Stress Reduction in Adjacent Level Discs via Dynamic Instrumentation: A Finite Element Analysis

SAS Journal ◽  
2007 ◽  
Vol 1 (2) ◽  
pp. 74-81 ◽  
Author(s):  
Antonio E. Castellvi ◽  
Hao Huang ◽  
Tov Vestgaarden ◽  
Sunil Saigal ◽  
Deborah H. Clabeaux ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Reduction ◽  
Adjacent Level ◽  
Element Analysis ◽  
Dynamic Instrumentation

scholarly journals Stress Reduction in Adjacent Level Discs via Dynamic Instrumentation: A Finite Element Analysis

2007 ◽  
Vol 1 (2) ◽  
pp. 74-81 ◽  
Author(s):  
Antonio E. Castellvi ◽  
Hao Huang ◽  
Tov Vestgaarden ◽  
Sunil Saigal ◽  
Deborah H. Clabeaux ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Reduction ◽  
Adjacent Level ◽  
Element Analysis ◽  
Dynamic Instrumentation

Residual Stresses and Their Redistribution During Annealing of a Girth-Butt Welded Thin-Walled Pipe

1982 ◽  
Vol 104 (3) ◽  
pp. 245-250 ◽  
Author(s):  
B. L. Josefson
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Reduction ◽  
Rotational Symmetry ◽  
Manganese Steel ◽  
Heating Period ◽  
Element Analysis ◽  
Thin Walled Pipe ◽  
Thin Walled ◽  
Holding Temperature

The redistribution of calculated welding stresses during different post weld heat treatments (PWHT) is numerically investigated for a girth-butt welded thin-walled pipe made of a micro-alloyed carbon manganese steel. A finite element analysis with assumed rotational symmetry is performed. The influence of creep, relaxation and phase transformations is included. The amount of stress reduction is found to be mainly controlled by the holding temperature. Most of this reduction was observed to occur during the end of the heating period where the transient stresses followed the fall of the yield stress with temperature.

scholarly journals Comparison of Platform Switched and Sloping Shoulder Implants on Stress Reduction in various Bone Densities: Finite Element Analysis

2017 ◽  
Vol 18 (6) ◽  
pp. 510-515 ◽  
Author(s):  
S Suresh ◽  
Joji Markose ◽  
Shruthi Eshwar ◽  
K Rekha ◽  
Vipin Jain
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Distribution ◽  
Stress Reduction ◽  
Bone Growth ◽  
Compact Bone ◽  
Distribution Model ◽  
Implant Design ◽  
Element Analysis ◽  
Vertical Loading

ABSTRACT Introduction Comparison of platform switched (PS), sloping shoulder, and regular implants on stress reduction in various bone densities with finite element analysis. Materials and methods A total of 12 three-dimensional finite element models were built to analyze the stress distribution model. Nobel Biocare 4.3 × 8 mm regular platform replace select implant with matching diameter easy abutment, Nobel Biocare 4.3 × 8 mm replace select implant PS with 3.5 mm diameter easy abutment, Bicon 4 × 8 mm implant with 4 mm diameter sloping shoulder abutments were created virtually in compact bone density using software. The 130 N axial force and a 90 N oblique loading force were applied to the abutment to analyze the stress. Results Under horizontal and vertical loading, the sloping shoulder implant had lesser stresses in cancellous bone when compared with PS and regular implants. Sloping shoulder implant showed more stress distribution at implant–abutment interface and at crestal area, whereas with regular implants, the stresses were distributed at cortical area. Conclusion Sloping shoulder implant in subcrestal position is much favorable for bone growth, stress distribution, and preservation of remaining bone. Clinical significance Use of sloping shoulder implant design distributes the stress apically and creates lesser stresses when compared with PS implants. How to cite this article Markose J, Suresh S, Eshwar S, Rekha K, Jain V, Manvi S. Comparison of Platform Switched and Sloping Shoulder Implants on Stress Reduction in various Bone Densities: Finite Element Analysis. J Contemp Dent Pract 2017;18(6):510-515.

scholarly journals Design optimization of precision casting for residual stress reduction

2015 ◽  
Vol 3 (2) ◽  
pp. 140-150 ◽  
Author(s):  
Appasaheb Adappa Keste ◽  
Shravan Haribhau Gawande ◽  
Chandrani Sarkar
Keyword(s):  
Residual Stress ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Residual Stresses ◽  
Design Optimization ◽  
Stress Reduction ◽  
Casting Process ◽  
Actual Behavior ◽  
Element Analysis ◽  
Cast Part

Abstract Normally all manufacturing and fabrication processes introduce residual stresses in a component. These stresses exist even after all service or external loads have been removed. Residual stresses have been studied elaborately in the past and even in depth research have been done to determine their magnitude and distribution during different manufacturing processes. But very few works have dealt with the study of residual stresses formation during the casting process. Even though these stresses are less in magnitude, they still result in crack formation and subsequent failure in later phases of the component usage. In this work, the residual stresses developed in a shifter during casting process are first determined by finite element analysis using ANSYS® Mechanical APDL, Release 12.0 software. Initially the analysis was done on a simple block to determine the optimum element size and boundary conditions. With these values, the actual shifter component was analyzed. All these simulations are done in an uncoupled thermal and structural environment. The results showed the areas of maximum residual stress. This was followed by the geometrical optimization of the cast part for minimum residual stresses. The resulting shape gave lesser and more evenly distributed residual stresses. Crack compliance method was used to experimentally determine the residual stresses in the modified cast part. The results obtained from the measurements are verified by finite element analysis findings. Highlights This paper focus on analytical, numerical and experimental design optimization of shifter. Performed design optimization by finite element analysis and experimental of live industrial problem. The results can applicable as a basis of design and optimization of new type of the automotive parts. The results of the current work present the actual behavior of induced stresses.

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