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1

Analysis of Degressive Front Car Crash Structures

Szlosarek R., Neuber R., Kröger M.

Machine Dynamics Research

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2018

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Vol. 42, No. 2

45--51

EN

Minimizing the injury risk to passengers in frontal crash situations represents the superior goal of the car structure engineering. In contrast to the existing systems, the use of a degressive front car structure can improve the crash performance. This paper presents a ﬁnite element modelling method allowing to study the inﬂuence of the force-displacement curve of the main chassis beam on the crash performance with respect to the passenger injury risk. A solution for realizing a degressive main chassis beam was tested in a drop tower. The result shows that the constructed main chassis beam works, and that it signiﬁcantly reduces the injury risk to the passenger.

2

Impact testing of carbon fiber-epoxy resin composite with graphene

Wiśniewski A., Sałacińska A., Wilk J.

Prace Instytutu Lotnictwa

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2016

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Nr 4 (245)

271--279

EN

The article presents the state of knowledge in the field of dynamic tests with the use of Drop Tower devices of the impact energy of a spherical pivot 18 J. Developed structures of composite samples were presented, with dimensions of 150x100 mm, consist of unidirectional prepreg MTM46/HTS (12K)-150-35% RW and adhesive film with and without addition of graphene plane. The impact strength of these composites panels were investigated according to ASTM D7136/7136M-15 method. Relationship between impact force versus time during impact test was presented. Relationship between deformation and impact energy in the time of the test was also consulted. The type and degree of samples destruction were observed by the microscope. The effect of graphene addition on the properties of carbon fiber-epoxy resin composites were determined.

PL

W artykule przedstawiono stan wiedzy w zakresie badań dynamicznych z zastosowaniem urządzenia Drop Tower o energii uderzenia trzpienia kulistego 18 J. Przedstawiono opracowane konstrukcje wykonanych płyt kompozytowych z użyciem preimpregnatu jednokierunkowego MTM46/HTS(12K)-150-35% RW o wymiarach 150x100 mm z klejem błonkowym i płyt kompozytowych z grafenem na nośniku z kleju błonkowego. Wykonano badania wytrzymałości tych płyt na uderzenie według normy ASTM D7136/7136M-15. Przedstawiono wykresy zależności siły od czasu podczas uderzenia próbek oraz zależności głębokości deformacji i energii uderzenia od czasu w próbie uderzenia. Oceniono sposób i stopień zniszczenia próbek z zastosowaniem mikroskopu. Określono wpływ grafenu na właściwości kompozytu węglowo-epoksydowego.

3

Development of Crash Absorbers Made of Carbon Fibre-Reinforced Plastic Based on Experimental Studies

Szlosarek R., Bombis F., Mühler M., Kröger M.

Machine Dynamics Research

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2015

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Vol. 39, No. 4

65-72

EN

Crash absorbers made of carbon fibre-reinforced plastics (CFRP) become more and more popular to reduce mass in the front structure of cars. One open question in this issue is the correct layup, which specifies the fibre orientation, in order to obtain high specific energy absorption. Within the research, a first test series investigates crash absorbers with a fibre orientation in axial and circumferential direction and an orientation of ±45°. Based on these first experimental studies an optimisation of the layup results in a crash absorber made of CFRP with a significant higher specific energy absorption than a comparable crash absorber made of aluminium.