Aerospace & Defense Technology - February 2021 - 23

Aerospace Manufacturing

To penetrate bunkers made from
UHPC, a new composite case has been
designed having the following improvements compared to a monolithic case:
* Super-strength
materials
with
strength of >400 ksi (2,750 MPa);
* Nose made from joined super-strength
materials with a complex shape;
* Walls made from high-strength and
high-impact toughness materials;
* Walls incorporate reinforced components to increase general, and bending, stiffness and reduce dynamic vibration of the walls;
* The nose and walls are joined by a
special manufacturing technique;
* Uniform distribution of weight through
the length of the case to supply dynamic stability;
* High wear-resistance of the composite case.
The composite case has the same
weight and the same capacity for explosive materials as the new monolithic
case and the standard case, while the
projected cost of production of the
composite case is 10-20% higher. The
composite case is applicable for the
BLU-122, BLU-109, and BLU-137/B penetrators, MOP, and HVPW to pierce
bunkers made from UHPC.
An alternate manufacturing process of
producing the penetrators and projectiles
has been developed to reduce manufacturing cost, improve the manufacturing
consistency, and tolerance control.
The method of production includes
but is not limited to the following steps:
* Piercing a workpiece to complete the
preform stage;
* The hot ring preform is placed on a
mandrel in preparation for forging
under the press;
* The forging is drawn down and elongates over the mandrel;
* The nose of the case is formed by the
closed die forging;
* Planishing to smooth the outside surface.
The proposed technology could be
commercially used for fabrication of
any metallic axisymmetric items such as
variable-diameter tubing and support
poles. Other potential applications include aerospace and power generation
systems.

PICO

Summary
A new monolithic case design for
penetrators and projectiles has been developed to increase penetration distance. Projected penetration distance of
the BLU-122 penetrator with the new
monolithic case made from MilitarySteel in 5.0 ksi (34.5 MPa) strength reinforced concrete is 40% higher than the
penetration distance of the standard
case made from ES-1.
Alternatively, a new design for composite cases of penetrators and projectiles
has been developed to penetrate an ultrahigh-performance concrete (UHPC). The
composite cases provide projected penetrability in UHPC with a compression
strength of >20 ksi (138 MPa) and a thickness of >20 ft (6m). The composite cases
could be utilized for different types of
penetrators, including BLU-122, BLU109, BLU-137/B, MOP, high velocity
HVPW, and projectiles. In addition, an alternate manufacturing process for producing the penetrators and projectiles
has been developed to reduce manufacturing cost as well as improve the manufacturing consistency and tolerance
control.
This article was written by Dr. Gregory
Vartanov, Advanced Materials Development Corp. (Toronto, Canada). For more
information, visit http://info.hotims.com/
79410-503.
References
[1] Dilmore, Morris; Rahlman, James D.:
" EGLIN STEEL-A LOWALLOY HIGH
STRENGTH COMPOSITION " , U.S.
patent No 7,537,727
[2] Abrahams, Rachel Ann: " Low alloy
high performance steel " , U.S. patent
No 10,450,621
[3] Vartanov, Gregory: " High Strength
Military Steel " , U.S. patent No
8,414,713
[4] U.S. Air Force Research Laboratory at
Eglin AFB: " Low Alloy, High Impact
Toughness Steel " , TechLink, 2019
[5] Vartanov, Gregory: " A new design for a
better bunker buster " , DSIAC Journal,
Volume 5, Number 1, Winter 2018,
p.p. 13-14
[6] Vartanov Gregory: " New Design of
Deep Penetrating Bomb " : Military
Technology Magazine, Vol. XLIII, Issue
7-8, 2019, p. 34
[7] Michael Schmidt and Ekkehard
Fehling " Ultra-High-Performance
Concrete: Research, Development and
Application in Europe " : January 2005;
https://www.researchgate.net/publicati
on/264879054

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http://info.hotims.com/79410-781 http://info.hotims.com/79410-503 https://www.researchgate.net/publication/264879054 http://www.aerodefensetech.com http://www.abpi.net/ntbpdfclicks/l.php?202102ADTNAV

Aerospace & Defense Technology - February 2021

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