Development of a Lower Extremity Model for Finite Element Analysis at Blast Condition

2011 ◽  
Author(s):  
Robbin Bertucci ◽  
Jun Liao ◽  
Lakiesha Williams
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Shock Waves ◽  
Lower Extremity ◽  
Direct Contact ◽  
Computational Analysis ◽  
Experimental Studies ◽  
Lower Extremities ◽  
Element Analysis ◽  
Made In

Explosions are the leading cause of death on the battlefield [1]. These explosives generate shock waves which stimulate large accelerations and deformations. The resulting loads pose serious threats to military and civilians. Since lower extremities are in direct contact with the ground, the lower extremities are commonly injured during explosions [2]. These injuries could be seriously fatal. Although experimental studies have been performed to advance these understandings [2], limited progress has been made in computational analysis of shock waves on the lower extremity.

Validation of Finite Element Lower Extremity Model Using Drop Tower Testing

2013 ◽  
Author(s):  
Robbin Bertucci ◽  
R. Prabhu ◽  
M. F. Horstemeyer ◽  
James Sheng ◽  
Jun Liao ◽  
...  
Keyword(s):  
Finite Element ◽  
Shock Waves ◽  
Lower Extremity ◽  
Cause Of Death ◽  
Direct Contact ◽  
Computational Analysis ◽  
Experimental Studies ◽  
Lower Extremities ◽  
Drop Tower ◽  
Made In

Explosions are the leading cause of death on the battlefield [1]. These explosives, such as bombs and mines, generate shock waves which stimulate large accelerations and deformations. The resulting loads pose serious threats to military and civilians if not sufficiently evaluated and protected. The use of anti-vehicle landmines has become extremely common. Due to lower extremities being in direct contact with the floor of vehicles, the lower extremities are commonly injured during explosions [2]. These injuries can be seriously fatal. Although experimental studies have been performed to advance these understandings [2], limited progress has been made in computational analysis of shock waves on the lower extremity.

Strength-based design of a sunflower stalk cutter machine design using finite element analysis and experimental validation

2021 ◽  
pp. 095440622110597
Author(s):  
Gürkan İrsel
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Analysis ◽  
Strain Gage ◽  
Experimental Validation ◽  
Experimental Studies ◽  
Fatigue Analysis ◽  
Structural Stress ◽  
Element Analysis ◽  
Strength Based

In this study, the total algorithm of the strength-based design of the system for mass production has been developed. The proposed algorithm, which includes numerical, analytical, and experimental studies, was implemented through a case study on the strength-based structural design and fatigue analysis of a tractor-mounted sunflower stalk cutting machine (SSCM). The proposed algorithm consists of a systematic engineering approach, material selection and testing, design of the mass criteria suitability, structural stress analysis, computer-aided engineering (CAE), prototype production, experimental validation studies, fatigue calculation based on an FE model and experimental studies (CAE-based fatigue analysis), and an optimization process aimed at minimum weight. Approximately 85% of the system was designed using standard commercially available cross-section beams and elements using the proposed algorithm. The prototype was produced, and an HBM data acquisition system was used to collect the strain gage output. The prototype produced was successful in terms of functionality. Two- and three-dimensional mixed models were used in the structural analysis solution. The structural stress analysis and experimental results with a strain gage were 94.48% compatible in this study. It was determined using nCode DesignLife software that fatigue damage did not occur in the system using the finite element analysis (FEA) and experimental data. The SSCM design adopted a multi-objective genetic algorithm (MOGA) methodology for optimization with ANSYS. With the optimization solved from 422 iterations, a maximum stress value of 57.65 MPa was determined, and a 97.72 kg material was saved compared to the prototype. This study provides a useful methodology for experimental and advanced CAE techniques, especially for further study on complex stress, strain, and fatigue analysis of new systematic designs desired to have an optimum weight to strength ratio.

Experimental studies and finite-element analysis of the seismicity of north china plain

1982 ◽  
Vol 85 (1-2) ◽  
pp. 75-89 ◽  
Author(s):  
Huanyen Loo ◽  
Huizhen Song ◽  
Caihua Guo ◽  
Jianguo Li
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
North China Plain ◽  
North China ◽  
Experimental Studies ◽  
Element Analysis

Finite Element Analysis of Engine Bore Distortions During Boring Operation

1993 ◽  
Vol 115 (4) ◽  
pp. 379-384 ◽  
Author(s):  
N. N. Kakade ◽  
J. G. Chow
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Piston Ring ◽  
Experimental Studies ◽  
Temperature Gradients ◽  
Element Analysis ◽  
Temperature Changes ◽  
Simulation Procedure ◽  
Finite Element Package ◽  
Element Technique

Bore geometry is the major factor affecting oil comsumption, piston ring wear, and frictional losses in an engine. As such, auto industries have been constantly striving to develop better machining technologies to produce engine bores with greater precision. Experimental studies have shown that the bore distortion as a result of machining is mainly caused by temperatures and stresses created during cutting. Consequently, optimization of machining conditions so as to minimize both bore temperature gradients as well as mechanical stresses while machining should lead to the production of better bore geometry. This research develops a model aimed at simulating bore distortions caused by temperature changes and stresses generated during machining using finite element technique. The commercial finite element package ANSYS has been used along with the CAD package I-DEAS to simulate the boring process on DEC-VAX computers. The simulation procedure developed can be used to obtain a better understanding of the boring process, in particular, to determine distortion trends for different cutting conditions.

ANALYTICAL AND EXPERIMENTAL STUDIES ON 400 kV S/C PORTAL-TYPE GUYED TOWERS

2009 ◽  
Vol 09 (01) ◽  
pp. 85-106
Author(s):  
N. PRASAD RAO ◽  
S. J. MOHAN ◽  
R. P. ROKADE ◽  
R. BALA GOPAL
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Experimental Studies ◽  
Ground Level ◽  
Test Results ◽  
Element Analysis ◽  
Finite Element Software ◽  
The Finite Element Analysis ◽  
Guyed Towers ◽  
Analytical Behavior

The experimental and analytical behavior of 400 kV S/C portal-type guyed towers under different loading conditions is presented. The portal-type tower essentially consists of two masts extending outward in the transverse direction from the beam level to the ground. In addition, two sets of guys connected at the ground level project outward along the longitudinal axes and converge in the transverse axes. The experimental behavior of the guyed tower is compared with the results of finite element analysis. The 400 kV portal-type guyed towers with III and IVI type insulator strings are analyzed using finite element software. Full scale tower test results are verified through comparison with the results of the finite element analysis. The initial prestress in the guys is allowed to vary from 5% to 15% in the finite element modeling. The effect of prestress variation of the guys on the tower behavior is also studied.

3-D Non-Linear Finite Element Analysis of a Non-Gasketed Flange Joint Under Combined Internal Pressure and Axial Loading

2007 ◽  
Author(s):  
Muhammad Abid ◽  
Abdul W. Awan
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Internal Pressure ◽  
Structural Integrity ◽  
Experimental Studies ◽  
Axial Loading ◽  
External Loading ◽  
Flange Joint ◽  
Element Analysis ◽  
Bolted Flange

A number of analytical and experimental studies have been conducted to study ‘strength’ and ‘sealing capability’ of bolted flange joint only under internal pressure loading. Due to the ignorance of the external i.e. axial loading, the optimized performance of the bolted flange joint can not be achieved. A very limited work is found in literature under combined internal pressure and axial loading. In addition, the present design codes do not address the effects of axial loading on the structural integrity and sealing ability of the flange joints. From previous studies, non-gasketed joint is claimed to have better performance as compared to conventional gasketed joint. To investigate non-gasketed joint’s performance i.e. joint strength and sealing capability under combined internal pressure and any applied external loading, an extensive 3D nonlinear finite element analysis is carried out and overall joint performance and behavior is discussed.

MICRO-CONSTITUENT BASED VISCOELASTIC FINITE ELEMENT ANALYSIS OF BIOLOGICAL CELLS

2010 ◽  
Vol 02 (02) ◽  
pp. 229-249 ◽  
Author(s):  
F. CHENG ◽  
G. U. UNNIKRISHNAN ◽  
J. N. REDDY
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Material Properties ◽  
Reaction Force ◽  
Experimental Studies ◽  
Viscoelastic Model ◽  
Material Model ◽  
Outer Cortex ◽  
Element Analysis ◽  
Actin Cortex

A viscoelastic analysis of the biological cell considering the microcellular material properties is carried out in this work. Three separate regions of the cell: the actin cortex, cytoplasm and nucleus are considered. The outer cortex and cytoplasm are modeled using standard linear viscoelastic model (SLS) and standard neo-Hookean viscoelastic solid, and a linear elastic material model is considered for the nucleus. The effect of the material properties of cytoplasm and actin cortex on the derivable parameters from three major experimental studies of magnetic twisting cytometry (MTC) and atomic force microscopy (AFM) and micropipette aspiration (MPA) are analyzed using the finite element method. The bead center displacement for the MTC, reaction force for AFM, and aspiration length ratio for the MPA are the major quantities derived from the finite element analysis. A number of parametric studies are also conducted and it is observed that SLS and SnHS models predict nearly identical results for the material constants.

Discussions on Behavior of Bolted Joints in Tension

2004 ◽  
Vol 127 (3) ◽  
pp. 506-510 ◽  
Author(s):  
Ouqi Zhang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Analytical Model ◽  
Bolted Joints ◽  
Axial Stiffness ◽  
Conventional Theory ◽  
Element Analysis ◽  
Stiffness Characteristics ◽  
Plate Connections ◽  
Made In

It is known that the behavior of real axisymmetric bolted joints in tension is much more complicated than that the conventional theory describes. Phenomenon conflicting with the theory prediction was observed in experimental and finite element analysis [Kwiatkowski, J. K., Winnicki, L. A., and Krzyspiak, A., 1986, “Stress Analysis of Bolted Tensile End Plate Connections,” Rozprawy Inzynierskie Eng. Trans., 34, pp. 113–137; Webjörn, J., 1988, “Die Moderne Schraubenverbindung,” VDI-Z, 130, pp. 76–78; Grosse, I. R., and Mitchell, L. D., 1990, “Nonlinear Axial Stiffness Characteristics of Bolted Joints,” ASME J. Mech. Des., 122, pp. 442–449; Gerbert, G., Bastedt, H., 1993, “Centrically Loaded Bolt Joints,” ASME J. Mech. Des., 115, pp. 701–705]. Recently, a new analytical model of bolted joints was presented [Zhang, O., and Poirier, J. A., 2004, “New Analytical Model for Axisymmetric Bolted Joints,” ASME J. Mech. Des., 126, pp. 721–728], based on which some discussions are further made in this note.

Sign in / Sign up

Export Citation Format

Share Document