An amplitude detecting method and a material tester are provided. As functional blocks of a program that is installed in a personal computer and is stored in a memory, a measurement noise eliminating part that eliminates measurement noise, a vibration noise eliminating part that eliminates vibration noise assumed to be caused by an inertial force according to a natural vibration according to reach of an impact of breakage or destruction of a test piece at the entire tester, an amplitude detecting part that detects the amplitude of a natural vibration superimposed in the data period used for evaluating material characteristics, and a display control part that controls display of an amplitude value of the natural vibration and a test result on the display device are included.

The present disclosure provides a thermal-stress-pore pressure coupled electromagnetic loading triaxial Hopkinson bar system and test method, the system mainly consists of an electromagnetic pulse generation system, a servo-controlled axial pressure loading system, a servo-controlled confining pressure loading system, a thermal control system, a pore pressure loading system, a bar system, and a data monitoring and acquisition system. Based on the conventional Hopkinson bar, the present disclosure creatively introduces a real-time loading and control system for confining pressure, thermal, and pore pressure, aiming to solve the technical problem that the existing test apparatus cannot be used to study dynamic response of deep rock mass under the coupling effect of thermal-stress-pore pressure and dynamic disturbance during dynamic impact loading.

A vehicle windshield testing assembly includes a test table, a plurality of supports, a vehicle windshield, and a testing fixture. The test table is configured to be adjustable about a first axis and a second axis. The plurality of supports is movably connected to the test table. The vehicle windshield is supported by the plurality of supports. The testing fixture supported by the plurality of supports. The testing fixture includes a plurality of hollow sleeves configured to receive a testing object. Each of the hollow sleeves has an opening facing the vehicle windshield.

An impact testing machine is configured. The impact testing machine includes: a testing machine body that applies a load having a prescribed speed to a test piece and conducts a test; a controller that controls the testing machine body; a video camera that photographs the test piece; and a pulse generator. The controller includes: a detection signal capturing unit that captures a detection signal of the load in a prescribed measurement sampling period; and a synchronizing signal output unit that outputs a sampling synchronizing signal that is synchronized with the measurement sampling period. The pulse generator includes: a photographing instruction signal generator that generates a photographing instruction signal by multiplying or dividing the sampling synchronizing signal, and outputs the photographing instruction signal to the video camera. The photographing instruction signal issues a photographing instruction to the video camera.

A collision performance evaluation test with few variations in test results with high accuracy in which a complicated phenomenon that actually occurs can be reproduced in a simple manner by considering the history of deformation in both the press forming and a collision. A collision performance evaluation test method for a metal sheet material for an automobile body is characterized in that a press working apparatus first forms a flat test specimen made of a metal sheet material to be tested into a V shape by primary bending, a bending test apparatus then deforms, by secondary bending, the test specimen formed by the primary bending in a direction intersecting with the primary bending direction, and a bending load and a bending stroke for the test specimen during the secondary bending deformation are recorded and evaluated.

A system for evaluating a bond includes first and second electrodes. A dielectric material layer is positioned at least partially between the first and second electrodes. A power source is connected to the first and second electrodes. The power source is configured to cause the first and second electrodes to generate an electrical arc. The electrical arc is configured to at least partially ablate a sacrificial material layer to generate a plasma.

The invention relates to a device for ascertaining mechanical properties, for example, the natural frequency, the damping or the natural vibration mode of a test specimen containing ferromagnetic material components, in particular a brake pad for a motor vehicle. An electromagnetic actuator, in particular an electromagnet, is provided for exerting a magnetic attractive force onto the test specimen so that the actuator exerts a force impulse that imparts the test specimen with vibrations whose spectrum of vibration contains at least one natural frequency vibration of the test specimen.

A handheld quality inspection tool for projection welded components and method for utilizing the same is disclosed. The handheld quality inspection tool includes an elongated hollow tube, a spring support, a spring member, a plunger, and a handle. The elongated hollow tube defines a slot. The spring support is connected to an end portion of the elongated tube. The spring member is disposed within the elongated hollow tube and connected to the spring support. The plunger is disposed in the elongated hollow tube and connected to the spring member opposite the spring support. The handle is connected to the plunger and protrudes from the elongated hollow tube through the slot and is translatable along the slot to move the plunger and compress the spring member. Upon release of the handle, the compressed spring member propels the plunger to apply an impact force to a projection welded component.

The disclosure relates to a vertical Hopkinson pressure bar test device and a test method. The device comprises a guide cylinder, an incident bar, a transmission bar, a buffer bar and a striker, and further comprises a base; side support plates arranged vertically and upwards are provided symmetrically on two sides of the base, a horizontal first lateral support plate is provided at the top between the side support plates on the two sides, three groups of horizontal second lateral support plates are provided below the first lateral support plate sequentially between the side support plates on the two sides, and each group is provided with a clamping mechanism clamping a corresponding incident bar, transmission bar or buffer bar; the surfaces of the incident bar is pasted with a first strain gauge pad and the transmission bar is pasted with a second strain gauge pad. According to the disclosure, the striking velocity is accurately controlled to render a medium or low velocity for analyzing the dynamic mechanical properties of low-wave impedance materials such as coal and light concrete, satisfying the requirements of dynamic tests on high, medium and low velocities.

An impact slug includes a first slug segment and a second slug segment arranged in sequence along a length direction of the impact slug. The second slug segment is connected to the first slug segment.