PDF -Evaluation of Dynamic and Impact Wheel Load Factors - RailTEC - Impact Load Factors
Wait Loading...

PDF :1 PDF :2 PDF :3
PDF :4 PDF :5 PDF :6 PDF :7 PDF :8 PDF :9 PDF :10

PDF Impact Load Factors for Static Analysis Rice University clear rice edu mech403 ImpactLoadFactors pdf PDF introduction to impact loading PDH Online pdhonline courses s164 s164content pdf PDF Converting dynamic impact

PDF Impact of jet pdf icivil hu Civil team Structure 20I Impact 20of 20jet pdf PDF Experiment (3) Impact of jetsite iugaza edu ps mymousa files Experiment 3 hydraulics lab pdf PDF Impact of jetsite iugaza edu ps

- impact of jet wikipedia
- the impulse momentum principle impact of a jet
- what is the application of impact of jet in daily life
- impact of jet experiment manual
- impact of jet fluid mechanics pdf
- impact of jet chapter pdf
- impact of jet lab manual
- tecquipment jet impact apparatus

ageconsearch umn edu bitstream 204702 2 17 Anjani Kumar GLOBAL ECONOMIC CRISIS AND INDIAN AGRICULTURE IMPACTS AND PERSPECTIVES 509 meltdown, but there is lot of uncertainty about the magnitude of the impact of economic recession on agriculture It assumes more significance in India as more than half of

columbia edu itc hs medical pathophys id 2008 uti cystitis and ascending pyelonephritis, whereas Staphylococcus saprophyticus, which adheres significantly better to uroepithelium than do Staphylococcus aureus or Staphylococcus epidermidis, is a frequent cause of lower urinary tract infections In an individual with structural abnormalities of the urinary tract or

PDF Impact of Chinese goods on Indian Industry( pdf 1164 Kb)164 100 47 5 committee web Press 14 154P 2018 7 15 pdf PDF "Made in China" A Threat for Indiaoaji pdf ?n=2016 1201 1482658156

- impact of chinese goods on indian economy wikipedia
- impact of china market on indian economy
- impact of chinese goods on indian industry report
- chinese goods are threat to indian economy
- impact of chinese goods on indian industry pdf
- impact on indian economy of chinese goods are banned
- a study on impact of chinese product on indian economy
- report on impact of china on indian economy

eajournals wp content uploads The Impact of THE IMPACT OF CORPORATE GOVERNANCE ON FIRM PERFORMANCE EVIDENCE FROM BAHRAIN STOCK EXCHANGE Esra Ahmed1 and Allam Hamdan2 1Master’s Degree in Business Administration (MBA), Ahlia University –Bahrain 2Associate Professor of Accounting, Head of Accounting & Economics Department, Ahlia University –

PDF The Effects of Corporate Governance on Firm Performance120 107 180 177 1832 9901 099 2 06p pdf PDF the impact of corporate governance on firm Virtus Interpress virtusinterpress IMG pdf 10 22495cocv11i1c7art6 pdf PDF Impact of Corporate

- impact of corporate governance on firm performance research proposal
- corporate governance and financial performance pdf
- questionnaire on corporate governance and firm performance
- corporate governance and firm performance literature review
- impact of corporate governance on financial performance pdf
- corporate governance and performance pdf
- impact of corporate governance on firm performance in india
- corporate governance and firm performance ppt

usa visa dam VCOM download visa everywhere Moody’s Analytics attempted to answer this question by analyzing macroeconomic data for 70 countries between 2011 and 2015 By calculating the impact of card usage on per capita consumption, Moody’s Analytics was able to extrapolate the effect that the increase

PDF The Impact of Electronic Banking Services on the Customers Loyalty hrmars Article 06 The Impact of Electronic Banking Services pdf PDF effects of e banking on the financial performance of kenyan Core core ac uk download

- the impact of electronic banking on customer satisfaction
- internet banking thesis proposal
- negative impact of banking system
- impact of internet banking on financial performance
- the impact of e-banking on the profitability of banks
- impact of e banking in india
- negative impact of new technology on banking sector
- disadvantages of online banking

PDF impact of foreign institutional investment on stock market ijccr September2012 4 pdf PDF Impact of FII on Stock Market in India Research India Publications ripublication gjfm spl gjfmv6n8 11 pdf PDF

- impact of foreign institutional investment on stock market
- impact of fdi and fii in indian financial market
- role of fii in indian stock market
- impact of fdi on indian stock market ppt
- impact of fdi on stock market in india
- project report on foreign institutional investors
- fii pdf
- correlation between fii and nifty

Description

Rice University

- with a known velocity,

hitting an object and thereby causing a suddenly applied impact load

at least for the preliminary design

In a static stress analysis the static force (or weight of the mass) must be increased by an “Impact Factor” so as to obtain a good approximation of the maximum dynamic deflection and stress

- for vertical impacts,

is always greater than or equal to two

It is not unusual for the vertical Impact Factor to be more than 10,

- or more than 1,000

used to estimate the maximum deflection and stress in a beam due to the dynamic response of a cantilever beam having a weight,

- dropped vertically onto it

an energy balance approximation is used to estimate the required static load

That approximation assumes that all of the kinetic energy of the moving mass is converted,

- with an efficiency of
- to strain energy in the body

- or heat,
- or inelastic response,

and neglect the mass of the struck member then

? = 1 and the collision is 100% efficient

There are several handbook equations that provide corrections to the elementary theory based on the ratio of the striking mass to the member mass

- the vertical Impact Factor is
- ? = 1 + √1 +

? is the deflection of the member due to a static force (W) applied at the impact point in the impact direction

even if h = 0 this factor is equal to two

a mass moving horizontally with a velocity of v has an horizontal Impact Factor of

where g is the acceleration of gravity

There are handbook equations for the static deflections of bars and beams that can be used to define Page 1 of 13

In general the static deflection is

where k is the stiffness of the member,

- at the impact point,

in the direction of the impact

a finite element static stress analysis can be probed to obtain the static deflection,

in the direction of the force,

at the point of loading to obtain the value of

the mechanics of materials solutions,

- finite element simulations,

and a TK Solver worksheet will all be used to estimate the Impact Factor for example bars and beams

The first example (solved by all three methods) is for a weight dropped on the middle of a simply supported beam of rectangular cross‐ section

The mass of 80 kg is dropped vertically 10 mm from rest onto the center of a horizontal simply supported beam of length 1

The beam is steel (E = 200 GPa) with a rectangular cross‐section area having a width of 60 mm and a height of 30 mm

The first example causes an Impact Factor of about 6

The second example will yield an Impact Factor above 1,200

SolidWorks Finite Element Simulation: The SolidWorks model begins the first example with the cross‐section,

extrudes it to the beam length,

and adds vertical split lines to the solid to allow loading at the middle and/or quarter points,

and to recover the deflection and stresses there

Generating the symmetric beam member,

- with split lines

The beam member is pinned at the right and supported with rollers on the left

- 8 N) is applied at the center point

After assigning the material properties,

the static deflection at the point of loading is obtained:

Page 2 of 13

Rice University

Its value,

001049 mm,

is substituted into the above vertical factor equation,

- with 100 % efficiency,
- to yield
- ? = 1 + √1 +

010)1 = 5

so the actual static force needs to be

48 (784

- ?) = 4,301

- as seen below

Maximum horizontal stress (143 MPa) is at the center plane top and bottom

Of course,

since the static model is linear there is no need to re-run the model (unless you want pretty plots)

- 0 MPa could be multiplied by the 5
- 48 vertical Impact Factor to find the dynamic maximum SX stress of 143 MPa

Rice University TK Solver Model The TK Solver worksheet begins by writing a set of rules (from mechanics of solids and particle dynamics)

The basic TK Solver rules for impact forces

TK rules for five common member structural stiffnesses

The initial input variables (below) at the first solution (the first click on the TK lightbulb icon) were incomplete since neither the static deflection nor member stiffness was known

several rules were not satisfied as indicated by the lack of values in the Output column

Rice University

Initial velocity results,

without the beam stiffness However,

the stiffness of a simply supported beam at the center (load) point was calculated in the second solve (Lightbulb icon pick) from additional rules by inputting the beam properties,

- length,
- and load location (centered 0
- 6 m from the support)

Additional output of the beam stiffness for input for the member stiffness Page 5 of 13

Rice University There were enough inputs provided to calculate the stiffness of three of five typical members including the simply supported beam specified in this example (as seen above)

the value of that beam stiffness (k = 7

- 5e5 N/m) was copied from the output column,
- of k_simple,

and pasted into the input column of k

the next solve gives the desired Impact Factor values for both a horizontal or vertical impact

?) matches the finite element study well,

as does the vertical impact factor of about 5

(Had the weight been held at the beam surface without toughing it (h = 0) and then released that calculation gives the vertical Impact Factor equal to two,

- and a zero horizontal value
- ) In this case,

the vertical value was input as the impact factor and the next solve gave the equivalent force value as

- ? = 4,304

and the dynamic deflection was estimated as about

The following figure is an image of a hand solution example taken from the “Mechanics of Materials” text by A

- and the TK Solver solutions,
- as expected

Page 6 of 13

Rice University

Rice University

The second example models a 1 kg mass moving horizontally along a steel (E = 207 GPa) bar 100 mm long with a 10 mm diameter and striking the end of the bar with a velocity of 1 m/sec

- (It is taken from R

) It is assumed that the correction for the mass of the struck bar reduces the efficiency to η = 0

but the impact factor cannot be obtained without a member stiffness

So the first solution was to actually find the stiffness of the axial bar,

so it could be copied to the member stiffness input

First solve mainly finds the bar member stiffness to be copied

Rice University Having the member stiffness,

the impact factors are obtained along with a value of the “static deflection”

the latter (vertical load) value is only for reference since the impact is horizontal

The member stiffness yields the horizontal factor to copy

An impact factor defines the equivalent static force and the dynamic displacement This is a very large impact factor

the dynamic deflection still leads to a small elastic strain:

- ?⁄100

energy loss due to plastic action does not have to be estimated

there are corrections published to account for the mass of the bar

It is well known that for bars of a constant diameter the Impact Factor decreases rapidly with increased bar length

The equations for the Impact Factors neglect the mass of the member being struck

There are handbook equations that reduce the efficiency to less than unity by including the mass of the struck member

Some of those corrects are also provided as rules,

but they rarely reduce the efficiency below 0

In this case,

the bar mass correction only reduces efficiency to η = 0

- 96 Page 9 of 13

The member mass correction has little effect on the maximum dynamic displacement For a third example the effects of dropping an 80 kg mass from different heights onto the tip of a cantilever beam of 1,200 mm length will be illustrated

and 1 meter yields vertical impact factors of 2

respectively as seen in the following outputs

Rice University

- 00 meters As a final example,

- 1999 gives the following impact problem

- 2 m/sec when it impacts a tract end post

- at the point of contract,

Determine the maximum dynamic displacement of the post tip and the equivalent static force for determining the post stresses

Rice University The rectangular inertia value is copied into the beam member inertia so that typical beam and bar stiffnesses are evaluated,

- in the second solve

The cantilever stiffness value is copied into the member stiffness input so the third solve yields the horizontal impact factor of about 0

The final solve gives the dynamic displacement as about δmax = 11

- 6 mm and the equivalent static force of about Pmax = 275 kN,
- as seen below

There are enough data to obtain the correction factor for the post mass but it gives (below) almost complete efficiency,

so there is no need to re-run this set of calculations