A fracture toughness testing machine of the invention makes it possible to evaluate fracture toughness of a specimen in pure mode such that the effect of thermal residual stresses is removed, when the stresses are present in the specimen obtained by bonding dissimilar materials. The testing machine includes: testing-load applying means for applying a predetermined testing load to the specimen, in which the stresses are present; and cancelling-load applying means for applying a cancelling load to the specimen to cancel the stresses therein. The cancelling-load applying means includes: a pressing-force applying portion that applies a pressing force to the specimen as the canceling load; and a pressing-force determining portion that determines magnitude of the force. The pressing-force determining portion calculates the magnitude of the force using pre-stored equations so that an energy release rate related to in-plane shear mode crack deformation becomes zero.

A mechanical testing system having a frame, and a stage for holding a sample. An arm for pressing a tool against a surface of the sample. A primary actuator is connected to the frame and applies a primary force and drives the tool relative to the sample, thereby causing the frame to flex. A displacement sensor measures a displacement value comprised of two components, the first component including a distance traveled by the probe into the sample as the primary force is applied, and the second component including a measure of a degree of flex of the frame as the primary force is applied. A compensating actuator is connected to the frame and applies a compensating force that reduces the second component of the displacement value.

A rock mechanics triaxial testing machine includes an outer pressure chamber and an inner pressure chamber located inside the outer pressure chamber, and a side wall of the inner pressure chamber is provided with a communication hole communicating with the outer pressure chamber; an upper pressure head and a lower pressure head which may be placed inside the inner pressure chamber; an axial pressure driving member, the axial pressure driving member may drive the upper pressure head and lower pressure head to approach each other to squeeze the rock sample; an axial deformation sensor, a radial deformation sensor, a lifting mechanism, the lifting mechanism may drive the inner pressure chamber to rise and fall. In the rock mechanics triaxial testing machine, the inner pressure chamber and the outer pressure chamber are nested indoors and outdoors, and the inner pressure chamber is used to quickly mount rock test samples.

Novel markers that can be attached physically to a tensile specimen with a center guide to allow for measuring correct strain, as well as a binder that fixes and holds a pin guide to its location on the specimen during the test.

A rock mechanics triaxial testing machine includes an outer pressure chamber and an inner pressure chamber located inside the outer pressure chamber, and a side wall of the inner pressure chamber is provided with a communication hole communicating with the outer pressure chamber; an upper pressure head and a lower pressure head which may be placed inside the inner pressure chamber; an axial pressure driving member, the axial pressure driving member may drive the upper pressure head and lower pressure head to approach each other to squeeze the rock sample; an axial deformation sensor, a radial deformation sensor, a lifting mechanism, the lifting mechanism may drive the inner pressure chamber to rise and fall. In the rock mechanics triaxial testing machine, the inner pressure chamber and the outer pressure chamber are nested indoors and outdoors, and the inner pressure chamber is used to quickly mount rock test samples.

A friction test device based on a torsional Hopkinson bar (THB) includes a base, a baffle, and pull rods. The servo axial loading device includes a first oil pressure tank and a first pressure rod. One end of the first pressure rod is embedded in the first oil pressure tank. The baffle includes a front baffle and a rear baffle. The pull rods are arranged between the front baffle and the rear baffle. A loading guide rod is provided between the front baffle and the rear baffle. The rear baffle is fixed thereon with a constraint mass. The loading guide rod includes one end connected to the first pressure rod and the other end connected to the constraint mass through a specimen. The friction test device further includes a torque application device and a torque storage device. Therefore, the specimen undergoes a full friction process from static to dynamic.

An apparatus includes a portable device, which includes a connector configured to contact or grasp a portion of a component and to apply a force on the component during a pull test of the component. The portable device also includes a handle configured to be pulled to apply the force on the component during the pull test of the component. The portable device further includes an indicator configured to at least one of: (i) identify the force being applied to the component during the pull test and (ii) identify when a specified amount of force has been applied to the component during the pull test.

A method and an apparatus for detecting bending stiffness and a method for testing a display panel. The method for detecting bending stiffness includes: arranging an object to be tested on a reference surface to make a stationary portion and a rotating portion of the object to be tested attached to the reference surface, the stationary portion and the rotating portion being connected to each other; driving the rotating portion to bend from the reference surface toward the stationary portion, and acquiring a rotation angle between the rotating portion and the reference surface; acquiring a bending force received by the rotating portion when the rotating portion is bent from the reference surface toward the stationary portion; and determining bending stiffness of the object to be tested on the basis of the bending force and the rotation angle.

A method for quantitatively measuring a physical characteristic of a material includes applying a force to a material sample according to an interrogation profile comprising a set of one or more interrogation parameters. The method further includes measuring a displacement over time of the material sample that occurs as a result of applying the force according to the interrogation profile. The method further includes using the interrogation profile and the measured displacement over time of the material sample to derive a quantitative value of a physical characteristic of the material sample.

A device for testing impact resistance includes: a shrink film supporting member, disposed on a horizontal platform, and including a main body, a supporting part, and fixing parts disposed on a sidewall of the main body, the supporting part is configured to support a tested shrink film, the plurality of fixing parts is sequentially disposed in parallel at positions of different heights on the sidewall of the main body, and the fixing parts disposed at the positions of different heights represent different impact resistance levels; a level plate, detachably fixed inside the main body by means of any one of the plurality of fixing parts; and an impact member, configured to move downward from a position above a geometric center of the supporting part at a preset speed to exert a frontal impact on the shrink film supported on the supporting part.