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实验力学 2010
Study of Load Transfer in Compression Shear Test based on Digital Photoelasticity
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Abstract:
An improved six-step phase-shifting method was proposed to calculate the full-field shear stress based on a four-step color phase-shifting method in digital photoelasticity. This method was verified by radial compression of a disk, then further study of interlaminar shear behavior in compressive shear test for connection structure made of homogeneity material was carried out. Experimental results reveal that isochromatic fringe order and shear stress are distributed continuously and increased with compression increasing. However, shear stress goes to zero and isochromatic fringe order decreases to valley-bottom at midline of the specimen. They reach peaks at two compressive shear sections, and especially the maximum values appear at four right-angle edges. It means that the cracking would be happened firstly at those edges. Under the load of 705.6N, the fringe peaks and shear stresses at right-angle edges reach to 3.5 orders and 2.4MPa, respectively. Stress transfer in a connection structure is mainly realized by interlaminar shear, while shear stress is basically balanced with the applied load at connection interface.
