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RISS 인기검색어
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- 저자 : Mohammad Lakhi (검색결과 2 건)
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Hamid Bohluli,Mohammad Lakhi,Masoud Rakhshkhorshid 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.8
In this research, the effect of per pass applied strain on the mechanical and electrical properties of commercial pure copperin twist extrusion process was investigated. For this, two dies with different twist angles of 37° and 56° (called dies A and B,respectively) were manufactured to perform the process in 8 passes. Finite element simulation was used to find the averageper pass applied strain in the investigated dies. Compressive testing and hardness testing were used to assess the mechanicalproperties of the samples processed up to different passes. Also, the optical micrographs accompanying with SEM imageswere prepared from the samples to explain the effect of the applied strain on the grain refinement and the consequent mechanicalproperties. Comparison of the samples processed in dies A and B with the same accumulated strain showed that reducingper pass applied strain causes the improvement in the mechanical properties of the samples. The results also showed that theelectrical resistance of the samples changes in proportion to the changes in the mechanical properties.
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Measurement of local strain: machine vision and finite element method
Seyyed Ehsan Eftekhari Shahri,Mohammad Lakhi,Sadegh Ranjbar 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.3
Determining the material deformation behavior including local strain data is very useful for analyzing the forming processes. In order to measure strain properties, the uniaxial tensile test was used. More than 10 important mechanical properties were obtained from the uniaxial tensile test. However, through this test, only one strain in the tensile direction can be reported. Obtaining strain at various points in the transverse and longitudinal directions can provide important information about anisotropy, the Poisson’s ratio and material heterogeneity. In this study, machine vision method along with graphical programming were used for automatic strain calculations. Also, an innovative numerical method was developed based on machine vision procedure. In this new method, a number of circles were carved as a matrix pattern on the finite element model. Removing the limitations of the machine vision method, including its sensitivity to vibration, is the most important advantage of this numerical model. The results of the finite element method were evaluated in comparison with the tensile test and the machine vision procedure.
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