RESEARCH REGARDING THE IMPACT BEHAVIOR OF POLYMERIC BIO-COMPOSITES PRODUCTS [303009]

[anonimizat], Diana COTOROS,……………………………………

[anonimizat], have special characteristics and use in various areas such as: automotive, [anonimizat], etc This paper presents the evaluation of impact behaviour of different materials type. [anonimizat]. [anonimizat] 8200.

Bio-compozitele polimerice au caracteristici special și aplicații în diferite domenii: [anonimizat], civilă etc. Lucrarea prezintă evaluarea comportării la impact a diferitelor materiale de acest tip. [anonimizat]. [anonimizat] 8200, având system asistat de achiziție și control al datelor.

Keywords: [anonimizat], Behavior, Impact test

1. [anonimizat], [anonimizat], [anonimizat]. These materials are well known for the extremely complex behaviour strongly depending on the time and the temperature.

[anonimizat]: [anonimizat]-composites fibre reinforced wooden fir. Impact test on polymeric material is an impact test measuring the resistance to failure of a material to a suddenly applied force. The impact test measures the impact energy or the energy absorbed prior to fracture [1, 2].

2. [anonimizat], as it is a fast and economical test. [anonimizat]. When the specimen couldn’t [anonimizat] [5].[anonimizat] 8200, figure 1.

Fig. 1. The Dynatup Model 8200 Impact Test

The impact testing system has: maximum gravity mode velocity up to 5,0 m/s, maximum spring assisted high velocity up to 20 m/s, maximum physical drop height of 1,25 meters, self-id load cell for measuring drop mass. The 8200 [anonimizat], ceramics, and metals.

3. [anonimizat]-[anonimizat]. The specimen’s measure are 150x100x15 mm. [anonimizat]. [anonimizat]. [anonimizat] 2 [anonimizat] wooden beech and in figure 3 for the polymeric bio-composites fibre reinforced wooden fir material. In the charts there are the blue line – for variation of energy E in [kg m] and the red line – for variation of load F in [kN]. The impulse console is designed to provide intelligent test setup and control with a very flexible interface. This controller displays real-time data while providing access to test set-up controls. Digital display indicates user, exactly what the current settings are, including test drop height, velocity, and impact energy. The impact mass used was m = 3,94 kg.

Sample 1, H=50 mm b) Sample 2, H= 60mm

Sample 3, H=70mm d) Sample 4, H=80mm

e) Sample 5, H=90mm

Fig. 2. Polymeric bio-composites fibre reinforced wooden beech samples’ charts

Sample 1, H=50mm b) Sample 2, H= 60mm

c) Sample 3, H=70mm d) Sample 4, H=80mm

e) Sample 5, H=90mm

Fig. 3. Polymeric bio-composites fibre reinforced wooden fir samples charts

The notation is: H in [mm] – the sample drop height; v – the impact velocity in [m/s]; E – the total energy in [Kgm]; and W is the total energy in [J].

4. Results and discussion

The system used is a fully-integrated electronics and software package that increases impact testing productivity through automated data acquisition, analysis and reporting. Impulse utilizes an impact force transducer and falling mass velocity detector to capture load vs. time information from instrumented impact tests. Table 1 presents the experimental results collected for 5 samples from polymeric bio-composites fibre reinforced wooden beech and table 2 shows for samples from polymeric bio-composites fibre reinforced wooden fir material.

Table 1

Polymeric bio-composites fibre reinforced wooden beech-Experimental results

Table 2.

Polymeric bio-composites fibre reinforced wooden fir – Experimental results

Figure 4 present the photographs taken with the polymeric bio-composites fibre reinforced wooden beech, left side(a, b, c, d, e) and polymeric bio-composites fibre reinforced wooden fir, right side(1, 2, 3, 4, 5) used to determine the resistance to impact, after we made the impact tests. As you can see from the picture, the materials behave very differently at high rates of loading.

Sample a, H=50mm, wooden beech Sample 1, H =50mm, wooden fir

Sample b, H=60mm, wooden beech Sample 2, H =60mm, wooden fir

Fig. 4. Polymeric bio-composites fibre reinforced wooden beech – to be continued

Sample c, H=70mm, wooden beech Sample 3, H =70mm, wooden fir

Sample d, H=80mm, wooden beech Sample 4, H =80mm, wooden fir

Sample e, H=90mm, wooden beech Sample 5, H =90mm, wooden fir

Fig. 4. Polymeric bio-composites fibre reinforced wooden beech, left side(a, b, c, d, e) and polymeric bio-composites fibre reinforced wooden fir, right side(1, 2, 3, 4, 5)

In figure 5 and in figure 6 are presented diagrams height variation on impact speed and energy for polymeric bio-composites fibre reinforced wooden beech, while figure 7 and figure 8 show diagrams height variation on impact speed and energy for polymeric bio-composites fibre reinforced wooden fir.

Fig. 5. Chart speed depending on the height of impact for polymeric bio-composites fibre reinforced wooden beech

Fig. 6. Chart total energy depending on the height of impact for polymeric bio-composites fibre reinforced wooden beech

Fig. 7. Chart speed depending on the height of impact for polymeric bio-composites fibre reinforced wooden fir

Fig. 8. Chart total energy depending on the height of impact for polymeric bio-composites fibre reinforced wooden fir

5. Conclusion

DE ACTUALIZAT

The polymeric bio-composites fibre reinforced wooden beech and polymeric bio-composites fibre reinforced wooden fir materials behave very differently at different rates of loading and that is why there cannot be uses static strength tests to predict impact behaviour.

For polymeric bio-composites fibre reinforced wooden beech specimen, break type evidences low dependence on the drop height, as to h: 50-90 mm there is no breakage. For polymeric bio-composites fibre reinforced wooden fir specimen, we observed that for the same drop height, h = 50-90 mm there is relevant failure.

Polymeric bio-composites fibre reinforced wooden beech material proves good elasticity, when compared to polymeric bio-composites fibre reinforced wooden fir material.

Standard impact test method represents an important tool for raw material research and quality control. When the total energy, W [J] accumulates in time and, if increased, achieves a level of constancy, it proves that it is absorbed by bio-composites polymeric material.

R E F E R E N C E S

DE ACTUALIZAT

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