检索结果-内蒙古大学图书馆

The linear elastic analysis of cracked bodies, crack paths and some practical crack path examples

ENGINEERING FRACTURE MECHANICS 2016年 167卷 2-19页

作者： Pook, L. P. 21 Woodside Rd Sevenoaks TN13 3HF England

The linear elastic analysis of cracked bodies is a Twentieth Century development, with the first papers appearing in 1907. The stress intensity factor concept, introduced in 1957, developed rapidly in the 1960s, with widespread application to practical problems. Finite element analysis had a significant influence on the development of linear elastic fracture mechanics. Corner point singularities were investigated in the late 1970s, but a new field parameter is still needed to describe the stresses at surfaces. There are geometric constraints on permissible fatigue crack paths. Some case studies of fatigue crack paths in metallic materials are included. (C) 2016 Elsevier Ltd. All rights reserved.

关键词： linear elastic analysis Stress intensity factors Corner point singularities Crack paths Finite element analysis

来源：评论

学校读者我要写书评

暂无评论

The linear elastic analysis of cracked bodies and crack paths

引用

THEORETICAL AND APPLIED FRACTURE MECHANICS 2015年 79卷 34-50页

作者： Pook, L. P. 21 Woodside Rd Sevenoaks TN13 3HF England

The linear elastic analysis of cracked bodies is a Twentieth Century development, with the first papers appearing in 1907, but it was not until the introduction of the stress intensity factor concept in 1957 that widespread application to practical engineering problems became possible. linear elastic fracture mechanics (LEFM) developed rapidly in the 1960s, with application to brittle fracture and fatigue crack growth. The first application of finite elements to the calculation of stress intensity factors for two dimensional cases was in 1969. Finite element analysis had a significant influence on the development of LEFM. Corner point singularities were investigated in the late 1970s. It was soon found that the existence of corner point effects made interpretation of calculated stress intensity factors difficult and their validity questionable. In 1998 it was shown that the assumption that crack growth is in model leads to geometric constraints on permissible fatigue crack paths. Current open questions are. The need for a new field parameter, probably a singularity, to describe the stresses at surfaces. The use of strain energy density is promising. Adequate description of fatigue crack path stability. How best to allow for the influence of corner point singularities in three dimensional numerical predictions of fatigue crack paths. Development of an adequate plane strain fracture toughness testing standard. Some background information is given in appendices. (C) 2015 Elsevier Ltd. All rights reserved.

关键词： linear elastic analysis Stress intensity factor Corner point singularity Crack path Finite element analysis

来源：评论

学校读者我要写书评

暂无评论

Crack paths and the linear elastic analysis of cracked bodies

引用

FRATTURA ED INTEGRITA STRUTTURALE 2015年第34期9卷 150-159页

作者： Pook, L. P. 21 Woodside Road Sevenoaks TN13 3HF United Kingdom

The linear elastic analysis of cracked bodies is a Twentieth Century development, with the first papers appearing in 1907, but it was not until the introduction of the stress intensity factor concept in 1957 that widespread application to practical engineering problems became possible. linear elastic fracture mechanics (LEFM) developed rapidly in the 1960s, with application to brittle fracture and fatigue crack growth. The first application of finite elements to the calculation of stress intensity factors for two dimensional cases was in 1969. Finite element analysis had a significant influence on the development of LEFM. Corner point singularities were investigated in the late 1970s. It was soon found that the existence of corner point effects made interpretation of calculated stress intensity factors difficult and their validity questionable. In 1998 it was shown that the assumption that crack growth is in mode I leads to geometric constraints on permissible fatigue crack paths. Current open questions are. The need for a new field parameter, probably a singularity, to describe the stresses at surfaces. How best to allow for the influence of corner point singularities in three dimensional numerical predictions of fatigue crack paths. Adequate description of fatigue crack path stability.

关键词： linear elastic analysis Stress intensity factors Corner point singularities Crack paths Finite element analysis

来源：评论

学校读者我要写书评

暂无评论

Analytical linear elastic analysis of lateral buckling of "short" pipelines

Analytical linear elastic analysis of lateral buckling of "s...

引用

15th International Offshore and Polar Engineering Conference (ISOPE 2005)

作者： Christensen, L INTEC Engn Perth WA Australia

ISBN: (纸本)1880653648

This paper gives a definition of a "short" pipeline and derives the analytical linear elastic equations governing the lateral buckling problem for "short" perfectly straight pipelines exposed to high temperature and pressure loading. It is shown that these new equations are less conservative for "short" pipelines than the equations for "very long" pipelines normally used in lateral buckling screening studies. The use of the equations is illustrated through an example.

关键词： lateral buckling short pipeline linear elastic analysis snaking decaying force model

来源：评论

学校读者我要写书评

暂无评论

linear elastic isoparametric spline finite strip analysis of perforated thin-walled structures

引用

THIN-WALLED STRUCTURES 2008年第3期46卷 242-260页

作者： Eccher, G. Rasmussen, K. J. R. Zandonini, R. Univ Sydney Sch Civil Engn Sydney NSW 2006 Australia Univ Trent Fac Engn Dept Mech & Struct Engn I-38100 Trento Italy

This paper describes the application of the isoparametric spline finite strip method to the linear elastic analysis of tri-dimensional perforated folded plate structures. The general theory of the isoparametric spline finite strip method is introduced. Kinematics assumptions and the procedure for combining in-plane (membrane) and bending effects are set out. Particular attention is paid to the procedure for rotating the stiffness matrix and load vector from local to global coordinates. The reliability of the method is demonstrated by comparisons with finely meshed finite element analysis results. Square stiffened perforated plates in compression and bending are analysed. (c) 2007 Elsevier Ltd. All rights reserved.

关键词： folded plate linear elastic analysis isoparametric spline finite strip method perforations thin-walled elements

来源：评论

学校读者我要写书评

暂无评论

Exploring cracking resistance in modified asphalt mixtures through a comparative assessment of mechanical behavior and performance screening indicators

引用

CONSTRUCTION AND BUILDING MATERIALS 2025年 464卷

作者： Seitllari, Aksel Virginia Mil Inst 413 Letcher Ave Lexington VA 24450 USA

Fatigue cracking is a prevalent distress, affecting the service life of asphalt pavements. Traditional methods for assessing fatigue resistance can be complex and time-consuming, making it essential to implement more proactive approaches during the mix design and/or quality control process. Screening tests, such as the semi-circular bending (SCB) test with the Illinois flexibility index (FI) variant, have gained traction as a viable alternative. Despite its potential, the FI is often shown to exhibit high variability and lacks sensitivity to certain mix design variables. These limitations have prompted alternative data analysis methodologies and performance indices to evaluate the cracking potential of asphalt concrete. This study presents a comprehensive evaluation of cracking resistance derived from the SCB test results, where multiple performance indicators, including fracture energy (Gf), flexibility index (FI), cracking resistance index (CRI), toughness index (TI), fracture strain tolerance (FST), and Nflex factor, were adopted. Four polymer- modified, dense-graded asphalt mixtures, varying in aggregate types, gradations, and design gyrations, were tested. The efficacy of selected performance criteria to capture the cracking susceptibility of asphalt mixtures, focusing on consistency and reliability, was assessed. While useful for screening exercises, monotonic tests and associated performance indices often overlook critical behaviors, such as stress relaxation, highlighting the need for methods like cyclic loading tests and viscoelastic modeling to improve performance predictions of asphalt mixtures. Consequently, a comparative approach was initiated by benchmarking the results obtained against established fatigue characterization methods like the uniaxial tension/compression (T/C) fatigue test and viscoelastic continuum damage (VECD) analysis in a controlled laboratory environment. Results revealed varying degrees of correlation between SCB-based indicators a

关键词： Cracking resistance Fatigue assessment Performance indices Modified asphalt mixtures Viscoelastic continnum damage linear elastic analysis

来源：评论

学校读者我要写书评

暂无评论

elastic analysis of hybrid bonded joints and bonded composite repairs

引用

COMPOSITE STRUCTURES 2008年第4期82卷 563-576页

作者： Romilly, D. P. Clark, R. J. Univ British Columbia Dept Mech Engn Vancouver BC V6T 1Z4 Canada

The authors extend the closed-form bonded joint linear elastic analysis method of Delale et al. [Delale F, Erdogan F, Aydinoglu MN. Stresses in adhesively bonded joints: a closed-form solution. J Compos Mater 198 1;15:249-71] and Bigwood and Crocrombie [Bigwood DA, Crocombe AD. elastic analysis and engineering design formulae for bonded joints. Int J Adhes Adhes 1989;9(4):229-42] to include the composite deformation mechanisms and the thermal residual strains that arise in hybrid metal-composite joints such as those presented by bonded composite repairs applied to metallic aircraft structures. The analytical predictions for the adhesive stresses and the compliance are compared to the results of a linear elastic finite element model that has itself been validated by comparison with experimental results. The results are applied to the problem of coupled linear extension and bending of a bonded composite repair applied to a cracked aluminum substrate. The resulting stress intensity factor and crack-opening displacement in the repaired plate are compared to the results of a three-dimensional finite element analysis, and also exhibit excellent results. Throughout the text, observations are made regarding the practical application of the results to failure prediction in hybrid joints, whereby the authors demonstrate the need for consistency in the analytical methods used to determine the fatigue and failure of composites from the coupon level to the analysis of the final structural details. (c) 2007 Elsevier Ltd. All rights reserved.

关键词： hybrid bonded joint linear elastic analysis bonded composite repair

来源：评论

学校读者我要写书评

暂无评论

In-Situ Plate Load Test Measurements of Stress Distribution Properties for Coarse Unbound Granular Materials

引用

Transportation Geotechnics 2025年 52卷

作者： Hannasvik, Lisa Tronhuus Mork, Helge Evensen, Ragnar Johansen, Johnny M. Hoff, Inge Kierstein, René Department of Civil and Environmental Engineering Norwegian University of Science and Technology Trondheim 7491 Norway ViaNova Trondheim AS Trondheim 7037 Norway Veidekke Entreprenør AS Oslo 0278 Norway ViaNova AS Sandvika 1337 Norway

A field test was conducted to study in-situ stress distribution of coarse crushed rock (CR) materials. The existing literature on CR materials with upper sieve size > 90 mm is very limited, and there is a need to characterize these materials and validate the application of existing theory and models for unbound granular materials. The objective of this paper is to compare plate loading test (PLT) measurements on two CR subbase materials, and to analyze and compare computed and measured vertical stresses below subbase layers of these materials: open-graded CR 22/125 mm and dense-graded CR 0/125 mm. Earth pressure cells (EPCs) were installed to measure vertical stress at 0.6 m depth, σ_0.6, during static PLTs with 300 mm plate diameter. The ratio of σ_0.6 to the average stress at the surface, σ₀, was compared with outputs from Boussinesq's theory and multilayer nonlinear analyses in KENPAVE. The average σ_0.6 for all loading levels during the second cycle of PLT was 41% higher for CR 22/125 as compared to CR 0/125. The average ratio Δσ_0.6/Δσ₀ for EPC measurements were 12.4% and 9.7% for CR 22/125 and CR 0/125, respectively. Based on Boussinesq's theory, Δσ_0.6/Δσ₀ was 8.7%. Computed with KENPAVE, the average Δσ_0.6/Δσ₀ was 5.4% for both sections. The EPC measurements indicate better load distribution properties for dense-graded as compared to open-graded CR. These findings could be applied for empiric design systems by differentiating the load distribution parameters of such materials. Furthermore, the results indicate a need to validate the application of analytical or mechanistic-empirical pavement design tools for pavement structures comprising coarse CR materials. © 2025

关键词： Coarse unbound granular materials Dense-graded aggregates Earth pressure cell linear elastic analysis Load distribution Nonlinear elastic analysis Open-graded aggregates

来源：评论

学校读者我要写书评

暂无评论

An accurate and efficient scheme for linear and nonlinear analyses based on a gradient-weighted technique

引用

INTERNATIONAL JOURNAL OF NON-linear MECHANICS 2018年 105卷 9-19页

作者： Liu, Pengwei Cui, Xiangyang Wang, Gang Wang, Zhuo Chen, Lei Hunan Univ State Key Lab Adv Design & Mfg Vehicle Body Changsha 410082 Hunan Peoples R China Mississippi State Univ Dept Mech Engn Mississippi State MS 39762 USA Hebei Univ Technol Sch Mech Engn Tianjin 300130 Peoples R China

An accurate and efficient gradient weighted finite element method (GW-FEM) is developed for linear elastic, free vibration and material nonlinear analyses. The new approach is based on the triangular and tetrahedral elements that can be generated automatically for any complicated geometries in 2D and 3D spaces. Shepard interpolation technique (SIT) is used to formulate the weighted gradient field considering the effect of the element itself and its adjacent elements sharing common edges (2D) or faces (3D). Due to the simple formulations, the SIT is easily implemented and coded in constructing the weighted gradient field. Both of the linear elastic and work hardening-based elastic-plastic material models are incorporated in the GW-FEM for the linear and nonlinear analyses. The GW-FEM is then coupled with the total strain theory and projection method to solve the nonlinear elastic-plastic problem. Our numerical examples, including both of benchmark and practical engineering cases, reveal that GW-FEM provides superior performance in accuracy and efficiency, compared to the standard finite element method.

关键词： Gradient-weighted technique Finite element method linear elastic analysis Free vibration analysis elastic-plastic analysis

来源：评论

学校读者我要写书评

暂无评论

A 3D computational model of RC beam using lower order elements with enhanced strain approach in the elastic range

引用

CMC-COMPUTERS MATERIALS & CONTINUA 2008年第1期8卷 43-52页

作者： Samanta, Amiya K. Ghosh, Somnath NIT Dept Civil Engn Durgapur 713209 WB India Jadavpur Univ Dept Civil Engn Kolkata 70032 WB India

A procedure has been described to carry out three-dimensional elastic analysis of reinforced concrete beam employing finite element technique, which uses lower order elements. The proposed procedure utilizes 8-noded isometric solid /hexahedral elements HCiS18 with enhanced assumed strain (EAS) formulation, recently developed in the literature, to predict load-deformation and internal stresses produced in case of a simply supported RC beams in the elastic regime. It models the composite behaviour of concrete and reinforcements in rigid /perfect bond situation and their mutual interaction in bondslip condition considering continuous interface elements at the material level. Although, bond-slip relation are very much non-linear in behaviour even at the beginning of the loading condition, predictions from the proposed model /procedure are found to be very close to the experimental observations as far as accuracy is concerned in the elastic range. The sole purpose of this paper is to demonstrate the general applicability and to explore the potentiality of using lower order solid elements in the 3D finite element analysis with an aim of developing a general analytical method for the study of reinforced concrete beam in the elastic range.

关键词： lower order elements finite element approach three-dimensional enhanced assumed strain perfect bond bond-slip linear elastic analysis RC beam

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：