Proceedings of the Fourteenth International Conference on Computational Structures Technology最新文献_第8页

An IRF method for stochastic meshless analysis of 2D beams with lognormally varying random Young's modulus 具有对数正态变随机杨氏模量的二维梁随机无网格分析的IRF方法

Proceedings of the Fourteenth International Conference on Computational Structures Technology Pub Date : 1900-01-01 DOI: 10.4203/ccc.3.6.3

M. Aswathy, C. Arun

{"title":"An IRF method for stochastic meshless analysis of 2D beams with lognormally varying random Young's modulus","authors":"M. Aswathy, C. Arun","doi":"10.4203/ccc.3.6.3","DOIUrl":"https://doi.org/10.4203/ccc.3.6.3","url":null,"abstract":"The current paper proposes to use an improved response function (IRF) method for stochastic meshless analysis of a 2D beam wherein Young’s modulus is assumed to vary as a lognormal random field. The meshless tool used in the present study is the element-free Galerkin method. In IRF method, the total displacement response is evaluated in each simulation by adding a deterministic part and an IRF. This displacement decomposition combined with the stiffness modelling using the second order expansion of Taylor series is substituted in the stochastic system of equations to find the expressions for the deterministic solution and the IRF. The deterministic solution evaluation is possible outside the loop for simulation and the expression for IRF involves only simple algebraic operations to be carried out inside the simulation loop. A 2D beam with cantilever boundary conditions loaded at the free end with a parabolic traction is analysed and the response moments are determined using the IRF method proposed. The first two moments of response obtained are observed to be matching well with the MCS moments even at higher values of coefficient of variation. The IRF method proposed also produces the distributions of response comparable with the distributions evaluated using MCS. The difference in response moments evaluated using IRF method and the second order perturbation method is in the acceptable limit. The computational efficiency of the IRF method is evidently better compared to MCS.","PeriodicalId":143311,"journal":{"name":"Proceedings of the Fourteenth International Conference on Computational Structures Technology","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130707560","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Study on Stress State of Root Notch of Butt Weld with Variable Wall Thickness 变壁厚对接焊缝根部缺口应力状态研究

Proceedings of the Fourteenth International Conference on Computational Structures Technology Pub Date : 1900-01-01 DOI: 10.4203/ccc.3.16.1

B. Guo, D. Wang, H. Liang, X. Xu, R. Zhan

引用次数: 0

Space-time isogeometric analysis for the simulation of fracture with gradient damage models 用梯度损伤模型模拟断裂的时空等几何分析

Proceedings of the Fourteenth International Conference on Computational Structures Technology Pub Date : 1900-01-01 DOI: 10.4203/ccc.3.18.1

F.K. Feutang, S. Lejeunes, D. Eyheramendy

引用次数: 0

Automation of Frequency Domain Decomposition for Operational Modal Analysis using Finite Element Model 基于有限元模型的运行模态分析频域分解自动化

Proceedings of the Fourteenth International Conference on Computational Structures Technology Pub Date : 1900-01-01 DOI: 10.4203/ccc.3.13.2

S. Lee, M. Oh, P. Lee

引用次数: 0

Designing eco-friendly cement composites mixtures aided by artificial neural networks 利用人工神经网络设计生态友好型水泥复合材料

Proceedings of the Fourteenth International Conference on Computational Structures Technology Pub Date : 1900-01-01 DOI: 10.4203/ccc.3.21.1

S. Czarnecki, M. Moj

引用次数: 0

Rate-independent growth and remodelling of soft biological tissues: a constrained mixture approach for finite element analysis 软体生物组织的速率无关生长和重塑:有限元分析的约束混合方法

Proceedings of the Fourteenth International Conference on Computational Structures Technology Pub Date : 1900-01-01 DOI: 10.4203/ccc.3.2.4

M. Latorre, J. Humphrey

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Optimal topologies considering fatigue with reliability constraint 考虑疲劳和可靠性约束的最优拓扑

Proceedings of the Fourteenth International Conference on Computational Structures Technology Pub Date : 1900-01-01 DOI: 10.4203/ccc.3.2.5

J. Lógó, P. Tauzowski, B. Blachowski

{"title":"Optimal topologies considering fatigue with reliability constraint","authors":"J. Lógó, P. Tauzowski, B. Blachowski","doi":"10.4203/ccc.3.2.5","DOIUrl":"https://doi.org/10.4203/ccc.3.2.5","url":null,"abstract":"The process of design optimization is generally accompanied by a decrease of the level of reliability. It can be even more problematic when one can elaborate topology optimization tasks, where the optimization process is based on material removal in least stressed areas. In order to control the safety level of the structure, it is necessary to include estimation of the probability of failure in the optimization procedure by adding constraint(s) for the reliability index. This approach is called Reliability Based Topology Optimization (RBDO). The lighter/thinner design is more likely to fail due to random factors. Among them, wind or accidental loads are most often mentioned as uncertain effects for structures. In the case of mass production of some parts, there may also be a material parameters or geometrical dimensions, which are characterized by a certain scatter caused by a production accuracy. The aim of this paper is to formulate an iterative algorithm for topology optimization taking into account fatigue based reliability constraints. As the performance function number of cycles has been taken for low cycle fatigue problem. Combination of recently proposed topology optimization method and reliability analysis of the Authors of this presentation may lead to very complex and time consuming procedure. To tackle with this problem a First Order Reliability Method (FORM) is applied. There are several kinds of procedures within the first order approach such as: Reliability Index Approach (RIA) or the family of Performance Measure Approach (PMA) algorithms.","PeriodicalId":143311,"journal":{"name":"Proceedings of the Fourteenth International Conference on Computational Structures Technology","volume":"105 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132450318","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Material-informed topology optimization for Wire-and-Arc Additive Manufacturing 线材和电弧增材制造的材料信息拓扑优化

Proceedings of the Fourteenth International Conference on Computational Structures Technology Pub Date : 1900-01-01 DOI: 10.4203/ccc.3.2.1

M. Bruggi, V. Laghi, T. Trombetti

{"title":"Material-informed topology optimization for Wire-and-Arc Additive Manufacturing","authors":"M. Bruggi, V. Laghi, T. Trombetti","doi":"10.4203/ccc.3.2.1","DOIUrl":"https://doi.org/10.4203/ccc.3.2.1","url":null,"abstract":"Wire-and-Arc Additive Manufacturing (WAAM) is a metal 3d printing technique that allows fabricating elements ranging from simple geometry to extremely complex shapes. “Layer-by-layer” manufacturing produces a printed material with significant elastic anisotropy, whereas “dot-by-dot” printing may be used to fabricate funicular geometries in which the mechanical properties of the single bars are affected by the printing process. The design of WAAM components is addressed by formulating problems of structural optimizations that account for the peculiar features of the printed alloy. Topology optimization by distribution of anisotropic material is exploited to find optimal shapes in layer-by-layer manufacturing. Two-dimensional specimens are addressed along with I-beams. In the latter case it is assumed that a web plate and two flanges are printed and subsequently welded to assemble the structural component. A constrained force density method is proposed for the design of grid shells in dot-by-dot printing, formulating local enforcements to govern the magnitude of the axial force in each branch of the network. In both formulations, the arising multi-constrained problem is efficiently tackled through methods of sequential convex programming. Lightweight solutions for layer-by-layer and dot-by-dot manufacturing are found for given printing directions. Extensions of the proposed numerical tools are highlighted to endow the optimization problems with additional set of material-related constraints.","PeriodicalId":143311,"journal":{"name":"Proceedings of the Fourteenth International Conference on Computational Structures Technology","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126575136","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The new base-isolated Research Center of the Camerino University: design and testing 卡梅里诺大学新基地隔离研究中心:设计和测试

Proceedings of the Fourteenth International Conference on Computational Structures Technology Pub Date : 1900-01-01 DOI: 10.4203/ccc.3.11.3

A. Dall'asta, G. Leoni, F. Micozzi, L. Gioiella, N. Ceccolini, L. Ragni

引用次数: 0

Convergence Study of Local Hierarchical Functions for Free Vibration Analysis with Application to Multi-Step Beams 自由振动分析的局部层次函数收敛性研究及多阶梁的应用

Proceedings of the Fourteenth International Conference on Computational Structures Technology Pub Date : 1900-01-01 DOI: 10.4203/ccc.3.19.2

R.K. Dangarwala, K. N. Nagendra Gopal

{"title":"Convergence Study of Local Hierarchical Functions for Free Vibration Analysis with Application to Multi-Step Beams","authors":"R.K. Dangarwala, K. N. Nagendra Gopal","doi":"10.4203/ccc.3.19.2","DOIUrl":"https://doi.org/10.4203/ccc.3.19.2","url":null,"abstract":"The free vibration analysis of homogeneous uniform beams, plates and multi-step beams by the Ritz method, using local Bardell’s polynomials and trigonometric functions, is studied in this paper. The first part of the paper presents a comparative study of the convergence of hierarchical sets under both p-and h -refinements. To this end, a beam and plate are modelled using a single element with a varied number of local functions and multiple elements with a fixed number of local functions. In the second part the above sets of local hierarchical functions are applied for the free vibration analysis of a multi-step beam. With the aim to improve the accuracy of the fundamental mode when using local trigonometric functions, a set of modified local trigonometric functions is proposed to facilitate the satisfaction of the global natural boundary conditions. The use of modified local trigonometric functions with the satisfaction of global natural boundary conditions is shown to significantly improve the accuracy and convergence of the fundamental mode while also converging for higher modes. Moreover, it is also shown to converge under h -refinements in contrast to the divergence observed when using standard trigonometric functions.","PeriodicalId":143311,"journal":{"name":"Proceedings of the Fourteenth International Conference on Computational Structures Technology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126122244","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0