scholarly journals e EXPERIMENTAL & NUMERICAL STUDY OF BUCKLING BEHAVIOR FOR STAINLESS STEEL 304 ALLOY COLUMNS UNDER DYNAMIC LOADS

2019 ◽  
Vol 19 (4) ◽  
pp. 369-380
Author(s):  
Hussain Jasim AL Akawai ◽  
Khalid Mershid Aweed ◽  
Shawthab Ali Jaber
Keyword(s):  
Stainless Steel ◽  
Numerical Study ◽  
Compressive Load ◽  
Dynamic Loads ◽  
304 Stainless Steel ◽  
Column Length ◽  
Buckling Behavior ◽  
Stainless Steel 304 ◽  
Fixed End ◽  
The Mathematical Model

    In the present research the effect of corrosion on buckling behavior of 304 stainless steel with increasing of compressive dynamic loads was studied. There are long types of the columns were used. For compression test, there are 24 columns specimens were used in the dynamic axis, 12 columns tests were carried out with increasing in the dynamic axis of compressive load, while for the corrosion test was performed by using 12 specimens were buried for two months under the ground before tested them. The digital gauge was employed at the distance about 0.7 for the column length at the fixed end of column. has alarm system was used to define critical buckling and to avoid the failure of the specimen and installed at the distance equal to 0.7 of the column length from fixed end. The empirical results showed that the effect of negatively corrosion on mechanical properties of alloys with 2.53% reduction of ultimate tensile strength comparing with non-corroded specimens, in the other hand the corrosion will reduce the critical buckling load by 6% for two months. The experimental results comparing with the standard theories of the buckling behavior and with the finite element (ANSYS)  results to verify the mathematical model.

scholarly journals Finite Element Method Analysis of Normal and Corrosion Buckling with ANSYS17 Program for Stainless Steel 304 Alloy

2018 ◽  
Vol 7 (4.7) ◽  
pp. 245
Author(s):  
Hussain Jasim AL Akawai ◽  
Khalid Mershid Aweed ◽  
Shawthab Ali Jaber
Keyword(s):  
Stainless Steel ◽  
Safety Factor ◽  
Compressive Load ◽  
304 Stainless Steel ◽  
Column Length ◽  
Buckling Behavior ◽  
Stainless Steel 304 ◽  
Fixed End ◽  
Method Analysis ◽  
Lateral Axis

In the present research the effect of corrosion on buckling behavior of 304 stainless steel with increasing of compressive dynamic loads was studied. There are two types of the columns, long columns and intermediate columns were used. For compression test, there are 24 columns specimens were used in the dynamic axis, 12 columns tests were carried out with increasing in the dynamic axis of compressive load, while for the corrosion test was performed by using 12 specimens were buried for two months under the ground before tested them. The allowable deflection in lateral axis is 1% in the length of column. When the deflection in lateral axis reaches 1% and does not increase more than it, and when removing the applied load, the column will return back to the normal state. This is defined critical buckling of columns. To calculate the original deflection. The digital gauge was employed at the distance about 0.7 for the column length at the fixed end of column. has alarm system was used to define critical buckling and to avoid the failure of the specimen and installed at the distance equal to 0.7 of the column length from fixed end. The empirical results showed that the effect of negatively corrosion on mechanical properties of alloys with 2.53% reduction of ultimate tensile strength comparing with non corroded specimens, in the other hand the corrosion will reduce the critical buckling load by 6% for two months. The experimental results comparing with the theoretical results obtained by Perry Robertson and Euler. Johnson with the results analyzed by ANASYS17. The results of this work are agreed with Perry-Robertson and Euler- Johnson by a safety factor about (1, 3) and 3 respectively while the results of ANASYS showed that agreement with the calculated and measured values by safety factor about (2).  

Friction Coefficient and Wear Rate of Different Materials Sliding Against Stainless Steel

2013 ◽  
Vol 1 (1) ◽  
pp. 33-45 ◽  
Author(s):  
Dewan Muhammad Nuruzzaman ◽  
Mohammad Asaduzzaman Chowdhury
Keyword(s):  
Stainless Steel ◽  
Friction Coefficient ◽  
Wear Rate ◽  
Normal Load ◽  
304 Stainless Steel ◽  
Sliding Velocity ◽  
Stainless Steel 304 ◽  
Different Types ◽  
Pin On Disc ◽  
Ss 304

This paper examines the relation between friction/wear and different types of steel materials under different normal loads and sliding velocities and to explore the possibility of adding controlled normal load and sliding velocity to a mechanical process. In order to do so, a pin on disc apparatus is designed and fabricated. Experiments are carried out when different types of disc materials such as stainless steel 304 (SS 304), stainless steel 316 (SS 316) and mild steel slide against stainless steel 304 (SS 304) pin. Variations of friction coefficient with the duration of rubbing at different normal loads and sliding velocities are investigated. Results show that friction coefficient varies with duration of rubbing, normal load and sliding velocity. In general, friction coefficient increases for a certain duration of rubbing and after that it remains constant for the rest of the experimental time. The obtained results reveal that friction coefficient decreases with the increase in normal load for all the tested materials. It is also found that friction coefficient increases with the increase in sliding velocity for all the materials investigated. Moreover, wear rate increases with the increase in normal load and sliding velocity. At identical operating condition, the magnitudes of friction coefficient and wear rate are different for different materials depending on sliding velocity and normal load.

scholarly journals Experimental and Numerical Investigations on Microcoining of Stainless Steel 304

2008 ◽  
Vol 130 (4) ◽  
Author(s):  
Gap-Yong Kim ◽  
Muammer Koç ◽  
Jun Ni
Keyword(s):  
Grain Size ◽  
Stainless Steel ◽  
Bulk Material ◽  
High Strength ◽  
304 Stainless Steel ◽  
Feature Size ◽  
Stainless Steel 304 ◽  
Metallic Parts ◽  
Type 304 ◽  
Type 304 Stainless Steel

Increasing demands for miniature metallic parts have driven the application of microforming in various industries. Only a limited amount of research is, however, available on the forming of miniature features in high strength materials. This study investigated the forming of microfeatures in Type 304 stainless steel by using the coining process. Experimental work was performed to study the effects of workpiece thickness, preform shape, grain size, and feature size on the formation of features ranging from 320μmto800μm. It was found that certain preform shapes enhance feature formation by allowing a favorable flow of the bulk material. In addition, a flow stress model for Type 304 stainless steel that took into consideration the effects of the grain and feature sizes was developed to accurately model and better understand the coining process. Weakening of the material, as the grain size increased at the miniature scale, was explained by the Hall–Petch relationship and the feature size effect.

scholarly journals A Numerical Study of Slip System Evolution in Ultra-Thin Stainless Steel Foil

Materials ◽  
2019 ◽  
Vol 12 (11) ◽  
pp. 1819 ◽  
Author(s):  
Zhongkai Ren ◽  
Wanwan Fan ◽  
Jie Hou ◽  
Tao Wang
Keyword(s):  
Stainless Steel ◽  
Slip System ◽  
Numerical Study ◽  
Three Dimensional ◽  
304 Stainless Steel ◽  
Slip Systems ◽  
Deformation Degree ◽  
Engineering Strain ◽  
Stainless Steel Foil ◽  
Grain Orientations

In order to quantitatively describe the effect of the initial grain orientation on the inhomogeneous deformation of 304 austenitic stainless steel foil during tension, a three-dimensional uniaxial tension model was established, based on the crystal plasticity finite element method (CPFEM) and Voronoi polyhedron theory. A three-dimensional representative volume element (RVE) was used to simulate the slip deformation of 304 stainless steel foil with five typical grain orientations under the same engineering strain. The simulation results show that the number and characteristics of active slip systems and the deformation degree of the grain are different due to the different initial grain orientations. The slip systems preferentially initiate at grain boundaries and cause slip system activity at the interior and free surface of the grain. The Brass, S, and Copper oriented 304 stainless steel foil exhibits a high strain hardening index, which is beneficial to strengthening. However, the Cube and Goss oriented 304 stainless steel foil has a low deformation resistance and is prone to plastic deformation.

A Comparison of Grain Boundary Character Distributions between Grain Boundary Engineered Austenitic Stainless Steel and Pb-Ca Based Alloy

2013 ◽  
Vol 753 ◽  
pp. 83-86
Author(s):  
Wei Guo Wang ◽  
Xiao Ying Fang ◽  
Hong Guo
Keyword(s):  
Stainless Steel ◽  
Austenitic Stainless Steel ◽  
Grain Boundary ◽  
304 Stainless Steel ◽  
Orientation Relationships ◽  
Boundary Character ◽  
Grain Boundary Character ◽  
Stainless Steel 304 ◽  
Grain Orientations ◽  
Austenitic Stainless Steel 304

Though there developed same concentrations of special grain boundaries (SBs) in grain boundary engineered (GBE) austenitic stainless steel (304 stainless steel) and a Pb-Ca based alloy, the makeup of SBs, size distribution of clusters of grains with ∑3n (n=1,2,3) orientation relationships (∑3n CG), and grain orientations (textures) are quite different between the two specimens, suggesting there have two different mechanisms separately governing the evolution of grain boundary character distributions (GBCDs) in the two types of materials during GBE processing.

scholarly journals Atomistic Investigation on Diffusion Welding between Stainless Steel and Pure Ni Based on Molecular Dynamics Simulation

Materials ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 1957 ◽  
Author(s):  
Yanqiu Zhang ◽  
Shuyong Jiang
Keyword(s):  
Molecular Dynamics ◽  
Stainless Steel ◽  
Md Simulation ◽  
Pressure Effect ◽  
Dynamics Simulation ◽  
304 Stainless Steel ◽  
Diffusion Welding ◽  
Interface Diffusion ◽  
Stainless Steel 304 ◽  
Diffusion Behaviors

Based on molecular dynamics (MD) simulation, the behaviors and mechanisms of diffusion welding between 304 stainless steel (304 SS) and pure Ni were investigated in the present study. The results show that surface roughness has a significant influence on the diffusion behaviors of atoms during diffusion welding between two different materials, and it is suggested that the rough surface should be set on the pure Ni rather than the 304 SS during the diffusion welding between them. Temperature plays an important role in the interface diffusion. With the increase of temperature, the number of atoms diffusing into the opposite side increases and the diffusion distances increase as well. As a consequence, the diffusion welding should be performed at a suitably elevated temperature. The influence of vertical pressure on the diffusion bonding between the two materials includes two aspects. One is to increase the contact area via deforming the asperities or grooves at the interface, which provides more opportunities for the diffusion between the two materials. The other is to reduce the mobility of atoms within a lattice. As a consequence, the pressure effect is smaller than temperature effect during diffusion welding between 304 SS and pure Ni.

NANO HYDROXYAPATITE COATING ON STAINLESS STEEL 304 BY ELECTROCHEMICAL METHOD

2008 ◽  
Vol 22 (18n19) ◽  
pp. 3092-3098
Author(s):  
M. SAREMI ◽  
F. HAGHIGHAT SABET
Keyword(s):  
Stainless Steel ◽  
Calcium Phosphates ◽  
304 Stainless Steel ◽  
Operating Voltage ◽  
Polarization Method ◽  
Sem Images ◽  
Cathodic Electrodeposition ◽  
Ha Coating ◽  
Stainless Steel 304 ◽  
And Diffusion

Hydroxyapatite and other calcium phosphates are the most important mineral parts of human bone. HA is applied on 304 stainless steel using cathodic electrodeposition in an electrolyte consisting of Ca ( NO 3)2 and NH 4 H 2 PO 4. The effect of electrodeposition parameters such as voltage, temperature and current density on the morphology and adhesion of the deposits were examined. Needle-like structure with nano width was obtained at 80°C and 2V while higher operating voltage resulted in flake type and coarse needle-like deposits. In fact, the lower voltage can change the electronation and diffusion of acting species. The adhesion of the coating, examined by tape test, improved by this method. TEM and SEM images showed the needle-like structure with nanometric width which is very similar to structure of natural bone. Corrosion resistance of the deposits was checked using polarization method and confirmed better performance of the nano HA coating.

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