AmmoTech > 2.1.3 > Flashcards

2.1.3 Flashcards

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1
Q
  1. Define an Explosion
A

A violent release of energy in the form of heat, light and a large volume of gas / pressure rupturing a confining structure.

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2
Q
  1. Types of Explosion?
A

Physical (or mechanical)
Chemical
Nuclear

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3
Q
  1. Define a Physical Explosion
A

A rupture of contained gas or vapour release rapidly, with NOISE and VIOLENT movement

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4
Q
  1. Define a Chemical Explosion
A

Extremely rapid reaction of a chemical system to produce a rapid expansion of gas and heat

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5
Q
  1. Define a Nuclear Explosion
A

A sudden release of enormous quantities of heat by fission or fusion processes

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6
Q
  1. Define a Blast
A

A violent disruptive effect caused by an explosion. From the explosion there will be a evolution of heat and gases and a SHOCK FRONT starting from the centre

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7
Q
  1. What are the phases of a Blast?
A

SHOCK front
POSITIVE pressure phase (compression)
NEGATIVE pressure phase (rarefaction)

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8
Q
  1. What are the effects of a blast wave:

Reflection?

Diffraction?

A

R - It bounces backs or reflects out at an angle from a boundary

- Incident wave: incoming wae
- Reflected wave: wave that is bounced back

D - Breaking up or SCATTERING of a wave by an obstacle

  • The blast wave is thrown back at an angle to the original path, and/or
  • The bouncing back of a wave after it strikes a boundary

Breaking up or scattering of a wave by an obstacle

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9
Q

1 . Basic Principle of a Fuel Air Explosion?

A

Creating an aerosol cloud of fuel air mixture

then detonated for an explosive effect

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10
Q
  1. List the 7 main targets of FAE
A 
SCPMSBC
Structures
Concentrations of AFV and SP guns
Parked aircraft
Minefield clearance
Ships
Bunkers / trenches
Concentrations of troops in the open
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11
Q
  1. Using the Probability Product Rule, what is the
    probability of a kill, given P(L) (Lethality) = 60%, P(R)
    (Reliability) 80% & P(H) (Chance of hit) = 60%?
A 
P(K) = P(H) x P(R) x P(L)
PK = .6 X .8 X .6
PK = .288 or 29%
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12
Q
  1. What are the 6 main types of targets most frequently

engaged by fire?

A

PEVSACx

People
Vehicles
Structures
Equipment
Aircraft
Complex
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13
Q
  1. List the 3 levels of damage which an ammunition

designer may wish to achieve in regards to Target Analysis?

A

Disablement

Destruction

Neutralisation

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14
Q
  1. On the battlefield there are 3 types of key target groups that present themselves to land forces, list them?
A

People
Attack on Armour
Aircraft in flight

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15
Q
  1. Kinetic & Chemical are 2 main sources of energy employed in ammo design. Briefly describe each?
A

KINETIC Energy

- In the form of a solid missile (a "shot") 
- dissipates energy on impact  
- requires no triggering device to control the energy release

CHEMICAL Energy

  • In the form of a substance
  • has considerable potential energy relative to its mass,
  • can be released when suitably initiated
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16
Q
  1. What are the types of aircraft targets? (3)
A

FSH

Fast moving

Slow moving

Helicopters

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17
Q
  1. Aircraft Damage Criteria What is the standard criteria for damage and their effect on the target? (6)
A

KK-Kill target suffers IMMEDIATE and catastrophic disintegration
K-Kill destroyed in < 10 secs
A-Kill < 5 mins
B-Kill < 5 hours
C-Kill mission abort (mission unable to be achieved)
E-Kill target may complete the mission but will require repair before flying again.

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18
Q
  1. Aircraft Vulnerabilities (8)
A 
Air frame
Aircrew
Fuel tanks
Engines
Power transmission systems
Flight controls
Avionics
Bomb load
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19
Q
  1. Types of Warheads against aircraft (7+)
A

BFF…SkScSpC

Blast
Frag
Frag + blast
Special Kinetic energy
Discrete and Continuous rod
Shaped Charges
Sub-projectiles
Cluster
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20
Q
  1. Effects of Altitude (4)
A

Density
Miss Distance
Attenuation
Altitude increases / warhead increases

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21
Q
  1. Reduction of Aircraft Vulnerable Areas (5)
A 
ABCSS
Armouring
Burying sensitive components
Concentrating sensitive components
Separating components
Self-sealing fuel tanks
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22
Q
  1. What is the effect of Miss Distance?
A

Increase miss distance = increase NEQ

A greater NEQ is required as the miss distance increases

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23
Q
  1. Personnel - Types of damage? (2)
A

Physical

Mental

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24
Q
  1. The most efficient mode of attack against personnel requires…? (3)
A

High PROBABILITY of a hit

Rapid TRANSFER of energy

NO unnecessary OVERKILL

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25
5. What type of shells are Fragment attack PRODUCERS (3)
GPP Generic HE projectiles Pre notched containers Pre formed fragments
26
5. Control of Fragment SIZE is ACHIEVED by what? (4)
CTQV - Case material and its mechanical properties - Thickness of the wall - Quantity of explosive and its position in relation to the fragmenting case - VOD
27
5. Control of Fragment VELOCITY is CONTROLLED by? (3)
DwAxCd - Density of the wall material - Amount of explosive behind the fragment wall - Charge density and velocity of detonation
28
5. What are the factors affecting performance of fragmentation?
DOHA 1. DISTRIBUTION of frag: - Spin rate will influence but not pattern - Usually symmetrical on longitudinal axis - Angle of arrival 2. Orientation of projectile - Effective distribution when angle is vertical - Increasing amount of frag is projected into the air or ground as the angle changes 3. Height of burst - 2-4 metres is best - achieved by fuzes 4. Average area of exposed target - Target posture - Terrain - PPE
29
5. The severity of casualty or type of wound depends on what? (3)
Actual energy transferred Rate of transfer of energy from projectile to target Tumbling/yawing reduces energy transfer
30
5. FACTORS AFFECTING energy transfer of Frag weapon onto personnel (3)
Mass and velocity Cross sectional area fragment stability
31
6. List the 3 basic modes / methods of attack to defeat armoured vehicles and fortifications
KCC Kinetic energy Chemical energy A combination of both
32
6. Types of Armour Construction
RSPFECS ``` Rolled homogenous armour Spaced homogenous Ply Face hardened Explosive reactive armour (ERA) Composite (Chobham) Slat (bar) ```
33
6. APC & MICV (IFV) assessment criteria?
F - firepower kill | P - payload kill (Inf in the back)
34
6. What are the types of shot failure when striking armour? Explain each
Barrelling - Shot bellies at the midpoint due to direct compression failure. Shot fails to penetrate. Shattering - Severe hoop stresses are set up at the nose, due to hardness of the metal. Shot cracks Lateral bending - The shot is subject to lateral stresses at high angle of attack
35
6. What are ways to Increase Penetration? (5)
``` Lengthening of the BARREL Lengthening the PROJECTILE RA - Rocket Assistance Improve STEADINESS of shot Use of segments long rod penetrators ```
36
6. HEAT - Factors affecting Shape Charges (5)
``` Cone diameter Shape of liner Liner material Stand-off distance Rate of spin ```
37
6. Types of chemical energy ammunition
HEAT HESH (HE Squash Head) Plate charges
38
6. Behind Armour Effects
BAE contribute to lethality of attack | Effects may be physical, psychological or physiological
39
6. BAE TYPES (4)
Luminescence Spalling Heat/fires Overpressure
40
6. Methods of weapons/Delivery of Plate Charges (5)
GGMAM Guns Grenades Mines Aircraft bombs Missiles
41
Factors taken into consideration in the defeat of armour (4)
Residual energy Accuracy Reliability Lethality
42
1. Description of Kinetic Energy
In the form of a solid missile/projectile, which dissipates it's energy on impact and requires no triggering device to control the energy release.
43
1. Description of Chemical Energy
In the form of a substance, with a considerable potential energy, relative to it's mass, which can liberate that energy when suitably initiated. Such materials are familiar as HE and the initiation mechanism as the fuze.
44
7. General Principles of HESH?
Rebounding tension wave meets further primary shock wave Large scab is detached from the rear surface
45
7. HESH Scab size in reference to its diameter
generally 1.25 to 1.5 times its own diameter Velocity of scab 30 - 130 metres pers sec
46
7. What are the factors affecting the performance of HESH? (3)
Calibre Angle of attack Striking velocity
47
7. HESH performs well against? (3)
Emplacements Pill-boxes Concrete structures
48
7. Types of armour that defeat HESH (4)
Spaced armour Skirting plates Grooved Reactive armour
49
7. Secondary effects from HESH (2)
Anti-personnel effects Damage to sensitive equipment
50
8. What does "APDS-T" stand for?
Armour Piercing Discarding Sabot - Trace
51
8. What are the 2 parts of Discarding Sabot?
Petal | Pot
52
8. 2 types of stabilisation used for Kinetic Energy Weapons?
Fin | Spin
53
8. What does "APCNR" stand for
Armour-piercing Composite Non Rigid
54
8. What the 3 types of Ballistic Requirements
Internal (Intermediate) External Terminal
55
9. What are the FACTORS affecting the performance of shaped charges? (5)
- Cone diameter - Shape of liner - Liner material - Stand-off distance - Rate of spin
56
9. With a shaped charge the residual energy after penetration lies within what materials? (2)
- Unconsumed part of the jet | - Fragments of metal
57
9. What is the principle of Shaped Charges?
If the energy from a HE charge could be FOCUSED or channeled to a point, it would be reasonable to expect that extremely high local energy levels could be achieved
58
9. How do shaped charges achieve their effect?
Intense concentration of kinetic energy
59
9. What is the Secondary effect of Shaped Charges
Anti-personnel effects from the fragmentation of the external casing
60
9. Means of spin compensation for shaped charges/projectiles
Slipping driving bands Fluted liners Spin compensated liners
61
1. What are the primary effects of an explosion
Blast Heat Fragmentation
62
1. List the different types of fuel for FAE
L A B E K A P ``` Liquidated gases Acetylene Butane Ethylene oxide Kerosene Aluminium Propylene oxide ```
63
1. Advantages of FAE
Greater overpressures than HE Requires little or no oxygen in the molecular structure 3-5 times hotter than HE
64
2. Basic techniques used in the attack of aircraft in flight (4)
Blast Frag Blast and Frag Special KE
65
2. Frag Warheads. Explain wastage and how a frag warhead can be made more EFFICIENT
- 80% inefficient. Efficiency improved by: - HE+Frag in narrow beam/ in one chosen direction
66
8. KE Warheads - External & Terminal Ballistic Requirements? (3 + 1,1)
Small cross section High mass High velocity Ext B: Aerodynamic design Term B: Hard material
67
9. SC Stand-off distance for Shaped charges?
5 CD - best performance
68
9. Plate Charges. What are they also known as?
Miznay-Schardin Effect Plate charge EFP Self forging fragment
69
10. Decribe burning to detonation
Sudden accelerating of a flame front until a shock wave is formed. - When explosives are confined in a tube and ignited at one end, the gas generated cannot escape. - Pressure builds up the burn rate which may accelerate to sonic velocity - A shock wave of formed and transforms into a detonation.
70
Define Deflagration
Subsonic combustion that usually propagates through thermal conductivity of Iayers
71
Define Detonation
Supersonic exothermic front Accelerating through a medium that drives a shock front directly in front of it
72
What are the requirements for Propellants (5)
``` Give regular ballistics not produce excessive flash or smoke not cause undue erosion be relatively easy ignited be stable for storage under Worldwide conditions ```
73
List the Ways for the Initiation of Explosives (8)
``` Direct heat Percussion and Stabbing Friction Electrical Initiation Shock Waves Electromagnetic fields Laser Chemical Reaction ```
74
What are the requirements for Explosives? (6)
``` Performance Sensitivity Stability and behaviour in storage Water resistance Consistency Thermal behaviour ```
75
What is Brisance
The shattering effect of explosives
76
Regarding Blast Pressure, what is: Dynamic Pressure? Incident pressure? Quasi-Static Pressure Reflected Pressure
DP Results from high wind velocity & increased density of the air behind the shock front IP Pressure exerted at right angles to the travel of the shock front Q-S P When an explosion occurs with a structure - overpressure eventually settles RP Instantaneous build-up of pressure occuring when a shockfront strikes a rigid surface
77
1. Chemical Explosions must exhibit what? (4)
Rapid expansion Evolution of heat Rapidity of reaction Initiation of reaction
78
1. Disadvantages of FAE
FAE is dependent on weather conditions
79
What is Mach stem?
Occurs when the reflected blast wave coiside wit hte original wave
80
2. TA
Slides re: Atks on Pers, amr and a/c
81
3. What are the general principles Regarding an A/C target? (2)
Types of A/C targets - Fast, slow, Helo Vulnerability Parts of the A/C (8)
82
3. A/C Damage Criteria: "Second Criteria" used by Industry ? (3)
F t -Flight Kill : a/c will be unable to fly within (t) C t -Continuance Kill: a/c will be unable to continue with (t) E t -Effectiveness Kill: a/c will be grounded for repair by (t)
83
Classification of High Explosives. What are the 2 types; list 2 examples each
Primary Explosive: Very sensitive Mercury Fulminate, Lead Azide, Lead Styphnate Secondary Explosive: relatively insensitive TNT, RDX
84
6. Armour "Kill" types and descriptions (3)
K Kill - destroyed Firepower Kill - Main armament and/or crew unable to operate the system Mobility Kill - Vehicle unable to move due to running gear and/or engine disabled
85
7. What are the design characteristics of HESH? | 6 "must"
- Head must be collapsible - Head must not be pointed - HE must have a high VoD - Explosive be plastic in nature - Fuze must be in the base - Inert bitumous pad in nose
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