods for measuring an impulsive force generated at the impact end of a body subjected to impact loading were developed. The sensing circular plate and the sensing cylinder were produced by way of trial. Both methods using them were confirmed by calibration tests to be effective for directly measuring not only the impulsive force but also the duration of impact. The measurement was almost entirely free from disturbance caused by interference from reflected waves.2. The dynamic behavior of an elastic bar with a variable cross-section was studied theoretically and experimentally. Experiments of elastic impact were performed for two different truncated cones by impacting them against the sensing plate. The time variation of stress at the impact end of the truncated cones colliding with the sensing plate and the elastic response at several locations along the cones were measured. The theoretical predictions agreed well with the observed results.3. Plastic impact tests wer … More e made for pure copper and aluminum specimens with several different lengths by impacting them on the sensing plate or the sensing cylinder. The specimens bars were shot from a high-pressure air gun, built as a trial. The variations of stress vs. Time at the impact end of the specimens colliding the sensing cylinder and the duration of impact were measured at various impact velocities. The experimental results were compared with the theoretical predictions based on the strain-rate dependent theory of plastic wave propagation.Close agreement between the observed and the calculated values was obtained. The initial elevation of the impact end stress is strongly affected by the rise time of impact and its mode of rising, but the duration of impact is almost entirely uninfluenced by those impact conditions. The duration of impact is governed by the strain-rate sensitivity of materials and the impact velocity as well as the bar length.4. An electromagnetic transducer to record the particle velocities in longitudinal wave propagation in bars is made by way of trial. Less

1.提出了两种测量物体受冲击时冲击端冲击力的方法。通过试制，制作了传感圆板和传感筒。使用它们的两种方法都被校准测试证实是有效的，不仅直接测量冲击力，而且还持续时间的影响。测量几乎完全不受反射波干扰的影响.对变截面弹性杆的动力特性进行了理论和实验研究。对两种不同形状的截锥进行了弹性碰撞实验。测量了截锥与敏感板碰撞时冲击端应力随时间的变化以及沿锥沿着多个位置的弹性响应。理论预测与观测结果吻合较好.塑料冲击试验 ...更多信息 通过将不同长度的纯铜和铝试样撞击在传感板或传感筒上，制成了一种新型的传感器。这些试棒是用高压气枪射出的，作为试验。在不同的冲击速度下，测量了试件冲击端与敏感筒的应力随时间的变化以及冲击持续时间。将实验结果与基于应变率相关塑性波传播理论的理论预测进行了比较，实验值与计算值吻合较好。冲击端部应力的初始升高受冲击的上升时间及其上升模式的强烈影响，但冲击的持续时间几乎完全不受这些冲击条件的影响。冲击的持续时间取决于材料的应变率敏感性和冲击速度以及杆的长度.本文试制了一种记录纵波在棒中传播时质点速度的电磁换能器。少

项目成果

台丸谷政志: 日本機械学会論文集(A編). 53. 2324-2330 (1987)

Masashi Daimaruya：日本机械工程师学会会议记录（A 版）53. 2324-2330 (1987)。

M.Daimaroya: Journal of Sound and Vibration. 120. (1988)

M.Daimaroya：声音与振动杂志。

台丸谷政志: 日本機械学会論文集(A編). 53. 975-979 (1987)

Masashi Daimarutani：日本机械工程师学会会议记录（A 版）53. 975-979 (1987)。

台丸谷政志: 材料(日本材料学会論文集).

Masashi Daimarutani：材料（日本材料学会会刊）。

M. Daimaruya: "Duration of Contact at Plastic Impact of a Bar ( 2nd Report, Discussions on a Constitutive Equation and a Method for Measuring the Duration of Impact)" Transactions of the Japan Society of Mechanical Engineers. 53. 970-974 (1987)

M. Daimaruya：“棒材塑性冲击下的接触持续时间（第二次报告，关于本构方程和测量冲击持续时间的方法的讨论）”日本机械工程师学会会刊。