Apparatus and method for inner cylindrical surface enhancement and compaction of a structure using glass failure generated pulse

Patent metadata

Field	Value
Publication number	US-10633718-B1
Application number	US-201715720111-A
Country	US
Kind code	B1
Filing date	Sep 29, 2017
Priority date	Sep 29, 2017
Publication date	Apr 28, 2020
Grant date	Apr 28, 2020

Abstract

An apparatus and method for hardening and compacting an inner face of a cylindrical opening of a structure. The apparatus and method is directed towards the hardening and compaction of an elongated cylindrical opening by surrounding the inner face of the cylindrical opening with a glass tube, and initiating an explosive volume expansion of the glass. This in turn, creates a compressive force that acts on the inner face to compact and harden the surface.

First claim

What is claimed is:

1. A system for hardening and compacting an inner face of a cylindrical opening of a structure, the system comprising:
a confinement assembly comprising:
a structure having an inner cylindrical opening having an inner face, with a longitudinal axis X extending through the center of the inner cylindrical opening; and
a glass tube positioned within and contacting the inner face of the cylindrical opening, the glass tube having a bore, and wherein the longitudinal axis X extends through the center of the glass tube;

a striker for striking and shattering the glass tube; and
a launching mechanism for launching the striker to create an explosive volume expansion of the glass, which results in compressive forces being applied to the inner face of the inner cylindrical opening, thereby hardening and compacting the inner face of the structure, wherein the striker is an elongated projectile and wherein the launching mechanism is positioned to launch the striker substantially parallel to the longitudinal axis X, so that the striker is launched into the bore of the glass tube, and wherein the striker has a diameter d and the bore has a diameter B, wherein the diameter d is larger than the diameter B, so that when launched into the bore, the striker shatters the glass of the glass tube to create said explosive volume expansion.

2. The system for surface hardening and compacting of claim 1 , wherein the launching mechanism comprises one of, a projectile component or an explosive charge, for launching and directing the striker towards the glass tube, so that upon shattering the glass, one or more of the following occurs;
a. multiple cracks form in the glass tube so that the volume occupied by glass in the glass tube increases as the cracks rupture and expand;
b. failure waves propagate through the glass tube, wherein kinetic energy is stored ahead of the waves;

so that the occurrences of one or more of a and b, creates said explosive volume expansion of the glass, which results in said compressive forces being applied to the cylindrical structure.

3. The system for surface hardening and compacting of claim 2 , wherein the launching mechanism comprises one of a projectile component, or an explosive charge for launching and directing the striker into the bore of the glass tube at velocities between 500 feet per second to 20,000 feet per second, so that in addition to the occurrences of one or more of a and b, the following may also occur: c. the glass sleeve develops at least one of coesite, stishovite, or seifertite which rupture and convert to an amorphous state through a volume change to create said explosive volume expansion of the glass.

4. A method of hardening and compacting an inner face of a cylindrical opening of a structure comprising:
providing a confinement assembly comprising:
a structure having an inner cylindrical opening having an inner face, with a longitudinal axis X extending through the center of the inner cylindrical opening; and
a glass tube positioned within and contacting the inner face of the cylindrical opening, the glass tube having a bore, and wherein the longitudinal axis X extends through the center of the glass tube;

providing a striker; and
providing a launching mechanism for launching the striker;
the method further comprising,
launching the striker to create an explosive volume expansion of the glass, which causes compressive forces being applied to the inner face of the inner cylindrical opening, thereby hardening and compacting the inner face of the structure, wherein the launching mechanism comprises one of, a projectile component or an explosive charge, for launching and directing the striker towards the glass tube, so that upon shattering the glass, one or more of the following occurs:
a. multiple cracks form in the glass tube so that the volume occupied by glass in the glass tube increases as the cracks rupture and expand;
b. failure waves propagate through the glass tube with kinetic energy stored ahead of the waves;
so that the occurrences of one or more of a and b, creates said explosive volume expansion of the glass, which results in said compressive forces being applied to the cylindrical structure, wherein the striker is an elongated projectile and wherein the launching mechanism is positioned to launch the striker substantially parallel to the longitudinal axis X, so that the striker is launched into the bore of the glass tube, and wherein the striker has a diameter d and the bore has a diameter B, wherein the diameter d is larger than the diameter B, so that when launched into the bore, the striker shatters the glass of the lass tube to create said explosive volume expansion.

5. The method of hardening and compacting an inner face of a cylindrical opening of a structure of claim 4 , wherein the launching mechanism comprises one of a projectile component, or an explosive charge for launching and directing the striker substantially parallel to the longitudinal axis X into the bore of the glass tube at velocities between 500 feet per second to 20,000 feet per second, so that in addition to the occurrences of one or more of a and b, the following may also occur: the glass sleeve develops at least one of coesite, stishovite, or seifertite which rupture and convert to an amorphous state through a volume change to create said explosive volume expansion of the glass.

Assignees

• Dudt Philip
• Barsoum Roshdy George
• Us Navy

Inventors

• Dudt Philip
• Barsoum Roshdy George

Classifications

• C21D7/06 Primary

  by shot-peening or the like · CPC title

• B21D26/00

  Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces (stamping using resilient pads B21D22/10) · CPC title