Optical full-field measurement methods are now widely applied in various domains.In general,the displacement fields can be directly obtained from the measurement,however in mechanical analysis strain fields are prefer...Optical full-field measurement methods are now widely applied in various domains.In general,the displacement fields can be directly obtained from the measurement,however in mechanical analysis strain fields are preferred.To extract strain fields from noisy displacement fields is always a challenging topic.In this study,a finite element method for smoothing displacement fields and calculating strain fields is proposed.An experimental test case on a holed aluminum specimen under tension is applied to validate this method.The heterogeneous displacement fields are measured by digital image correlation(DIC).By this proposed method,the result shows that the measuring noise on experimental displacement fields can be successfully removed,and strain fields can be reconstructed in the arbitrary area.展开更多
基金supported by the National Basic Research Program of China("973"Project,Grant No.2010CB631005,2011CB606105)the National Natural Science Foundation of China(Grant No.10625209,10732080,90916010)+2 种基金China Postdoctoral Science Foundation(Grant No.20090460335)Specialized Research Fund for the Doctoral Program of Higher Education(Grant No.20090002110048)the opening funds from the State Key Laboratory of Explosion Science and Technology(KFJJ10-18Y)
文摘Optical full-field measurement methods are now widely applied in various domains.In general,the displacement fields can be directly obtained from the measurement,however in mechanical analysis strain fields are preferred.To extract strain fields from noisy displacement fields is always a challenging topic.In this study,a finite element method for smoothing displacement fields and calculating strain fields is proposed.An experimental test case on a holed aluminum specimen under tension is applied to validate this method.The heterogeneous displacement fields are measured by digital image correlation(DIC).By this proposed method,the result shows that the measuring noise on experimental displacement fields can be successfully removed,and strain fields can be reconstructed in the arbitrary area.
