Yield Strength Of Stainless Steel Research Articles

Calculation method for local–global interaction buckling capacity of stainless steel C-columns

In this paper, based on the completed experimental research, the C-section stainless steel column was simulated in ABAQUS, and the FEM results were compared with the test results to verify the accuracy of the FE model. On this basis, the FE model was used to carry out a parametric analysis of the local–global interaction (L-G) buckling capacity of the C-section stainless steel column, and the effects of the initial imperfection distribution mode, the mechanical properties of the material, and the improvement of the material strength in the corner region were investigated. When the initial geometric imperfection distribution mode is local buckling or L-G buckling, the change of imperfection shape has less effect on the occurrence of L-G buckling and the ultimate capacity of the member. Within a certain range, the stainless steel hardening coefficient and the increase strength of corner region on the L-G buckling capacity of stainless steel columns is small. The nominal yield strength of stainless steel has a more significant effect on the L-G buckling capacity. Finally, based on the parametric analysis results and the direct strength method, the calculation formula for the local–global interaction buckling capacity of stainless steel C-columns under axial compression is proposed, and the accuracy of the calculation results were verified by comparing with the test results.

BIOMECHANICAL EVALUATION OF LOCKING COMPRESSION PLATE (LCP) VERSUS DYNAMIC COMPRESSION PLATE (DCP): A FINITE ELEMENT ANALYSIS

Internal fixators are commonly used to treat long bone fractures, its aim is to provide interfragmentary compression, allow limited micromotion and provide stability to the bone for ambulation. However, complications such as non-unions, malunions and broken implant, can occur due to the complexity of mechanical force acting on the bone-plate models. Therefore, this study is proposed to investigate the biomechanical characterization of plate design on a tibia bone using finite element method. Two different designs; 1) locking compression plate (LCP) and dynamic compression plate (DCP) were simulated by using Marc.Mentat software. From the findings, the LCP have lower peak von Mises stress (VMS) distribution of 160 MPa compared to DCP with VMS value of 232 MPa. Surprisingly, the VMS of DCP plate system have exceed the yield strength of stainless steel (215 MPa) which translate to higher risk of failures. Moreover, the DCP plate system shows 50% lower stability compared to the LCP plate system, which has the peak displacement at 0.98 mm compared to the DCP bone at 1.53 mm. In conclusion, the LCP provides better stability and stress distribution up to 45% differences as compared to the DCP.

Performance of circular bimetallic tube confined concrete slender columns under eccentric compression

This paper aims to investigate the performance of thin-walled circular stainless steel-carbon steel bimetallic tube confined concrete slender columns under eccentric compression. 14 slender columns including bimetallic tube confined concrete (BTCC) with and without rebar, and concrete-filled bimetallic tube (CFBT) were tested. A parametric analysis is conducted based on the validated finite-element model. The results show that the two steel tube layers worked well together and the thin-walled BTCC specimens behaved in a ductile manner. Under the same parameters, the decrease of the diameter–thickness ratio of bimetallic tube improves the bearing capacity and rigidity of the BTCC slender column, but reduces its ductility in the descending stage. The confinement effect of bimetallic tube on the concrete in BTCC columns is stronger than that in CFBT columns. When the yield strength of stainless steel and carbon steel is similar, the stainless steel–total steel ratio has little effect on the capacity of the column. Provided meeting the requirements of corrosion resistance, relatively thinner stainless steel tube is preferred to reduce the cost. The comparison between the simulation and the calculation results shows that the current design method can predict the bearing capacity of the BTCC slender column with large diameter–thickness ratio.

Using Stainless Steel and Titanium Alloy in Charcot Foot Reconstruction. FEA Simulation and Clinical Case

The aim of the study was to simulate a clinical case of Charcot foot reconstruction, using finite element analysis (FEA). Our work starts from a clinical failure case of Charcot arthrodesis, were one stainless steel Midfoot Fusion Bolt (MBF) prematurely failed. Starting from CT images a 3D model of the foot was reconstructed and together with the intramedullary bolts a virtual assembly was build. In addition, a second 3D model containing 3 MBF screws and one titanium locking compression plate (LCP) was constructed. The loading conditions used in FEA were extracted based on foot biomechanics according to the gait phases. The results are showing the critical sections of the bolts and also the stress shielding effect that appears on the bolts when the plate is used as supplementary fixation element. By comparing the stress values on bolts and plate with the yield strength of stainless steel and titanium alloy that are regularly used for manufacturing these implants, a valid reconstruction solution was found. This result can help surgeons in establishing the proper bolt insertion and plate positioning for minimizing the implant failure risk.

Modeling of temperature dependent yield strength for stainless steel considering nonlinear behavior and the effect of phase transition

In this paper, a physics-based temperature dependent yield strength model for stainless steel is developed based on a kind of equivalence between the deformation energy and the heat energy. A critical yield energy which comprises the deformation energy and the corresponding heat energy is then introduced. Meanwhile, the nonlinear behavior of stainless steel before the yielding of materials and the effect of phase transition are considered in the theoretical model without any fitting parameters. These stainless steels studied in this paper are from European brands, Japanese brands and interior brands. Excellent agreement between the theoretical model predictions and the experimental results of austenitic stainless steel and ferritic stainless steel fully validates the reasonability of this model. The theoretical model is convenient and practical to predict the temperature dependent yield strength of stainless steel, which is expected to be applied for the appropriate assessment of fire resistance of stainless steel.

Static Structural Analysis of Water Tank

The paper is devoted to the static analysis water tank. Three different thicknesses of walls of the water tank are proposed and the structure is analysed in order to find appropriate stress and deformation states of structure. The maximal stress level was higher than the yield strength of stainless steel used in structure so seven different variants of stiffeners were proposed for improving stability and strength of structure.

The Research of Strengthening Mechanism on Ferritic Stainless Steel Under Impact Processing

This paper mainly studies the microstructure and strengthening mechanism of ferritic stainless under laser shock. the mechanical properties and microstructure were observed through the X-ray diffraction and TEM. The results showed that laser induced shock wave peak pressure is higher than the yield strength of stainless steel, the plastic deformation occus under the impact of the role of stress and high strain rate. when the laser power increases, ferritic stainless steel will have an obvious phase transition from the body-centered cubic into hexagonal system.