bluuebunny/crossref_metadata_2025_split huggingface dataset:
Investigation of elastoplastic effects of cables under large spatial deformation
Authors: Dörlich Vanessa , Diebels Stefan , Linn Joachim 
Published: October 2015

AbstractCables are complex components consisting of a multi‐layer structure and various materials. The structural setup includes for example conducting wires, isolating shields and protecting sheaths. This leads to several inelastic effects under large deformations like pull‐out of wires, delamination of layers or friction between the constituents. The materials used in cables belong to different material classes and consequently show different behavior under load. Elastoplastic behavior has to be expected for metallic wires, whereas polymer layers behave viscoelastically. The combination of these inelastic effects caused by the structure and constituents of cables motivates the inclusion of inelasticity in the material model on a phenomenological level. Since cables are flexible, slender structures, they can be described physically correctly by the theory of Cosserat rods. In this context, the constitutive equations are formulated in terms of the sectional quantities. The related model parameters have to be determined in suitable experiments. As cables undergo large multiaxial deformations in applications, uniaxial experiments are not sufficient for their characterization. (© 2015 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Application of fibre BRAGG grating sensors for residual stress analysis
Authors: Hannusch Susann , Stockmann Martin , Ihlemann Jörn 
Published: October 2015

AbstractResidual stresses are important by the manufacturing of the most components. The analysis of residual stresses using the hole‐drilling method is complicated and is based at the moment solely on strain measurement on the surface. Now, an approach is described where the residual stresses can be calculated on the basis of strain measured in several plains. (© 2015 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
A physically motivated model for filled elastomers including strain rate and amplitude dependency in finite viscoelasticity
Authors: Juhre Daniel , Raghunath Rathan , Klüppel Manfred 
Published: October 2015

AbstractA microstructure‐based model of rubber reinforcement, the so‐called dynamic flocculation model (DFM), is presented describing filler‐induced stress softening and hysteresis by the breakdown and reaggregation of strained filler clusters [1]. An extension of this model allows to consider incomplete deformation cycles that occur in the simulation of arbitrary deformation histories [2]. Good agreement between measurement and the model is obtained for CB‐filled elastomers like NR, SBR or EPDM, loaded along various deformation histories. One very important aspect is that the model parameters can be directly referred to the physical properties.This benefit is used to extend the model to further essential effects like time‐ and rate‐dependent material behavior. In the limit range above the glass transition temperature these viscoelastic effects originate mainly from the filler‐filler interactions. In the material model these interactions are characterized by two material parameters sv and sd, respectively. The parameter sv defines the strength of the virgin filler cluster, whereas sd represents the strength according to the broken or damaged filler clusters. Both parameters can be defined as functions of time sv,d = ŝv,d(t), which can be motivated by physical meaning [3]. Due to this extension it is possible to capture the very complex strain rate and amplitude dependency during loading and relaxation. (© 2015 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
On the generation of soft magneto‐electric effects through Maxwell interactions
Authors: Keip Marc‐André , Rambausek Matthias 
Published: October 2015

AbstractThis contribution presents a finite‐strain computational homogenization framework for soft magneto‐electro‐elastic solids. We use it in order to determine effective magneto‐electric coupling coefficients of soft composites, which are driven by the interconnection of electrical and magnetical Maxwell stresses. (© 2015 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Efficient time integration in multiplicative inelasticity
Authors: Landgraf Ralf , Shutov Alexey V. , Ihlemann Jörn 
Published: October 2015

AbstractIn Shutov et al. (Comput Methods Appl Mech Eng 265:213–225, 2013), the numerical time integration of a famous large strain model of Maxwell fluid type has been considered. The underlying model is based on the multiplicative decomposition of the deformation gradient and includes a Neo‐Hookean hyperelasticity relation as well as an incompressible viscous flow rule. Shutov et al. presented a time stepping algorithm for implicit time integration of the inelastic flow rule, which is based on Euler backward time discretisation, prevents error accumulation and is iteration free. In this contribution, the basic idea of the this approach is applied to more general models of multiplicative viscoelasticity. Here, extended hyperelastic relations including general functions of the first principal invariant of deformation tensors are regarded. An efficient time stepping algorithm is derived, where only one scalar equation for one scalar unknown has to be solved within every time step. The approach is applied to a specific viscoelastic model. (© 2015 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
A Hardening Description based on a Finite‐Deformation Gradient Crystal Plasticity Model: Formulation and Numerical Implementation
Authors: Pouriayevali Habib , Xu Baixiang 
Published: October 2015

AbstractIn this study, a well‐defined finite‐deformation gradient crystal plasticity is employed to study size‐dependence strengthening behavior of a single crystal under simple shear loading. The constitutive model is implemented in the FEM software ABAQUS via a user‐defined element subroutine (UEL). Effect of gradient strengthening, latent hardening and scale‐variation in mechanically plastic response of a single crystal subjected to isothermal quasi‐static loading is studied and discussed. (© 2015 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Parameter Identification by Inverse Modelling of Biaxial Tensile Tests for Discontinous Fiber Reinforced Polymers
Authors: Schemmann Malte , Brylka Barthel , Gajek Sebastian , Böhlke Thomas 
Published: October 2015

AbstractIn the present article we discuss the characterization of the mechanical properties of long fiber reinforced thermoplastics (LFT) and sheet molding compounds (SMC) with biaxial tensile tests and the inverse parameter identification. The full 3D strain field is measured via digital image correlation (DIC). The anisotropic viscoelastic material properties are identified through inverse modelling by comparison of the heterogeneous experimental and simulated strain fields. A Gauss‐Newton type algorithm is used to identify the optimal parameter set [1]. (© 2015 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Harvesting energy with an out‐of‐plane dielectric elastomer generator
Authors: Bortot Eliana , Gei Massimiliano 
Published: October 2015

AbstractThis note concerns the numerical analysis of the performance of an annular membrane dielectric elastomer generator deforming non‐homogeneously out‐of‐plane. The prestretch of the membrane is crucial for an improved behaviour of this device. We evaluate its positive effects on the performance by employing a hyperelastic formulation. Moreover, fixing the external radius, we compare the behaviour of two generators characterized by different values of the radius ratio Re/Ri, namely 2 and 4. Numerical results show that the generator with the smaller ratio has a better performance. (© 2015 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Spreading of Linear Disturbances in Boundary Layers at Mach Number Five and the Effect of Wall Cooling
Authors: Jocksch A. , Kleiser L. 
Published: October 2015

AbstractWe determine inviscid eigensolutions in zero pressure gradient flat plate boundary layers at Mach number five and evaluate the eigensolutions with the method of steepest descent. The resulting wave packets show that with wall cooling the tail of the packets becomes slower. Although the boundary layers investigated are all convectively unstable we interpret the slow tail of the wave packets as a trend towards an absolute instability. From a comparison of the wave packets with turbulent spot transition, we conclude that for wall cooling the general transition properties are close to those of an absolutely unstable flow. (© 2015 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Unified description of bifurcation processes associated with laminar boundary‐layer separation
Authors: Kluwick Alfred , Braun Stefan 
Published: October 2015

AbstractThe presentation will concentrate on flows where no steady state exists if an appropriately defined controlling parameter exceeds a critical value while non‐uniqueness is observed for sub‐critical values of this parameter. Special attention is placed on flow phenomena which are associated with the passage through criticality. Based on a triple deck analysis it found that they can be described as solutions of differential equations of Fisher type which are better known from evolution studies of gene populations. Special examples which will be discussed include 2D marginally separated flows, weakly 3D transonic flows in slender channels and fully 3D subsonic flow past expansion ramps. (© 2015 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Robust Design using classical optimization
Authors: Erschen Stefan , Duddeck Fabian , Zimmermann Markus 
Published: October 2015

AbstractThe complexity of technical products increases significantly, due to an increasing number of interacting design variables of many components and subsystems. At the same time, the need for separated development processes is increasing due to specialization and outsourcing. Solution space methods are designed to solve this conflict. The requirements from an upper level, e.g. performance measures of the whole system, can be cascaded down to requirements on a lower level, e.g. performance measures of the subsystems or components, as it is done in the V‐model approach. The method does not only take the numerous interactions into account but also guarantees the resulting intervals of different parameters to be independent of each other. Unfortunately, the computational cost of the state‐of‐the‐art stochastic approach is high. The approach in this paper shows that the computational effort can be reduced considerably using a gradient based optimization approach for constraint problems. We demonstrate that the approach reduces the required number of function evaluations for a chassis design problem by a factor of 30, but more important, the CPU time for solving the problem by a factor of 20. (© 2015 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Methods with Successive and Parallel Approximations of Inverse Operator for the Nonlinear Least Squares Problem
Authors: Iakymchuk Roman , Shakhno Stepan 
Published: October 2015

AbstractFor solving the nonlinear least‐square problem, we propose iterative methods that use successive and parallel approximations of the inverse operator instead of solving a linear system of equations. The convergence order as well as the convergence radius of the proposed methods are studied. Finally, we carry out numerical experiments on a set of test problems. (© 2015 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
On curvature control in node–based shape optimization
Authors: Schmitt Oliver , Steinmann Paul 
Published: October 2015

AbstractWe present and compare three approaches to control of the curvature of the domain boundary in two–dimensional shape optimization. Since the coordinates of the FE–nodes are used as design variables, objective and constraint functions have to be formulated in terms of the nodal coordinates. Therefore we investigate various formulations for the curvature of the domain boundary in terms of the coordinates of the boundary nodes. In addition, the sensitivities of these expressions with respect to the design nodes are required for the application of gradient–based optimization algorithms. (© 2015 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
A kinematic approach based on an equivalent track for a skid‐steering vehicle
Authors: Galati R. , Giannoccaro N.I. , Messina A. , Reina G. 
Published: October 2015

AbstractThe skid‐steering principle is based on controlling the relative velocities of both the tracks as differential drive wheeled vehicles. However, control of tracked locomotion poses a more complex problem because variation of the relative velocity of the two tracks results often in slippage of the vehicle [1]. It is possible to define a kinematic approach able to describe and to improve the motion control and dead‐reckoning of a skid‐steering robot by considering the effects of the slippage but without introducing the complexity of dynamics computation. The equivalent track approach has been applied to a skid‐steering robot characterized by an high maximum payload (75 kg) and by a high power than makes it able to move in very difficult conditions (snow, iced terrains, mud) where the slippage effects become predominant. (© 2015 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Approximation in variation for Mellin integral operators
Authors: Angeloni Laura , Vinti Gianluca 
Published: October 2015

AbstractWe study approximation results for a family of Mellin integral operators in the space of functions of bounded variation in the multidimensional setting, by means of a new concept of variation for multivariate functions. (© 2015 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Deterministic sparse FFT algorithms
Authors: Plonka Gerlind , Wannenwetsch Katrin 
Published: October 2015

AbstractIn this paper we consider sparse signals
${\bf x}\in {\bf C}^N$
which are known to vanish outside a support interval of length bounded by m < N. For the case that m is known, we propose a deterministic algorithm of complexity
${\cal O}(m\log m)$
for reconstruction of x from its discrete Fourier transform
$\widehat{\bf x}\in {\bf C}^N.$
(© 2015 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Efficient and secure multi‐functional searchable symmetric encryption schemes
Authors: Hu Changhui , Han Lidong , Yiu Siu Ming 
Published: October 2015

AbstractThere is an increasing trend for data owners to outsource their data to an untrusted cloud provider. Besides providing the storage for the data, the service provider could allow the data owner or authorized clients to search over the data. To guarantee the data secure, the owner must encrypt his or her data before sending to the cloud. However, traditional encryption does not allow searching without decrypting the data. Searchable symmetric encryption is one approach that allows users to search over the encrypted data. For data applications, various different functional search have been proposed, such as wildcard search, similarity keyword search and fuzzy keyword search. Moreover, dynamic addition and removal of files should be supported in practice. However, to our knowledge, there does not exist a searchable symmetric encryption scheme that can support many properties such as more than three functions in all the aforementioned operations. In this paper, we propose an efficient multi‐functional searchable symmetric encryption scheme that can support wildcard search, similarity search (including hamming distance and edit distance), fuzzy keyword search and disjunctive keyword search simultaneously. In the new scheme, the trapdoor changes with various search requests and it enumerates all possibilities of the keyword of the trapdoor. Moreover, we use an array instead of a matrix to reduce the storage, and the scheme can be constructed efficiently in terms of both computational and space complexity. Our scheme is based on the Bloom filter, and it is secure against non‐adaptive chosen keyword attack. With the dynamic technique for the inverted index, our scheme can support dynamic operation such as addition and removal of data files, which can also be secure against adaptive chosen keyword attack. Copyright © 2015 John Wiley & Sons, Ltd.
Cryopreserved human umbilical cord patch for in‐utero spina bifida repair
Authors: Papanna R. , Moise K. J. , Mann L. K. , Fletcher S. , Schniederjan R. , Bhattacharjee M. B. , Stewart R. J. , Kaur S. , Prabhu S. P. , Tseng S. C. G. 
Published: October 2015

ABSTRACTObjectiveTo identify a patch system to repair surgically created spina bifida in a sheep model for its efficacy in healing the skin defect, protecting the underlying spinal cord and reducing the Chiari II malformation.MethodsSpina bifida was created surgically in 16 fetuses from eight timed‐pregnant sheep at gestational age of 75 days. Two fetuses did not survive the procedure. Repeat hysterotomy was performed at 95 days' gestation to cover the defect with either biocellulose film with underwater adhesive (BCF‐adhesive) (n = 7) or human umbilical cord with suture (HUC‐suture) (n = 7). Three fetuses without formation of the defect served as reference controls. The skin healing was examined by direct visualization after a planned Cesarean section at term, followed by histological analysis using hematoxylin and eosin and Masson's trichrome stains. Mid‐sagittal sections of the fetal cranium and upper cervical spine were analyzed by a pediatric neuroradiologist who was blinded to the type of patch received.ResultsThree fetuses that received the BCF‐adhesive and six fetuses that received the HUC‐suture survived to term for final analysis. As a result of dislodgment of the BCF‐adhesive, all spina bifida defects repaired using BCF‐adhesive were not healed and showed exposed spinal cord with leakage of cerebrospinal fluid. In contrast, all spinal defects repaired by HUC‐suture were healed with complete regrowth of epidermal, dermal and subdermal tissue components, with no exposed spinal cord. The maximal skin wound width was 21 ± 3.6 mm in the BCF‐adhesive group but 3 ± 0.8 mm in the HUC‐suture group (P < 0.001). The spinal cord area (P = 0.001) and the number of anterior horn cells (P = 0.03) was preserved to a greater degree in the HUC‐suture group than in the BCF‐adhesive group, whilst psammoma bodies, signifying neuronal degeneration, were only observed in the BCF‐adhesive group. Anatomic changes, indicative of Chiari II malformation, were seen in all three fetuses of the BCF‐adhesive group but in none of the HUC‐suture group (P < 0.01).ConclusionCryopreserved umbilical cord graft is a promising regenerative patch for intrauterine repair of spina bifida. Copyright © 2015 ISUOG. Published by John Wiley & Sons Ltd.
Impact of adding a second layer to a single unlocked closure of a Cesarean uterine incision: randomized controlled trial
Authors: Bennich G. , Rudnicki M. , Wilken‐Jensen C. , Lousen T. , Lassen P. D. , Wøjdemann K. 
Published: October 2015

ABSTRACTObjectiveTo investigate short‐ and long‐term effects on residual myometrial thickness (RMT) of adding a second layer to a single unlocked closure of a Cesarean uterine incision.MethodsThis was a randomized double‐blind controlled trial. Healthy nulliparous women scheduled for first‐time elective Cesarean delivery were operated on using a modified version of the Misgav Ladach surgical technique. The women were examined by transabdominal ultrasound before discharge from the maternity ward and by transvaginal saline contrast sonohysterography at a minimum of 5 months postpartum.ResultsSeventy‐six nulliparae met the criteria and agreed to participate in the study. Thirty‐five women were assigned to the single‐layer technique and 38 to the double‐layer unlocked closure technique. Groups were comparable regarding gestational age at delivery, duration of surgery and perioperative blood loss. There was no difference in RMT between the two groups, both at time of discharge (mean ± SD, 20.2 ± 8.0 mm vs 21.0 ± 9.7 mm) and after 5 months postpartum (mean, 5.7 ± 2.9 mm vs 5.7 ± 2.2 mm). RMT was approximately half that of the normal myometrium at both examinations.ConclusionThe results of this study suggest that double‐layer closure of a Cesarean uterine incision does not increase RMT compared with single‐layer closure when an unlocked technique is used. Copyright © 2015 ISUOG. Published by John Wiley & Sons Ltd.
Characteristics of Zircon of Chhatrapur Beach Placer Deposit, Ganjam District, Odisha
Authors: Das S. K. 
Published: October 2015

Abstract
Morphological characteristics, statistical analysis, zoning, fracture patterns, mineral inclusions, metamictisation, parallel growth and overgrowth of zircon grains from Chhatrapur coast, Odisha are discussed. Zircon grains show variation in colour from brownish to colourless types. Euhedral zircon grains constitute 6.35% and considerable amounts are composed of elongated (31.22%), oval (18.94%), rounded (11.83%), subhedral (14.87%) and broken (11.10%) types. Some zircon grains show regular concentric zoning to faintly developed, blurred and patchy zoning patterns. Fracture patterns are radial, diagonal, concentric and irregular types. The mineral inclusions constituted of quartz, ilmenite, sillimanite, apatite, monazite, biotite, pyroxene, K-feldspar and plagioclase feldspar. The study indicated that the provenance of the zircon grains of Chhatrapur deposit comprised of igneous and metamorphic rocks of Eastern Ghat Mobile Belt (EGMB).
Quaternary Tectonic Deformations and Geomorphic Setup of Samakhiali Alluvial Plain, Eastern Kachchh, Western India
Authors: Goyal Bhanu , Thakkar M. G. , Bhandari S. 
Published: October 2015

Abstract
Eastern Kachchh is a critical intra-plate seismo-tectonic region where geomorphic features reflect pre-Quaternary and Quaternary structures and sub-surface-deformation. The Bhuj earthquake of 2001 occurred in the same region but did not generate any significant primary deformation features on the surface, however secondary deformations helped in deducing the nature of the earthquake. The present study was, therefore, aimed at understanding the nature of subsurface deformation applying geomorphic criteria in the alluvial landscape of Samakhiali plain. A wrench style of deformation has been observed in the sub-surface along the emerging tips of two faults – south Wagad fault and Kachchh Mainland fault. Incidentally the deformation model proposed here is substantiated by seismic studies carried out in this transition zone.
Depositional Environment in Great Indian Desert using Grain Size Parameters and its Chemical Characterization
Authors: Singh Chander Kumar , Kumar Pankaj , Kumar Alok , Mukherjee Saumitra 
Published: October 2015

Abstract
Grain size is a fundamental descriptive measure of sediment and sedimentary rock. A large part of information related to sedimentary particles transport and deposition can be obtained from grain size. Grain size parameters are useful for recognizing sedimentary environments such as dune, river, beach marine and others of continental shelf through graphical, moment and statistical methods. Bivariate plots between various statistical grain size parameters can be successfully used for distinction of such environments. The present study aims at grain size analysis of fifty sediment samples collected from Thar desert of India. The statistical grain size parameters were treated using different statistical tools such as factor and discriminatory analysis to decipher the depositional history of the sediments of the study region. The analysis suggests that the sediments mainly deposited in fluvial to beach environment along with aeolian deposition. The shape and composition of the sediments grains were also studied using energy dispersive X-ray spectroscopy-scanning electron microscope (EDX-SEM) which suggested the dominance of fluvial environment in the deposition.