Analysis and Design of Energy Absorbing Flexurally Loaded Pultruded Tubes

吸能弯曲加载拉挤管的分析与设计

基本信息

批准号：
9713566
负责人：
Lawrence Bank
金额：
$ 18.92万
依托单位：
University of Wisconsin-Madison
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
1998
资助国家：
美国
起止时间：
1998-03-01 至 2002-02-28
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9713566&HistoricalAwards=false
关键词：
Analysis Design Energy Absorbing Flexurally

项目摘要

9713566 Bank This project will study the energy-absorption capacity of composite material tubes when loaded in bending. The ability to absorb energy in flexural deformation is required in framed structural systems. This flexural energy absorption capacity is a central tenant of the design philosophy of steel and reinforced concrete structures, since it allows these structures to develop "plastic-hinge" mechanisms prior to failure. Such "hinges" provide reserve capacity, overall ductility, and an all-important safeguard against catastrophic failure. It is the objective of this project to demonstrate that pseudo-plastic hinges can develop in composite material tubular beams, thus, imparting to composite structural frames an energy- absorption capacity analogous to that found in conventional steel or reinforced concrete frames. The mechanism by which a composite material tubular beam develops "stable" energy absorption is, however, very different from that of a steel or reinforced concrete beam. In these conventional beams, the energy absorption is obtained due to irreversible plastic strain in the elasto-plastic materials. It is the purpose of this study to show that in a composite material tubular beam, energy is absorbed in a stable manner by progressive "tearing failure" at the tube corners, and that this provides the beam with a behavior analogous to that of an elasto-plastic beam. Such a phenomenon has recently been reported but an in-depth study has not been conducted. This research will investigate the phenomenon in-depth, by use of experimentation and numerical modeling, and provide recommendations for design. ***

9713566银行该项目将在装载弯曲时研究复合材料管的能量吸收能力。在框架结构系统中需要吸收能量在弯曲变形中的能力。这种弯曲能量吸收能力是钢和钢筋混凝土结构设计理念的核心租户，因为它允许这些结构在失败之前开发“塑料 - 铰链”机制。这种“铰链”提供了储备能力，整体延展性和最重要的防御灾难性故障。该项目的目的是证明伪塑料铰链可以在复合材料管状束中发展，因此，将复合结构框架赋予了与常规钢或钢筋混凝土框架相似的能量吸收能力。然而，复合材料管状束产生“稳定”能量吸收的机制与钢或钢筋混凝土束的机制非常不同。在这些常规梁中，由于弹性塑料材料中的不可逆塑性应变而获得能量吸收。这项研究的目的是表明，在复合材料管状束中，通过在管角上进行性“撕裂失败”以稳定的方式吸收能量，并且这为光束提供了类似于弹性塑料束的行为。最近已经报道了这种现象，但尚未进行深入研究。这项研究将通过使用实验和数值建模来研究深入的现象，并为设计提供建议。 ***