This document describes the design of a blast-resistant window. It discusses three designs that were created and evaluated. Design 3 was found to be the most efficient and cost-effective solution. It uses four dampers to absorb pressure from blast waves and increases the window's maximum pressure capacity to 18.2 psi. Pressure-impulse and pressure-time curves were generated to analyze the window's performance. Design 3 provides enhanced structural strength compared to the other designs while maintaining a relatively low cost. The document also discusses considerations for adapting the window design for different materials and threat levels.
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http://imdevsoftware.wordpress.com/2014/10/11/2014-metabolomic-data-analysis-and-visualization-workshop-and-tutorials/
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Fourfold Restitution, Rebuke, Church Membership, Fourfold Restitution, four times as much
There is no one so poor as the wealthy man who puts all his trust in riches. We are human beings! God doesn't judge us based on our possessions. Riches make terrible masters but awesome servants!
This document is a base-line report that shows, by way of statistics, facts and figures, the state of the Bumiputera socio-economy, within the larger context of national macro-economic indicators.
Serious implementation of effective distributive policies, are needed urgently if we are to change the narrative of Malaysia’s development trajectory and secure the chance of an equitable and sustainable future for Malaysia and Malaysians.
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Get more information:
http://imdevsoftware.wordpress.com/2014/10/11/2014-metabolomic-data-analysis-and-visualization-workshop-and-tutorials/
Recently I had the pleasure of teaching statistical and multivariate data analysis and visualization at the annual Summer Sessions in Metabolomics 2014, organized by the NIH West Coast Metabolomics Center.
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In the sermon on the Mount, Jesus spoke of two treasuries: our treasury in heaven and our treasury on earth, warned of the importance of seeing life from God's perspective and the urgent need to choose to serve God or Mammon will by default become the master of our life.
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2. Purpose
• Provide a permanent window design able to
withstand high pressure waves
• Decrease injuries and damages suffered due to
window failures in cases of exposure to high
pressure waves
• To create a design that is highly adaptable and
applicable in its purpose (walls, doors, windows,
etc.) and materials (lexan, acrylic,
annealed/tempered glass, etc.)
3. Procedure & Software
Used
Create design based
on wanted
parameters
Product Analysis &
Specs Evaluation
Cost Evaluation
Satisfied?
Edit and optimize
existing design
lightly
Not even close
Meh
YES
PTC Creo Parametric 3.0
PTC Mathcad 3.0
RMTool
ISADS
aPriori 2015
4. Design Considerations
• Created with the purpose of providing a blast-
resistant window for Box Canyon’s permanent
control building
• Allows for visual confirmation of testing steps from
within the building
• Allows for higher-scale tests without compromising
personnel safety
5. Design Considerations
• Must also be easily applicable to systems other than
control building’s windows
• Low maintenance, long lifespan
• Space-efficient
• Cost-efficient
9. Design #1 - Strengths
• Robust design
• Increases maximum pressure capacity by 6.27 psi
(each damper for 1.57 psi)
10. Design #1 - Weaknesses
• Inefficient use of space
• Cost-per-capacity is high
o $628.77 for entire window, $55.63/psi of capacity
o Due to high machinery cost - complex custom-made parts
14. Design #2 - Strengths
• More efficient use of space
• Increases maximum pressure
capacity by 10.02 psi (each damper
for 2.51 psi)
• Cost-per-capacity is lower
o $ 463.27 for entire window, $24.28/psi of capacity
15. Design #2 - Weaknesses
• Weak structural strength
o Much higher shear than stress
• Ineffective shock absorption
o Angle w/ vertical <45°
19. Design #3 - Strengths
• Most efficient use of space
• Cost-per-capacity is lowest
o $501.24 for entire window,
$12.58/psi of capacity
• Increases maximum pressure capacity by 18.2 psi
(each damper for 4.55 psi)
• High structural strength
22. Pressure-Impulse Curves
• Reference values obtained from ISADS’ P-I curve for
designated polycarbonate thickness
• Using approx. 20 data points on prospective critical
pressures
23. Pressure-Impulse Curves
• Hand calculations on:
• Finding net force applied
• Finding total force absorbed by dampers
• Finding displacement-, velocity- and acceleration-time relationships
• Micro-harmonic equations of motion on normal windows
• Time taken for full compression (known final displacement)
• Creating pressure-time curve for a specific peak overpressure from
reference curve
• Adding time considerations (harmonic & damping motions) while
maintaining peak overpressure
• Drafting a new pressure-time curve for specified design
• Integrating curve to obtain critical impulse value for specified pressure
25. • Effects overall window strength during reverse
motion phase
• Good commercial use, horrible protective use
• Direction of inertial motion opposes direction of blast wave; higher
stress every (n+¾th) in exposure time
• Grains in center affected the most
• Premature failure in the center; starts with micro-scale crack
• Crack propagates very quickly in brittle materials
• Premature failure most evident at lower exposure time
o Harmonic motion period is in the order of micro/nanoseconds
o Enough time for window to complete hundreds of cycle – both
lower and higher exposure time will experience this
o Longer exposure time allow grains to ‘adjust’ as force received
increases more gradually. This modifies grain shape to withstand
more force before first crack (to a certain extent)
Micro-Harmonic Motion
26. • New design effectively ‘removes’ this effect
o Directly attached to both sides (Screws and inner frame)
o Decreases premature crack significantly
• Higher window strength especially at lower
exposure time (most evident in P-I curve to the right
of the vertical asymptote)
o Helps create a different slope in the P-I curve.
Micro-Harmonic Motion
33. Design #3
Part Name Cost
Front Window Frame 43.67
Lexan Window 12.80
Inner Frame 18.70
Damper Body (x4) 13.86 (x4)
Damper Spring #1 (x4) 5.27 (x4)
Damper Actuator (x4) 6.02 (x4)
Damper Spring #2 (x4) 3.10 (x4)
Damper Elbow #1 (x4) 18.11 (x4)
Damper Support (Ax2 & Bx2) 2.23 (x4)
Damper Elbow #2 (x4) 10.02 (x4)
Damper Head (x4) 3.55 (x4)
Damper Spring #3 (x4) 1.08 (x4)
Fasteners (Screws) ~3.00
Assembly & Machine Use Cost 160.55
Predicted Mark-up Price 200.31
Total 691.99
• Radial tolerance set at 0.1 cm; pin-shaft at 0.1 mm; others at 0.25-1.00 cm
• Based on 60th percentile across the United States (aPriori): TX is at 63rd
34. Adaptability
• For window surfaces with <7.25 psi maximum
pressure capacity, must use anti-shatter film as
window will break before damper acts
• 7.25 psi is obtained from 2.5(FoS)*2.9psi(Total static resistive forces)
• 6.88 psi is the maximum pressure the window needs to withstand
before damper reaches full compression
• Will require replacement after every blast (cracks)
• Does not require replacement or anti-shatter film
when using any window surface with >7.25 psi max.
pressure capacity
35. Recommendations
• Use of anti-shatter film is advised regardless of
window surface
• Additional thin lexan sheet attached to the back
window frame (to create air-and-water-tightness)
• Use of Hydraulic fluid to fill Damper Elbows #1’s and
#2’s cavities (i.e. Thioplast G21)
$262.32 for all 4 dampers
Robust design as it is designed to move only in one direction that’s parallel to the direction of blast wave
Thioplast G21 inside dampers for higher viscosity
$262.32 for all 4 dampers
$160.32 for all 4 dampers
$160.32 for all 4 dampers
Green dashed line: first structural crack – fluid leakage thus not usable