Abstract: A chamber having a water jet generation apparatus and a mesh installed inside is pushed against a surface of a peening object. A rotary vane of the water jet generation apparatus, disposed in a region in the chamber between the mesh and the chamber, is rotated to generate a water jet flowing toward the peening object in one region in the chamber, the one region is a region closer to the peening object than the mesh. A plurality of shots 4 put in the region 30A moves toward the peening object along with the water jet and collides with the surface of the peening object. After the collision, the shots move toward the mesh along with the water jet. Compression residual stress is given to the surface of the peening object with which the shots have collided. Thus, spreading of contaminants peeled off from a peening object can be prevented.

Abstract: There is provided an X-ray diffraction instrument including: a two-dimensional plate-like X-ray detector; an X-ray emitter integrated with the X-ray detector so as to penetrate the plate of the X-ray detector; a cylinder-like shield to define an orientation of the X-ray emitter and to prevent X-ray leakage, the X-ray detector being attached to one open end of the cylinder-like shield; and a standard powder attachment device to attach a standard powder for X-ray diffraction measurement to a surface of an object to be measured. The X-ray diffraction instrument can perform an X-ray diffraction measurement to an object larger than the X-ray detector thereof. The invented X-ray diffraction instrument is small in size, and can perform accurate X-ray diffraction measurement of stationary immovable objects without limitation on an orientation of the measurement surface. In addition, X-ray leakage is prevented for operator safety.

Abstract: An evaluation method of residual stress in water jet peening includes a step of creating an analytical model including meshes according to a water jet peening (WJP) object, the shape of a nozzle, and an injection distance, a step of inputting WJP execution conditions, a step of calculating the internal pressure pBi of a cavitation bubble and a bubble number density ngi through jet flow analysis for a jet flow jetting from the nozzle, a step of calculating cavitation energy according to the internal pressure pBi of a cavitation bubble and a bubble number density ngi (S4), a step of calculating the burst energy of cavitation bubbles from the cavitation energy C, and a step of calculating the compressive residual stress of the WJP object from the collapse pressure of cavitation bubbles. Accordingly, the residual stress of the WJP object can be evaluated precisely in a shorter time.

Abstract: A chamber having a water jet generation apparatus and a mesh installed inside is pushed against a surface of a peening object. A rotary vane of the water jet generation apparatus, disposed in a region in the chamber between the mesh and the chamber, is rotated to generate a water jet flowing toward the peening object in one region in the chamber, the one region is a region closer to the peening object than the mesh. A plurality of shots 4 put in the region 30A moves toward the peening object along with the water jet and collides with the surface of the peening object. After the collision, the shots move toward the mesh along with the water jet. Compression residual stress is given to the surface of the peening object with which the shots have collided. Thus, spreading of contaminants peeled off from a peening object can be prevented.

Abstract: There is provided an X-ray diffraction instrument including: a two-dimensional plate-like X-ray detector; an X-ray emitter integrated with the X-ray detector so as to penetrate the plate of the X-ray detector; a cylinder-like shield to define an orientation of the X-ray emitter and to prevent X-ray leakage, the X-ray detector being attached to one open end of the cylinder-like shield; and a standard powder attachment device to attach a standard powder for X-ray diffraction measurement to a surface of an object to be measured. The X-ray diffraction instrument can perform an X-ray diffraction measurement to an object larger than the X-ray detector thereof. The invented X-ray diffraction instrument is small in size, and can perform accurate X-ray diffraction measurement of stationary immovable objects without limitation on an orientation of the measurement surface. In addition, X-ray leakage is prevented for operator safety.

Abstract: An evaluation method of residual stress in water jet peening includes a step of creating an analytical model including meshes according to a water jet peening (WJP) object, the shape of a nozzle, and an injection distance, a step of inputting WJP execution conditions, a step of calculating the internal pressure pBi of a cavitation bubble and a bubble number density ngi through jet flow analysis for a jet flow jetting from the nozzle, a step of calculating cavitation energy according to the internal pressure pBi of a cavitation bubble and a bubble number density ngi (S4), a step of calculating the burst energy of cavitation bubbles from the cavitation energy C, and a step of calculating the compressive residual stress of the WJP object from the collapse pressure of cavitation bubbles. Accordingly, the residual stress of the WJP object can be evaluated precisely in a shorter time.

Abstract: A method for executing water jet peening for giving an impact force to a surface of a structure member by a crushing pressure of a water jet and cavitation and improving residual stress, or washing, or reforming said surface, wherein said water jet peening is executed so as to make a natural frequency of oscillation of said structure member and a excitation frequency of oscillation of water jet peening different from each other.

Abstract: A method for executing water jet peening for giving an impact force to a surface of a structure member by a crushing pressure of a water jet and cavitation and improving residual stress, or washing, or reforming said surface, wherein said water jet peening is executed so as to make a natural frequency of oscillation of said structure member and a excitation frequency of oscillation of water jet peening different from each other.

Abstract: The present invention relates to a system and method for providing information on secondary batteries for power storage to an electric power consumer in order to determine whether or not a secondary battery should be installed. A communication terminal (Internet terminal) sends to a consumer information including inquiries on electric power used by the consumer, and/or inquiries on limitations of an area and a height of a site usable for installation of a secondary battery at the location of the electric power consumer.