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Topic: Stress analysis

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In the News (Wed 20 Mar 19)

  Analysis of Stress
Mathematically, the stress tensor is a second-order Cartesian tensor with nine stress components.
You assume the sign of a stress component is positive when its direction and the normal vector of the surface, on which the component of the stress tensor is acting, are of the same sign.
This is a vector representation of the symmetric stress tensor.
documents.wolfram.com /applications/structural/AnalysisofStress.html   (2251 words)

  Stress analysis - Wikipedia, the free encyclopedia
Stress analysis is an engineering discipline that determines the stress (physics) in materials and structures subjected to static or dynamic forces or loads (see statics and dynamics).
Most often the term stress analysis is applied to mathematical or computational methods applied to structures that do not yet exist, such as a proposed aerodynamic structure, or to large structures such as a building, a machine, a reactor vessel or a piping system.
A stress analysis can also be made by actually applying the force(s) to an existing element or structure and then determining the resulting stress using sensors, but in this case the process would more properly be known as testing (destructive or non-destructive).
en.wikipedia.org /wiki/Stress_analysis   (291 words)

 Overview of Stress Analysis
Stress analysis is used to ensure a component or assembly achieves its expected life.
Stress is never uniform in engineering components, and there often can be small regions of stress in a component that are in excess of the strength of the material, whereas elsewhere the stresses are relatively low.
A typical stress analysis hand calculation could use a beam bending or similar equation (Read about this equation on the Introduction to FEA 1 page here), or empirical data available from the famous 'Roark' book for example (Warren C Young, Roark's Formulas for Stress and Strain, 6th Edition, Mc Graw Hill International, 1989).
www.chalice-engineering.com /Analysis_Basics/Stress_analysis.html   (475 words)

 Stress Analysis   (Site not responding. Last check: 2007-10-25)
A stress state was analyzed using Mohr's circle, at a point opposite of the resultant of Forces F
The transverse shear, torsional, and axial stresses do not depend upon the length of the diameter, therefore, an analysis involving the transverse shear, axial, and torsional stresses is performed to determine the minimum diameter.
The maximum lengths are plotted against a range of diameters in the stress state analysis process map.
www.unix.eng.ua.edu /~acoley/Project/Pages/stress_analysis.htm   (280 words)

 Stress Life Analysis - FatigueCalculator.com
Stress concentration factors are used to account for locally high stresses.
Stress life curves are characterized by a slope and an intercept.
The theoretical stress concentration depends on geometry and relates the local maximum stress to the nominal or average stress by using a stress concentration factor.
www.fatiguecalculator.com /constamp/stresslife.htm   (718 words)

 Stolle Panda Bolt Stress and Deflection Analysis
In the analysis, the top plane of the receiver, shown in the view, is fixed in the Z-direction and the pressure is applied to the bolt face.
Dan Lilja assumes, in his analysis, that the shear stresses are uniform over the area of the bolt body to lug.
However with the more detailed calculation, the shear stress are shown to have a maximum near the base of the lugs and decreases to as little as fifth of maximum near the forward end of the bolt.
www.varmintal.com /abolt.htm   (1138 words)

 Pipe stress analysis and flexibility calculations   (Site not responding. Last check: 2007-10-25)
These stress engineers were qualified with a rating from 1 to 10.
All too often a high rated stress engineer is outranked by a "smooth talking young colleague".
The objective of this web-site is to form a platform for stress engineers with 15+ years of experience.
home.hetnet.nl /~paul_voorhaar/Pipestress   (277 words)

 The National Institute For Truth Verification, Voice Stress Analysis and Lie Detection Experts. Manufacturer of the ...   (Site not responding. Last check: 2007-10-25)
reports that their “research suggests that psychological stress may be detected as acoustic modifications in the fundamental frequency of a speakers voice” and “that the fundamental frequency of the vocal signal is slowly modulated (8-14 Hz) during speech in an emotionally neutral situation.
Professor Chapman’s study confirmed that voice stress analysis was accurate when utilized as a truth verification device and produced a confession rate of 94.8% of the responses where deception was indicated (Available from NITV).
The authors concluded that “audio stress can be detected with a voice stress analyzer in psychiatric patients during the course of therapy and that the VSA could serve as a useful tool for this purpose” (Available from Library of Congress).
www.cvsa1.com /studies.php   (885 words)

 Swales Aerospace - Engineering Competencies - Stress Analysis
Stress analysis is an essential part of the design process that ensures the structural integrity of spacecraft structures, electromechanical devices, and mechanisms.
Analysis performed on optical instruments for spaceflight is a large part of the work done at Swales.
This analysis involves the development of a detailed finite element model that is used with NASTRAN to determine the motion and deformation of individual optical components.
www.swales.com /engineering/stress_anal.html   (542 words)

 BEAR Inc. - Stress Analysis
Analysis results are available in the form of photo-quality prints or computer video files that can be viewed on any personal computer or displayed in the courtroom using a standard PC projector - there is no need for additional animation, as pictures and computer video of the results are generated automatically during the analysis.
The finite element analysis demonstrated that the sleeve generated high stresses at the point of contact due to both bolting and system loads.
The first method uses the strains measured when a cut of progressively increasing depth is introduced by wire electric discharge machining to obtain the stress normal to the faces of the cut.
www.bearinc.com /stress.html   (523 words)

 Stress Analysis ans Fracture Mechanics -abs.
Results obtained indicate that stress intensity factors of cracked components exposed to thermal fatigue conditions have a significant dependence on the frequency of the thermal cycle and the crack geometry.
Results indicate the thermally induced stress intensity factor of cracked components cycled by the direct resistance method of heating increases with the frequency of the thermal loading and may become quite large at higher frequencies.
A set of path independent integrals is constructed for the calculation of the generalized stress intensity factors occurring in elastic plates having sharp re-entrant corners or notches with stress-free faces and subjected to Mode 1, 11 or III type loading.
www.me.cmu.edu /faculty1/griffin/principal/abstract/S.An_Fr_Me.htm   (644 words)

 Stress Analysis - JLR   (Site not responding. Last check: 2007-10-25)
Stress analysis is probably the most common application of the finite element method.
The primary unknowns (degrees of freedom) calculated in a stress analysis are displacements (translations and rotations).
Other quantities, such as strains, stresses, and reaction forces, are then derived from the displacements.
www.jlrcom.com /stress.htm   (229 words)

 Materials Failure Analysis, and Stress Corrosion Cracking
Stress corrosion cracking is a failure mechanism that is caused by environment, susceptible material, and tensile stress.
An externally applied load is not required as the tensile stresses may be due to residual stresses in the material.
Stress corrosion cracking is an insidious type of failure as it can occur without an externally applied load or at loads significantly below yield stress.
www.materialsengineer.com /CA-scc.htm   (250 words)

 IDAC Case Study Archive: stress analysis, crash test, vibration analysis,...
The object of the analysis was to determine the suitability of the vehicle structure for some 75 load cases to simulate the operational loads that are applied to the vehicle (more...
Analysis project undertaken by IDAC to investigate two sizes of a replacement knee design at different angles of articulation using the general purpose finite element software ANSYS (more...
Analysis project undertaken by IDAC to investigate the design and support capability of a load far in excess of the load that would be expected in normal service (more...
www.idac.co.uk /consulting/casestudies/casestudy.htm   (638 words)

 Stress Analysis - Method of Analysis
The displacement method of finite element stress analysis can be used to calculate the linear and nonlinear response of structures subjected to static and dynamic loads.
The state of stress of the idealized structure is obtained by compiling the results for the states of stress of the individual elements.
The state of stress of an individual element is obtained by solving Equation 1 for the system displacements, identifying the element displacements, solving for the element strains, and then solving for the element stresses.
www.consistentformulations.com /StressMA.htm   (313 words)

 Residual Stress Analysis   (Site not responding. Last check: 2007-10-25)
Major attention was paid to developing the predictive model for analysis of the influence of the residual stresses and their redistribution under the effect of improvement treatments and cyclic loading on the fatigue life of welded elements.
Searching for initial data for comparative analysis is carried out according to the selected combination of design and technological parameters of the welded elements, as well as according to the type and parameters of improvement treatments.
Detailed analysis of the influence of residual stresses and their redistribution under the effect of cyclic loading in the zones of stress concentration is performed during such assessment.
www.itlinc.com /pStressWeld.html   (362 words)

 Voice Stress Analysis   (Site not responding. Last check: 2007-10-25)
I had heard of voice-stress analysis 25 years ago, and most people probably remember the voice-stress analyses which were done on Lee Harvey Oswald's famous: "I am a patsy" statement.
I had no idea, however, that voice-stress analysis was being widely used in law enforcement as a hiring and investigative tool.
While the polygraph measures changes in a person's body associated with stress - alterations in heart rate, breathing, and emotional sweating, the Computerized Voice Stress Analyzer (CVSA) measures changes in voice frequency, which identifies stress that may indicate a lie.
www.cjjohns.com /c_law/voice_stress.html   (547 words)

 Aircraft Designs, Inc: Index.
Finite element analysis modeling (fea) using the EMRC NISA fea program, together with hand calculations, are used to show that a structure will not fail at ultimate loads nor yield at limit loads.
On the left, the shear stress in the face sheet is shown on a deflected wing.
After a static analysis is performed, the fea input file is modified to perform the eigenvalue analysis necessary for a flutter analysis.
www.aircraftdesigns.com /stress-analysis.html   (238 words)

 Stress Management, Stress Cards, Relaxation Training, Biofeedback Low Cost Tools, Tapes, Supplies
stress control trainers to enhance workshop/program interest and post training generalization of skills.
The GSR reflects sweat gland activity and is commonly used to teach stress reduction and management.
You can use computerized psychophysiological stress profiling to identify which psychophysiological systems are most responsive to different kinds of stressors using this powerful technology.
www.futurehealth.org /stressma.htm   (1423 words)

 American Polygraph Association   (Site not responding. Last check: 2007-10-25)
This document was pivotal in the decision by the Virginia State Legislature to disallow the use of computer voice stress analyzers in criminal investigations.
Some studies looked at the CVSA device in particular, while others investigated whether voice stress analysis in general could be used to detect stress or deception.
Timm, H. The efficacy of the psychological stress evaluator in detecting deception.
www.polygraph.org /voicestress.htm   (815 words)

 Newhouse A1   (Site not responding. Last check: 2007-10-25)
Originating from a Cold War military project, voice stress analysis was first commercialized in the early 1970s.
Researchers counter that nothing in 30 years of studies proves that voice stress analysis works, either generally or in the specific case of the CVSA.
Haddad, in a 2000 study, found that two commercial analyzers were accurate in detecting stress, but couldn't differentiate between stress caused by anger, fear, lying or just needing a bathroom break.
www.newhouse.com /archive/story1a110501.html   (1516 words)

 A Stress Analysis
If a small elemental strip of cloth from a strapless evening gown is isolated as a free body in the area of plane A in Figure 1, it can be seen that the tangential force F1 is balanced by the equal and opposite tangential force F2.
The downward vertical force W(weight of the dress) is balanced by the force V acting vertically upward due to the stress in the cloth above plane A. Since the algebraic summation of vertical and horizontal forces is zero and no moments are acting, the elemental strip is at equilibrium.
Assuming that the female is naturally endowed to supply the vertical force V, the problem is still left incomplete unless an analysis is made of the structures supplying this force.
gendertree.com /a_stress_analysis_of_a_strapless.htm   (1391 words)

 What Is Voice Stress Analysis?   (Site not responding. Last check: 2007-10-25)
Voice Stress Analysis (VSA), originally known as Psychological Stress Evaluation (PSE), is a procedure used for detection of deception (lie detection) or truth verification or to determine psychological stress profiles.
Most of the functional indicators of stress are attributed to the Autonomic Nervous System, physiological tremor as seen in the voice mechanism is controlled by the Central Nervous System; as the ANS gains dominance in a stress situation, the micro-tremors are suppressed, and the FM in the voice utterance is moderated or completely disappears.
Combining the “Science” of voice stress analysis and the “Art” of detection of deception testing, BAKER- DVSA requires standardized chart reading analysis, time-proven procedures, and specialized examiner training to excel in detection of deception or covert narrative analysis.
www.bakerdvsa.com /voicestressanalysis.html   (817 words)

 Language Log: Analyzing voice stress
These tests sometimes work and sometimes don't, partly because the cellular stress displays need to be interpreted by trained experts, who are typically participating in a diagnostic team or at least given access to lots of other information about the patients being diagnosed.
This is supposed to be a more general muscular phenomenon, but the "voice stress" applications depend on measuring the intensity of this tremor in the fundamental frequency (pitch) of the voice, caused by "microtremors" in the muscles of the larynx.
Look for "microtremor" or "voice stress" and you'll find lots of pages discussing whether or not the methods work -- but nothing, as far as I can tell, telling you in mathematical or algorithmic detail what the methods really are, much less offering code that implements them.
itre.cis.upenn.edu /~myl/languagelog/archives/001149.html   (1661 words)

 Stress analysis & structural analysis software want bolt tension, not torque. Structural design depends on bolt stress, ...
Stress analysis & structural analysis software want bolt tension, not torque.
Stress analysis is sometimes limited by the manufacturer's capability to control bolt pre-load.
Your joint's stress analysis can be verified using a bolt gage.
www.surebolt.com /Stress_Analysis.htm   (641 words)

 Research casts doubt on voice-stress lie detection technology   (Site not responding. Last check: 2007-10-25)
Feb. 10, 2004 -- Voice-stress analysis, an alternative to the polygraph as a method for lie detection, is already widely used in police and insurance fraud investigations.
Various distributors of voice-stress analysis systems suggest that recent advances in the technology, such as layered voice-stress analysis, have elevated voice-stress lie detection to new levels of dependability and effectiveness.
Some suggest that the dismal performance of voice-stress analysis lie detection in recent federal studies can be attributed to improper test conditions or to tests being conducted using outdated and inferior versions of the technology.
news-info.wustl.edu /news/page/normal/669.html   (1189 words)

 Meta-analysis of stress ulcer prophylaxis
Data analysis: when pooling similar studies, the authors reported the 95% CI for the weighted odds ratio of the outcome of interest in the treatment vs. placebo groups (or one treatment vs. another).
This area of literature review is quite confusing to me (your comment about trending not being significant and should have no weight in either multi-study analysis or in the individual study).
They state that the analysis of one of the studies should have looked at 6-month rather than 2-week mortality and that one of the studies should not have been included.
www.journalclub.org /vol1/a13.html   (1690 words)

 Stress analysis (Knowledge Summary)   (Site not responding. Last check: 2007-10-25)
Stress is most fundamentally expressed as load divided by area.
The methods of stress analysis have been developed to give engineers practical methods for assessing the level of stresses.
Stress distributions are usually classified as either linear or non-linear by engineers.
www.joinal.org.uk /j32k/getFile/kssds001.html   (430 words)

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