کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
735597 1461738 2014 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Digital speckle based strain measurement system for forming limit diagram prediction
ترجمه فارسی عنوان
سیستم اندازه گیری فشار بر پایه دیجیتال برای تعیین پیش بینی نمودار محدود
کلمات کلیدی
الگوی الگوی دیجیتال، تغییر شکل بزرگ، اندازه گیری فشار، نمودار محدود تشکیل
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی برق و الکترونیک
چکیده انگلیسی


• A strain measurement system for forming limit diagram prediction is developed.
• A fractionized matching algorithm for large deformation measurement is proposed.
• A spline model is specially used to calculate the strain of the sheet metal in deep drawing.
• The effectiveness of our system is demonstrated by evaluation experiment.
• A feasible solution for investigating forming limit diagram of metal sheet is discussed.

A digital speckle based strain measurement system is developed to investigate the forming limit diagram (FLD) of sheet metal. A stochastic speckle pattern is sprayed on the surface of flat sheet metal before forming. A series of images are recorded by two cameras during the forming process. The strain field is then calculated for FLD determination, which involves the following key issues. First, to solve the problem of large deformation and strain measurement in sheet metal forming, a fractionized matching algorithm using deformation continuity of adjacent images is proposed. Second, an algorithm for three-dimensional (3-D) strain calculation is discussed, and a spline model is specially used to calculate the strain of the sheet metal in deep drawing. Third, a limit strain determination algorithm is proposed for forming limit curve (FLC) calculation by creating sections in the measured strain fields. Finally, a forming limit strain measurement system (also called Xi'an Jiaotong University Forming Limit Curve measurement system, XJTUFLC) is developed on the Visual Studio 2010 platform. With our self-developed image acquisition instrument and sheet metal bulging setup, FLD determination tests are conducted to validate the performance of the system. And the measured FLD is compared with the traditional experimental FLD as well as with that predicted by the empirical model. From the analysis of the experimental results, it can be concluded that the proposed system is feasible to measure the full-field strain during sheet metal forming processes and provides a better solution for forming limit diagram prediction.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Optics and Lasers in Engineering - Volume 55, April 2014, Pages 12–21
نویسندگان
, , , , ,