Goods & Services

Hardness testing machines; Apparatus for measuring the strength of concrete structures; Metallic material testers; Lumber testers; Textile testers; Cement testers; Compression testers; Tension testers; Concrete testers; Plastic testers

Abstract

According to the embodiments disclosed herein, in a press-fitting test for measuring physical properties of a test object by pressing an indenter against the test object and measuring the load and displacement, the measured displacement value is corrected in real time in consideration of the amount of deformation according to the load of the load cell, and thus an accurate load-displacement curve can be derived, even when the amount of deformation of the load cell is included in a measured value of a displacement sensor.

IPC Classes  ?

• G01N 3/40 - Investigating hardness or rebound hardness
• G01N 3/06 - Special adaptations of indicating or recording means
• G01N 3/08 - Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
• G01N 1/42 - Low-temperature sample treatment, e.g. cryofixation
• G01N 3/14 - Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by dead weight, e.g. pendulumInvestigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by spring tension

Abstract

Embodiments of the present invention provide an instrumented indentation test device which, when installed at an object to be tested and performing an indentation test of the object, can measure indentation depth without slippage of a displacement sensor even when the surface of the object to be tested has a curvature, can be easily installed in a chamber for providing a high-temperature environment with a specimen, and can improve the accuracy and precision of the displacement sensor.

IPC Classes  ?

• G01N 3/14 - Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by dead weight, e.g. pendulumInvestigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by spring tension
• G01B 5/18 - Measuring arrangements characterised by the use of mechanical techniques for measuring depth

Abstract

According to the embodiments disclosed herein, in a press-fitting test for measuring physical properties of a test object by pressing an indenter against the test object and measuring the load and displacement, the measured displacement value is corrected in real time in consideration of the amount of deformation according to the load of the load cell, and thus an accurate load-displacement curve can be derived, even when the amount of deformation of the load cell is included in a measured value of a displacement sensor.

IPC Classes  ?

• G01N 3/14 - Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by dead weight, e.g. pendulumInvestigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by spring tension

Abstract

The present invention relates to a method for measuring a fracture toughness using an instrumented indentation testing, which measures a load and an indentation depth in real time while applying a load to a specimen by an indenter having a flat punch shape.

IPC Classes  ?

• G01N 3/00 - Investigating strength properties of solid materials by application of mechanical stress
• G01N 3/42 - Investigating hardness or rebound hardness by performing impressions under a steady load by indentors, e.g. sphere, pyramid
• G01N 3/08 - Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces

Abstract

Provided herein is a portable apparatus for surface inspection and electrolytic polishing, the apparatus including a housing where a motor and controller are embedded. The apparatus also includes a screw axis rotatable by the motor and a cylinder with a ball nut coupled to the screw axis and coupled to a slider. A plurality of guide members are included that each have an upper end coupled to the housing and a lower end coupled to a base plate. The guide member penetrates the slider, and the slider moves up and down along the guide members with the cylinder. A surface inspector and an electrolytic polisher are coupled to the slider and move up and down together with the slider allowing the surface inspector and the electrolytic polisher to test a test subject in various industrial fields, such as machinery, construction, chemicals, and the like.

IPC Classes  ?

• C25F 7/00 - Constructional parts, or assemblies thereof, of cells for electrolytic removal of material from objectsServicing or operating
• C25F 3/16 - Polishing
• G01N 21/88 - Investigating the presence of flaws, defects or contamination

Goods & Services

Hardness testing machines; Apparatus for measuring the strength of concrete structures; Metallic material testers; Lumber testers; Textile testers; Cement testers; Compression testers; Tension testers; Concrete testers; Plastic testers

Goods & Services

Hardness testing machines; Apparatus for measuring the strength of concrete structures; Metallic material testers; Lumber testers; Textile testers; Cement testers; Compression testers; Tension testers; Concrete testers; Plastic testers

Abstract

The present invention relates to a method for evaluating a residual stress by using an instrumented indentation test technique, a storage medium storing a computer program including the same, and an indentation test apparatus for performing an instrumented indentation test by operating the storage medium, and according to an embodiment of the present invention, even if a state that a material has no residual stress does not exist, it is possible to evaluate a residual stress.

IPC Classes  ?

• G01L 1/00 - Measuring force or stress, in general
• G01N 3/42 - Investigating hardness or rebound hardness by performing impressions under a steady load by indentors, e.g. sphere, pyramid
• G01B 11/16 - Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge

Abstract

Method for evaluating an asymmetric residual stress for a material by the indentation test comprises applying the residual stresses with an uniaxial and an symmetrical biaxial tensions on the material and then performing an instrumented indentation test indenting an asymmetric indenter on the material; and comparing a slope of indentation load-depth curve when the long diagonal direction of the asymmetric indenter is perpendicular to the direction of the largest residual stress with that in stress-free state, and then a slope of indentation load-depth curve when the long diagonal direction of the asymmetric indenter is parallel to the direction of the largest residual stress with that in stress-free state, so as to evaluate the asymmetric residual stress for the material.

IPC Classes  ?

• G01N 3/08 - Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces

Abstract

Method for evaluating an asymmetric residual stress for a material by the indentation test comprises applying the residual stresses with an uniaxial and an symmetrical biaxial tensions on the material and then performing an instrumented indentation test indenting an asymmetric indenter on the material; and comparing a slope of indentation load-depth curve when the long diagonal direction of the asymmetric indenter is perpendicular to the direction of the largest residual stress with that in stress-free state, and then a slope of indentation load- depth curve when the long diagonal direction of the asymmetric indenter is parallel to the direction of the largest residual stress with that in stress-free state, so as to evaluate the asymmetric residual stress for the material.

IPC Classes  ?

• G01N 3/08 - Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
• G01N 3/00 - Investigating strength properties of solid materials by application of mechanical stress