In this study, the digital image correlation method(with Newton-Raphson iteration
method) is used to measure the in-plane deformation of poly-crystal aluminum. When the specimen
is exerted a tensile load, the strain distribution of the specimen surface will be inhomogeneous. The
micro-deformation of the poly-crystal aluminum is studied under a SEM(scanning electron
microscope), a series of images of the micro crystal are captured during the loading process. By
using digital image correlation to analyze the images, the displacement and strain of a micro-crystal
are obtained, which provide important data for further analysis of the inhomogeneous properties of
the poly-crystal aluminum.
Combined with the new development of protecting pile of foundation pits in Ningbo soft soil area. On the premise of summarizing the present calculation of supporting structure, contrasting borehole case-in-place pile of circular cross section with rectangular borehole case-in-place pile and soldier piles according to the theory of equal-rigidity calculation and the analysis of reinforcing quantity calculation. we figure out that the rectangular borehole case-in-place pile have an potential in saving materials.
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