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Experimental investigation of arbitrary non-linear load paths using a feedback controller in combination with a conventional sheet metal testing machine and a special tool for cruciform specimens

使用反馈控制器结合传统钣金试验机和十字形样品专用工具对任意非线性载荷路径进行实验研究

基本信息

批准号：
389864979
负责人：
Professor Dr.-Ing. Wolfram Volk
金额：
--
依托单位：
Lehrstuhl für Umformtechnik und Gießereiwesen
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2018
资助国家：
德国
起止时间：
2017-12-31 至 2019-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/389864979?language=en
关键词：
Experimental investigation arbitrary non linear

项目摘要

The prediction of formability is one of the most important tasks in sheet metal forming. The combination of growing demands on design and rising cost pressures implies the further exploit of forming limits. The prediction of non-linear load paths is a critical aspect. Nowadays, several tools and presses are necessary for the experimental investigation of arbitrary non-linear load paths. The experimental validation of the proposed methods, which help solve the problem, is still challenging because of the high amount of costs and time needed. Therefore, the main goal of the research project is the partly automated experimental investigation of given arbitrary non-linear load paths using a sheet metal testing machine. The interrelationships between the effective drawbead height and the blankholder force and their impact on the strain ratio are carried out using a big experimental and numerical data base. Another objective is the design of a feedback controller and its integration into a present experimental setup for material characterization. In combination with a special tool for cruciform specimens the experimental setup is able to cover non-linear load paths experimentally. Thus an economic validation of corresponding simulated non-linear load paths can be realized using one specimen and one tool. This gives the possibility to make a contribution to an improved prediction of the formability of complex parts.

板料成形过程中的成形性预测是最重要的工作之一。日益增长的设计需求和不断上升的成本压力相结合，意味着对成形极限的进一步开发。非线性负荷路径的预测是一个关键的方面。目前，要对任意非线性加载路径进行实验研究，需要多种工具和压力机。所提出的有助于解决问题的方法的实验验证仍然具有挑战性，因为需要大量的成本和时间。因此，研究项目的主要目标是利用板材试验机对给定的任意非线性加载路径进行部分自动化的试验研究。利用大型实验和数值数据库，研究了有效拉深筋高度与压边力之间的相互关系及其对应变比的影响。另一个目标是设计一个反馈控制器，并将其集成到目前的材料表征实验装置中。与十字形试件的专用工具相结合，该实验装置能够在实验上覆盖非线性加载路径。因此，可以使用一个试件和一个工具来实现对相应的模拟非线性加载路径的经济验证。这为改进复杂零件的成形性预测提供了可能。