Procedia IUTAM最新文献

{"title":"On Yield Criterion Choice in Thermoelastoplastic Problems","authors":"Evgeniy P. Dats ,&nbsp;Evgenii V. Murashkin ,&nbsp;Narinder K. Gupta","doi":"10.1016/j.piutam.2017.06.020","DOIUrl":"10.1016/j.piutam.2017.06.020","url":null,"abstract":"<div><p>The present study is devoted to the boundary value problem of coupled thermoelastoplasticity. The temperature depended yield criterion and Duhamel Neumann constitutive equation was used. The material subjected to uneven heat treatment under plane strain frameworks was considered. The new analytical solution of the problem of uneven heat treatment of the thermoelasticplastic hollow cylinder was constructed within of the thermal stresses and plastic flow theories. The three different yield criteria were used. The original numerical scheme for calculations of temperature stresses and plastic strains in the frameworks of the von Mises yield criterion was developed and implemented. The characteristics of the plastic flow in the heating domain according to the yield criterion selection are eliminated. Constructed solutions of the boundary value problems were compared and analyzed for yield criteia of von Mises, Tresca and Ishlinsky-Ivlev.</p></div>","PeriodicalId":74499,"journal":{"name":"Procedia IUTAM","volume":"23 ","pages":"Pages 187-200"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.piutam.2017.06.020","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"55246646","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Action of the Semi-infinite Plates on the Elastic Layer","authors":"Vladimir Babeshko ,&nbsp;Olga Evdokimova ,&nbsp;Olga Babeshko","doi":"10.1016/j.piutam.2017.03.007","DOIUrl":"10.1016/j.piutam.2017.03.007","url":null,"abstract":"<div><p>The contact problem of acting of the two semi-infinite Kirchhoff plates on the elastic layer is considered. The vertical static stresses acts on the plates. The problem is to study the contact stresses concentrations between the plates and the layer in this block structure. It was proved that the contact stresses concentrations in the end-walls of the plats are the same as in the end-walls of the rigid stamps acted on the layer if the distance between the end-walls of the plates is not equal to zero and is equal the square of this stresses if this distance is equal to zero. It can induce the destruction of the materials in engineering or appearance of the earthquake in seismology.</p></div>","PeriodicalId":74499,"journal":{"name":"Procedia IUTAM","volume":"20 ","pages":"Pages 50-55"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.piutam.2017.03.007","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"55244212","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Estimation of extreme hydrodynamic environments of Puti Island wind farm in Bohai Sea","authors":"Jifu Zhou ,&nbsp;Jinlong Liu","doi":"10.1016/j.piutam.2017.09.012","DOIUrl":"10.1016/j.piutam.2017.09.012","url":null,"abstract":"<div><p>In order to manifest the extreme hydrodynamic environments for Puti Island wind farm in Bohai Sea, flow and wave climates in the area induced by cold waves are investigated. According to the historical meteorology statistics and taking the global climate change into account, three typical paths (NNE, ENE and NNW) with four high wind speeds for cold waves in Bohai Sea are presumed. After calibrated with field data, the Princeton Ocean Model (POM) and the third-generation wave model, SWAN, are employed to delineate possible extreme hydrodynamic conditions in the area of Puti Island wind farm. The dependence of the extreme current and water wave parameters to the wind speed and wind direction is investigated. The distribution of the extreme current and water wave parameters in the wind farm is discussed.</p></div>","PeriodicalId":74499,"journal":{"name":"Procedia IUTAM","volume":"25 ","pages":"Pages 74-81"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.piutam.2017.09.012","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"55249804","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Flood-tide interaction numerical simulation at Min River tidal reach","authors":"Cifu Fu ,&nbsp;Qiuxing Liu ,&nbsp;Fujiang Yu ,&nbsp;Jianxi Dong","doi":"10.1016/j.piutam.2017.09.018","DOIUrl":"10.1016/j.piutam.2017.09.018","url":null,"abstract":"<div><p>Flood and tide features atMin River tidal reach are analyzed anda high-resolution flood-tide coupled model which useshigh-resolution GIS data for Minjiang Estuary with the highest grid resolution of 50-100m at key areas isestablished in this paper. Unstructured triangular mesh that can realize the grid resolution of 50-100m at key areas is employed in the model. Zhuqi section is chosen for flood boundary, and three numerical experimentsare conducted for June 6 2006 flood process. The experimental results indicate that, when coupled with tide and flood, the simulation of each tide gauge agrees very well with measured data compared withmodelresults only with flood or tide, and the original tidal features are changedat the different sections in Min River tidal reachedby the flood signals. Obvious flood characteristics are shown in Wenshanli and Jiefang Bridge station and flood-tidal mixed characteristics are shown in Xianan, Baiyantan and Guantou station.The strong interaction between tide and floodoccursin the watercourse (from Xiannan in South Channel to Guantou) because the current velocity is reduced during high water time but increasedduringlow water time.</p></div>","PeriodicalId":74499,"journal":{"name":"Procedia IUTAM","volume":"25 ","pages":"Pages 119-125"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.piutam.2017.09.018","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"55249891","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Simulation of the Basilar Membrane Vibration of Endolymphatic hydrops","authors":"Sinyoung Lee,&nbsp;Takuji Koike","doi":"10.1016/j.piutam.2017.08.043","DOIUrl":"10.1016/j.piutam.2017.08.043","url":null,"abstract":"<div><p>Endolymphatic hydrops (EH) causes fluctuating hearing loss especially at low frequencies. In this paper, we analyze EH with the human cochlear finite element model which includes activity of the outer hair cells (OHC). EH was simulated by loading static pressure on the surface of the basilar membrane (BM) of the cochlear model. The vibrations of the BM in the EH model were calculated by applying sound pressure to the stapes, and the results were compared with those in the normal cochlea model. As a result, the distribution of characteristic frequency (CF) was changed and the displacement of the BM was decreased by loading static pressure to the BM. This suggests that the mechanism of hearing loss was caused by EH.</p></div>","PeriodicalId":74499,"journal":{"name":"Procedia IUTAM","volume":"24 ","pages":"Pages 64-71"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.piutam.2017.08.043","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"55249398","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Case study on impact of storm waves on inundation characteristics","authors":"Yoshimitsu Tajima","doi":"10.1016/j.piutam.2017.09.006","DOIUrl":"10.1016/j.piutam.2017.09.006","url":null,"abstract":"<div><p>Modeling interactive features of storm waves and surges may be one of important but challenging tasks toward more accurate estimations of coastal hazards under severe storms. This paper discusses how storm waves and interactions of waves and surges affect amplification of local inundation characteristics through overviews of several case studies of recent coastal disasters. The paper first describes witnessed inundation characteristics caused by Super Typhoon Haiyan along the coast of San Pedro Bay and also the east coast of Eastern Samar in the Philippines. Along the west coast of San Pedro Bay, neither predicted storm surge nor storm wave can reasonably represent the following observed features: inundation around the mouth of San Pedro Bay started about an hour prior to the time when the inundation was witnessed at the inner part of the bay and the water level quickly descended after the peak around the bay mouth while it was kept high for an hour in the inner part of the bay. Along the east coast of Eastern Samar, deformation of wind wave components strongly depends on bathymetry of fringing coral reefs and refraction, diffraction and wave-wave interactions appear to have significant influence on observed locally varying damage levels and inundation characteristics. Similar locally concentrated inundation was also observed along the west coast of Batan island, the Philippines when the super typhoon Meranti passed north of the island. Significant influence of infra-gravity waves on the locally concentrated inundation characteristics was also observed in the disaster along Seisho coast on the Pacific coast of Japan when the typhoon, Fitow, hit the coast in 2007. Based on these findings, finally, this paper discusses how the numerical model should be extended for better estimations of coastal hazard with brief example of model application to South Pacific islands.</p></div>","PeriodicalId":74499,"journal":{"name":"Procedia IUTAM","volume":"25 ","pages":"Pages 36-43"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.piutam.2017.09.006","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"55249310","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Development of operational multi-scale storm surge inundated model and application of 2013 typhoon Haiyan","authors":"Yu-Lin Tsai ,&nbsp;Tso-Ren Wu ,&nbsp;Chuan-Yao Lin ,&nbsp;Simon C. Lin ,&nbsp;Chuen-Teyr Terng","doi":"10.1016/j.piutam.2017.09.015","DOIUrl":"10.1016/j.piutam.2017.09.015","url":null,"abstract":"<div><p>The coastal regions in Eastern Asia are under the potential threat of storm surges, especially the surge inundation caused by typhoons. In this study, the COMCOT (COrnell Multi-grid Coupled Tsunami Model) storm surge model has been developed for the approach of operational process and successfully coupled with dynamic atmospheric WRF model and global tidal TPXO 7.1 model. The large-scale and near-shore storm surge propagation could be simulated simultaneously with nested-grid scheme, and high-resolution inundated areas could also be calculated from the wet-dry-cell method. The destructive storm surge event induced by 2013 Typhoon Haiyan is chosen as the case study in this research, and the non-symmetric WRF fields and TPXO tidal effect are both considered in this case. From simulated results, the storm surges are concentric before Typhoon Haiyan landing off the Philippines because the pressure gradient was significant at that time, and then storm surges are concentrated at near-shore regions when wind shear stress turn to be the main force after landing off. The relationship between maximum storm surges and typhoon crack is also found in this study. More details would be presented at 2016 IUTAM Symposium.</p></div>","PeriodicalId":74499,"journal":{"name":"Procedia IUTAM","volume":"25 ","pages":"Pages 100-103"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.piutam.2017.09.015","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"55249847","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study on the design of excessive typhoon and its induced storm surge","authors":"Yuwen Li ,&nbsp;Lu Li ,&nbsp;Xiaotao Du ,&nbsp;Hua Liu","doi":"10.1016/j.piutam.2017.09.020","DOIUrl":"10.1016/j.piutam.2017.09.020","url":null,"abstract":"<div><p>Excessive typhoon design is an interesting topic in coastal engineering. To design an excessive typhoon, the most popular method is typhoon path translation, but it may cause unreasonable results sometimes. In this paper, a correction method is introduced by using statistical air pressure map and wind speed map. Longquangang area along the north bank of Hangzhou Bay is taken as the research area here. The designed typhoon path is translated from Typhoon Khanun (2005). After typhoon strength correction and time translation, the result of wind speed and typhoon-induced storm surge seems more reasonable and can be used in coastal engineering, such as dike design and dike risk assessment.</p></div>","PeriodicalId":74499,"journal":{"name":"Procedia IUTAM","volume":"25 ","pages":"Pages 131-140"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.piutam.2017.09.020","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"55249956","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Mechanical Aspects of the Round Window Stimulation","authors":"Christoph Heckeler,&nbsp;Albrecht Eiber","doi":"10.1016/j.piutam.2017.08.039","DOIUrl":"10.1016/j.piutam.2017.08.039","url":null,"abstract":"<div><p>During the last years, the round window (RW) has become a well established application position for active middle ear implants¹. The coupling condition between actuator and round window membrane (RWM) is the critical point regarding the lasting function of the reconstruction. A preload force is needed to maintain sound transmission dealing with an unilateral contact. In this work, the RW stimulation is examined from the mechanical point of view. Based on laboratory experiments and computational simulations, the effects of parameter variations on the dynamical behaviour of the reconstructed ear are revealed in sensitivity analyses and case studies.</p><p>Force-displacement measurements are carried out in order to capture the nonlinear stiffening and the relaxation behaviour of the RWM. Its characteristics are quantifed by mechanical parameters based on visco-elastic models². A simplified mechanical multibody model is used to simulate the transfer of sound in the natural ear. Hereby, the transmission ratio between oval window and RW has to be taken into account. In case of otosclerosis, stiffening of the annular ring leads to alterations in the transfer behaviour. A hearing loss is observed mainly in the low frequency range, whereas increased hearing sensation may occur in the higher frequency range.</p><p>With free floating actuators, vibration is transmitted via the actuator housing. The working principle is based on the inertia effect of an internal seismic mass. As an example, the Floating Mass Transducer (FMT) is presented, which is acting as a force transducer. In the not implanted case, the actuator exhibits freqency dependent spatial motions. For assessing the dynamics of the reconstructed ear, the natural structure and the actuator have to be considered as a whole. Based on a multibody model, various influences are investigated by means of virtual experiments, e.g. the preload force, the actuator suspension and the intermediate layer in the contact area. The preload force leads to stiffening of the natural system due to its nonlinear behaviour. As a consequence, resonances are shifted to higher frequencies and low frequency amplitudes are reduced. With increasing preload force, the dynamic force amplitude transmittable without lift-off in the contact area is increased. The corresponding maximum level of equivalent sound pressure is determined by the mechanical properties of the natural structure, but not by not the actuator. The suspension of the actuator housing should be designed to be as compliant as possible in order to maintain the mobility of the actuator during stimulation and to preserve the preload force during large quasistatic deformations of the RWM. Increased motion transfer is observed in the higher frequency range in case of additional damping in the intermediate layer.</p></div>","PeriodicalId":74499,"journal":{"name":"Procedia IUTAM","volume":"24 ","pages":"Pages 15-29"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.piutam.2017.08.039","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"55249012","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Wave breaking and runup of long waves approaching a cliff over a variable bathymetry","authors":"James George Herterich ,&nbsp;Frédéric Dias","doi":"10.1016/j.piutam.2017.09.004","DOIUrl":"10.1016/j.piutam.2017.09.004","url":null,"abstract":"<div><p>Long waves approaching a cliff are significantly affected by a variable bathymetry. Wave breaking is observed, and determined by both the bathymetry and nonlinear interactions of the waves with the cliff and other waves. Geometric and kinematic measures are applied to determine a breaking criteria, however there are inconsistencies in both when the wave parameters are close to breaking/non-breaking interface values. Wave crest-cliff interaction is discussed in terms of its effect on the phase and fluid velocities. Runup amplification increases with the number of waves in the approaching wavepacket, their amplitude, and the bathymetry slope, but is approximately independent of the wave period. Runup amplifications approaching a factor of 12 are observed for a bathymetry approximating that of the Aran Islands, Ireland.</p></div>","PeriodicalId":74499,"journal":{"name":"Procedia IUTAM","volume":"25 ","pages":"Pages 18-27"},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.piutam.2017.09.004","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"55249157","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}