A device (100) of characterization of the elastic properties of a friction material, comprising: a support yoke (1) having a body (2) with a monoblock structure surrounding an inner chamber (3); said inner chamber (3) being defined superiorly by a first monoblock body portion (2) or upper crossbar (4); said inner chamber (3) being defined inferiorly by a second monoblock body portion (2) or lower crossbar (5); said upper (4) and lower (5) crossbars being mutually connected by two side columns (6, 7) formed by a third and a fourth monoblock body portions (2); said monoblock body comprising at least one access opening (8) to the inner chamber (3); said upper crossbar comprising a threaded through hole (9) defining a device axis (X-X) arranged substantially orthogonal to said upper crossbar (4) and said lower crossbar (5) fully passing through the inner chamber (3); said support yoke <(1) houses, substantially completely in said inner chamber (3), a measuring column (10); said measuring column (10) comprising transmission components of a static and dynamic actions, said components being arranged not necessarily in the order indicated herein below and being mutually arranged stacked substantially along said device axis (X-X) and suitable to be packed together between said upper (4) and lower (5) crossbars so as to transmit a static or dynamic action from one and the other: a preloading screw (11) suitable to engage in said threaded through hole (9) with at least one threaded length (22) thereof to enter said inner chamber (3) according to a predetermined displacement with respect to said upper crossbar (4) along substantially said device axis (X-X) to exert, once the measuring column (10) has been packed, a predetermined static preloading action; an actuator (12) capable of exerting, substantially along said device axis (X-X) an oscillatory thrust action having a predetermined period that is also variable in time in a controlled manner; at least one load cell(13) suitable to detect the preloading action and the oscillatory thrust action exerted by said actuator; at least one specimen support portion (14) to support a specimen of material to be tested (15) suitable to receive the preloading action by the preloading screw (11) and/or the oscillatory action of the actuator (12) and to transmit it to the specimen of material to be tested (15); at least one acceleration sensor or accelerometer

Disposable or single-use sensor labels sense a parameter and record the sensed parameter having: a semi-permeable medium or substrate with a parameter-sensitive and activatable developer. The developer, when activated, exhibits a detectable manifestation of a changed state that progresses over time. The detectable manifestation of this changed state is read and recorded to log parameter change data. Further, a method of using the sensor label monitors viability of a material associated with the label, such as for freshness and security assessment that is recorded for archival or reporting or quality control purposes. A changed state is exhibited that progresses over time, associating the label with a material to be monitored and positioning same into a given environment, and the recording can track the changed state against time.

A spring performance tester and method of testing a spring are disclosed that has improved accuracy and precision over prior art spring testers. The tester can perform static and cyclic testing. The spring tester can provide validation for product acceptance as well as test for cyclic degradation of springs, such as the change in the spring rate and fatigue failure.

The present invention discloses a rapid dot matrix micro-nano impact indentation testing system. The rapid dot matrix micro-nano impact indentation testing system comprises a three-dimensional electric positioning module, wherein the three-dimensional electric positioning module comprises an XY translation stage and a Z-axis lifting stage; a dot matrix impact indentation module, wherein the dot matrix impact indentation module comprises a three-degree-of-freedom piezoelectric platform arranged on the Z-axis lifting stage, one surface of the three-degree-of-freedom piezoelectric platform is provided with a piezoelectric ceramic actuator, and one end of the piezoelectric ceramic actuator is connected to an indenter; a clamp, wherein the clamp clamps a test piece, and the test piece faces the indenter; and an imaging module, wherein the imaging module comprises a microscope lens. The system can achieve in-situ micro-nano impact indentation test and rapid dot matrix indentation, and has higher indentation precision.

Provided is a driving device for detecting mechanical characteristics and electrical characteristics of cells. A structure of the driving device includes a piezoelectric stack, a bridge-type flexible hinge mechanism, a parallel hinge mechanism, a lead screw guide rail, a stepping motor, a linear displacement sensor, a force sensor, a ceramic needle, a first electrode, a second electrode, a cell container, an XY axis displacement platform, a positioning hole, a first metal base, a second metal base, a first metal connecting plate, a second metal connecting plate, a first pre-tightening wedge, a second pre-tightening wedge, screws, and a pre-tightening screw. During the operation of the driving device, the piezoelectric stack is driven under an excitation effect of a driving electric field signal, such that the bridge-type flexible hinge mechanism stretches, and the ceramic needle is driven by the parallel flexible hinge mechanism to move downwards.

A test system includes a frame. A hydraulic actuator is mounted to the frame and is configured to support a test specimen. A piezoelectric actuator is configured to apply a force to the test specimen. A controller is configured to excite the piezoelectric actuator and provide an indication of force generated by the piezoelectric actuator by measurement of current or charge provided to the piezoelectric actuator.

The present invention relates to an in-situ micro-nano impact indentation testing instrument, falling within the technical field of material micromechanical testing. The instrument comprises a nitrogen generation module, an environmental chamber, a high/low temperature loading module, an optical-infrared in-situ monitoring module, an electromagnetic-piezoelectric coupling impact module, etc. After the nitrogen is introduced into the environmental chamber and the test area is determined by microscopic imaging, the electromagnetic-piezoelectric coupling impact module can drive an indenter to indent a specimen. An acoustic emission sensor embedded in the high/low temperature loading module can monitor the surface crack propagation of the specimen. The optical-infrared in-situ monitoring module can perform real-time high-speed optical imaging and infrared imaging on the impact indentation process. The present invention can perform micro-nano impact indentation testing on the material at high or low temperatures.

The present invention provides a micro-nano impact indentation testing device and method based on cyclic refrigeration, and relates to the technical field of material property testing. The testing device comprises a pressure rod and a stage for low-temperature micro-nano impact indentation testing, and a refrigeration device for refrigerating and cooling the pressure rod and the stage, wherein the refrigeration device refrigerates the pressure rod and the stage by adopting an embedded channel, a cold conduction wire connected to the pressure rod and the stage and a refrigeration balancer in contact with the cold conduction wire are arranged between the pressure rod and the stage, and the temperature of the pressure rod and the temperature of the stage are stabilized at a common temperature point by the cold conduction wire and the refrigeration balancer together.

Various embodiments of the teachings herein include a method for quality testing an electronic assembly. An example includes: examining a component part of the electronic assembly including generating a electrical signal and exciting the examined component part using ultrasonic waves; evaluating resulting alterations in the electrical signal of using signal analysis; and determining material changes in the component part based on the evaluation.

A method and device for electro-thermo-mechanical tensile testing of wires is disclosed. The device includes a sample frame having upper and lower parts, with the upper part coupled to the lower part through a plurality of sacrificial supports, the upper and lower parts each having an electrical contact pad. The upper and lower parts are electrically non-conductive. The device also includes a wire sample with tracking beads, the wire sample affixed to the upper and lower parts such that the electrical contact pads of the upper and lower parts are communicatively coupled through the wire sample. The device also includes a piezo actuator coupled to the upper part, a weight coupled to the lower part, a power supply configured to pass a current through the wire sample, an electronic balance beneath the weight, and a digital camera pointed at the tracking beads of the wire sample.