To what extent can linear finite element models of human femora predict failure under stance and fall loading configurations?

2014 ◽  
Vol 47 (14) ◽  
pp. 3531-3538 ◽  
Author(s):  
Enrico Schileo ◽  
Luca Balistreri ◽  
Lorenzo Grassi ◽  
Luca Cristofolini ◽  
Fulvia Taddei
Keyword(s):  
Finite Element ◽  
Finite Element Models ◽  
Linear Finite Element

Micro-CT-Based Large Scale Linear Finite Element Models Predict the Strength of Human Thoracic and Lumbar Vertebral Bodies

2007 ◽  
Author(s):  
Yener N. Yeni ◽  
Do-Gyoon Kim ◽  
Roger R. Zauel ◽  
Evan M. Johnson ◽  
Dianna D. Cody
Keyword(s):  
Finite Element ◽  
Large Scale ◽  
Quantitative Computed Tomography ◽  
Finite Element Models ◽  
Micro Ct ◽  
Linear Finite Element ◽  
Vertebral Strength ◽  
Local Properties ◽  
Vertebral Bodies ◽  
Architectural Detail

Vertebral fractures are among the most common and debilitating fractures. Structural organization of cancellous and cortical bone in a vertebra and their local properties are important factors that determine the strength of a vertebra. Linear finite element models utilizing Quantitative Computed Tomography (QCT) images have proven useful for predicting vertebral strength and are potentially useful in predicting risk of fracture in a clinical setting [1]. However, the amount of architectural detail in these models is not sufficient for studying trabecular stress and strains, and their relationship with the microscopic structure, which is important for understanding the mechanisms behind vertebral fragility.

Two non-linear finite element models developed for the assessment of failure of masonry arches

2008 ◽  
Vol 336 (1-2) ◽  
pp. 42-53 ◽  
Author(s):  
Michele Betti ◽  
Georgios A. Drosopoulos ◽  
Georgios E. Stavroulakis
Keyword(s):  
Finite Element ◽  
Finite Element Models ◽  
Masonry Arches ◽  
Linear Finite Element ◽  
Non Linear

Pre-overloading to Extend Fatigue Life of Cast Clasps

2007 ◽  
Vol 86 (9) ◽  
pp. 868-872 ◽  
Author(s):  
A. Mahmoud
Keyword(s):  
Finite Element ◽  
Residual Stresses ◽  
Permanent Deformation ◽  
Maximum Tensile Stress ◽  
Finite Element Models ◽  
Gold Alloys ◽  
Element Analysis ◽  
Linear Finite Element ◽  
Type Iv ◽  
Cast Condition

Permanent deformation in bending is associated with the development of residual stresses. The objective of this study was to characterize those residual stresses and test whether they can be manipulated to extend the fatigue lives of cast clasps. Simulations with validated non-linear finite element models were used to characterize the residual stresses in clasps cast from Ti-6Al-7Nb, Co-Cr, and Type IV gold alloys. In addition, two groups of as-cast and pre-overloaded (subjected to a load that produced 20 μm of permanent deformation) Ti-6Al-7Nb clasps (10 specimens each) were subjected to cyclic 0.5-mm deflections at 5 Hz until fatigue. Pre-overloaded specimens demonstrated significantly longer fatigue lives (32,200 ± 17,300 cycles) than did those tested in the as-cast condition (17,900 ± 7600 cycles), consistent with the maximum tensile stress values revealed by finite element analysis.

scholarly journals Case-specific non-linear finite element models to predict failure behavior in two functional spinal units

2018 ◽  
Vol 36 (12) ◽  
pp. 3208-3218 ◽  
Author(s):  
Karlijn H. J. Groenen ◽  
Thom Bitter ◽  
Tristia C. G. van Veluwen ◽  
Yvette M. van der Linden ◽  
Nico Verdonschot ◽  
...  
Keyword(s):  
Finite Element ◽  
Failure Behavior ◽  
Finite Element Models ◽  
Linear Finite Element ◽  
Non Linear

Numerical Modelling of the Initial Stress and Upward Deflection of Glulam Beams Pre-Stresseed by Compressed Wood

2014 ◽  
Vol 493 ◽  
pp. 408-413 ◽  
Author(s):  
Buan Anshari ◽  
Zhong Wei Guan
Keyword(s):  
Finite Element ◽  
Initial Stress ◽  
Finite Element Models ◽  
Lower Grade ◽  
Initial Stress State ◽  
New Approach ◽  
Linear Finite Element ◽  
Compressive Stresses ◽  
Upward Deflection ◽  
Compressed Wood

A new approach to reinforce glulam timber beams has been developed by using compressed wood (CW) which is made of a lower grade wood through densification processes. In the reinforcing practice, compressed wood blocks are inserted into pre-cut holes on the top of glulam beams to produce pre-camber and to generate initial tensile and compressive stresses on the top and the bottom extreme fibre of the glulam beam. In order to optimize the size, the number and the location of CW blocks, 3-D finite element models have been developed. 3D non-linear finite element models have been developed to simulate the pre-camber of Glulam beams locally reinforced by compressed wood blocks. The models developed have also produced the initial tensile and compressive stresses at the top and bottom extreme fibres with building-up moisture-dependent swelling on the CW blocks. With the pre-camber and the initial stress state that cancel out proportions of working deflection and stresses.

Unreinforced Flat Oval Duct Deformation Testing and Modeling

2020 ◽  
Author(s):  
Avinash Paruchuri ◽  
Jane Liu ◽  
Stephen Idem
Keyword(s):  
Finite Element ◽  
Wall Thickness ◽  
Galvanized Steel ◽  
Finite Element Models ◽  
Element Analysis ◽  
Linear Finite Element ◽  
Duct Wall ◽  
Model Predictions ◽  
Average Wall Thickness ◽  
Corrugated Duct

Abstract Unreinforced 12 in. × 23 in. (305 mm × 584 mm) galvanized steel flat oval ducts were tested to measure deformations when internal static gauge pressures were applied. The experiments were performed on spiral seam non-corrugated duct. Finite element models with discrete ring seams and an average wall thickness approach were utilized to represent the continuous spiral seam, and therein predict duct deflections at prescribed locations along the duct wall. Predicted deflections from the finite element models were tabulated and compared to experimental data. Satisfactory agreement between model predictions and test data were obtained from a non-linear finite element analysis that employed a simplified average wall thickness to characterize the spiral seam and duct wall. It is straightforward to implement the average wall thickness methodology in finite element modeling of duct deformation.

scholarly journals Finite element method for the static and dynamic analysis of FRP guyed tower

2018 ◽  
Vol 6 (3) ◽  
pp. 436-446 ◽  
Author(s):  
Sami Alshurafa ◽  
Hanan Alhayek ◽  
Dimos Polyzois
Keyword(s):  
Finite Element ◽  
Dynamic Analysis ◽  
Equilateral Triangle ◽  
Material Testing ◽  
Design Guidelines ◽  
Finite Element Models ◽  
Static And Dynamic Analysis ◽  
Linear Finite Element ◽  
Non Linear ◽  
Guy Wires

Abstract A research study has been carried out to provide design guidelines for glass-fiber reinforced polymer (GFRP) guyed tower. Both material testing and theoretical analysis are involved. The tower examined in this study has 81 m in height with a uniform equilateral triangle cross section having sides of 450 mm. The tower supported by seven sets of guy wires oriented at 120°, each set consisting of three guy wires. The tower was assumed to be supported at the base by means of a pinned connection to provide full moment release. The tower was analyzed using the finite element ANSYS software and was designed to satisfy both the ultimate and the serviceability limit state requirements of the CSA-S37-01 Standard. The guyed tower was analyzed in static to evaluate the tower strength failure using several advanced failure theories. Modal analysis and full dynamic analysis using CSA-37-01 Standard were extensively performed to evaluate the vibration performance and to obtain an accurate dynamic response of the full-scale tower. The paper presents the results obtained from material testing and from a finite element, ANSYS models developed for the static and dynamic analysis of the multi-cells 81 m lightweight-guyed towers. Highlights The research = involved the analysis and the design of FRP guyed tower composed of individual cells fabricated from fiberglass matting bonded together to form an equilateral triangle. The layout, the dimensions of the tower and the thickness of the cell walls were determined from a finite element analysis. Fifteen coupons were fabricated and tested based on ASTM standards to evaluate the mechanical properties of the GFRP material. Several non-linear finite element models were developed to meet both the manufacturing constraints and strength requirements. Several non-linear finite element models were carried out for the static and dynamic analysis of an 81 m tower.

Sign in / Sign up

Export Citation Format

Share Document