A method for high-speed impact experiment of structural reinforcement
By using dynamic simulation of boundary specimens and CAE calculations, and adjusting the high-speed drop hammer test device, the early challenges of high-speed column impact verification of sill structure reinforcement were solved, achieving resource conservation and performance verification.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- WUHU HAICHENG RUBBER & PLASTIC
- Filing Date
- 2022-08-25
- Publication Date
- 2026-06-09
AI Technical Summary
Existing technologies cannot verify the high-speed pole impact performance of door sill reinforcement components in the early stages, and whole-vehicle crash tests consume a lot of resources.
By designing multiple sets of boundary specimens to conduct dynamic simulation of high-speed drop hammer experiments, force response, pressure response and deformation rate data are obtained. Combined with CAE calculation methods, the impact speed, mass and fixture position of the high-speed drop hammer test device are adjusted to conduct an equivalent replacement vehicle collision test.
This enabled the early development and verification of door sill reinforcement components, saving resources for whole-vehicle crash testing and solving the problem that the static three-point bending method could not fully verify high-speed pole impact.
Smart Images
Figure CN115541412B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of high-speed impact testing technology for structural reinforcements, and in particular to a high-speed impact test method for structural reinforcements. Background Technology
[0002] With the development of automotive safety technology standards, my country will adopt the side pole collision standard. In order to achieve the lightweight design of door sill beams, structural reinforcement components are now widely used in the automotive industry. They have the characteristics of lightweight structure and high specific strength, and have become another composite material tool for body design engineers to improve the bending resistance of the structure. However, at present, the test verification of the high-speed pole collision performance of door sill beams can only be achieved by whole vehicle collision. Therefore, the high-speed pole collision performance of door sill structural reinforcement components cannot be verified in the early stage.
[0003] The impact velocity of structural reinforcements at the threshold is relatively high, resulting in large structural deformation. Sheet metal and structural reinforcements exhibit strain rate effects under high-speed impact. Therefore, the low-speed static three-point bending method is not suitable for verifying the performance of structural reinforcements. Thus, this invention proposes a high-speed impact test method for structural reinforcements to solve the problems existing in the prior art. Summary of the Invention
[0004] To address the aforementioned problems, the present invention aims to propose a high-speed impact testing method for structural reinforcement components. This method offers the advantage of saving resources in vehicle crash testing and solves the problems existing in the prior art.
[0005] To achieve the objectives of this invention, the invention is implemented through the following technical solution: a high-speed impact test method for structural reinforcement, comprising the following steps:
[0006] Step 1: Determine experimental data
[0007] First, design multiple sets of boundary specimens of different sizes. Then, conduct dynamic simulation high-speed drop hammer tests on multiple sets of boundary specimens. By using a high-speed impact head to impact the boundary specimens during the experiment, obtain the force response, pressure response and deformation speed of the specimens during the impact of the impact head. Then, compare the obtained data with the data in the whole vehicle collision test to confirm the boundary conditions and collision performance requirements of the high-speed pole impact test.
[0008] Step 2: Calculate the experimental scheme
[0009] Based on the boundary conditions and collision performance requirements of the high-speed column impact test obtained through experiments in step one, and combined with the high-speed drop hammer test device, the formal test scheme is pre-calculated using CAE calculation methods.
[0010] Step 3: Experiment Begins
[0011] According to the formal experimental plan calculated in step two, the test part is mounted on the test platform of the high-speed drop hammer test device using a fixture. The fulcrum position of the corresponding fixture is adjusted according to the determined experimental plan. Then, the high-speed drop hammer test device is started to carry out the experiment.
[0012] A further improvement is made in the following: In step one, the dynamic simulation of the high-speed falling hammer experiment includes using different impact velocities, different impact masses, and the fulcrum position of the fixture.
[0013] A further improvement is made in the following steps: In step one, the whole vehicle collision test involves selecting a group of whole vehicle samples, setting up corresponding sensors on the whole vehicle samples, and conducting a complete high-speed pole impact test, and obtaining the force response, pressure response, and deformation speed on the whole vehicle samples during the high-speed pole impact test.
[0014] A further improvement is made in step two, in the formal experimental scheme, by adopting the principles of equal energy absorption and equal deformation, adjusting the impact speed of the high-speed falling hammer experimental device, the impact mass of the falling hammer, and the fulcrum position of the clamp.
[0015] A further improvement is made in step three by increasing or decreasing the weight of the impact head to achieve the required weight for the experiment.
[0016] A further improvement is that in step three, the fixture and the test bench are fixed together with bolts, and there is a gap between the fixture and the test bench.
[0017] A further improvement is that, in step three, the shape of the fixture is adapted to the shape of the test part.
[0018] A further improvement is made in step three, whereby the test parts are visually inspected before installation to ensure there are no obvious cracks.
[0019] The beneficial effects of this invention are as follows: This high-speed impact test method for structural reinforcement first obtains the boundary conditions and collision performance requirements of the high-speed pole impact test, then combines them with a high-speed drop hammer test device, and uses CAE calculation methods to pre-calculate the test scheme. Subsequently, by adopting the principles of equal energy absorption and equal deformation, the impact speed, the impact mass of the drop hammer, and the fulcrum position of the fixture are adjusted to make the bending deformation of the sill under impact equal. This solves the problem that the static three-point bend test in the prior art cannot fully verify the high-speed pole impact test. It is equivalent to replacing the strength test of the sill components in the high-speed pole impact test of the whole vehicle, enabling the development and verification of the internal structural reinforcement of the sill to be carried out at an early stage, while saving the resources of the whole vehicle collision test. Attached Figure Description
[0020] Figure 1 This is a schematic diagram of the steps in Embodiment 1 of the present invention.
[0021] Figure 2 This is a schematic diagram showing the positional relationship between the fixture and the test part in Embodiment 2 of the present invention. Detailed Implementation
[0022] To enhance understanding of the present invention, the present invention will be further described in detail below with reference to embodiments. These embodiments are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention.
[0023] Example 1
[0024] according to Figure 1 As shown in the figure, this embodiment proposes a high-speed impact test method for structural reinforcements, including the following steps:
[0025] Step 1: Determine experimental data
[0026] First, multiple sets of boundary specimens of different sizes were designed. Then, dynamic simulation high-speed drop hammer experiments were conducted on these specimens. The main purpose of the dynamic simulation high-speed drop hammer experiment was to generate multiple sets of different experimental data by conducting experiments on boundary specimens of different sizes using different drop hammer data. Specifically, different impact velocities, impact masses, and fixture fulcrum positions were used. During the experiment, a high-speed impact head was used to impact the boundary specimens to obtain the force response, pressure response, and deformation rate of the specimens during the impact. The obtained data was then compared with data from a full vehicle collision test. The full vehicle collision test involved selecting a set of full vehicle samples, deploying corresponding sensors on the samples, and conducting a complete high-speed pole impact test. The force response, pressure response, and deformation rate of the full vehicle samples during the high-speed pole impact test were obtained. Through data comparison and analysis, the boundary conditions and collision performance requirements of the high-speed pole impact test were confirmed.
[0027] Step 2: Calculate the experimental scheme
[0028] The boundary conditions and collision performance requirements of the high-speed pole impact test obtained in Step 1 are combined with the existing high-speed drop hammer test device. The formal test plan is pre-calculated using CAE calculation methods. CAE refers to Computer-Aided Engineering in engineering design, which uses computers to help solve and analyze the structural mechanical properties of complex engineering projects and products, as well as optimize structural performance, and organically organizes various links in engineering (production). Then, the boundary conditions and collision performance requirements in the experiment are obtained to plan the test plan. Specifically, in the formal test plan, the principles of equal energy absorption and equal deformation are adopted to adjust the impact speed of the high-speed drop hammer test device, the impact mass of the drop hammer, and the fulcrum position of the fixture. The main purpose is to make the high-speed drop hammer impact test equivalent to the strength test of the sill components in the high-speed pole impact test of the whole vehicle.
[0029] Step 3: Experiment Begins
[0030] According to the formal experimental plan calculated in step two, the test parts are mounted on the test platform of the high-speed drop hammer test device using fixtures. The fulcrum position of the corresponding fixture is adjusted according to the determined experimental plan. Then, the high-speed drop hammer test device is started to conduct the experiment. During the experiment, the weight of the impact head is adjusted by increasing or decreasing the counterweight of the impact head to achieve the required impact head weight.
[0031] Example 2
[0032] This embodiment proposes a high-speed impact test method for structural reinforcement components, including the following steps:
[0033] Step 1: Determine experimental data
[0034] Two sets of boundary specimens of different sizes were designed first. Then, dynamic simulation high-speed drop hammer experiments were conducted on the two sets of boundary specimens. The main purpose of the dynamic simulation high-speed drop hammer experiment was to conduct experiments on boundary specimens of different sizes using different drop hammer data to generate multiple sets of different experimental data. Specifically, different impact velocities, impact masses, and fulcrum positions of the fixtures were used. During the experiment, a high-speed impact head was used to impact the boundary specimens to obtain the force response, pressure response, and deformation rate of the specimens during the impact. The obtained data was then compared with data from a full vehicle collision test. The full vehicle collision test involved selecting a set of full vehicle samples, deploying corresponding sensors on the full vehicle samples, and conducting a complete high-speed pole impact test to obtain the force response, pressure response, and deformation rate of the full vehicle samples during the high-speed pole impact test. Through data comparison and analysis, the boundary conditions and collision performance requirements of the high-speed pole impact test were confirmed.
[0035] Step 2: Calculate the experimental scheme
[0036] The boundary conditions and collision performance requirements of the high-speed pole impact test obtained in Step 1 are combined with the existing high-speed drop hammer test device. The formal test plan is pre-calculated using CAE calculation methods. CAE refers to Computer-Aided Engineering in engineering design, which uses computers to help solve and analyze the structural mechanical properties of complex engineering projects and products, as well as optimize structural performance, and organically organizes various links in engineering (production). Then, the boundary conditions and collision performance requirements in the experiment are obtained to plan the test plan. Specifically, in the formal test plan, the principles of equal energy absorption and equal deformation are adopted to adjust the impact speed of the high-speed drop hammer test device, the impact mass of the drop hammer, and the fulcrum position of the fixture. The main purpose is to make the high-speed drop hammer impact test equivalent to the strength test of the sill components in the high-speed pole impact test of the whole vehicle.
[0037] Step 3: Experiment Begins
[0038] According to the formal experimental plan calculated in step two, the test parts are installed on the test platform of the high-speed drop hammer test device using a fixture. The fulcrum position of the corresponding fixture is adjusted according to the determined experimental plan. Then, the high-speed drop hammer test device is started to carry out the experiment. During the experiment, the weight of the impact head is increased or decreased to achieve the required impact head weight.
[0039] Specifically, the high-speed drop hammer test apparatus mainly consists of a test bench, fixtures, and an impact head, but also includes other equipment used in the actual implementation. This high-speed drop hammer test apparatus is existing technology and is therefore not described in detail. For example... Figure 2 As shown, the diameter of the impact head is 254mm, and its weight is adjustable. By changing the weight of the counterweight, the required weight can be achieved. Furthermore, the fixture can be machined according to the shape of the part, that is, the fixture is adapted to the shape of the test part to prevent the part from undergoing axial displacement. The two fixtures can be moved along the axial direction of the part to adjust the displacement between the two clamps. At the same time, the fixtures are fixed to the test table with bolts, and there is a certain gap between them to ensure that the part can deform normally, while having a certain strength to ensure that the fixtures cannot deform or break during the impact test. Furthermore, before the test part is installed, the test part is visually inspected to ensure that there are no obvious cracks, ensuring the accuracy of subsequent experiments.
[0040] This invention, by testing the sill reinforcement, effectively replaces the strength testing of sill components in the high-speed pole impact test of a whole vehicle. This allows for the early development and verification of the sill reinforcement, while saving resources for whole vehicle crash tests and solving the problem that the static three-point bend test in the prior art cannot fully verify the high-speed pole impact.
[0041] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.
Claims
1. A high-speed impact test method for structural reinforcement components, characterized in that: Includes the following steps: Step 1: Determine experimental data First, multiple sets of boundary specimens of different sizes are designed. Then, dynamic simulation high-speed drop hammer tests are conducted on multiple sets of boundary specimens. During the experiment, a high-speed impact head is used to impact the boundary specimens to obtain the force response, pressure response, and deformation rate of the specimens during the impact. The obtained data is then compared with the data from the whole vehicle collision test to confirm the boundary conditions and collision performance requirements of the high-speed pole impact test. In step one, the dynamic simulation high-speed drop hammer test includes using different impact velocities, different impact masses, and the fulcrum position of the fixture. In step one, the whole vehicle collision test involves selecting a set of whole vehicle samples, deploying corresponding sensors on the whole vehicle samples, and conducting a complete high-speed pole impact test to obtain the force response, pressure response, and deformation rate of the whole vehicle samples during the high-speed pole impact test. Step 2: Calculate the experimental scheme Based on the boundary conditions and collision performance requirements of the high-speed column impact test obtained through experiments in step one, and combined with the high-speed drop hammer test device, the formal test scheme is pre-calculated using CAE calculation methods. In step two, in the formal test scheme, the principles of equal energy absorption and equal deformation are adopted to adjust the impact speed of the high-speed drop hammer test device, the impact mass of the drop hammer, and the fulcrum position of the fixture. Step 3: Experiment Begins According to the formal experimental plan calculated in step two, the test part is mounted on the test platform of the high-speed drop hammer test device using a fixture. The fulcrum position of the corresponding fixture is adjusted according to the determined experimental plan. Then, the high-speed drop hammer test device is started to carry out the experiment.
2. The high-speed impact test method for structural reinforcement according to claim 1, characterized in that: In step three, the required weight of the impact head is achieved by increasing or decreasing the counterweight of the impact head.
3. The high-speed impact test method for structural reinforcement according to claim 1, characterized in that: In step three, the fixture and the test bench are fixed together with bolts, and there is a gap between the fixture and the test bench.
4. The high-speed impact test method for structural reinforcement according to claim 1, characterized in that: In step three, the fixture is adapted to the shape of the test part.
5. The high-speed impact test method for structural reinforcement according to claim 1, characterized in that: In step three, before the test parts are installed, a visual inspection is performed on the test parts to ensure that there are no obvious cracks.