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

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.