The normalization method has been employed to estimate the J-resistance (J—R) curves for C-shaped outside edge-notched compression (COEC) specimens of SA-508 steel. The COEC specimens present the lowest J—R curves i...The normalization method has been employed to estimate the J-resistance (J—R) curves for C-shaped outside edge-notched compression (COEC) specimens of SA-508 steel. The COEC specimens present the lowest J—R curves in comparison with other three types of specimens. Based on the J—Q—M met hod, the constraint parame ter Q determined at the mid-plane in the through-thickness direction of the specimen is used to approximately quantify the threedimensional crack-tip constraint for COEC specimens. Combining with the previous experiments on J—R curves, the constraint-coirected J—R curves for SA-508 steel specimens are given, which may be used to predict the fracture toughness of actual cracked components in structural integrity assessment.展开更多
Multiscale mechanics is about multi-scale correlation and strong coupling between scales,which widely exists in engineer-ing applications with a broad range of spatial and temporal scales.The averaging method and the ...Multiscale mechanics is about multi-scale correlation and strong coupling between scales,which widely exists in engineer-ing applications with a broad range of spatial and temporal scales.The averaging method and the perturbation method have been employed in the past to deal with weak coupling problems.For strong coupling problems,the methods based on small parameter expansion are no longer applicable.Fluid turbulence and solid fail-ure are two typical cases in nonlinear mechanics[1-3].The chal-lenge of turbulence arises from the cascade of momentum,energy,and other conserved quantities across a wide range of spatial and temporal scales.The solid failures in heterogeneous media,on the other,result from the trans-scale cascade of micro-damage evolu-tions.展开更多
基金the National Natural Science Foundation of China (Grant No. 11872320).
文摘The normalization method has been employed to estimate the J-resistance (J—R) curves for C-shaped outside edge-notched compression (COEC) specimens of SA-508 steel. The COEC specimens present the lowest J—R curves in comparison with other three types of specimens. Based on the J—Q—M met hod, the constraint parame ter Q determined at the mid-plane in the through-thickness direction of the specimen is used to approximately quantify the threedimensional crack-tip constraint for COEC specimens. Combining with the previous experiments on J—R curves, the constraint-coirected J—R curves for SA-508 steel specimens are given, which may be used to predict the fracture toughness of actual cracked components in structural integrity assessment.
文摘Multiscale mechanics is about multi-scale correlation and strong coupling between scales,which widely exists in engineer-ing applications with a broad range of spatial and temporal scales.The averaging method and the perturbation method have been employed in the past to deal with weak coupling problems.For strong coupling problems,the methods based on small parameter expansion are no longer applicable.Fluid turbulence and solid fail-ure are two typical cases in nonlinear mechanics[1-3].The chal-lenge of turbulence arises from the cascade of momentum,energy,and other conserved quantities across a wide range of spatial and temporal scales.The solid failures in heterogeneous media,on the other,result from the trans-scale cascade of micro-damage evolu-tions.
