Measurement of the mechanical properties of soccer balls using digital image correlation method

2015 ◽  
Vol 12 (1) ◽  
pp. 69-76 ◽  
Author(s):  
Alireza Karimi ◽  
Reza Razaghi ◽  
Mahdi Navidbakhsh ◽  
Toshihiro Sera ◽  
Susumu Kudo
Keyword(s):  
Mechanical Properties ◽  
Digital Image Correlation ◽  
Digital Image ◽  
Correlation Method ◽  
Image Correlation ◽  
Digital Image Correlation Method

Unable to Detect Burial Defective Rubber Sheet in Digital Image Correlation Method

2015 ◽  
Vol 665 ◽  
pp. 209-212
Author(s):  
Dong Chang Li ◽  
Huang Chao ◽  
Qu Jia
Keyword(s):  
Mechanical Properties ◽  
Digital Image Correlation ◽  
Large Deformation ◽  
Digital Image ◽  
Optical Sensors ◽  
Correlation Method ◽  
Image Correlation ◽  
Rubber Material ◽  
Rubber Sheet ◽  
Digital Image Correlation Method

Rubber material is non-linear, hyper-elastic and incompressible. Its complex mechanical properties increase the difficulties of the theoretical calculation in large deformation. As the development of computing capacity and optical sensors, DIC (Digital Image Correlation) method has become an important method in measuring large deformation of rubber material. In this paper, DIC method was used to measure different depth of burial defective rubber in tensile test, the result, however, failed to test the burial defects of rubber sheet. In order to explore the failure mechanism, the finite element simulation test is completed using Mooney-Rivlin material model of two parameters. The undetected phenomenon is caused by rubber’s hyper elasticity and low-rigidity. The results show that DIC method can be effectively applied to the measurement and evaluation of mechanical properties of rubber-like material’s surface defects, but not its burial defects. The fact that DIC method is unable to detect the burial defects of rubber sheet should be paid more attention.

Investigation on Micro-Tensile Test System Platform Used for Test of the Weld

2016 ◽  
Vol 725 ◽  
pp. 55-59
Author(s):  
Tian Ye ◽  
Bu Shen Zhang ◽  
Jie Jian Liu ◽  
Tao Suo
Keyword(s):  
Mechanical Properties ◽  
Digital Image Correlation ◽  
Tensile Test ◽  
Digital Image ◽  
Measurement Accuracy ◽  
Electron Beam Welding ◽  
Correlation Method ◽  
Test System ◽  
Image Correlation ◽  
Digital Image Correlation Method

In this paper, the mechanical properties of electron beam welding TC4 titanium alloy in different regions of the welded joint were studied by using the Micro-tensile test device and digital image correlation method. In the research, the problem of sample's gripping, strain measurement accuracy, load measurement and lens distortion verification are solved. The main work is as follows: The digital image correlation method, which is non-contact, full field measurement, simple, easy operation and high accuracy, is used to measure the strain of the micro tensile specimen, the fine speckle technique for micro mechanical property testing is developed, furthermore, the measurement accuracy of the digital image correlation method for the micro sample is discussed. Finally, the Micro-tensile test system platform is built which can be used to test the micro mechanical properties of the weld.

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