Test 3 - Target Analysis Flashcards

1
Q

Define Explosion:

A

A violent and rapid decomposition of energetic material to produce energy (heat) and gas which will lead to violent pressure rupturing of any confining structure. May be Nuclear, Chemical or Physical.

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2
Q

Define Chemical Explosion

A

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

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3
Q

Define Physical Explosion:

A

May be natural such as a volcano or lightning strike or structural such as failure of a pressurised gas container.

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4
Q

Define Nuclear Explosion:

A

Sudden release of enormous quantities of heat by fission or fusion proccesses

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5
Q

Define Blast:

A

Violent disruptive effect caused by an explosion. From the explosion there is an evolution of heat, gases and a shock front which emanates from the centre of the explosion.

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6
Q

Explain/ what is the basic principle of FAE?

A

Consists of creating an aerosol cloud of a fuel air mixture, which is then initiated to create an explosive effect, the blast wave formed inside generates high overpressure inside the cloud.
not a fire such as napalm.

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7
Q

4 Factors affecting VoD

A
  • Diameter of the Charge
  • Density of the Charge
  • Degree of confinment
  • Detonator’s Strength
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8
Q

Explain Burning to detonation:

A

-Occurs when there is an abrupt acceleration of the flame front until it becomes a shockwave.

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9
Q

4 shock Wave behaviours?

A
  • Reflection (bounces back once hit boundary)
  • Diffraction (breaking up/scattering by an obstacle)
  • Overpressure vs Distance (peak pressure fall over dist)
  • Over pressure vs Time
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10
Q

Explain Reflection:

A
  • The blast wave is thrown back at an angle to the original path
  • The bouncing back of a wave after it strikes a boundary.
  • Equal angle of reflection to the incident wave
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11
Q

Explain Diffraction:

A
  • Breaking up or scattering of a wave by an obstacle.
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12
Q

Explain Probabilty Product Rule:

A
Probabilty of getting a Kill, culmative with multiple rounds.
PK = PH x PR x PL
PK = Kill Probability 
PH = Hit Probability
PR = Reliability of weapon system
PH = Lethality of ammo
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13
Q

Three damage levels used for ammo design:

A
  • Disablement (prevent from doing job)
  • Destruction (kill/destory target)
  • neutralisation (causalty causing, people not material)
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14
Q

2 Energy Sources employed in Ammo Design

A
  • Kinetic Energy (KE)
    • In the form of a solid missile, which dissipates its
      energy on impact & requires no triggering device
      to control the release of energy.
  • Chemical Energy (CE)
    • In the form of a substance, with a considerable
      potential energy, relative to its mass, which can
      liberate that energy when suitably initiated.
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15
Q

Explain Standard Criteria for Attack on Aircraft:

A
KK-Kill = immediate and catastrophic disintegration
K-Kill = destroyed in less than 10 secs
A-Kill = destroyed in less than 5mins
B-Kill = destroyed in less than 5 hours
C-Kill = Tgt's Mission is not achieved/aborted.
E-Kill = May complete mission, needs repairs before next flight
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16
Q

3 Types of Aircraft Targets:

A
  • Slow Moving
  • Fast Moving
  • Helicopters
17
Q

7 Types of warheads to attack aircraft?

A
S - Special KE
S - Shaped Charges
S - Sub-projectiles
F -  Blast+Frag
F - Frag
B - Blast
C - Cluster
18
Q

7 Types of Armour?

A
  • Reactive (ERA)
  • Rolled Homogeneous Armour (RHA)
  • Composite (chobham)
  • Slat (bar)
  • Spaced Homogeneous
  • Ply
  • Face Hardened
19
Q

5 Armour Damage Assessment Criteria:

A
Tanks:
M - Mobility Kill
F - Fire Power Kill
K - Completely Destroyed
APC/AFV/IFV/MICV
F - Firepower Kill
P - Payload Kill
20
Q

3 Types of Fragment Producers?

A
  • Generic HE Projectiles
  • Pre notched containers
  • Pre formed fragmentation
21
Q

How can someone designing something control Frag Velocity:

A
  • Amount of explosive behind the fragment wall
  • Density of charge and VoD
  • Density of wall material
22
Q

How does HESH work?

A

When the rebounding tension wave meets further primary shock waves this exceeds the strength of the plate and a large scab is detached from the rear surface.

23
Q

What is Reverse Impact Detonation (RID)?

A
  • Detonation occurs before the fuze can produce detonation of the filling, the shock wave will be travelling in the wrong direction.
24
Q

Explain/describe Kinetic Energy Attack:

A
  • Hitting the target armour with a projectile of sufficiently high velocity to achieve penetration.
25
Q

2 Types of DS?

A

Petal and Pot (PP)

26
Q

2 Ways of stablisation and diameter ratios for each?

A

Spin: 7:1 - Length:Diameter
Fin: 15:1 - L:dia

27
Q

Define Shaped Charge:

A

A Charge shaped so as to concentrate its explosive force in a particular direction.

28
Q

How is a shaped charge achieved?

A
  • Achieved by hollowing out the front face of a slab of HE to give a conical shape.
  • the energy from the detonation of the explosive is directed inwards and forwards as gaseous jet
  • If a metal liner is placed on the front of the HE charge it will collapse and be carried forward.
29
Q

6 Types of fuel for FAE?

A
P - Propylene oxide
A - Acetylene
E - Ethylene oxide
B - Butane
A - Aluminium
K - Kerosene
30
Q

3 Types of Shot Failure?

A
  • Barreling
  • Shattering
  • Lateral Bending
31
Q

Problems with attacks of combination KE&CE

A
  • Initiating the CE source behind armour

- Due to intense shocks which any initiating mechanism is subjected to on initial impact and during penetration

32
Q

3 High Energy forms of Attack on Armour?

A
  • KE
  • CE
  • Combination
33
Q

Ways to increase/enhance penetration for KE

A
  • lengthening of Barrel
  • lengthening projectile
  • improve shot steadiness
  • rocket assist
34
Q

How much frag is wasted on aircraft attacks?

A

80%

35
Q

EFP’s have a 1CD to …. what stand off distance?

A

1:1000 CD:stand off

36
Q

4 Behind Armour Effects (BAE)

A

H - Heat / Fires
O - Overpressure
L - Luminescence
S - Spalling

37
Q

Define Deflagration:

A

Technnical term to describe subsonic combustion that usually propagates through thermal conductivity.

38
Q

Define Rarefaction:

A

The negative pressure phase following the positive phase. suction, pushing back towards the explosion site.

39
Q

Define Shattering:

A
  • Raising the hardness of a steel shot, whilst increasing its compressive str, makes it brittle
  • on impact severe tensile hoops stresses are set up in the nose of the shot
  • at high striking velocities, the shot nose can fail under these stresses and longitudinal cracks are formed