US 12,135,312 B2
Stress and strain amount distribution display method, device, and program
Myeong-heom Park, Kyoto (JP)
Assigned to JAPAN SCIENCE AND TECHNOLOGY AGENCY, Kawaguchi (JP)
Appl. No. 17/621,340
Filed by JAPAN SCIENCE AND TECHNOLOGY AGENCY, Kawaguchi (JP)
PCT Filed Jun. 15, 2020, PCT No. PCT/JP2020/023458
§ 371(c)(1), (2) Date Dec. 21, 2021,
PCT Pub. No. WO2020/262087, PCT Pub. Date Dec. 30, 2020.
Claims priority of application No. 2019-118848 (JP), filed on Jun. 26, 2019.
Prior Publication US 2022/0412856 A1, Dec. 29, 2022
Int. Cl. G01N 3/20 (2006.01); G01B 11/16 (2006.01); G01N 3/06 (2006.01)
CPC G01N 3/20 (2013.01) [G01B 11/165 (2013.01); G01N 3/068 (2013.01); G01N 2203/0075 (2013.01); G01N 2203/0647 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A method of displaying stress distribution on a sample surface while repeatedly loading and unloading the sample, comprising:
capturing images of a sample surface before loading, during the loading, and after unloading;
measuring a first strain amount for each pixel position based on correlation between the image before the loading and the image after the unloading;
measuring a second strain amount for each pixel position based on correlation between the image before the loading and the image during the loading;
calculating stress for each pixel position based on the difference between the first strain amount and the second strain amount;
displaying the distribution of the calculated stress at each pixel position;
calculating the difference in stress displayed at the same pixel position between stress distribution obtained by the last loading and unloading and stress distribution obtained by the current loading and unloading, and
displaying a pixel position at which the difference is equal to or greater than a predetermined threshold value.