A method for characterizing propagation of metallic short cracks and long cracks includes: acquiring crack tip opening displacement in a metallic notched sample under cyclic loading; acquiring crack tip opening displacement amount caused by a single monotonic tensile in the notched sample, and crack tip opening displacement caused by monotonic tensile in the notched sample under a maximum far-field stress; and based on an original Shyam model, constructing, according to the crack tip opening displacement amount and the crack tip opening displacement by obtaining yield strength of metals, a T.sub.m.sub.c model for characterizing the propagation of short cracks and long cracks, where the T.sub.m.sub.c model is used for representing the growth rate of short cracks and long cracks.

A method for characterizing propagation of metallic short cracks and long cracks includes: acquiring crack tip opening displacement in a metallic notched sample under cyclic loading; acquiring crack tip opening displacement amount caused by a single monotonic tensile in the notched sample, and crack tip opening displacement caused by monotonic tensile in the notched sample under a maximum far-field stress; and based on an original Shyam model, constructing, according to the crack tip opening displacement amount and the crack tip opening displacement by obtaining yield strength of metals, a T.sub.m.sub.c model for characterizing the propagation of short cracks and long cracks, where the T.sub.m.sub.c model is used for representing the growth rate of short cracks and long cracks.

A method and system to develop the age and history of a crack by exposing a specimen or component to varying predetermined temperature range that covers the designated service temperatures and measuring the thickness of the oxide across the specimen along the thickness direction.

A method for testing for hydrogen embrittlement, including mounting a container around a steel alloy test specimen, the container having a closed bottom below a notched area on the test specimen and an open upper end above the notched area; applying a tensile load to the test specimen and sustaining the load for a selected duration to incubate potential hydrogen embrittlement cracks with a sub-critical flaw size if sufficient hydrogen in dangerous levels is present in the test specimen; then, while sustaining the load, dispensing a cryogenic fluid into the container, immersing and chilling the notched area, reducing the sub-critical flaw size for any hydrogen embrittlement cracks incubated; and with the sustained load, fracturing the notched area if the sub-critical flaw size of any hydrogen embrittlement cracks incubated reaches a critical flaw size.

A nondestructive inspection method includes steps of: (1) forming a first inspection standard using a metal injection molding process; (2) forming a second inspection standard using the metal injection molding process; and (3) creating a reference library that includes the first and the second inspection standards. The first inspection standard includes a first crack, induced by at least one of a thermal shock and a thermal stress. The second inspection standard includes a second crack, induced by at least one of the thermal shock and the thermal stress. At least one of the thermal shock and the thermal stress introduced during a sintering operation for the first inspection standard is different than at least one of the thermal shock and the thermal stress introduced during the sintering operation for the second inspection standard. The first crack and the second crack are different.

A nondestructive inspection method includes steps of: (1) forming a first inspection standard using a metal injection molding process; (2) forming a second inspection standard using the metal injection molding process; and (3) creating a reference library that includes the first and the second inspection standards. The first inspection standard includes a first crack, induced by at least one of a thermal shock and a thermal stress. The second inspection standard includes a second crack, induced by at least one of the thermal shock and the thermal stress. At least one of the thermal shock and the thermal stress introduced during a sintering operation for the first inspection standard is different than at least one of the thermal shock and the thermal stress introduced during the sintering operation for the second inspection standard. The first crack and the second crack are different.

An example method for identifying an internal flaw in a part produced using additive manufacturing includes calculating a proof load of a part, in which the proof load is a load that when applied to the part will cause the part to fail based on presence of an internal flaw in the part, determining whether the part can withstand the proof load based on a geometry of the part and static strength data, and based on a determination that the part can withstand the proof load, applying the proof load to the part during a compliance test of the part. The proof load causes the part to fracture, when applied to the part, based on presence of the internal flaw in the part that is of a threshold size at which the internal flaw would cause cracking and potential part failure when the part is placed under the operational load.

A shape sensor is provided for acquiring a shape profile along an extension direction of an existing weld bead, and a control unit includes a welding information acquisition unit for acquiring welding information during formation of an adjacent weld bead when forming the adjacent weld bead at a position adjacent to the existing weld bead, and a defect candidate extraction unit for determining an angle characteristic portion having a base angle equal to or greater than a threshold in the existing weld bead based on the shape profile, determining a welding characteristic portion of the welding information based on the welding information, and extracting the welding characteristic portion corresponding to the angle characteristic portion as a defect candidate by associating the welding characteristic portion with the angle characteristic portion.

A shape sensor is provided for acquiring a shape profile along an extension direction of an existing weld bead, and a control unit includes a welding information acquisition unit for acquiring welding information during formation of an adjacent weld bead when forming the adjacent weld bead at a position adjacent to the existing weld bead, and a defect candidate extraction unit for determining an angle characteristic portion having a base angle equal to or greater than a threshold in the existing weld bead based on the shape profile, determining a welding characteristic portion of the welding information based on the welding information, and extracting the welding characteristic portion corresponding to the angle characteristic portion as a defect candidate by associating the welding characteristic portion with the angle characteristic portion.

The present application provides a device for detecting a defect in a steel cord ply. The device is configured to obtain an enhanced magnetic field signal of the steel cord ply and detect a defect of the steel cord ply based on the enhanced magnetic field signal. The device includes a magnetic field unit including a permanent magnet configured to generate a background magnetic field; a signal obtaining unit configured to generate an enhanced magnetic field signal of a steel cord ply based on a plurality of first magnetic field signals and a plurality of second magnetic field signals; and a defect detecting unit configured to detect a defect of the steel cord ply based on the enhanced magnetic field signal, wherein the defect detecting unit includes an AD converting module, a signal processing module, a defect detecting module, a display module, and a control module.