Calculation of the Wöhler (S-N) Curve Using a Two-Scale Model

2022 ◽  
pp. 16-36
Author(s):  
M. Mlikota
Keyword(s):  
Finite Element Method ◽  
Stress Distribution ◽  
Scale Model ◽  
Micro Model ◽  
The Finite Element Method ◽  
Paris Law ◽  
Physically Based ◽  
Microstructural Model ◽  
Number Of Cycles ◽  
Microstructure Of The Material

This chapter deals with the initiation of a short crack and subsequent growth of the long crack in a carbon steel under cyclic loading, concluded with the estimation of the complete lifetime represented by the Wöhler (S-N) curve. A micro-model containing the microstructure of the material is generated using the Finite Element Method and the according non-uniform stress distribution is calculated afterwards. The number of cycles needed for crack initiation is estimated on the basis of the stress distribution in the microstructural model and by applying the physically-based Tanaka-Mura model. The long crack growth is handled using the Paris law. The analysis yields good agreement with experimental results from literature.

Estimation of the Total Fatigue Life of Metallic Structures

2016 ◽  
Author(s):  
Peter Abdo ◽  
Farouk Fardoun ◽  
Phuoc Huynh
Keyword(s):  
Finite Element Method ◽  
Fatigue Life ◽  
Analytical Methods ◽  
Critical Section ◽  
The Finite Element Method ◽  
Local Conditions ◽  
Metallic Structures ◽  
Final Failure ◽  
Local Stresses ◽  
Number Of Cycles

The fatigue life of a component is defined as the total number of cycles or time to induce fatigue damage and to initiate a dominant fatigue flaw which is propagated to final failure.(Shigley & Mischke 2002) The aim of this project is to calculate the total fatigue life of metallic structures under cyclic loading by applying equations found by Basquin and Manson-Coffin. The local stresses and strains necessary for the calculation are determined by the finite element method. Former studies concerning this subject have used analytical methods to find the local conditions at the critical section. The analytical methods, based on Neuber and Molski-Glinka’s approaches, permit the calculation of the local stresses and strains at the critical section of the structure’s geometry as a function of the nominal stress (forces) applied. For the finite elements method, ABAQUS is used to determine the local conditions at the critical section of a T-shaped model.

Improvements for a Hydraulic Excavator's Boom

2014 ◽  
Vol 490-491 ◽  
pp. 510-513
Author(s):  
Sheng Bin Wu ◽  
Xiao Bao Liu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Stress Concentration ◽  
Stress Distribution ◽  
High Stress ◽  
The Finite Element Method ◽  
Element Method ◽  
Concentration Phenomenon

Focus on stress concentration and high stress area, four improvements were put forward through analyzed a hydraulic excavator's boom with the finite element method under the bucket digging condition. Compared the stress distribution graph, the results show that these schemes can improve the stress concentration phenomenon and the high stress distribution areas. The practices demonstrated the effectiveness to reduce the invalidation rate of hydraulic excavator's boom.

Performances of HSK Spindle/Toolholder Interface for HSM

2006 ◽  
Vol 532-533 ◽  
pp. 269-272
Author(s):  
Song Zhang ◽  
Xing Ai ◽  
Jian Feng Li ◽  
Xiu Li Fu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Stress Distribution ◽  
Contact Stress ◽  
High Speed ◽  
Rapid Development ◽  
High Speed Machining ◽  
The Finite Element Method ◽  
Axial Movement ◽  
Contact Stress Distribution

With the rapid development of high-speed machining technology, more and more machining centers have been equipped with the HSK toolholders. In this paper, the performances of the HSK spindle/toolholder interface, such as the axial movement, the radial deflection and the contact stress distribution, were simulated by means of the finite element method and compared with the traditional BT interface. From the simulated results, it was pointed out that the performances of the HSK interface were obviously superior to that of the BT interface, and the HSK interface was much more suitable for high-speed machining.

Modified Coronal Incision: Distribution of Stress in the Scalp and Cranium

1993 ◽  
Vol 30 (4) ◽  
pp. 382-386
Author(s):  
Sadanori Akita ◽  
Akiyoshi Hirano
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Stress Distribution ◽  
Fem Analysis ◽  
Craniofacial Surgery ◽  
The Finite Element Method ◽  
Modified Method ◽  
Distribution Of Stress ◽  
Scalp Incision ◽  
Coronal Incision

Coronal incision or bitemporal incision is useful for wider visualization in craniofacial surgery. In volume-expanding surgery such as fronto-orbital advancement, however, the incisional scar in the temporal scalp is often undesirably wide and conspicuous. We modified the coronal incision to avoid the widened scar. Further, we analyzed the resulting stress distribution using the finite element method (FEM) to determine whether or not the modification we adapted was effective. The modified method of coronal scalp incision that we used for craniofacial surgery is practical and technically easy. FEM analysis showed that our method was effective in terms of mechanical strength. The simulated surgical craft model is presented and is concluded to be beneficial for further analysis in craniofacial surgery.

Effect of Surface Topography on Stress Distribution of Vacuum Plate Glass for Different Aluminum Alloy Braced Pillars

2009 ◽  
Vol 407-408 ◽  
pp. 705-709 ◽  
Author(s):  
Hong Miao ◽  
Dun Wen Zuo ◽  
Rui Hong Zhang ◽  
Jian Feng Zhang
Keyword(s):  
Finite Element Method ◽  
Aluminum Alloy ◽  
Stress Distribution ◽  
Surface Topography ◽  
Strain Field ◽  
Maximum Stress ◽  
Plate Glass ◽  
The Finite Element Method ◽  
Glass Quality ◽  
Effect Of Surface

: The effect of different surface topography on stress distribution of vacuum plate glass for the aluminum alloy braced pillars was analyzed by electrometric method. The results show that the maximum stress exists at the interfaces of all experimental glasses sheet and the top and bottom sides of a brace. The conclusion that the size of contact area between braced pillar and glass has an impact on stress distribution of the glass is obtained. The stress-strain field of different vacuum plate glasses was analyzed by the finite element method. The stress distribution of their important sides was obtained such as sealing side, supporting side and braced pillar. The experimental results are shown that high precision of the brace height and good flatness of the glass sheet considerably improve vacuum plate glass quality，such as its strength，its dependability and service life.

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