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Fatigue crack initiation and propagation in lotus-type porous material
Srečko Glodež, Sašo Dervarič, Janez Kramberger, Matjaž Šraml, 2016, izvirni znanstveni članek

Opis: The investigation of fatigue strength of lotus-type structure with nodular cast iron as a base material using computational model is analysed in present study. The irregular pores distribution in transversal and longitudinal direction, regarding the external loading, is considered in the computational models. The complete fatigue process of analyzed porous structure is then divided into the crack initiation (Ni) and crack propagation (Np) period where the total fatigue life (N) is defined as: N = Ni + Np. The crack initiation period is determined using strain life approach where elastic-plastic numerical analysis is performed to obtain the total strain amplitude in the critical stress fields around the pores. The simplified universal slope method is then used to determine the number of stress cycles, Ni, required for formation of initial cracks. The number of stress cycles, Np, required for crack propagation from initial to the critical crack length is also numerically determined using finite element (FE) models, in the frame of Abaqus computation FEM code. The maximum tensile stress (MTS) criterion is considered when analyzing the crack path inside the porous structure. The performed computational analyses show that stress concentrations around individual pores are higher when external loading is acting in transversal direction in respect to the pore distribution. Therefore, further computational analyses regarding crack initiation and crack propagation period have been done only for pores distribution in transversal direction.
Ključne besede: lotus-type porous structures, fatigue crack initiation, fatigue crack propagation, numerical analysis
Objavljeno: 02.08.2017; Ogledov: 346; Prenosov: 203
.pdf Celotno besedilo (4,75 MB)
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Analyzing hotel innovation behavior in the Balaton region of Hungary to identify best practices
Petra Gyurácz-Németh, Nikolett Horn, Nóra Friedrich, 2016, izvirni znanstveni članek

Opis: The goal of the research is to investigate the hotel innovation behavior in one of the most important tourism regions of Hungary. The Lake Balaton Region is a very popular area of the country with quite a short season (from the middle of June to August 20). The region is the second most visited area based on the number of guests and guest nights in Hungary. The topic of innovation plays a growing role in the Hungarian hotel sector as well, because competition is very high and keeping guests and employees can be a great challenge. The study involved both qualitative and quantitative research. The qualitative research aimed to identify the best practices of the Hotel Európa Fit****superior which introduced an “innovation by inspiring” strategy and applies several types of innovation in a highly recommended way. The respondents of the questionnaire included 28 hotel general managers (52% of the 54-person sample). The results showed a strong relationship between the type of the hotel and the number of innovations as well as the type of the hotel and the frequency of innovation.
Ključne besede: innovation behavior, hotel type, best practice, Hungary
Objavljeno: 03.11.2017; Ogledov: 340; Prenosov: 141
.pdf Celotno besedilo (276,52 KB)
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