Water jet peening compressive residual stress test method, test device, and test facility

Patent metadata

Field	Value
Publication number	US-9739695-B2
Application number	US-201414766559-A
Country	US
Kind code	B2
Filing date	Feb 10, 2014
Priority date	Feb 12, 2013
Publication date	Aug 22, 2017
Grant date	Aug 22, 2017

Abstract

A plastically deformable almen strip is held under a predetermined underwater environment in which water jet peening is carried out, and a result of providing compressive residual stress in the water jet peening is confirmed by jetting water jet to the almen strip.

First claim

The invention claimed is:

1. A water jet peening compressive residual stress test method comprising:
holding a plastically deformable Almen strip in a predetermined underwater environment; and
jetting water jet to the Almen strip, wherein
the water jet peening compressive residual stress test method is performed in a water jet peening compressive residual stress test facility comprising:
a water tank that creates the predetermined underwater environment;
a high-pressure water supply pipe configured to supply high-pressure water;
a high-pressure water pump configured to send the high-pressure water to the high-pressure water supply pipe; and
a water jet peening compressive residual stress test device arranged in the underwater environment of the water tank and connected to the high-pressure water pump via the high-pressure water supply pipe, wherein

the water jet peening compressive residual stress test device comprises:
a jet port mounting portion to which a jet port is mounted, the jet port being configured to jet the water jet;
a high-pressure water pipe mounting portion provided communicating into the jet port mounting portion, and to which the high-pressure water supply pipe is mounted; and
an Almen strip holding portion including a support surface facing the jet port mounting portion, and an attaching portion configured to allow a plate surface of the plastically deformable plate-like Almen strip to be in contact with and attached to the support surface, wherein

the attaching portion includes:
a pressing member including a through hole through which a portion of the Almen strip, to which the water jet is configured to be jetted, is exposed, and a pressing surface configured to abut on an outer edge of the Almen strip; and
a fixing member configured to fix the pressing member to sandwich the Almen strip between the pressing surface of the pressing member and the support surface of the Almen strip holding portion, wherein

a recessed portion configured to allow the Almen strip to be inserted to surround whole circumference of the Almen strip which is provided in at least one of the support surface of the Almen strip holding portion and the pressing surface of the pressing member.

2. The water jet peening compressive residual stress test method according to claim 1 , further comprising:
providing the underwater environment by putting water in the water tank to be sealed and pressurizing the sealed water tank.

3. A water jet peening compressive residual stress test device comprising:
a jet port mounting portion to which a jet port is mounted, the jet port jetting water jet;
a high-pressure water pipe mounting portion provided communicating into the jet port mounting portion, and to which a high-pressure water supply pipe is mounted, the high-pressure water supply pipe supplying high-pressure water; and
an Almen strip holding portion including a support surface facing the jet port mounting portion, and an attaching portion configured to allow a plate surface of a plastically deformable plate-like Almen strip to be in contact with and attached to the support surface, wherein
the attaching portion includes:
a pressing member including a through hole through which a portion of the Almen strip, to which the water jet is configured to be jetted, is exposed, and a pressing surface configured to abut on an outer edge of the Almen strip; and
a fixing member configured to fix the pressing member to sandwich the Almen strip between the pressing surface of the pressing member and the support surface of the Almen strip holding portion, wherein

a recessed portion configured to allow the Almen strip to be inserted to surround whole circumference of the Almen strip which is provided in at least one of the support surface of the Almen strip holding portion and the pressing surface of the pressing member.

4. The water jet peening compressive residual stress test device according to claim 3 , wherein
the support surface except areas on which the attaching portion is attached has an area broader than an effective range where the water jet acts, and the attaching portion allows the Almen strip to be attached.

5. The water jet peening compressive residual stress test device according to claim 3 , further comprising:
a test piece holding portion provided in parallel to the Almen strip holding portion, and configured to hold a test piece that produces residual stress with the water jet.

6. The water jet peening compressive residual stress test device according to claim 3 , further comprising:
a block portion configured to block a space between the Almen strip holding portion and the jet port mounting portion; and
an opening/closing mechanism configured to move the block portion to open/close the space between the Almen strip holding portion and the jet port mounting portion.

7. The water jet peening compressive residual stress test device according to claim 3 , further comprising:
a slide-moving mechanism configured to slide and move the jet port mounting portion and the high-pressure water pipe mounting portion in a direction perpendicular to a direction into which the jet port mounted to the jet port mounting portion faces.

8. A water jet peening compressive residual stress test facility comprising:
a water tank which creates a predetermined underwater environment; and
a high-pressure water pump configured to send high-pressure water to the high-pressure water supply pipe that supplies the high-pressure water; and
the water jet peening compressive residual stress test device according to claim 3 arranged in the underwater environment of the water tank and connected to the high-pressure water pump via the high-pressure water supply pipe.

9. The water jet peening compressive residual stress test facility according to claim 8 , further comprising:
a sealing means configured to seal an inside of the water tank; and
a pressurizing means configured to pressurize the inside of the sealed water tank.

Assignees

• Mitsubishi Heavy Ind Ltd

Inventors

• Michishita Yukio
• Ota Takahiro
• Hori Nobuyuki

Classifications

• G21C17/001

  Mechanical simulators (electrical or magnetic simulators G06G7/54) · CPC title

• G21C17/01

  Inspection of the inner surfaces of vessels · CPC title

• G21C19/28

  Arrangements for introducing fluent material into the reactor core; Arrangements for removing fluent material from the reactor core (pumping coolant G21D) · CPC title

• G01L5/0052 Primary

  measuring forces due to impact (G01L5/0061, G01L5/14 take precedence; impact testing of structures G01M7/08; impact testing of material G01N3/00) · CPC title

• B23P9/04

  Treating or finishing by hammering or applying repeated pressure · CPC title