A drop test device includes a clamp that grips a falling body and that drops the falling body by releasing, by a predetermined operation, a gripping force applied to the falling body and an impact plate having an impact surface with which the falling body collides. The falling body includes a display module that operates in a first mode and a second mode and a jig to which the display module is coupled. The jig includes a first jig to which the display module in the first mode is coupled and a second jig to which the display module in the second mode is coupled.

A drop test device includes a clamp that grips a falling body and that drops the falling body by releasing, by a predetermined operation, a gripping force applied to the falling body and an impact plate having an impact surface with which the falling body collides. The falling body includes a display module that operates in a first mode and a second mode and a jig to which the display module is coupled. The jig includes a first jig to which the display module in the first mode is coupled and a second jig to which the display module in the second mode is coupled.

This patent describes devices and methods to evaluate and compare the effectiveness of protective equipment in providing protection to players of contact sports, and to determine if a given protective product (pad) is compliant with a specified performance standard. To simulate the impacts experienced by these players, a pad-protected specially modified and instrumented manikin is impacted with solid loads of various weights at various speeds. The impacts are designed to model the impact forces and impact times encountered in typical game collisions. For each impact, measurements are made of the force exerted onto the pad, and the parts of this force that are transmitted through the pad onto various locations on the manikin, as a function of time. Five numbers that quantify the ability of each pad to protect the user are extracted from these measured force verses time data: (1) the maximum force applied on the pad, (2) the average applied force, (3) the maximum force measured under the pad, (4) the sum of the maximum forces measured under the pad, and (5) the ratio of the rebound load speed and the incident load speed. For a given impact, the pad that reduces the magnitudes of these quantities the most is the pad that provides the greatest measure of safety for the game players.

This patent describes devices and methods to evaluate and compare the effectiveness of protective equipment in providing protection to players of contact sports, and to determine if a given protective product (pad) is compliant with a specified performance standard. To simulate the impacts experienced by these players, a pad-protected specially modified and instrumented manikin is impacted with solid loads of various weights at various speeds. The impacts are designed to model the impact forces and impact times encountered in typical game collisions. For each impact, measurements are made of the force exerted onto the pad, and the parts of this force that are transmitted through the pad onto various locations on the manikin, as a function of time. Five numbers that quantify the ability of each pad to protect the user are extracted from these measured force verses time data: (1) the maximum force applied on the pad, (2) the average applied force, (3) the maximum force measured under the pad, (4) the sum of the maximum forces measured under the pad, and (5) the ratio of the rebound load speed and the incident load speed. For a given impact, the pad that reduces the magnitudes of these quantities the most is the pad that provides the greatest measure of safety for the game players.

A drop tower apparatus and method of use is provided. The drop tower apparatus includes a base, a frame, a top member, rails, a sled, a triggering system, and a test fixture. The frame extends from the base. The top member is disposed on the frame opposite the base and has a winch. The rails extend from the base to the top member and are disposed within the frame. The sled is configured to slide vertically along the length of the rails and is releasably connected to the winch of the top member. The test fixture is configured to receive a sample for testing. The winch of the top member raises the sled to a desired height, the sled is released at the desired height and slides along the rails resulting in an impact on a sample placed in the test fixture.

A drop tower apparatus and method of use is provided. The drop tower apparatus includes a base, a frame, a top member, rails, a sled, a triggering system, and a test fixture. The frame extends from the base. The top member is disposed on the frame opposite the base and has a winch. The rails extend from the base to the top member and are disposed within the frame. The sled is configured to slide vertically along the length of the rails and is releasably connected to the winch of the top member. The test fixture is configured to receive a sample for testing. The winch of the top member raises the sled to a desired height, the sled is released at the desired height and slides along the rails resulting in an impact on a sample placed in the test fixture.

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.

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.

A method and apparatus for testing the response of protective headgear 104 to impact forces. A high-speed cineradiography imaging system 100 is used to obtain full-field, time-resolved internal monitoring and measurement of headgear component (pads 140 and liners 142) deformation and interaction with a head surrogate (headform 102), deformation of headform components, and stress and strain transfer into the headform. Radiopaque contrast materials (144 & 148) and integration techniques are used to highlight specific regions of interest within the headgear and headform components during the impact loading events.

A method and apparatus for testing the response of protective headgear 104 to impact forces. A high-speed cineradiography imaging system 100 is used to obtain full-field, time-resolved internal monitoring and measurement of headgear component (pads 140 and liners 142) deformation and interaction with a head surrogate (headform 102), deformation of headform components, and stress and strain transfer into the headform. Radiopaque contrast materials (144 & 148) and integration techniques are used to highlight specific regions of interest within the headgear and headform components during the impact loading events.