scholarly journals Flow Stress and Phase Transformation Analyses in Austenitic Stainless Steel Under Cold Working : Part 2, Incremental Theory Under Multiaxial Stress State by the Finite-Element Method

1993 ◽  
Vol 36 (1) ◽  
pp. 63-72 ◽  
Author(s):  
Toshio Tsuta ◽  
Jorge Cortes R. A.
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Stainless Steel ◽  
Phase Transformation ◽  
Flow Stress ◽  
Stress State ◽  
Austenitic Stainless Steel ◽  
Cold Working ◽  
The Finite Element Method ◽  
Multiaxial Stress State

Stress analysis for a lug under various conditions

1994 ◽  
Vol 29 (1) ◽  
pp. 7-16 ◽  
Author(s):  
G S Wang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Stress State ◽  
Stress Analysis ◽  
Cold Working ◽  
Contact Condition ◽  
The Finite Element Method ◽  
Element Method ◽  
Stress Analyses

Stress analyses are performed using the finite element method (FE) for a lug under various conditions. The effects of the clearance between pin and hole, the pin load magnitude, the contact condition, and the relative pin/lug rigidities etc. are investigated. The effect of some durability improvement techniques, such as interference fitting, bushing, and cold working are also investigated. Significant results are obtained which can improve both the understanding of the stress state in a lug and the design of a durable lug.

scholarly journals Comparative Evaluation of the Force and Load Deflection Rate for Different Loop Springs with Varying Designs, Wire Dimensions, and Materials: A Finite Element Method Study

2019 ◽  
Vol 53 (3) ◽  
pp. 189-196
Author(s):  
Bhagyashree S. Jadhav ◽  
Ravindranath V. Krishnan ◽  
Vivek J. Patni ◽  
Girish R. Karandikar ◽  
Anita G. Karandikar ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Stainless Steel ◽  
Anterior Segment ◽  
Computer Assisted ◽  
The Finite Element Method ◽  
Computer Assisted Design ◽  
Beta Titanium ◽  
Deflection Rate ◽  
Element Method

Objective: To evaluate and compare the force and load deflection rate generated by differing unit displacement through 1 to 4 mm of springs that vary in design (Double Delta Closing Loop, Double Vertical T Crossed Closing Loop, Double Vertical Helical Closing Loop and Ricketts Maxillary Retractor), constituting wire materials (stainless steel and beta titanium), and wire dimensions (0.017" × 0.025" and 0.019" × 0.025"). Materials and methods: Computer-assisted design (CAD) model of the said loop springs was created and converted to the finite element method (FEM). The boundary conditions assigned were restraining anterior segment of the loops in all the 3 axes and displacement of the posterior segment progressively only along the x-axis in increments of 1, 2, 3, and 4 mm. Force and load deflection rate were calculated for each incremental displacement. Results: For all loop designs, force and load deflection rate increased with incremental displacement. Loop springs of beta titanium and 0.017" × 0.025" dimension showed lesser force and load deflection rate than those of stainless steel and 0.019" × 0.025", respectively. Ricketts Maxillary Retractor showed the least force and load deflection rate. Comparable force and load deflection values were found for 0.017" × 0.025" Double Vertical T Crossed Loop and 0.019" × 0.025" Double Vertical Helical Closing Loop. Conclusions: Variations in wire dimensions, materials, and designs have a profound effect on force and load deflection rate of the different loop springs studied.

Experimental Study of Ratcheting for SUS304 Stainless Steel and A1070 Aluminum Alloy

2007 ◽  
Author(s):  
Masao Sakane ◽  
Akihiko Inoue ◽  
Xu Chen ◽  
Kwang Soo Kim
Keyword(s):  
Experimental Study ◽  
Stainless Steel ◽  
Aluminum Alloy ◽  
Stress State ◽  
Austenitic Stainless Steel ◽  
Pure Aluminum ◽  
Stress Strain ◽  
Multiaxial Stress State ◽  
Ratcheting Strain ◽  
Additional Hardening

This paper studies the cyclic ratcheting for two materials under multiaxial stress state. The two materials are SUS304 austenitic stainless steel and A1070 pure aluminum. The former material is known as a material that gives strong additional hardening and the latter material shows little additional hardening under nonproportional cyclic loading. The ratcheting behavior under 12 stress-strain waveforms was extensively studied using hollow cylinder specimen. Ratcheting strain depended on the material and stress-strain waveform. Anisotropic ratcheting was found in A1070 but isotropic ratcheting was observed in SUS304 steel.

scholarly journals УЗАГАЛЬНЕННЯ МОДЕЛІ ФОЛЬКЕРСЕНА НА ВИПАДОК ОСЬОВОЇ СИМЕТРІЇ

2021 ◽  
pp. 78-89
Author(s):  
К. П. Барахов
Keyword(s):  
Mathematical Model ◽  
Finite Element Method ◽  
Finite Element ◽  
Stress State ◽  
Boundary Conditions ◽  
Classical Model ◽  
The Finite Element Method ◽  
Premature Failure ◽  
One Dimensional ◽  
Element Method

Thin-walled structures may contain defects as cracks and holes that are leftovers of the material the construction, is made of or they occur during the operation as a result of, for example, mechanical damage. The presence of holes in the plate causes a concentration of stresses at the boundary of the holes and ultimately leads to premature failure of the structural element. Repair of local damage of modern aircraft structures can be made by creating overlays that are glued to the main structure. The overlay takes on part of the load, unloading the damaged area. This method of repair provides tightness and aerodynamic efficiency to the structure. The calculation of the stress state of such glued structures is usually performed by using the finite element method. The classic models of the stress state of overlapped joints are one-dimensional. That is, the change of the stress state along only one coordinate is considered. At the same time, the connections of a rectangular form are also considered. The purpose of this work is to create a mathematical model of the stress state of circular axisymmetric adhesive joints and to build an appropriate analytical solution to the problem. It is assumed that the bending of the plates is absent; the deformation of the plates is even by thickness. The adhesive layer works only on the shift. The main plate and the overlay are considered isotropic. The solution is built on polar coordinates. The stress state of the connection depends only on the radial coordinate, i.e. one-dimensional. The solution is obtained in analytical form. This mathematical model is a generalization of the classical model of the adhesive connection of Volkersen to a circular or annular region and is considered for the first time. Boundary conditions are met exactly. The satisfaction of marginal conditions, as well as boundary conditions, leads to a system of linear equations with respect to the unknown coefficients of the obtained solutions. The model problem is solved and the numerical results are compared with the results of calculations performed by using the finite element method. It is shown that the proposed model has sufficient accuracy for engineering problems and can be used to solve problems of the design of aerospace structures.

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