Whether an internal defect is present in an inspection target is readily judged. Provided is an inspection method for an inspection target that is a layered structure including an FRP material and/or a structure made of resin, the method including the steps of: tapping, with a tapping tool, an inspection target area on a surface of the inspection target; detecting, by an accelerometer mounted to the tapping tool, an acceleration signal corresponding to acceleration of the tapping tool due to reaction force against the tapping; recording waveform data about the detected acceleration signal; creating a contour map corresponding to the inspection target area, based on the recorded waveform data; displaying the contour map on a display unit; and judging whether an internal defect is present in the inspection target, based on the contour map displayed on the display unit.

Whether an internal defect is present in an inspection target is readily judged. Provided is an inspection method for an inspection target that is a layered structure including an FRP material and/or a structure made of resin, the method including the steps of: tapping, with a tapping tool, an inspection target area on a surface of the inspection target; detecting, by an accelerometer mounted to the tapping tool, an acceleration signal corresponding to acceleration of the tapping tool due to reaction force against the tapping; recording waveform data about the detected acceleration signal; creating a contour map corresponding to the inspection target area, based on the recorded waveform data; displaying the contour map on a display unit; and judging whether an internal defect is present in the inspection target, based on the contour map displayed on the display unit.

The invention relates to an impact compactor (10) and to a method and system of obtaining an indication of the soil strength of soil (100) by using an impact compactor (10). The impact compactor (10) includes a chassis 5 structure (12), at least one wheel (14) supportively mounted on the chassis structure (12), and at least one impact drum (16) which is displaceable relative to the chassis structure (12). The method includes travelling with the impact compactor (10) over a soil surface (100) while the drum (16) is in a raised position in which it is spaced from the soil surface (100) and 10 measuring, by using a measuring arrangement (20) which is connected to or forms part of the impact compactor (10), a rut depth (54) of a rut in the soil surface (100) which is formed by the wheel (14) as the impact compactor (10) travels over the soil surface (100).

The invention relates to an impact compactor (10) and to a method and system of obtaining an indication of the soil strength of soil (100) by using an impact compactor (10). The impact compactor (10) includes a chassis 5 structure (12), at least one wheel (14) supportively mounted on the chassis structure (12), and at least one impact drum (16) which is displaceable relative to the chassis structure (12). The method includes travelling with the impact compactor (10) over a soil surface (100) while the drum (16) is in a raised position in which it is spaced from the soil surface (100) and 10 measuring, by using a measuring arrangement (20) which is connected to or forms part of the impact compactor (10), a rut depth (54) of a rut in the soil surface (100) which is formed by the wheel (14) as the impact compactor (10) travels over the soil surface (100).

The present invention provides a testing and characterization method for an initial fatigue damage and development process of vulcanized rubber, and falls within the technical field of rubber. The testing and characterization method comprises the following steps: preparing vulcanized rubber; preparing test samples; preparing fatigue testing specimens; and characterizing an initial fatigue damage and development process. The testing and characterization method provided by the present invention is simple, and closely associates a simple and easy-to-implement macro mechanical property test with changes of an internal microstructure, which are difficult to observe and analyze; and the method is high in efficiency and easy for operation and data collection, and data measured has good reference.

The present invention provides a testing and characterization method for an initial fatigue damage and development process of vulcanized rubber, and falls within the technical field of rubber. The testing and characterization method comprises the following steps: preparing vulcanized rubber; preparing test samples; preparing fatigue testing specimens; and characterizing an initial fatigue damage and development process. The testing and characterization method provided by the present invention is simple, and closely associates a simple and easy-to-implement macro mechanical property test with changes of an internal microstructure, which are difficult to observe and analyze; and the method is high in efficiency and easy for operation and data collection, and data measured has good reference.

A sliding apparatus for durability evaluation of a flexible material includes a base unit having a folding space formed therethrough, a sliding unit which is coupled to the base unit to be slidably movable and to which one side of a flexible material to be evaluated is fixed, and a folding unit which is arranged to be apart from the sliding unit, to which the other side of the flexible material is fixed, and which rotates with respect to the sliding unit to in-fold or out-fold the flexible material in an unfolded state. The sliding unit changes the position of the bent portion formed in the flexible material as the sliding unit slidably moves on the base unit with the flexible material in an in-folded state or out-folded state.

A sliding apparatus for durability evaluation of a flexible material includes a base unit having a folding space formed therethrough, a sliding unit which is coupled to the base unit to be slidably movable and to which one side of a flexible material to be evaluated is fixed, and a folding unit which is arranged to be apart from the sliding unit, to which the other side of the flexible material is fixed, and which rotates with respect to the sliding unit to in-fold or out-fold the flexible material in an unfolded state. The sliding unit changes the position of the bent portion formed in the flexible material as the sliding unit slidably moves on the base unit with the flexible material in an in-folded state or out-folded state.

The present invention relates to a metal foil fatigue test apparatus and a metal foil fatigue test method using the same. The metal foil fatigue test apparatus includes: a metal foil moving unit including an unwinding roll, from which a metal foil is unwound, a plurality of guide rolls configured to support and transfer the metal foil supplied from the unwinding roll, and a rewinding roll where the metal foil transferred from the guide rolls is wound; and a tensile strength measuring unit configured to measure tensile strength of the metal foil.

The present invention relates to a metal foil fatigue test apparatus and a metal foil fatigue test method using the same. The metal foil fatigue test apparatus includes: a metal foil moving unit including an unwinding roll, from which a metal foil is unwound, a plurality of guide rolls configured to support and transfer the metal foil supplied from the unwinding roll, and a rewinding roll where the metal foil transferred from the guide rolls is wound; and a tensile strength measuring unit configured to measure tensile strength of the metal foil.