Deformation and texture evolution of AZ31 B magnesium（Mg） alloy sheet under uniaxial tension, compression, and reverse loading after different pre-strain（compression and tension） were investigated experimentally. ...Deformation and texture evolution of AZ31 B magnesium（Mg） alloy sheet under uniaxial tension, compression, and reverse loading after different pre-strain（compression and tension） were investigated experimentally. The results indicate that the pre-compressive strain remarkably affects the reverse tensile yield stress and the width of the detwinning-dominant stage during inverse tension process. Similar to stress–strain curve of the uniaxial compression, the curve of reverse tensile yield value also has ‘S＇ shape, and its minimum value is only 38 MPa. The relationship between pre-compressive strain and the width of detwinning-dominant stage presents a linear growth, and the greater the precompressive strain is, the smaller the strain hardening rate of the detwinning-slip-dominant stage is. Compared with the reverse tension under pre-compression, the influence of the pre-tension deformation on the deformation mechanism of subsequent compression is relatively simple. With the increase in pre-tension strain, the yield stress of the reverse loading is rising.展开更多
The present study develops a novel type of active joint node-bolt fasten wedge(BFW)active joints,aiming to investigate the load-bearing capacity of a BFW joint in a quantitative way and put forward precise formulas fo...The present study develops a novel type of active joint node-bolt fasten wedge(BFW)active joints,aiming to investigate the load-bearing capacity of a BFW joint in a quantitative way and put forward precise formulas for its yield load and compression rigidity.To achieve this,indoor axial loading tests were conducted on two BFW joints,accompanied by a set of numerical simulations with the finite element approach implemented in ABAQUS.Parametric research was then conducted to assess the impact of various factors on the yield load and initial compression rigidity of BFW joints,leading to the derivation of precise calculation formulas for accurate prediction of these parameters.The key findings indicate that enhancing the bolt strength from 10.9 to 12.9 significantly improves mechanical performance.Under axial compression,the final bearing force,yield load,and initial compression rigidity increase by 0.86,1.06,and 0.15 times,respectively.Numerical models accurately predict joint behavior under axial force,confirming their reliability.Parameter studies reveal that increasing web and eaves thickness,bolt strength,and diameter improves bearing capacity,while splint thickness has little effect.The fitting formulas introduced can precisely estimate yield load and rigidity,providing practical value for engineering applications.展开更多
基金supported by the National Nature Science Foundation of China (No. 51174189)
文摘Deformation and texture evolution of AZ31 B magnesium（Mg） alloy sheet under uniaxial tension, compression, and reverse loading after different pre-strain（compression and tension） were investigated experimentally. The results indicate that the pre-compressive strain remarkably affects the reverse tensile yield stress and the width of the detwinning-dominant stage during inverse tension process. Similar to stress–strain curve of the uniaxial compression, the curve of reverse tensile yield value also has ‘S＇ shape, and its minimum value is only 38 MPa. The relationship between pre-compressive strain and the width of detwinning-dominant stage presents a linear growth, and the greater the precompressive strain is, the smaller the strain hardening rate of the detwinning-slip-dominant stage is. Compared with the reverse tension under pre-compression, the influence of the pre-tension deformation on the deformation mechanism of subsequent compression is relatively simple. With the increase in pre-tension strain, the yield stress of the reverse loading is rising.
基金the financial support provided by Beijing Natural Science Foundation(Grant No.8222005)the Natural Science Foundation of China(Grant No.51978018)Science and Technology Funding Scheme for the Third Construction Engineering Company Ltd.of China Construction Second Engineering Bureau(Grant No.CSCEC2b3c-2021-K-65).
文摘The present study develops a novel type of active joint node-bolt fasten wedge(BFW)active joints,aiming to investigate the load-bearing capacity of a BFW joint in a quantitative way and put forward precise formulas for its yield load and compression rigidity.To achieve this,indoor axial loading tests were conducted on two BFW joints,accompanied by a set of numerical simulations with the finite element approach implemented in ABAQUS.Parametric research was then conducted to assess the impact of various factors on the yield load and initial compression rigidity of BFW joints,leading to the derivation of precise calculation formulas for accurate prediction of these parameters.The key findings indicate that enhancing the bolt strength from 10.9 to 12.9 significantly improves mechanical performance.Under axial compression,the final bearing force,yield load,and initial compression rigidity increase by 0.86,1.06,and 0.15 times,respectively.Numerical models accurately predict joint behavior under axial force,confirming their reliability.Parameter studies reveal that increasing web and eaves thickness,bolt strength,and diameter improves bearing capacity,while splint thickness has little effect.The fitting formulas introduced can precisely estimate yield load and rigidity,providing practical value for engineering applications.
