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Jiajia Peng, Gaoming Jiang and Honglian Cong

References [1] Komatsu K; Human skin model capable of natural shape variation; Visual Computer. 1988,3(5):265-71. [2] Turner R; Thalmann D;The Elastic Surface Layer Model for Animated Character Construction: Springer Japan; 1993, 399-412. [3] Thalmann D; Shen J; Chauvineau E; Fast Realistic Human Body Deformations for Animation and VR Applications; Conference on Computer Graphics International 1996. [4. Allen B; Curless B; Popović Z. The Space of Human Body Shapes: Reconstruction And Parameterization from Range Scans; Acm Transactions on

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Leyla Sultanova

-2156. 11. Horgan C.O. (1995), Anti-plane shear deformations in linear and nonlinear solid mechanics, SIAM review , 37(1), 53-81. 12. Jiang H., Browning R., Whitcomb J.D., Ito M., Shimouse M., Chang T.A., Sue H.J. (2010). Mechanical modeling of scratch behavior of polymeric coatings on hard and soft substrates, Tribology letters , 37(2), 159-167. 13. Kaplunov J., Nobili A. (2017), Multi-parametric analysis of strongly inhomogeneous periodic waveguideswith internal cutoff frequencies, Mathematical Methods in the Applied Sciences , 40(9), 3381

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P. Obara and W. Gilewski

). [6] W. Sochacki, “The dynamic stability of a simply supported beam with additional discrete elements”, Journal of Sound and Vibration 314, 180–193 (2008). [7] B. Sahoo, L.N. Panda, and G. Pohit, „Nonlinear dynamics of an Euler-Bernoulli beam with parametric and internal resonances”, International Conference on Design and Manufacturing, Procedia Engineering 64, 727–736 (2013). [8] Y.Q. Huang, H.W. Lu, J.Y. Fu, A.R. Liu, and M. Gu, “Dynamic stability of Euler beams under axial unsteady wind force”, Mathematical Problems in Engineering 2014, (2014

Open access

Raid Ramzi Al-Omari, Madhat Shakir Al-Soud and Osamah Ibrahim Al-Zuhairi

used to simulate the soil structure interaction at the tunnel-soil interface. An isotropic elastic model was used for the pile, piles cap, tunnel lining and tunnel boring machine shield (TBM). Zarev (2016) stated that the advanced models like HS and HS small model are required for obtaining a realistic prediction of the deformations during shield tunnelling. Table 2 summarizes the soil properties adopted from Miro et al., 2012 . According to Zarev (2016), the HS model allows for accounting the plastic collapse (isotropic hardening cap plasticity) as well as

Open access

Jana Labudková and Radim Čajka

References [1] CAJKA, R. & LABUDKOVA, J. Influence of parameters of a 3D numerical model on deformation arising in interaction of a foundation structure and subsoil. In: Proceedings of 1st International Conference on High-Performance Concrete Structures and Materials (COSTMA '13). Budapest, Hungary, December 10-12, 2013, ISSN 2227-4359, ISBN 978-960-474-352-0. [2] CAJKA, R. & LABUDKOVA, J. Dependence of deformation of a plate on the subsoil in relation to the parameters of the 3D model. International Journal of Mechanics, 2014

Open access

Stanislav Piovár and Eva Kormaníková

Abstract

In the paper the parametric study of free vibration analysis of sandwich panel is presented. Effects of the face sheet material, as well as those related to the ply-thickness, core thickness and length of the panel are investigated. There are used approaches based on the first order shear deformation theory. Natural frequencies of sandwich panel are calculated by using analytical solution, which is compared with A NSYS results.

Open access

Jae Woong Kim, Beom Seon Jang, Yong Tai Kim and Kwang San Chun

ABSTRACT

The use of I-Core sandwich panel has increased in cruise ship deck structure since it can provide similar bending strength with conventional stiffened plate while keeping lighter weight and lower web height. However, due to its thin plate thickness, i.e. about 4~6 mm at most, it is assembled by high power CO2 laser welding to minimize the welding deformation. This research proposes a volumetric heat source model for T-joint of the I-Core sandwich panel and a method to use shell element model for a thermal elasto-plastic analysis to predict welding deformation. This paper, Part I, focuses on the heat source model. A circular cone type heat source model is newly suggested in heat transfer analysis to realize similar melting zone with that observed in experiment. An additional suggestion is made to consider negative defocus, which is commonly applied in T-joint laser welding since it can provide deeper penetration than zero defocus. The proposed heat source is also verified through 3D thermal elasto-plastic analysis to compare welding deformation with experimental results. A parametric study for different welding speeds, defocus values, and welding powers is performed to investigate the effect on the melting zone and welding deformation. In Part II, focuses on the proposed method to employ shell element model to predict welding deformation in thermal elasto-plastic analysis instead of solid element model.

Open access

N. Mohan Raj, L.A. Kumaraswamidhas and S. Arungalai Vendan

Abstract

This research study aims to investigate the mechanical and metallographical aspects of ultrasonic welding of Cu-Cu wires. Experimental trials have been conducted and observations have been recorded as a database that collates parametric, quality and strength aspects of various weldments. Destructive testing and metallurgical characterizations have been carried out to examine the strength and integrity of the weldment. The key focus of this research attempt is laid on determining and evaluating the factors that governs the strength of the weldment. Metallurgical characterizations reveal vital information on the weld integrity and the extent of grain distribution. Further, FEM is employed to understand the deformation and thermal aspects involved in Cu-Cu welding using ultrasonics. The numerical model may provide an insight into the thermal phenomenon governing the joining process and subsequently estimation of the impact. Response surface methodology is employed to identify the parametric interdependencies and subsequently determine the optimized range.

Open access

Ivan Němec and Šárka Sychrová

Abstract

The presented article is a contribution to the discussion concerning nuclear safety which has intensified after the Fukushima Daiichi nuclear disaster. A parametric study concerning various materials, containment wall thicknesses and different aircraft speeds at the time of impact was performed. The aim of this study was to establish damage extent of various variants of a containment structure. Containment damage was evaluated by means of the value of maximum permanent deformation and plastic strain extent. The purpose of this study was also to foster experiential suggestions for improving the explicit method in the RFEM program in order to release it for RFEM users.

Open access

Konstantin I. Matveev

ABSTRACT

A method of hydrodynamic discrete sources is applied for two-dimensional modeling of stepped planing surfaces. The water surface deformations, wetted hull lengths, and pressure distribution are calculated at given hull attitude and Froude number. Pressurized air cavities that improve hydrodynamic performance can also be modeled with the current method. Presented results include validation examples, parametric calculations of a single-step hull, effect of trim tabs, and performance of an infinite series of periodic stepped surfaces. It is shown that transverse steps can lead to higher lift-drag ratio, although at reduced lift capability, in comparison with a stepless hull. Performance of a multi-step configuration is sensitive to the wave pattern between hulls, which depends on Froude number and relative hull spacing