Automotive test dummy skin material

"Automobile Collision Safety Performance Test" is one of the most concerned automotive test projects. With the rapid growth of the sales of passenger products in China, the safety of automobiles is also increasingly valued by consumers. Car Collision Test Dumman (Automotive Safety Dumper) is an indispensable basic test equipment for automotive collision safety performance test, and data obtained from the dummy can predict the risk of passengers injured in the actual collision. The more realistic the experimental dummy simulation, the more accurate test results. Understand the impact of the vehicle itself, safety system and passengers in collision, can continue to improve the safety performance of the product. Therefore, to implement the China New Car Safety Evaluation Procedure (C-NCAP) must have a test fake person who uses China's own automobile collision test [1-2].
The car collision test dummy is manufactured according to the principle of similarity, realizing the similarity of external morphology, material tissue is equivalent, and an internal structure simulated a body model of various sensors. The "skin" of the car collision experiment dummy is a bionic skin muscle composite, as the first line of defense, the elasticity, hardness and bounce performance of the material will directly affect the vehicle collision test impact energy Attenuation, transfer and deposition. Biomimetic material The reboundability and damage factor will affect the acceleration and impact load of the collision impact response, so that the change and phase lag of the signal amplitude of the sensor in the fake body, affecting the scientific determination of the degree of car crash test on human injury And accuracy. Due to the particularity of the car collision test dummy's bionic skin material, the hardness, strength, elastic modulus of bionic materials uses a single Shore hardness index characterization, and the mechanical performance test of plastic rubber non-metallic solid material The mechanical properties of bionic materials have not been comprehensively assessing, and the "skin" material of the car collision test dummy is required to resist the damage of the collision impact, but also to pass the shock wave information to the sensor embedded inside. In response to the particularity of the auto collision test dummy bionic skin material, the impact test method, the impact information is used, and the impact spectrum and the shock wave conduction impedance analysis are performed, so that the mechanical properties of the auto collision test dummy bionic skin material structure and impact strength The equivalent is combined, and the design, synthesis, preparation providing data analysis and theoretical basis of the automobile collision test simulator bionic skin material is of great guidance.
1. Establishment of the impact model
The impact process of the fake person from the car crash test is transient, and the duration is short, and it is sudden, dramatic energy release, energy transfer and conversion process. As a test system, the fake man is related to the motion of the impact, and the motion state is related to the impact duration and the system of the system. From the perspective of theoretical analysis, the impact movement is a response to a short pulse, step or other transient non-cycle. The system vibration caused by the impact response can quickly disappear, but it causes the maximum stress (or displacement) that may damage the system.[3-5]. The impact kinetic process is a series of dynamic processes that vary over time, and the simplified impact model is established. The impact rate of the elastic material is k, M1 is V0 to obtain a motion equation:

A, X reflects the peak and pulse width during the impact; VP is impact 1/2 of the maximum speed. When the impact hammer is mass, the impact speed is constant, the pulse width is related to the rigidity coefficient k of the elastic material, so the impact waveform is tested, the impact information is collected, and the impact spectrum and the shock wave conduction impedance analysis are performed, so that the dummy skin material for the car collision test The mechanical properties of the structure and the equivalence of the impact strength are combined.

2 Impact Experiment Analysis
2. Impact Test Establishment
The mechanical properties of bionic skin materials have greatly determined the advantages and disadvantages of materials in practical applications, due to the preparation of cured agents and The amount of the filler and the post-vulcanization time will affect the mechanical properties of the bionic skin material. In order to prepare a bionic skin, it is correctly understood and mastered the laws of these factors. The test samples are selected from the four materials that have different formulations and preparation time (recorded as a test piece 1, test piece 2, test piece 3 and Test piece 4), tested in an equal volume, the sample sample diameter is 60 mm, and the thickness is 15 mm. The impact test principle is shown in Figure 2, using a vertical impact method. The flush quality is 150g, the punched work surface and the sample height of 200 mm, release the impact hammer, hit the impact station (test piece) at a speed of V u003d 6 m / s. Record the impact wave peak and the conductive wave wave spectrum.

2.2 Experimental Data Analysis

Fig. 3 (A to D) is the shock wave and conductive wave wave spectrum of 4 test pieces, (above is a shock spectrum, under The figure is a conduction spectrum), seen from the figure: (a) The conductive wave of the test piece 1 occurs; (b) the impact wave and conduction wave spectrum of the test piece 2 are ideal; (c) Test piece 3 The wave wave spectra is the material damage phenomenon; (d) Figure 4 reflects the impact wave in the elasticity of the test piece material,

The impedance of the conductive wave is large.

Fig. 4 is a stress at the time of the test piece during impact.

is shown in the figure to see the pulse wavelength pulse width of the test piece 1, the test piece 2 and the test piece of 43 materials is 0.5 ms, but the test piece 2 is hit The stress is large, the response is fast, the transmission wave signal is strong, the stress of the test pieces 1 and 4 is substantially the same, and the shock wave signal is weak.

From the analysis of test data, it can be seen that the growth of the post-laud time on material performance is large.It is too long or too short to make the material have better elastic properties. After the test piece 2 is 5 h, the method of mechanical properties of the bionic skin materials are better; the filler is used in the bionic skin. The material has a very obvious reinforcement effect; the test piece 1 and 4 increase the strength of the curing agent, and the impedance of the material is also increased, and the impact performance of the biostile skin material is lowered. Therefore, the amount of the curing agent orthodoxic acid acetate has a significant effect on the properties of the bionic skin material.
3 Conclusion

The requirements for the car collision test dummy bionic skin materials are both resistant to collision impact, but also to pass the shock wave information to the sensor buryed inside the test mock. Using the impact test method, the impact spectrum and the impact of the wave guided information are used, and the "skin" material of the automobile collision test simulator is feasible, which is feasible, which can be pavilked to the automobile collision test dummy bionic skin material structure. The mechanical properties and the equivalence of impact strength are combined. The impact performance analysis of the auto collision test dummy bionic skin material is the design, synthesis, and preparation of bionic skin materials to provide data analysis and theoretical basis.

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