权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Relation Between the Shape of Impact End and Generated Impact Force

冲击端形状与产生冲击力的关系

基本信息

批准号：
61550081
负责人：
TANIMURA Shinji
金额：
$ 1.09万
依托单位：
University of Osaka Prefecture
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 1988
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-61550081/
关键词：
Collision Impact Force Impact End Contact Truncated Cone Plastic Dynamic Behavior 円すい形接触円すい形状

项目摘要

In designs for machine parts or structures to stand an impact loading, it is fundamentally important to know the outlines of the dynamic deformation at the contact part and of the impact force generated at that part. In a collision of machine parts or structures with each other or a collision of a flying object against a structure, the impact ranges usually from a few meters per second to tens of meter per second. Even if the impact speed is a few meters per second, an inelastic deformation or a crush may sometimes be produced at the contact part. This, therefore, makes the impact-end condition very complicated.Tanimura(1983) has devised a new, simple method which allows the impact force generated at the contact part to be measured directly. The technique u ilized a special sensing plate which was designed to deliver the equivalent effect to a sensing wall, as if small strain gages were embedded in the solid. Using the method, the dynamic plastic behavior and the impact force generated at a contact part were studied through the experiments in which various sizes of aluminum bars, whose ends were of a variety of shapes of truncated cones, collided against the sensing plate at various speed up to 11 m/s.Theoretical expressions have also been derived by which the impact force generated at the contact part can be predicted fairly well, for the both cases when a bar colliding is comparatively short and so the effect of wave propagation in the bar can be ignored, and when a bar colliding is comparatively long and the wave propagation effect can not be ignored. By comparing the theoretical curves with the measured impact force-time records, the effectiveness of the derived theoretical expressions has been confirmed.

在设计承受冲击载荷的机器零件或结构时，了解接触部分动态变形的轮廓以及该部分产生的冲击力至关重要。在机器部件或结构相互碰撞或飞行物体与结构碰撞时，冲击范围通常从每秒几米到每秒几十米。即使冲击速度为每秒几米，有时也会在接触部分产生非弹性变形或挤压。因此，这使得冲击结束条件变得非常复杂。Tanimura(1983)设计了一种新的、简单的方法，可以直接测量接触部分产生的冲击力。该技术利用了一种特殊的传感板，其设计目的是向传感壁提供等效的效果，就好像小应变计嵌入在固体中一样。利用该方法，通过实验研究了不同尺寸的铝棒（其端部为各种形状的截锥体）以高达 11 m/s 的不同速度碰撞传感板的动态塑性行为和接触部分产生的冲击力。还推导了理论表达式，通过该表达式可以很好地预测接触部分产生的冲击力，对于这两种情况，当棒材碰撞相对较短时，因此棒材中波传播的影响可以忽略不计，当棒材碰撞较长时，波传播的影响也不能忽略。通过将理论曲线与实测冲击力-时间记录进行比较，证实了推导的理论表达式的有效性。