杯凸试验机测试FLC曲线 - 新拓三维技术（深圳）有限公司

Experimental specimen

120X40、120X60、120X80A、120X80B、120X100、120X120、120X140、120X160、120X180，Nine specimens in all, each with four specimens, as shown in the figure below：

原试件

喷漆后的试件

Experimental scheme

The experiment was carried out with XTDIC-FLC, a new 3D sheet metal forming limit measurement system. Using digital image correlation method, speckles of black and white were sprayed on the surface of specimens.The strain field of specimens was calculated by taking a series of images during the deformation process with two industrial cameras. Then, according to the national standard, the image of the specimen before fracture is selected,and 3-5 sections perpendicular to the direction of fracture are drawn to derive the maximum principal strain and the minimum principal strain of all sections.By importing all the data into the xjtuflc software, the forming limit curve of the material can be obtained.

Measurement of FLC curve by cupping machine

Experimental process

（1）Preparing specimen by spraying black and white speckles on the surface of specimens

（2）Debugging sheet metal forming limit measurement system XTDIC-FLC

（3）Put the specimen into the cupping machine for stamping experiment,and the camera collects the data of each deformation state

synchronously.

（4）The strain field of each state of the specimen is obtained by processing the acquired image, and the cut-off line data at the time

of yield is obtained.

（5）The final FLC curve is obtained by importing all the transversal line data into the software for fitting.

放置试件

实验过程

Experimental result

Experimental data

试件应变场

左右相机变形数据

Data fitting

截线数据拟合

FLC数据拟合