Study of similarity with distorted configurations of geometry via numerical models

IF 5.1 2区 工程技术 Q1 ENGINEERING, MECHANICAL
R.E. Oshiro , M. Alves
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引用次数: 0

Abstract

Due to technical restrictions, the construction of a scaled structure (model) with all required dimensions can pose challenge in certain experimental impact tests. Consequently, one of the dimensions of the structure may be distorted, infringing the prerequisite conditions for the Π theorem, and rendering similarity unattainable. In the present work, a method that changes the striker initial velocity in order to compensate for geometric distortion is analysed. The factors calculated in this technique allow estimating the real-size structure (prototype) by using scaled models. Initially, a structure comprising two plates clamped together and subjected to impact by a mass is employed to illustrate the method. Subsequently, two models with distorted thickness are tested through numerical simulations: a clamped tube struck by a rigid mass; a buffer bow colliding with a rigid wall. A comprehensive analysis of the results and the limitations of the method is done to ascertain the sources of errors and determine which structures types can benefit from this technique.

通过数值模型研究几何扭曲配置的相似性
由于技术上的限制,在某些实验性冲击测试中,要建造一个具有所有必要尺寸的按比例结构(模型)可能会遇到困难。因此,结构的某个尺寸可能会发生变形,从而违反了 Π 定理的前提条件,导致相似性无法实现。本研究分析了一种改变前锋初速度以补偿几何变形的方法。利用该技术计算出的系数,可以通过缩放模型估算出实际尺寸的结构(原型)。首先,使用了一个由夹在一起的两块板组成的结构来说明该方法,该结构受到一个质量块的冲击。随后,通过数值模拟测试了两个厚度变形的模型:被刚性质量撞击的夹紧管;与刚性壁碰撞的缓冲弓。对结果和该方法的局限性进行了综合分析,以确定误差来源,并确定哪些结构类型可从该技术中受益。
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来源期刊
International Journal of Impact Engineering
International Journal of Impact Engineering 工程技术-工程:机械
CiteScore
8.70
自引率
13.70%
发文量
241
审稿时长
52 days
期刊介绍: The International Journal of Impact Engineering, established in 1983 publishes original research findings related to the response of structures, components and materials subjected to impact, blast and high-rate loading. Areas relevant to the journal encompass the following general topics and those associated with them: -Behaviour and failure of structures and materials under impact and blast loading -Systems for protection and absorption of impact and blast loading -Terminal ballistics -Dynamic behaviour and failure of materials including plasticity and fracture -Stress waves -Structural crashworthiness -High-rate mechanical and forming processes -Impact, blast and high-rate loading/measurement techniques and their applications
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