Papers by Keyword: Shearing Test

Abstract: Following with the development of construction industry, small diameter anti-sliding pile has been widely implemented in slope stabilization and deep foundation support. Much attention has been paid on researching lateral resistance of pile body. By orthogonally testing factors of small diameter anti-slide reinforcement pile models including concrete strength, sectional dimension and reinforcement bar gauge, The article analyzed sensitive influence to lateral resistance of pile body. The results indicate that concrete strength appears the most sensitive factor, next sectional dimension, and then reinforcement bar gauge. By comparing with shearing test of small diameter anti-slide reinforcement pile models, the conclusion follows that reinforcement of pile body does not fully unleash its shear resistance characteristic. Thus conclusion provides reference for implementation and designing of small diameter anti-slide pile.

Abstract: Core cracking and face/core separation (debonding) are common failure modes in foam cored sandwich structures, aluminum alloy foam sandwich is prepared in this experiment, shearing tests were conducted on precursor and sandwich panel specimens. Shearing test results showed if the porosity was not uniform and have super-big pores, the interface was not firmly；and porosity was uniform, so the bonding interface was tightly and under force the strength of aluminum sheet was lower than the foam core/aluminum sheet interface. Analysis the results fracture pattern of aluminum sheet/powders interface belongs to interface brittle debonding; and if the strength of pore wall was lower than aluminum face sheet, fracture pattern of foam core/aluminum sheet began ductile and transited to cleavages fracture.

Abstract: The strain paths followed by metals during sheet forming can be quite complex, especially when successive forming steps are involved. The work hardening of metals associated with these strain paths differs from that caused only by monotonic straining, such as simple tension or compression. It is important to have an adequate description of the work hardening of the material under processing, especially when numerical simulations of the forming are used. The experimental evaluation of the effect of strain path changes on the material work hardening is usually performed through tensile testing following the strain path changes. This technique, however, demands complex machining operations of the formed sheets and the imposed strain is severely limited by impending necking. The present paper utilizes simple shear as a tool for the determination of the work hardening of CuZn34 brass sheets following various strain path changes associated with combinations of different modes of deformation such as rolling, tension, cyclic and forward shears. The results indicate that the cyclic shearing delays the occurrence of plastic instabilities for brass previously tensioned, occurring the opposite for final monotonic shearing. These phenomena were correlated with the probable microstructural evolution of the CuZn34 brass.

Abstract: The two-dimensional deformation of wood with different grains under shearing loads was measured using an electronic speckle pattern interferometry (ESPI) technique. The radical, tangential and end sections of Douglas firs (Pseudotsuga menziesii) were used as specimens. Results revealed that the deformation values significantly vary for every part of the specimens, and the ring directions of earlywood and latewood, which compose the annual rings, have an effect on the two-dimensional deformation of wood.

Abstract: The two-dimensional deformation of wood under shearing loads is measured using an electronic speckle pattern interferometry (ESPI) technique. The radical and tangential sections of Douglas firs are used as specimens in the longitudinal direction. Results reveal that large two-dimensional deformation of the wood can be measured using the ESPI technique, the deformation values significantly vary for every part of the specimens, and the ring directions of earlywood and latewood, which compose the annual rings, have an effect on the two-dimensional deformation of wood.