Temat: impact method - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Pyro-adaptive impact energy absorber
Autorzy:: Ostrowski, M.
Griskevicius, P.
Holnicki-Szulc, J.
Powiązania:: https://bibliotekanauki.pl/articles/241641.pdf
Data publikacji:: 2007
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: adaptive systems
crashworthiness
impact
control applications
finite element method
Opis:: The paper contains a proposal of energy dissipation density controlling in lightweight thin walled structures by reducing their crushing stiffness during an impact process. For small scale laboratory experiments, low-energy-dissipation absorber was developed. Prismatic absorber made of thin lead sheets can dissipate the impact energy at two energy density levels. Moving the concept to the real steel or aluminum structures can lead to satisfying value of the Specific Energy Absorption indicator with possible control of the energy dissipation. Experimental and FE explicit simulation results showing controllable impact process of a thinwalled prismatic absorber with rectangular crossection are presented. The control of crushing forces proved to be possible and efficient. Adaptivity ratio achieved in the presented example was 35%. The idea of the presented absorber was based on automotive front rail shape. The experimental tests have to be re-conducted. Geometry of the tested absorber should be modified to facilitate the detachment process of the stiffening members.
Źródło:: Journal of KONES; 2007, 14, 1; 303-309
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Numerical analysis of impact load of arch yielding support
Autorzy:: Tokarczyk, J.
Turewicz, K.
Smolnik, G.
Rotkegel, M.
Powiązania:: https://bibliotekanauki.pl/articles/243887.pdf
Data publikacji:: 2010
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: virtual prototyping
finite elements method
mining
impact analysis
experimental test
Opis:: Bumping is one of the natural hazards that occur in Polish collieries. It is a common phenomenon but difficult to predict and very often it causes huge losses in mining equipment and roadway structure. Death of miners working underground is most severe result of bumping. To reduce or even to eliminate results of bumping, especially fatal cases, many safety measures have been used. Frame of arch support is one of the measures applied to reduce dangerous results of bumping. Simulation test ofimpact load of arch yielding support was presented in the paper. The simulation of support load was realized in two stages. Static load of frame of yielding arch support was simulated at the first stage. Among others simulation of assembly of arch support components was carried out. Non-linear simulation, including contact phenomena, was conducted for that purpose. First stage of the task was realized in MSC.Marc/Mentat software Structure of yielding arch support was dynamically loaded at the second stage. The forcing corresponded to real dynamic loads that werefound in mine workings. Second stage of the task was realized in MSC.Dytran software The results of simulations carried out at the KOMAG Institute of Mining Technology were compared with the results of tests of arch supports, which were realized at the Central Mining Institute.
Źródło:: Journal of KONES; 2010, 17, 1; 455-464
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Numerical simulations of mechanical peening of titanium alloy
Autorzy:: Kosiuczenko, K.
Barnat, W.
Napadłek, W.
Bogdanowicz, Z.
Powiązania:: https://bibliotekanauki.pl/articles/243311.pdf
Data publikacji:: 2008
Wydawca:: Instytut Techniczny Wojsk Lotniczych
Tematy:: surface layer forming
mechanical shot peening
impact
numerical simulation
finite element method
Opis:: Mechanical peening is based on striking a worked material surface by hard balls (shot).In this work, a pneumatic method, applied for double-sided shot peening of the worked sample surface, was selected. The samples were made of the titanium alloy WT3-1 (Ti-6Al-2Cr-2Mo). The described work consists of two parts. The laboratory experiment was conducted in first part. After it realization, various observations were conducted. Observations of surface topography for samples were carried out before and after shot peening using scanning electron microscope (SEM). They revealed quite regular plastically deformed zones generated due to applied working. Neither microcracks, spallings nor delaminations in deformed surface layer of the titanium alloy were observed which attests to correct technological process of the surface hardening. The numeric simulation of the peening process was conducted in part second. The physical model described non-simultaneous impact of three steel balls onto rectangular metal sheet made of the above-mentioned titanium alloy. Numerical FEM analysis for nonlinear dynamics (explicit) was carried out using LS-Dyna software (Livermore Software Technology Corporation). In the paper are presented maps of the material effort in surface layers for times corresponding to conditions after impacts of the first, second, and the third ballof cast steel shot.
Źródło:: Journal of KONES; 2008, 15, 1; 137-144
1231-4005
2354-0133
Pojawia się w:: Journal of KONES
Dostawca treści:: Biblioteka Nauki

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